Guys,
The car in the signature has 24lb injectors. I finally got the car running well with the stock 89vette manual no vats chip. Runs like a crackhead!(its all good). Well as good as it can get at the moment anyways. Ok, well if i sit at an idle for a few seconds my, autometer air/fuel ratio gauge tells me i'm running WAY lean. I remember reading somewhere that Glenn has set his injector flow rate up to 30lbs with the stock 22lb injectors?

Could i get some oppinions/votes to what i should try? I was thinking with starting at 32lbs and then seeing what happens. Oh and i don't have diacom or any other scanner type set up at the moment. Working towards that in the near future. Just want to get the car running the best i can till i can swing the diacom.

Thanks,

Brendan

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1987 IROC-Z L98,SuperRam,EB 6085's,LPE 219/219 Roller, Crane 1.6RR, EB TPI Base, 58mm TB, ADS 24#, AFPR, K&N, EB TES, Catco Cat, 3" Borla Cat-Back, Accel cap,rotor,distro/other crap, MSD 6AL, MSD Blaster 3, Aluminum DS, 94 Disk Rear, Adjustable Valve, Precision 3.73 Gears, Sub-Frame Connectors, Hotchkis Lower Control Arms, KYB Shocks/Struts, Suspension Techniques Lowering Springs, Polyurethan Bushings all over the place, Moog Upper/Lower Ball joints and Tie Rods ends/Idler Arm,

To see the ROC, Check out the webpage Here

 

You'll actually want to -lower- the injector constant if you're running lean. But since this lean condition is just at idle, then that shouldn't be a big problem. My IROC also runs lean in block learn cell 0 (idle in drive or park, I forget which one) with block learns around 140, but they're 126-130 everywhere else. I know I need to adjust the 1st MAF table but I haven't thought and researched it enough to figure out which way to changed it. I do know that the MAF is reading 6-7 grams/second at idle if that helps anyone...

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Greg Westphal
'87 IROC 305TPI/A4

 

why in the world would you worry about a lean idle? is the car dying or something?

 

Yes the car dies after a few seconds of idle. probly about 15-30seconds, it varies.
kicks from 700-900rpms and then down to 500 sometimes. Then die when it feels like it

 

Greg is right, increasing the injector flow constant shortens the pulse width (leans). You'd want to do the opposite as Greg suggest; decrease the constant to increase the pulse width and richen it.

But I must caution you that this change results in a "global" change; thus it would richen you throughout.

If everything else looks "reasonable", I would play with the smaller value of the MAF Scalar tables. This would result in changing just the area you want to work with.

I am slowly starting to understand MAF and it seems you have to match Fuel (and spark) to air flow vs load like we do with SD.

It may take a little experimentation, but once you "play" with some of the settings, you will begin to see how they affect the BLM/INTs.

Also, I prefer to lock the BLM to 128 (min/max) and work with the INT by itself. Its a "finer" level of change. On SD cars, the relationship is changeable; but basically every 5 INTs = 1 BLM change.

 

have you already ruled out every other possible problem like EGR or IAC ?

 

I just recently set the iac and i don't get any egr codes. i don't have tuner cat yet. Its on its way. but i was thinking of just disabling the egr system all together.