Another MS conversion, Progress, at last. Options

[JimN73]

I've been talking to McMark for some time about the MS/ignition upgrade. I decided to to take the plunge a few weeks ago and asked Mark to put it on his schedule.

Jeff (JSConst) had bought a kit from Mark and decided not to use it, so I bought it from him. All of the pieces are together and Mark has time starting on Sunday.

Unfortunately, my time is limited so I may not participate much. I will add updates as I learn of them, or Mark may do that if he has the time.

[904svo]

I was running a web 86B cam in a 2ltr engine. What I found was MAF works best
using MAP the vacumn signature was not stable enought. I try TPS, this was unstable
also. I try MAF+TPS next this was better but not good enought for me. I then change
to MAF the engine ran great, smooth idle and pull like a dream through the entire
RPM range. Try it I'm sure you will like it better. Just my $.02

[cgnj]

I was running a web 86B cam in a 2ltr engine. What I found was MAF works best
using MAP the vacumn signature was not stable enought. I try TPS, this was unstable
also. I try MAF+TPS next this was better but not good enought for me. I then change
to MAF the engine ran great, smooth idle and pull like a dream through the entire
RPM range. Try it I'm sure you will like it better. Just my $.02

Now it's question time.
What MAF did you use?
Did you switch to mod the plenum or relocate or use non standand aircleaner?
Pics would help.
I found this link on the a bmw forum. He went from itb's to MAF on a 2.2 motor. I really didn't study his cam, but I believe it has a duration of 304 degrees. I think that a MAF implementation of MS is the answer and will allow the use of non FI cams.

Link here bmw 2.2 with MAF

Problem is getting maf tables/curves. I am making a trip to Junkyard Barbie linkywith my dial caliper and MAF pn list. I'm going to pull Bosch MAFs from this techsheet Bosch hfm2 MAF and a maf from a mustang. the mustang MAF has a table that I was able to locate. Mustang MAF Table

That's my story and I'm sticking to it.

Carlos

[rwilner]

Have you guys tried to run in tps only? Mps only?

When the car bucks, is it under load or not?

My approach would be to try to narrow down the problem. Set the ms to tps only. Still bucking? Set it to mps only. Still bucking? If yes to one but not the other, issue is probably the sensor or wiring.

Is the bucking only under load? That could be a fuel issue, possibly related to your afr/ve tables. Have you tried running auto tune in closed loop within tunerstudio? That worked awesome for me. If youre going to run closed loop on afrs, try to verify your afr sniffer's readings against a known good instrument Like you'd do on a dyno-- mark must have one or have access to one.

I'm sure mark has done this, but make sure to post questions with msq files and catalogs on the microsquirt forums. The turnaround time there isn't super fast but the company owner (grippo) will help you troubleshoot.

Don't give up. You will get there!!!