1990mbt

iTrader: (1)

Ok I just got my car out for the year and decided i better get it tuned better. Problem im having is the car is jumpy and runs rough intermitently.

1990 miata(24k miles)
t25 tubro- intercooler
2.5" exhaust and no cat

MSPNP
VTPS- configured and tuned
305cc injectors
innovative LC1 wideband
running at 10-11psi

I attached my datalog and my tune can someone please look through these and let me know if you see anything out of the ordinary.

This have been giving me alot of trouble and I need some people with experience thanks guys.

1990mbt

iTrader: (1)

Anyone have a chance to look at my data? Thanks again

Ben

iTrader: (33)

I'm assuming that you're referring to the event that occurs between 286.8 seconds and 290 seconds on the log? (you can press space bar on your laptop to mark a log at a particular area while actively logging--this makes it easy to spot problem areas when reviewing the log)

I don't really see anything out of the ordinary, so much as it looks like the fuel table needs some work. Then I opened your .msq and it makes sense. WOW you are pig rich near your idle area. Actually pig rich isn't the right term, as you're richer than pig rich, but I don't know what that term would be. You're calling for basically double the fuel off idle as you do at wide open throttle.

Then on top of that area, in the light throttle tip in, coming off idle area, you're too lean. So you're going from rich to lean, rich to lean, and it's bucking around. Drop the 200's to 50's and hand smooth that table a little bit in the lower left area and you should be ok.

1990mbt

iTrader: (1)

OK well after some further reading i guess my problem is on my datalog whenever I seem to hit the gas it looks as thought I am going lean briefly. Could that be causing my stutter? an example of this is at 917, 929, 940 seconds.

How can i fix this? Acceleration enrichment settings?

Matt Cramer

Probably, and yes, that would be it needing more acceleration enrichment.