Redneck Perfect Pass

Kristof - i don't think anyone did master audiovox-GPS combo. I'd like to hear otherwise.


mParsons - Thanks for reply!
I generally say - nah, how could it fail:)
But this time, with boat, where I am on the rope and can't even be heard - I decided to stick wtih limiter, vs rev-upper mechanism.

I spent some time figuring out if I can use Audiovox like sytem, honestly. but decided to give myself a bit more challenge - What can there be so complex in actual Perfect pass that can not be reproduced??

Getting my factory made PCB today, expect udpate in blog;)
ps sent you email, hope you got it


To All - any one can advise an IC that can be used for RPM measurement? I invision an IC that constantly measures time between pulses, and outputs that time via several pins (prefer not to use any data bus). I'm looking to offload this routine from my CPU, and hopefully increase accuracy too. best I can get is 0.5% error cycle to cycle so far.

Nice work! I might be interested in testing one out for you on my Nautique Super Sport. You don't see any reason it wouldn't work with EFI do you?

Stunt Driver wrote: With my limited knowledge about engine names - that EFI has a carbuerator that is controlled by rod, pulling on it to throttle up? Then it should work, i'm excited to learn how it behaves! Can you shoot me a picture of where throttle cable/rod connects to carb at couple angles? Wouild like to evaluate how much space exists for the servo installation. That is the least figured out part when it comes to production.

There is no carb, its multiport fuel injection. But there is a traditional throttle cable just like with a carbed motor. I think there should be room for the servo, I know the perfect pass servo fits on other 502 Pythons. I will get you some pics though.

Shawn

I have wakeboarded with speed controlled by my homebrew SteadyPass - and it prooved to be PERFECT!
Working to enable two more DIYers with this kit now, to extend testing, but expect nothing but success.
Here is raw screen of my device during RPM and then Speed modes youtube

Impressive

Hello Aengenend!

legally speaking, that stepper+cable solutin is patented. Since i want to offer something for a light DIY-able person to have - I'd rather stay away from that.
HOWEVER - if one wants to make one himself, and use for personal matters, and maybe even share detailed drawings here? That shoudln't be of any issue!

Control principle is same as mine, but programming would be very different. Interesting idea to try.   I can help with programming, if you are ready to work on cabled actuator solution itself. My head unit electrically has no problem to control it.

Update on my project - I am building two kits for two early responders from this forum right now, out of 3 PCBs that I have originally ordered.   One servo with hand made bracket already installe dand fitted well.   Hope to have usefull feedback of real world use (beyond my personal) in august!
Then will order more PCBs with updates, create 3D model of bracket for CNC, and roll out a dozen kits.
Cost is still looking arond $200. Allthou having to go to more expensive precise servo, and possibly pay for CNCing mounting brackets may push it $20-40. We'll see.

What do people think about having code as Open Source?   Some basic C++ programming skill is required, but far not at expert level, to be able to customize features and screen contents. Would this be interesting ?


ps - I did master RPM signal clean up finally. :)

So I made a drawing of what I'd like to use:

A: Link from throttle linkage to outside of bowden cable.
B: Link from OEM throttle cable to inside of bowden cable.

Good news - first test unit is out in the wild. RPM/GPS works. Servo ramains bit of a problem - cheap unit works but nto precise enough. Looking for next step up.

My plans (limited by time and funds available) are starting to firm up.

During 2015 i will be able to roll out very limited number of head units, only targeting mechanically inclided people, preferable with CNC access - since servo side remains in design. Cheap and cheerfull unit didn't work as i hoped.

In 2016 i should be able to improve design enough for it to become a real product, wtih all parts in a kit, in a shiny box:) and most important - with warranty. Still way below price of perfect pass, but with all the upgrades and expensive servo - not at $200 unfortunately.

Feedback that I hear - suggests fine unit with warranty is preferred over garage made fix it yourself approach. But topic is open for discussion!