MAFT Gen 2 - Anyone?

[twinturbvr4]

Originally Posted by MadgwickTT

With maft GenII blow through gm3.5 maf fuel pump and 450cc injectors am i going to need a FPR or will the stock one be fine since i am adjusting fuel through the maft?

Good question, I have yet to upgrade this too, I believe this is a good idea whenever upgrading the fuel injectors and/or pump?

what kind of settings are you running? As I have yet to get good settings yet, Im ONLY running a mainscale of -15, as you can see above, this works best for me so far..

[MadgwickTT]

Well i'd love to say i set it up but i actually ordered it this morning just wanting everything to be as smooth as possible, my cars in pieces right now, were 2 tone painting it @ my bodyshop, i plan on installing everything as soon as i get it but i had someone tell me there running 660c injectors with the works and they still use there stock FPR i guess its prolly better to use an A/M But the stock should hold what i plan on doing.... til next winter at least

[twinturbvr4]

I did a 2nd gear pull from 2000rpm to redline, only 2nd gear because it was raining pretty good last night and didnt wanna open up 3rd gear on the roads near my house :-P

Ok here are the numbers at 6187 rpm

INJP 4.60ms
KNCK 13
O2-R 0.93v
O2-F 0.76v
TPS 32.8%
INJD 23.4%
TIMA 31 degrees
AIRT 71 degrees
EGRT -18.1 degrees
ISC 23.4%
FTRL 114.8%
FTRM 92.9%
FTRH 107.0%
MAFS 1572.4Hz
ACLE 82.0%
FTO2 100%


Unfortunately still no WB yet.

Ok, I went back and tried several increments on the mainscale. Last nights pull was at -15.

I tried running -10, -12, -13, -14 (these numbers all seemed to have kind of a flat boost feeling.. if that makes sense, the boost was there, but not nearly as powerful) tried -16, -17, -18, -19, -20 (these all had really long bogging down periods, 2+ seconds, before building boost) then I tried going as far as -25 to -30, these had longer bogging periods than before 4+ seconds, and then suddenly the boost kicked in. I don't understand why -15 seems to work the best, as its still yes, probably rich and I'm still getting delayed boost build.

anyway, hopefully I can keep getting more info.

thanks for all the help guys!

[twinturbvr4]

if this is WOT, and I've got 107% fuel trim on High.. does this mean I should adjust my High tune to accomodate 7% richness? if so, do I do it across the board for all rpm ranges?

[Drweldin]

Originally Posted by twinturbvr4

if this is WOT, and I've got 107% fuel trim on High.. does this mean I should adjust my High tune to accomodate 7% richness? if so, do I do it across the board for all rpm ranges?

Not exactly....Ive noticed my trims can fluctuate 7% with just 1 or 2% on the AF (mainscale) adjustments....of course you wouldnt adjust accross the RPM range, but only in the problem area....I would richen that area 1 or 2% and see what that does....but again, WB is the way to go....then you can use WB tracking which does most of the WOT tuning for you.....

[twinturbvr4]

Cool.. well.. according to the logger those fuel trims were constant throughout the 2nd gear pull from beginning to end. So I'm not exactly sure what area I should richen.

The WB I have only has 1 db9 cable from the display, so would I just get a new db9 cable to go directly from the converter box to the GenII and totally bypass the display?

I had about 4 knocks starting at 5300rpm, and up to 13 at 6200rpm. Whats an acceptable knock value for that high of rpm?

[Drweldin]

Originally Posted by twinturbvr4

Cool.. well.. according to the logger those fuel trims were constant throughout the 2nd gear pull from beginning to end. So I'm not exactly sure what area I should richen.

The WB I have only has 1 db9 cable from the display, so would I just get a new db9 cable to go directly from the converter box to the GenII and totally bypass the display?

I had about 4 knocks starting at 5300rpm, and up to 13 at 6200rpm. Whats an acceptable knock value for that high of rpm?

Thats the problem.....trims dont change instantaneously, LIKE A WB.....
Cant answer the cable ?, but I doubt its that easy.....knock should be kept to as low as possible....Im ok with about 1-2 max at any given time...but preferably "0"......

[twinturbvr4]

Now when Im driving and monitoring my RPMs.. Im set at -15 on the mainscale, thats what I logged at.. I've noticed between 2000 and 3000 rpm is generally where I get the bogging down before the boost suddenly kicks in, since Im running a bit rich, should I lean it out under heavy throttle right around this rpm range?

Im trying to figure out how I can interpret my log results and what I can adjust to compensate.. hopefully downpipe and WB are going back on this weekend.

[MadgwickTT]

Is the hookup different for a 94+ stealth all i can find is 91-93 wiring instructions or does anyone know where i can find wiring instructions for 94+ thanks

[twinturbvr4]

http://www.fullthrottletech.com/forumdisplay.php?f=65


This page has all the wiring instructions not sure if the 2G DSM will work for ya or if its different from the 1g 3/S