GT-40 Performance Upgrades Help
Printed From: CorrectCraftFan.com
Category: General Correct Craft Discussion
Forum Name: General Discussion
Forum Discription: Anything Correct Craft
URL: http://www.CorrectCraftFan.com/forum/forum_posts.asp?TID=37969
Printed Date: April-28-2024 at 10:09pm
Topic: GT-40 Performance Upgrades Help
Posted By: CI Restorations
Subject: GT-40 Performance Upgrades Help
Date Posted: January-14-2016 at 10:33am
| Does anyone know of a computer chip/injectors maybe combo package to add more power to 99 sport nautique 351 gt40? Thanks in advance! |
Replies:
Posted By: quinner
Date Posted: January-14-2016 at 11:32am
|
You may want to revise the thread title better indicating what you are seeking, perhaps something like "GT-40 Performance Upgrades Help". Lewy certainly comes to mind as one of our GT-40 Guru's, several others as well. ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=1143" rel="nofollow - Mi Bowt |
Posted By: CI Restorations
Date Posted: January-14-2016 at 3:32pm
| Thanks for input |
Posted By: Hollywood
Date Posted: January-14-2016 at 4:25pm
| Thought I saw around $100 that boosted like 50 hp. |
Posted By: 8122pbrainard
Date Posted: January-14-2016 at 6:01pm
$100? Would that be the "Reid" method of HP boosting with different HP decals on the engine?  ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Hollywood wrote:Posted By: lewy2001
Date Posted: January-14-2016 at 6:54pm
|
Mike I put together a Megasquirt ECM conversion for the GT40. I was planning on upgrading engine with a stroker crank at some stage. My original Ford EEC1V computer was also having intermittent heat soak problems. The injectors are large enough PCM used 24lb injectors most automotive applications of the 351W used 17lb injectors. The injectors would handle almost all the mods you could throw at a 351 cu. in. but maybe marginal if going to a stroker like the 408 cu. in. The Megasquirt ECM has increased the HP by a small margin .The standard fuel and ignition tables on the GT40 are fairly conservative and would handle mild performance modifications. Paul (Gun-Driver) added the better flowing GT40P heads to his GT40 with no problems. The real HP gains were planned with the engine mods crank, heads, cam etc. The ECM would then have been able to be tuned to gain the most from these mods without damaging the engine. Depends on what sort of gains you are after PCM put together a great package with the GT40 from the factory. ------------- If you're going through hell, keep going http://www.correctcraftfan.com/diaries/details.asp?ID=2999" rel="nofollow - 89 Ski <a href="http://www.correctcraftfan.com/diaries/details.asp?ID=5685" ta |
Posted By: CI Restorations
Date Posted: January-14-2016 at 8:34pm
| Thank you lewy looking more for bolt on mods or chip maybe and where I would get one? |
Posted By: 8122pbrainard
Date Posted: January-14-2016 at 8:43pm
|
Mike, Is this 99 sport your boat or a customers? How versed are you with the PCM's? ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Posted By: CI Restorations
Date Posted: January-15-2016 at 2:04am
|
Any clue where? |
Posted By: CI Restorations
Date Posted: January-15-2016 at 2:06am
| Any clue where you may have seen that |
Posted By: seacamper
Date Posted: January-15-2016 at 12:03pm
Hey Mike, Probably the easiest way to add a kick to any boat is not even talked about by most of the guys on this site. I buy these by the crate and just use them when the guys want to get a big barefoot line together: https://commons.wikimedia.org/wiki/File:JATO_Bottle.jpg" rel="nofollow - Performance Increase ------------- 1980 Ski Nautique Boat Bar 1988 Mastercraft Tristar Open Bow 1988 Mastercraft Tristar Closed Bow 1969 Seacamper Houseboat 1986 Harris Pontoon 2004 Seadoo GTX SC + Flydive Xboard 1999 Adventurecraft |
Posted By: JoeinNY
Date Posted: January-15-2016 at 12:11pm
|
Unfortunately there isn’t anything bolt on that is going to help you. PCM has gotten a fair amount of power out of that engine as is, and its not the same as the automotive in terms of it running open loop vs closed loop. None of the automotive chips would help you… and the marine gt40 market is not big enough that any aftermarket is going to support it from a computer side. If you want to scrap the fuel injection buy a carb and ignition system, then change the cam, intake, etc you can end up with more hp but it wont be easy or cheap. Sticking with the fuel injection requires a custom solution. ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=1477 - 1983 Ski Nautique 2001 1967 Mustang 302 "Decoy" http://www.youtube.com/watch?v=cO5MkcBXBBs - Holeshot Video |
Posted By: CI Restorations
Date Posted: January-15-2016 at 2:13pm
I dont want to lose injection so I guess Ill be waiting for the stroker 
|
Posted By: CI Restorations
Date Posted: January-15-2016 at 2:29pm
| Has anyone used or heard of Magnum smart tune boat performance module the "claim" 17% hp and tq increase???? |
Posted By: CI Restorations
Date Posted: January-15-2016 at 2:30pm
| http://www.magnumtuning.com/en/detail/smart-tune-x-boat-fuel-tuner-performance-module Anyone??? |
Posted By: 8122pbrainard
Date Posted: January-15-2016 at 2:54pm
Mike, http://www.magnumtuning.com/en/detail/smart-tune-x-boat-fuel-tuner-performance-module Anyone???%20" rel="nofollow - Here's a direct link to the Magnumtuning site. I haven't heard anything about them but maybe another member can comment. What were you referring to below?
Maybe you missed the question but I'm curious if this boat is yours or a customers? ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Posted By: CI Restorations
Date Posted: January-15-2016 at 5:15pm
|
I replyed may have came through as a comment but yes the boat is mine. |
Posted By: CI Restorations
Date Posted: January-16-2016 at 4:23am
| Where someone found a chil for it |
Posted By: Gary S
Date Posted: January-16-2016 at 10:04am
I question any company who would use scotch loc's in a marine environment ......... ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=1711&sort=&pagenum=1&yrstart=1966&yrend=1970" rel="nofollow - 69 Mustang HM SS 95 Nautique Super Sport |
Posted By: 8122pbrainard
Date Posted: January-16-2016 at 10:20am
WOW!! There's no question in my mind. This puts them at the very bottom of my list! Picture is from "marine performance chip"  I wonder if they would guarantee the Scotch Lock's for 10 years?  ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Posted By: t.franscioni
Date Posted: May-12-2017 at 9:46pm
|
[QUOTE=lewy2001] Mike I put together a Megasquirt ECM conversion for the GT40. I was planning on upgrading engine with a stroker crank at some stage. My original Ford EEC1V computer was also having intermittent heat soak problems. The injectors are large enough PCM used 24lb injectors most automotive applications of the 351W used 17lb injectors. The injectors would handle almost all the mods you could throw at a 351 cu. in. but maybe marginal if going to a stroker like the 408 cu. in. The Megasquirt ECM has increased the HP by a small margin .The standard fuel and ignition tables on the GT40 are fairly conservative and would handle mild performance modifications. Paul (Gun-Driver) added the better flowing GT40P heads to his GT40 with no problems. Lewy, curious about your experience tuning the Megasquirt for your GT40. Did you tune it yourself? If so can you touch on the equipment and sensors (any wideband O2 used somehow in the exhaust) you used to tune it? You mentioned the stock GT40 tuning tables being mild. How did you get a look at them and anyway you can share those tables? Thanks Tom |
Posted By: lewy2001
Date Posted: May-15-2017 at 2:03am
|
I ran the engine with the standard PCM ECU while using the Megasquirt logging feature with a wideband O2 sensor. I also logged the timing while running the standard PCM ECU. The wideband O2 sensor is stilling surviving in the wet exhaust environment after two seasons of use. I do not use the O2 sensor in closed loop mode it is just there for manual tuning purposes. The Megasquirt ECM is run just like the original PCM ECM in open loop mode. ------------- If you're going through hell, keep going http://www.correctcraftfan.com/diaries/details.asp?ID=2999" rel="nofollow - 89 Ski <a href="http://www.correctcraftfan.com/diaries/details.asp?ID=5685" ta |
Posted By: t.franscioni
Date Posted: May-15-2017 at 2:20am
| Cool. Where about in the exhaust system did you install the wideband O2? Do you have a pic of the install? |
Posted By: t.franscioni
Date Posted: May-15-2017 at 8:41am
|
Once you had mapped out the stock PCM fuel and timing tables how was it programming the megasquirt to replicate those tables you had logged? Which model megasquirt are you running and are you utilizing the stock engine harness? I see megasquirt make a plug n play EEC that has the Ford 60 pin connector so you could perhaps use the stock PCM engine harness with it. Any pics of the setup? |
Posted By: uk1979
Date Posted: May-16-2017 at 8:08am
Good work Mark  on a carb biased forum Guys the Scotchlock jell filled 314's and alike have worked well for me ------------- Lets have a go 56 Starflite 77 SN 78 SN 80 BFN |
Posted By: 63 Skier
Date Posted: May-16-2017 at 10:51am
They absolutely work, it's just that when you think about what they are doing, it's an unnatural act. Chopping part of your wire away to make a connection is about the 10th best way to do it. I would never use one in a boat application, I will admit I've snapped a few on trailer wiring just because I was in a hurry. ------------- '63 American Skier - '98 Sport Nautique |
Posted By: 8122pbrainard
Date Posted: May-16-2017 at 11:26am
Roger, I agree but the 314's are not what comes in the kit! Also, I value the guy who got his package after 100 years working on wires!!
------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Posted By: Gary S
Date Posted: May-16-2017 at 11:27am
|
I don't want to talk for Jbear but we must have used a million of them,they work in the proper use and sure beat the alternative. In Marks defense the picture of them above is not the megasquirt kit. In the telephone industry,before scotchloc's they would strip about 1" of insulation off a wire twist them together then slide a closed ended tube filled with some sort of grease over it. It relied on the grease to keep them on. Then they went to a connector called a " pumpkin seed" you'd do the same but they would crimp on,they were better because they didn't fall off as easy. ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=1711&sort=&pagenum=1&yrstart=1966&yrend=1970" rel="nofollow - 69 Mustang HM SS 95 Nautique Super Sport |
Posted By: t.franscioni
Date Posted: May-17-2017 at 3:18am
| Yad nabbit always happens when I come here to CCF for answers.... my questions lost in a sea of ensuing discussion about wire terminals and pumpkin seeds.... |
Posted By: Gary S
Date Posted: May-17-2017 at 9:35am
|
That's because on this site as opposed to the other site you frequent have actually met and hang out together. Why not PM Mark and ask him your questions? He only lives on the other side of the world and does not keep the same hours as we do. ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=1711&sort=&pagenum=1&yrstart=1966&yrend=1970" rel="nofollow - 69 Mustang HM SS 95 Nautique Super Sport |
Posted By: t.franscioni
Date Posted: May-17-2017 at 9:54am
|
Yes I get that. Just a little sarcasm on my part.
|
Posted By: 63 Skier
Date Posted: May-17-2017 at 2:24pm
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Hey Thomas, I've been reading on the other site as well, very interesting discussion even if a bit over my head. As a GT-40 owner I appreciate all the work to find solutions to the ECM support issue. Yes, we get a bit off track at times here, but it generally is something useful like an electric connector discussion, I've learned a ton on this site. I've been looking more and posting on the other site lately, enjoy it and it's a different group and different discussion so interesting to spend time on both. ------------- '63 American Skier - '98 Sport Nautique |
Posted By: t.franscioni
Date Posted: May-17-2017 at 3:17pm
| Agree 100% . CCF has a better sense of humor though in my opinion. |
Posted By: lewy2001
Date Posted: May-17-2017 at 10:26pm
|
Tom I used this kit but it previously came with a new ford connector. %20" rel="nofollow - https://www.diyautotune.com/product/diypnp-ford-60-pin-eec-iv-unassembled-kit-no-connector/ I have since moved the ECM up under the driver side dash panel. With an extension cable I manufactured. I think one of the reasons the original PCM GT40 ECM's are starting to fail on these engines besides age is the amount of heat cycles they have endured under the engine cover. I verified the logged ignition table at a few points with a timing light and then transferred those values straight into the Megasquirt ECM. The fuel table required quite a bit of trial and error. In fact I am still adjusting it, that is part of the fun. When Adam and Tim visited last year there was quite a few back to back barefoot runs that showed I was a bit too fat on the top end of my table. Previously I had hardly ever used that section of the fuel table. Being able to log and then re tune makes this a fun project that just keeps giving. Hey I may even add that stroker kit so i can start all over again. If you decide to go with the Megasquirt I can supply you with my tables. The block for the O2 sensor was the one Alan had made for his 81 when doing engine upgrades but never used. He kindly sent it all the way to Oz. I made up a elbow to get it further away from the wet exhaust if the O2 sensor failed but it has not been required yet.  ------------- If you're going through hell, keep going http://www.correctcraftfan.com/diaries/details.asp?ID=2999" rel="nofollow - 89 Ski <a href="http://www.correctcraftfan.com/diaries/details.asp?ID=5685" ta |
Posted By: t.franscioni
Date Posted: May-17-2017 at 10:51pm
| Very cool. Ya that's about 80% of the reason I want to do a megasquirt for my GT40... should provide for many future hours of tinkering time on the lake and in the shop. Note my email T.Franscioni@icloud.com if you could send me the tables or tuning file whatever you got that would be awesome. Iv never tuned an EFI system before so it would be nice to have some good info to load onto the megasquirt to get me going and then in meantime I can begin working on tinkering with data logging and making adjustments and experimenting for fun. |
Posted By: jbear
Date Posted: May-17-2017 at 11:30pm
yup...scotchlocs were the boss Gary....but they sure helped to cut down on our overtime! Had to laugh remembering the twist and the little cloth tube. Was cleaning out the attic getting ready to move and found a box of 1000 'beanies' or in your lingo...'pumpkin seeds. sorry Tom to be boring you........ john ------------- "Loud pipes save lives" AdamT sez "I'm Canadian and a beaver lover myself"... |
Posted By: t.franscioni
Date Posted: May-18-2017 at 1:41am
| No no go ahead....I'm just a groupie |
Posted By: Rlbarrasjr
Date Posted: August-02-2018 at 12:11am
| Lewy2001, sent you a pm... any info you have on your megasquirt setup would be appreciated. I'm considering the same conversation and maybe setting up closed loop scheme. rbarras@gmail.com |
Posted By: MrMcD
Date Posted: August-04-2018 at 8:04pm
|
This is an old thread but it started with someone looking for more power out of a 351W GT40 engine. I have not read anywhere on here of someone installing a set of AFR heads. There are some trick heads out there developed for the Mustang market but they out flow a GT40 by a fair amount. More flow = more HP potential. I saw a set of AFR 185 heads on Craigslist slightly used for $1,100 and I was tempted to try them but my GT 40 runs so well I am reluctant to play with it. I think they could run 40 HP stronger than the GT 40 heads. ------------- |
Posted By: Rlbarrasjr
Date Posted: August-08-2018 at 5:15pm
| I helped Thomas awhile back with testing the GT40 replacement computer options. I will be doing power adders at some point on my boat. I have done the research on the MEgaSquirt, but I'm also exchanging emails and working with the guys that support Ford EEC-IV Binary Editor and TunerPRO to get a definition file made to tune the factory PCM GT40 computer. I'll post any info I receive. |
Posted By: gun-driver
Date Posted: August-09-2018 at 10:56pm
|
If you can break the code and come up with a not super expensive way to add power to the GT-40 you will be a hero to a lot of people on here. I’ll be watching this one
|
Posted By: anm2254
Date Posted: August-18-2018 at 11:03am
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Are all GT40 heads the same? Can I use a Mustang/explorer set on my 86 Martinique? |
Posted By: Gary S
Date Posted: August-18-2018 at 12:48pm
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Yes all GT 40 heads are the same. Hard to find and usually costly due to 5.0 guys using them. Came on 5.8 Cobras,Lightening trucks, and of course GT40 boat engines. GT 40 p's came on 5.0 Explorer's and Mountaineer's are more common. Exhaust manifold fitment issues on cars but no troubles on marine. You would need brass freeze plugs installed and the head bolts drilled out to 1/2". Actually marginally out flow GT 40's and are the best stock production Ford heads. ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=1711&sort=&pagenum=1&yrstart=1966&yrend=1970" rel="nofollow - 69 Mustang HM SS 95 Nautique Super Sport |
Posted By: Rlbarrasjr
Date Posted: October-28-2018 at 7:02pm
It is done!!! Core Tuning compiled a definition file for the 300m marine gt-40 using their Binary Editor Software. I was emailing Clint and Ben for months to get it ready. This can also be used on earlier e290 ecus. I just got it loaded. Going to do some test using the QuarterHorse Chip in the coming weeks. The definition is MCSR1. There are way more parameters defined than what i expected. see screen shot. It is supposed to be able to datalog too. 
|
Posted By: gt40KS
Date Posted: October-30-2018 at 7:22pm
Awesome! Let us know how things progress. Seems it's been a good year for current GT-40 owners  ------------- JCCI 1995 Ski Nautique GT40 |
Posted By: DHMcFadin
Date Posted: June-25-2019 at 9:58pm
|
Any updates to the GT40 Performance Upgrade? ------------- 1999 Longhorn Nautique 1995 Nautique Super Sport https://www.instagram.com/longhorn_nautique/" rel="nofollow - https://www.instagram.com/longhorn_nautique/ |
Posted By: Rlbarrasjr
Date Posted: June-25-2019 at 10:46pm
|
it all works. Get a quarterhorse package from coretuning.. http://www.coretuning.net/ Email Clint first (Clint@eecanalyzer.net) before buying to make sure he knows you need the MCSR1 definition file. remember this is all DIY tuning. If you need help with the actual tuning itself for whatever mods you made i recommend reaching out to Adam at pops racing or Mike with efidynotuning. http://www.popsracing.com/services.html http://www.efidynotuning.com/ |
Posted By: t.franscioni
Date Posted: June-26-2019 at 10:04pm
|
Rusty Using that MCSR1 strategy you can view BOTH the 300M and E290 tune? Or is this MCSR1 just for the 300M? Out of curiosity I’d sure like to compare and contrast the two tunes and see what changes PCM made. |
Posted By: gun-driver
Date Posted: June-26-2019 at 11:02pm
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Did this upgrade just allow you to get a dead ECU running or are you putting more ponies to the water with the tune? |
Posted By: Rlbarrasjr
Date Posted: June-26-2019 at 11:09pm
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yes.. the MCSR1 strategy will open both calibrations, but i wouldnt use e290 at all. the 300m seems to be a more mature calibration. Biggest thing to notice it that they drop some spark and richen up the upper rpm range. they made some adjustments to lower/smooth idle too.    
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Posted By: Rlbarrasjr
Date Posted: June-26-2019 at 11:15pm
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here a google sheet to all the differences https://docs.google.com/spreadsheets/d/1U3fmH4CpZZruHfRYuz6SNfSReoY2ZpM-O8wOg5WmV6M/edit?usp=sharing |
Posted By: Rlbarrasjr
Date Posted: June-26-2019 at 11:21pm
both! sort of. the dead ecu replacement with the chips that places are selling are taking this same family of hardware and loading a stock tune/calibration on it to get up and running. this software addition will let you manipulate/tune that stock calibration file for any performance upgrades you do. it also does datalogging. personally i plan to put a stroker rotating assembly in mine and i'll need to tune for it. |
Posted By: t.franscioni
Date Posted: June-26-2019 at 11:31pm
|
[QUOTE=Rlbarrasjr] yes.. the MCSR1 strategy will open both calibrations, but i wouldnt use e290 at all. the 300m seems to be a more mature calibration. Biggest thing to notice it that they drop some spark and richen up the upper rpm range. they made some adjustments to lower/smooth idle too. Very cool. Thanks for taking these next steps this will undoubtedly come in handy for people. I like your stroker plan. Make sure and do a write up of that mod. |
Posted By: gun-driver
Date Posted: June-27-2019 at 10:31pm
Personally I would go roller cam, roller rockers and a nice set of AFR heads then see how it tunes, that combo should put you close to the 400 ponies mark. |
Posted By: DHMcFadin
Date Posted: July-20-2019 at 4:13am
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Does any know what years pcm used the e290 and 300m calibrations? I have a 99 GT40 with the original ECM. ------------- 1999 Longhorn Nautique 1995 Nautique Super Sport https://www.instagram.com/longhorn_nautique/" rel="nofollow - https://www.instagram.com/longhorn_nautique/ |
Posted By: Gary S
Date Posted: July-20-2019 at 10:32am
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I have a engine with 1998 date codes on some components - it has the 300 tune. ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=1711&sort=&pagenum=1&yrstart=1966&yrend=1970" rel="nofollow - 69 Mustang HM SS 95 Nautique Super Sport |
Posted By: t.franscioni
Date Posted: July-20-2019 at 11:19am
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Talking to people and helping program chips these are the years/tune revisions Iv come up with. Correct me if I’m wrong. 95- 58HO tune 96- 290M tune 97-some 98- E290 tune Some 98-2002- 300M tune |
Posted By: KENO
Date Posted: July-20-2019 at 12:07pm
If you read the sticker on your ECM you'll know what you have for sure Here's a picture of a sticker 
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Posted By: Gary S
Date Posted: July-20-2019 at 12:15pm
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Tom my May of 95 SS has the 290 in it ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=1711&sort=&pagenum=1&yrstart=1966&yrend=1970" rel="nofollow - 69 Mustang HM SS 95 Nautique Super Sport |
Posted By: DHMcFadin
Date Posted: July-20-2019 at 7:55pm
Thank you! I appreciate the picture!
------------- 1999 Longhorn Nautique 1995 Nautique Super Sport https://www.instagram.com/longhorn_nautique/" rel="nofollow - https://www.instagram.com/longhorn_nautique/ |
Posted By: Rlbarrasjr
Date Posted: July-20-2019 at 7:58pm
| My understanding from everything I've been through is that 300M is a better tune and can be used on the older models and benefit. |
Posted By: DHMcFadin
Date Posted: July-20-2019 at 8:01pm
|
Does the 300m give the engine a little more umph? ------------- 1999 Longhorn Nautique 1995 Nautique Super Sport https://www.instagram.com/longhorn_nautique/" rel="nofollow - https://www.instagram.com/longhorn_nautique/ |
Posted By: Rlbarrasjr
Date Posted: July-20-2019 at 8:06pm
| Best I can tell is it's a safer tune. A little richer and better idle. You probably won't notice any power difference |
Posted By: gt40KS
Date Posted: July-22-2019 at 12:07am
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Right now I'm running the computer I put together with the add on chip and the 300 tune. Most of the reason I opted to try this was the possibility of evening out the idle. I first ran the new engine on the 300, then for comparison switched back to its stock 290 computer. Honestly, I really couldn't tell any difference between the two and it really did nothing for the idle. I have switched back to the modified computer with the 300 tune but certainly not because of any perceptible performance gains. More because, as Rusty says it's supposed to be a better, upgraded tune which I took to mean the air/ fuel mix, timing and the like was more refined. Performance increase? No. Better fuel economy? Not that I can tell. Smoother, more consistent idle? Hard to say for me since I had what seems to be a host of problems causing idle issues. They appear to be solved now but was it at least partially due to the tune? Anybody's guess. ------------- JCCI 1995 Ski Nautique GT40 |
Posted By: lewy2001
Date Posted: July-22-2019 at 10:18pm
|
The GT40 uses batch fire injector firing and this likes a nice rich idle mixture. I spent many hours playing with idle mixture and timing on my Megasquirt DIY setup. Had always planned to change to sequential firing but have never got around to it maybe this year There is no power advantage with sequential fire injectors just a better idle. From memory when I went above 13:1 the idle was erratic around 12.5 to 12.8 seemed to produce the best idle with a bit more timing. If I get time I will bolt my O2 sensor and EEC1V back on and see what the difference there is in the 290 compared to the 300 tune. Maybe just send it all over to Keno he loves R & D ------------- If you're going through hell, keep going http://www.correctcraftfan.com/diaries/details.asp?ID=2999" rel="nofollow - 89 Ski <a href="http://www.correctcraftfan.com/diaries/details.asp?ID=5685" ta |
Posted By: KENO
Date Posted: July-23-2019 at 9:47am
Send it to Joe, we seem to do all our R&D on his boat
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Posted By: DHMcFadin
Date Posted: August-08-2019 at 1:59am
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Turns out I already have the 300m. Are there any other hardware upgrades I can make to this engine. I have seen threads throwing around 400 hp but there is no context. Is there anything else I can do to get the horsepower up? ------------- 1999 Longhorn Nautique 1995 Nautique Super Sport https://www.instagram.com/longhorn_nautique/" rel="nofollow - https://www.instagram.com/longhorn_nautique/ |