QUOTE(914_teener @ Jun 27 2012, 09:11 PM)
QUOTE(pbanders @ Jun 25 2012, 09:07 PM)
Very interesting. I'll order one, soon, and I'll update my page with the info on the kit. I get hits from round the world, from D-Jet owners far outside of the 914 community, so I may be able to drum up considerable interest (e.g. Volvo, M-B, Citroen, etc.). As for calibration, hate to tell you, but using either an LCR meter or a bench tester (like an EFI Associates tester) is the only way I know how to reliably set up an MPS. Too many variables to using a mechanical method (with a vernier depth gauge).
My plan is to install a wide band sensor... so is there anyway to get it close first Chris and then adjust on the road or perhaps on a dyno?
Right now I have a rebuilt unit...but I know it is running lean on part to full load. Goal is to change out to the kit and see what happens and then tune to the AFR gauge with the kit.
Does this make sense given what Brad has said?
Brads writing on the subject has been a great help to me in getting my car running well (thanks Brad!)!
I have access to a LCR and setup a MPS per his settings adjusted for my altitude (sea level).
The problem is that the factory settings are way too lean.
I have confirmed this on another 914 as well.
My theory is that cars were already set on "lean kill" from the factory to meet 70's emmisions with the technology they had.
Add to that 10% ethanol and a free flowing exhaust (both my car and the other car have Bursch exhausts) and you have a very lean running car (solid white plugs and inside the exhaust header) that bucks on the factory settings.
So an LCR just gives you a place to start IMO/experience.
I have not yet added a wide band sensor, but that is the real solution.
If that is not in your immediate future, I would have one set with an LCR and then turn the center screw out (richer) until it runs better.
To do this easily you really need to drill the full throttle stop so that you do not lose that adjustment evertime you want to adjust the mixture.
I believe both my and the other car are about 2 turns out on the center screw only.
Start with 1/2 turn at a time until you are getting closer, then go 1/4 turn until there is almost no bucking at anything other than very light throttle, then go 1/8 turn or less until you are happy.
You should find that the idle mixture adjusting knob on the box is close to the middle of the adjustment range.
If you think your car is rich, I would not recommend leaning it out without a wide band sensor in place!
I have put about 9000 miles on my car since adjusting this way and it always starts and gets decent mileage.