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Old 05-13-2008, 01:22 PM   #2855 (permalink)
UCSB VR4
Forum Member
 
Join Date: Jan 2003
Location: San Jose, CA
Drives: 1992 3000GT VR4
Trader Rating: (1)
UCSB VR4 is an unknown quantity at this point
Default Re: ---===The Official MAFT-Pro Thread===---

Quote:
Originally Posted by TurboBob View Post
with 720's you may not be able to go any leaner ( I heve never tuned the Big ones) Can you try raising your idle speed a little and see if that helps.

What is the MAF frequency at idle? (FO on the LCD)
FO on the LCD when the problem is occuring sits at 23-24. I think this is because the unit is trying to remove all fuel possible (CF = -10.3) when the AFS readings are 10.3.

FO on the LCD when the problem is NOT occuring is roughly 30.

I think the low FO during the rich idle is an after-effect, not a cause (the unit trying to offset the rich mixture).

Also, my trims should all be 0 b/c the stock O2s are unplugged.. should i hook up my other datalogger to verify this?

I can try resetting my ECU and increasing the idle speed if you think that will help also.

- Jeff
__________________
1992 RED 3000gt VR4:
Air:
DR 650s, DSM SMICs w/ 1 3/4" piping, hard pipe kit upgrade & 2 pre-turbo (no-maf) pipes w/ filters, GReddy Type-S BOV (open loop).
Fuel:
MAFT-PRO v5.03 (SD mode w/ Electronic Boost & Timing Control, GM 3 BAR MAP Sensor, GM IAT Sensor, & Innovate LC-1 wideband O2), Supra fuel pump (hotwired), 550cc PTE injectors @ 45 base psi.
Ignition:
Magnecore KV85-R100 spark plug wires, Denso iridium IK27 spark plugs, Odyssey PC925 battery.
Engine:
.03" Overbore, 2nd-gen Lifters, polished heads.
Exhaust:
Gutted precats, ATR 3" downpipe, 3'' Test Pipe, ATR 3" catback.
Drivetrain:
RPS 6-puck disk, RPS lightweight flywheel, 3sx lightweight drive pulley, polyurethane motor mounts, stillen drilled and slotted rotors, 18x9.5 5Zigen FN01RC rims, BF-Goodrich KDW-2 tires, Cusco rear strut bar.
Miscellaneous:
Corbeau seats, short throw shifter, presidential alarm system, 8 inch bazooka tube, kenwood double-din deck, 300lbs of miscellaneous weight reductions... "who's your daddy?" license plate
Future Mods:
1 Piece PST CFDS
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