Genesis 80fi ECU options

[Jon Burford]

the plenum looks as if it shouldn't cause you any problems, I take it those two pipes coming of the runners are for the MAP sensors?

Running it N/A, so the standard exhaust would be a good place to start and the collector looks good.
It's good that you have been able to fit it in the car. The rear exhaust exit on the genesis engine is one of the things that makes it so nice for putting in a car.
I would be interested to know what goes on inside that box at the back though
It looks like you have been having a pretty tricky time of it with the workshop. I hope you can get it sorted and that the power commander gets it running nicely. I like the chain reduction too. It's similar to what we did.
If you can think of anything that I might be help you with; let me know.
It should be a good car, I will be watching out for you!

[tromoly]

Jon, thanks for the kind words, the car is slowly getting figured out. Will you by chance be at the Michigan competition?

The larger ports on the intake runners are for the fuel injectors, the 90-degree fittings are for the pressure hoses coming off of the intake runners. The same fittings were used on last year's car with the CBR and the exact same pressure sensors (odd 'cause ours are stock for the snowmobile), we're still a bit puzzled.

The box in the back is actually the muffler, the exhaust stinger points straight down at the ground about a half inch lower than the chassis in that area. Initial dB testing has us at 110.5 dB inside the garage, we have a couple things to try to make sound.

[Jon Burford]

Troy,
Sadly not, I'm from the UK and I have never been to an American Competition. Maybe next year... =]

I see, so you are using the snow mobile MAP sensors? I don't remember the position of the MAP sensors relative to the snowmobiles throttle plate, but I guess if they are working with the standard intake and not with your plenum, it's down to the pressure inside the plenum causing a reading that is outside what it thinks it should be getting and therefore isn't playing.
That is just speculation as I have no idea how the phazer's ECU works, but I can't really think of much else, especially if it claims it has a pressure problem.
Incidentally, what happens if you leave the MAP sensors connected electrically but don't connect them to the plenum, i.e. just block up those pipes on your plenum. See if it starts then. It's not a solution, but it might help figure out your problem.

Ours was on the limit of the noise regs too, although I used a stupidly small round exhaust can that I would make bigger if I was doing it again. Don't forget how they take the reading at the noise test, I forget the exact wording of the regulation, but I doubt having the outlet so close to the ground is going to be doing you any favours.

[Brian Barnhill]

Tromoly:

Might try moving the bung for the pressure sensor up into the body of the plenum (you could do just one tap and split it to the two sensors). The positioning in the stock throttle bodies was there due to the location of the butterfly. You might be getting some odd pressure readings in the runner since you have air moving around a bit. The air in the body of the plenum should be a bit more static/more stable.

When I got the genesis engine running we ran on the stock ecu, with the stock throttle body, then stock throttle body with a Haltech PS 2000, then restrictor/plenum with the haltech and a GM MAP sensor on a Speed-Density VE based map. I MAY be at Michigan this year if you guys are still having issues (depends on my brother's team finishing their car since/making it out)

As another note - the stock CVT will do ok, except for the secondary. WPI had issues with back-shifting and shift points in general. New weights were installed and Aaen Performance coated the clutch cam and did the preload/spring. Worked MUCH better after that. Before the install the car wouldn't backshift properly coming into a corner and would then accelerate poorly when you tried to get back on it again.

[Jon Burford]

yup, we used the stock cvt but with different primary/secondary springs, cam and fly weights, although our engagement was still far too low giving us lag coming out of really slow corners.

[Andrew Richards]

It has been a while since I dug up the stock throttle body setup to see if it has a throttle position sensor... but does it? My thought here being you could try unplugging the map sensor to put the ecu into a alpha n strategy. It would be very conservative with fueling especially for your application with the restrictor but it could be worked out. We are running a bosch motorsport MS3 on the genesis and it works really well however does require the addition of a custom trigger wheel on the crank.

[tromoly]

Sorry for the late reply, been busy with other things.

Turns out the most vacuum that could be pulled with the short runner length was 5inHg, a quarter of the 20inHg that the stock throttle body pulls. So, now neither of the engine team's intakes are going to be used because they don't work, and the car is running a cobbled together PVC intake built by members of frame team that, with some slight adjustment using circuitry and zener diodes, allows the engine to run. So to put it nicely, after 4 months of waiting on an intake and then having to build something else, most of the team is not happy with said engine team captain. Should be an interesting week next week.