Boats For Sale:
1998 Nautique Straight Pipe |
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1998Nautique 
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Joined: January-26-2006 Location: Canada Status: Offline Points: 190 |
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 Topic: 1998 Nautique Straight PipePosted: June-18-2008 at 8:57pm |
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I have a 1998 Nautique GT-40 EFI, has anyone ever put straight pipe on them. Or has an idea how to do it? Any advice is greatly appreciated. Would it sound good coming out a single exhaust pipe.
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BuffaloBFN
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Joined: June-24-2007 Location: Gainesville,GA Status: Offline Points: 6094 |
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Posted: June-19-2008 at 12:42am |
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There's some guy here who calls himself TRBenj...I think he found a solution?!!?
As I understand it, this was a single exhaust. 
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jbear
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Joined: January-21-2005 Location: Lake Wales FL. Status: Offline Points: 8193 |
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Posted: June-19-2008 at 12:44am |
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Man that is a beautiful job...ain't it?
john |
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"Loud pipes save lives"
AdamT sez "I'm Canadian and a beaver lover myself"... |
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BuffaloBFN
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Joined: June-24-2007 Location: Gainesville,GA Status: Offline Points: 6094 |
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Posted: June-19-2008 at 12:51am |
Ya Mon! |
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jbear
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Joined: January-21-2005 Location: Lake Wales FL. Status: Offline Points: 8193 |
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Posted: June-19-2008 at 12:53am |
Leftover from the honeymoon!? john |
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"Loud pipes save lives"
AdamT sez "I'm Canadian and a beaver lover myself"... |
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87BFN owner
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Joined: August-25-2006 Location: Ypsilanti, MI Status: Offline Points: 2194 |
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Posted: June-19-2008 at 2:53pm |
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If your going to do the work just go duals like Tim did. This is the back of the boat that was shown above.
TRBenj duals |
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TRBenj
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Joined: June-29-2005 Location: NWCT Status: Offline Points: 21113 |
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Posted: June-19-2008 at 4:18pm |
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Thanks guys.
Im not sure I would recommend the dual exhaust conversion... Its by no means a small undertaking- the cost and time involved are pretty significant. |
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STANG KILLA SS
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Joined: June-15-2008 Status: Offline Points: 81 |
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Posted: June-19-2008 at 6:02pm |
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one thing to consider, any time you remove the mufflers, the loss in backpressure will cause a loss in low end torque.
with the bullet mufflers used on these boats though the loss will be much less than on a car. |
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TRBenj
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Joined: June-29-2005 Location: NWCT Status: Offline Points: 21113 |
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Posted: June-19-2008 at 6:15pm |
Not only are the stock mufflers fairly lossless, but prop slippage makes low end torque almost a non-issue. Any Correct Craft should be getting an instant 2500+ RPM when going WOT out of the hole. Modified boats will see more than that, and 1.23 boats should see 3k. Modified 1.23 boats can get 3200-3400, depending on the prop. |
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Hollywood
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Joined: February-04-2004 Location: Twin Lakes, WI Status: Offline Points: 13511 |
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Posted: June-19-2008 at 6:19pm |
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what are you talking about
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nates78ski
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Joined: January-24-2005 Location: United States Status: Offline Points: 1041 |
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Posted: June-20-2008 at 12:19am |
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I get a boner every time I see that exhaust...is that normal?
Nate |
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adamt
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Joined: July-18-2007 Location: Orlando, FL Status: Offline Points: 927 |
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Posted: June-20-2008 at 1:26am |
I hear HW suffers from that same problem, but a little more often !!! |
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-Adam
1973 Skier |
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jbear
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Joined: January-21-2005 Location: Lake Wales FL. Status: Offline Points: 8193 |
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Posted: June-20-2008 at 1:40am |
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HW is young enough to have that problem often.
john |
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"Loud pipes save lives"
AdamT sez "I'm Canadian and a beaver lover myself"... |
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Hollywood
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Joined: February-04-2004 Location: Twin Lakes, WI Status: Offline Points: 13511 |
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Posted: June-20-2008 at 11:44am |
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Adam is just jealous.
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1998Nautique
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Joined: January-26-2006 Location: Canada Status: Offline Points: 190 |
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Posted: June-21-2008 at 3:53pm |
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Any ideas on how to run it straight. Where do I get the Y Pipe and hose to bypass the muffler?
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boat dr
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Joined: June-27-2004 Location: United States Status: Offline Points: 4245 |
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Posted: June-21-2008 at 5:57pm |
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Go to your local muffler shop armed with a pocket full of C notes and ask can they do the job?????????
If they fail your question and answer session go to the next one down the street, someone will take your money............ |
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SNobsessed
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Joined: October-21-2007 Location: IA Status: Offline Points: 7102 |
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Posted: June-22-2008 at 10:13am |
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1998N - I am also thinking of changing to a straight pipe setup, since I am going to install a 'Fresh Air Exhaust' to eliminate CO exposure (a significant issue) while surfing.
Thus now I will effectively have 2 mufflers. I saw these components on JA Chamberlain's site & am headed that direction. elbows I would run exhaust hose from the starboard manifold to an elbow, then hose from the port manifold down to a tee (next in inline). Guys, do you think this would work or create uneven backpressure for one of the banks? Would incresed intake manifold vacuum (at mid range RPM) be a good indcator of performance benefit? |
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“Beer is proof that God loves us and wants us to be happy.”
Ben Franklin |
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eric lavine
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Joined: August-13-2006 Location: United States Status: Offline Points: 13413 |
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Posted: June-22-2008 at 11:28am |
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he gets a boner and about 12.5 seconds later its gone lol
anyone have crossover pipe in thier exhasust? |
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JoeinNY
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Joined: October-19-2005 Location: United States Status: Offline Points: 5693 |
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Posted: June-22-2008 at 11:33am |
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I have plans for an x pipe, but its not high on the priority list..
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eric lavine
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Joined: August-13-2006 Location: United States Status: Offline Points: 13413 |
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Posted: June-22-2008 at 12:20pm |
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you ready for a trans yet? i could find you a nice zf630 a, full power forward and full power reverse, with electrics and a trolling valve for the no wake zone
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lewy2001
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Joined: March-19-2008 Location: NSW Australia Status: Offline Points: 2234 |
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Posted: June-22-2008 at 12:45pm |
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Love them hitech's. That is one nice clean install TRBenj.
It would be interesting to see if a crossover / balance pipe between the 2 banks produced any power gains. I found in my Aussie 5.4 litre V8 DOHC Ford ute . The best power curve & max HP was with a balance pipe straight after Cat's then into a single 3" pipe. Picture of Xovers 
I put the following balance pipe in my old ski boat and got better economy and a reduction in exhaust crackle also. 
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If you're going through hell, keep going
89 Ski <a href="http://www.correctcraftfan.com/diaries/details.asp?ID=5685" ta |
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TRBenj
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Joined: June-29-2005 Location: NWCT Status: Offline Points: 21113 |
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Posted: June-22-2008 at 5:00pm |
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Very interesting. Ill need to do some more reading- can you explain the benefits of an H pipe vs. an X pipe?
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azeus17
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Joined: August-19-2007 Location: Grand Rapids, M Status: Offline Points: 576 |
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Posted: June-22-2008 at 7:28pm |
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Lewy-
What is the pulley system for in the second picture? |
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Boats:
Current: 02 SANTE Sold: 89 Sport Nautique |
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lewy2001
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Joined: March-19-2008 Location: NSW Australia Status: Offline Points: 2234 |
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Posted: June-22-2008 at 11:15pm |
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TRBenj
I had no room room to put the xover type design in my old ski boat it was only 17'2" including platform so had to settle for the H pipe design. It is all about exhaust scavenging I would think the xover would have advantages but the H pipe design definately helped in my application. Azeus17 The pulley system is for the hand lever operated soft clutch transmission. It basically is a standard clutch & pressure plate system from a car. It uses a modified bell hosing with a bronze clutch fork that is actuated by a hand lever via the pulley system yon can see in the bilge. It is very common in fresh water boats in Aus. Mainly the budget priced boats use this system it is very reliable and inexpensive to repair. It is also a great improvement over the old dog clutch system earlier ski boats used. It does not suit salt water applications that well due to corrosion. |
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If you're going through hell, keep going
89 Ski <a href="http://www.correctcraftfan.com/diaries/details.asp?ID=5685" ta |
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Luchog
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Joined: April-17-2007 Location: Argentina Status: Offline Points: 2135 |
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Posted: June-23-2008 at 1:02am |
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what would be the benefits of the X exhaust besides having a cool steel X on the bilge???
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jbear
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Joined: January-21-2005 Location: Lake Wales FL. Status: Offline Points: 8193 |
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Posted: June-23-2008 at 1:05am |
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Thread jack..sorry...Luciano..was just gonna e-mail you as I hadn't seen you here for awhile. How is the resturant going? And your lady? Been doing much boarding?
Sorry again. john |
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"Loud pipes save lives"
AdamT sez "I'm Canadian and a beaver lover myself"... |
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lewy2001
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Joined: March-19-2008 Location: NSW Australia Status: Offline Points: 2234 |
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Posted: June-23-2008 at 11:36am |
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I was just reading though the original CC brochures on this site for my 89 Ski. Found some excellent info on the Interflow exhaust which they introduced in that year in the SP package. They claimed a 20% torque improvement with a 10% HP gain & a 6% fuel economy benefit. The only real downfall is the 50% reduction in noise!!!!
They are big gains but it was CC telling the story. I also found out that my 89 is Cranberry not Maroon. 
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If you're going through hell, keep going
89 Ski <a href="http://www.correctcraftfan.com/diaries/details.asp?ID=5685" ta |
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jbear wrote: