Can't get idle below 12.5:1 AFR on Turbo'd 95 Cobra!

For discussing MicroSquirt (TM) configuration and tuning of fuel parameters (including idle valves, etc.).
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Jedrik
Helpful Squirter
Posts: 78
Joined: Thu Oct 21, 2004 9:07 am
Location: Seattle WA
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Post by Jedrik »

fuel pressure kept going to 0 and back to 42 while t
Good, then you have a fuel pressure guage and are ahead of most on that reguard.

Dataloging is easy, and somthing you will want to do everry single time you run... at least for a while.
I've been runing for... few thousand miles now and still like to log just to see how its working and kep refining the tune the last little bit.

In megatune go to File:DataLogging:Record or press Alt-L
when you are done running you go the same plase to stop the log.
Then you want to look at the file with MegaLog Viewer.

This will really help you (and us) see what is going on.

But you will deffinately have to sort out the wacky fuel pressure and CLT issue.

Good luck with the adventure in Moving. Ick!
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cuda6pak
MegaSquirt Newbie
Posts: 20
Joined: Sat Mar 04, 2006 10:55 am
Location: TN

Post by cuda6pak »

Quick update: Car is running like a beast

I messed around a while trying to get the CLT sensor to read or figure out why it wouldn't, I checked at the plug and it was getting power. So I checked Megatune and it was reading again.

I started it up last night and re-flashed the old tune again. Took it out for a spin and it was running pretty rich but still could get into boost without hiccups (dipped into 9.x:1 but mostly 10.0:1 at WOT. I took it back and messed with the VE tables a few times and got it to high 10's:1 at WOT and boosting 6lbs. I also got the idle down to 14-16:1.

I have a question of concern though at very very slight throttle only down around ~1500 rpm's it gets real lean (about 16-18:1). Keep in mind this is at very very very slight throttle, and right when I press the accelerator down just a tad further it goes to 13:1 or so. Should I be concerned with this or is this at a light enough load to where it won't hurt anything?

I just want to know if I need to tune it out before I take it out anymore or if it will be okay for a while.

Now I just need to get the AFR table setup and set up a good target AFR table...

I took it out for a while last night, even to the gas station and back and she ran very good. Let a few ricers hear the turbo spooling up while I passed by too :lol:
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MegaScott
MegaSquirt Guru
Posts: 149
Joined: Mon Jun 14, 2004 8:35 am
Location: Seattle, Washington USA
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Post by MegaScott »

When you tip the throttle like that (the leanness you mentioned) does the car stumble any?

You could try to use a TPS-MAP blend in your AE or increase the lower V/S addition.

Woops, just realised you have MSnS-extra, well anyway the Extra firmware has an alternate RPM based AE scheme that works really good you should try that.
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