GM Maft Setup

TommyDSM · Jul 14, 2004

Ive been tryin to tune my '90 1g Talon, I have 550cc injectors and for me to get my High Trims and Low Trims around 100 I have the base set to 6 on the lean side and my Idle Knob 5 on the Rich side. Is 6 too lean for 550cc? because I get knocks during acceleration when building boost. I also have a aftermarket fuel regulator set to 43psi.
So if I lean the base out to 6 Lean does that mean my fuel regulator set too high? Also if I set the Base to 6 Lean and Idle to 5 Rich, is that the same thing is setting the Base to 1 Lean? If anyone can help me get rid of my knocks. Also I have verion 1.37 and 2.01 in the mail.

91TSIAWD_Mark · Jul 14, 2004

I had the same problem. I eneded up giving up on tuning by trims and going by knock, and the car acted much, much better.

Crazydevil · Jul 14, 2004

I had the same problems too. I would start out by going rich and then cutting back till you find the right spot. I would rather be rich then lean. Use your palm and look at your o2 volts and trims. Idle is the easiest mids will be the worst and Highs is the best. Just get your Idle and have it float around 100 then have fun with the rest.

TommyDSM · Jul 15, 2004

Well I just got my 2.01 Chip in the mail today. Hopefully it is as good as everyone says it is and easier to tune. Thanx

jetdriven · Jul 15, 2004

the startup enrichment and RPM based WOT tuning is nice. Also, the base correction is now in 20cc increments rather than the old 50cc increments.

Enjoy!

TommyDSM · Jul 15, 2004

jetdriven said:
the base correction is now in 20cc increments rather than the old 50cc increments.

Enjoy!

In the manual it says "Adjustment steps for base setup now in 64 steps of 10cc(injector size ratio".

So does it mean its 2% or 1% now instead of 5%?

sbiggi · Jul 16, 2004

change your injector size till you get your high trims at/around 100%

then set your idle and mid knobs for the trims....

once that is done do your wot setting

its the only way to get high trims tuned

jetdriven · Jul 16, 2004

you're right. Now the injector adjustment is about three times finer. You can adjust the high trim by 5%.

TommyDSM said:
In the manual it says "Adjustment steps for base setup now in 64 steps of 10cc(injector size ratio".

So does it mean its 2% or 1% now instead of 5%?

FWD_TSI · Jul 16, 2004

change your injector size till you get your high trims at/around 100%

then set your idle and mid knobs for the trims....

once that is done do your wot setting

its the only way to get high trims tuned

You are way off on mid trims. Mid trim and mid knob on MAFT are two different things.
Mid knob on the MAFT adjusts part throttle enrichment, I believe around %21 throttle input. The mid value is in effect when the green light on the MAFT lights up bright.

TommyDSM · Jul 22, 2004

If I get knocks when I start to boost around 180-200hz airflow and around 500+ it goes away, i need to adjust the idle knob or the base? Right now I have my base set at 560 and idle at 35%+ my HIGH and LOW is around 102. But I get knocks when I start to boost. Or does that mean I need to adjust the MID knob.

Neal · Jul 22, 2004

the mid knob is correct

the idle knob is seriously just for idle and maybe parking lot speed, but not much more.

TommyDSM · Jul 22, 2004

Another thing i notice today is my Green LED lights up Bright at 200hz. Doesn't that mean that the translator is reading the MID knob? I thought the Green LED lights up at 500hz.

beat90Tsi · Jul 25, 2004

dude, the ecu takes a while to adjust mid and hi trims, don't start dicking around with those settings right away
put your lo, mid, and high knobs to zero, and lean the base a few clicks, whatever the newer version says is good, I'm still running the old version so I don't know how many clicks that will be for you.

once your are up to temp you can watch the lo trim change on the logger, the ecu will adjust it just idling. Once you get the lo trim somewhere near 100, drive around for a day or two to get the mid and high trims to set in. the ecu does not adjust mid or high trims at WOT, so a lot of part throttle acceleration and part throttle driving at slightly higher rpms is what you need to get the ecu to learn those trims

that's the only way i can get mine to work, if you adjust as soon as you see the trim change, you're bound to have problems, give it a little time before you decide how much/little to add/remove.

good luck

jetdriven · Jul 25, 2004

just drive the car and watch the 02 trim. if it is near 100 then the knobs are set close. During spoolup my 02 trim would dive to 39, so I lowered the fuel pressure and leaned the mid knob and now my trims are 100-99-103. The 02 trim is a good predictor of where the trims are going to go.

drive the car at 50 mph and watch the 02 trim, tune the base knob to get this near 100. then let the car idle and watch the 02 trim and adjust the idle knob. then watch the 02 trim during spoolup around 250-500hz andf adjust the mid knob for best spoolup, 02 trim near 100, and knock.

beat90Tsi said:
dude, the ecu takes a while to adjust mid and hi trims, don't start dicking around with those settings right away
put your lo, mid, and high knobs to zero, and lean the base a few clicks, whatever the newer version says is good, I'm still running the old version so I don't know how many clicks that will be for you.

once your are up to temp you can watch the lo trim change on the logger, the ecu will adjust it just idling. Once you get the lo trim somewhere near 100, drive around for a day or two to get the mid and high trims to set in. the ecu does not adjust mid or high trims at WOT, so a lot of part throttle acceleration and part throttle driving at slightly higher rpms is what you need to get the ecu to learn those trims

that's the only way i can get mine to work, if you adjust as soon as you see the trim change, you're bound to have problems, give it a little time before you decide how much/little to add/remove.

good luck

TommyDSM · Jul 25, 2004

What if I get knocks when I accelerate and start building boost? I try richin it and leaning it but i still get knocks...

jetdriven · Jul 25, 2004

whats the 02 trim doing? too rich on spoolup will show knock also. I cured mine by leaning it out and getting a kyle tarry eprom mod.

TommyDSM said:
What if I get knocks when I accelerate and start building boost? I try richin it and leaning it but i still get knocks...

TommyDSM · Jul 25, 2004

Here's a TMO log

http://home.rochester.rr.com/tommydsm/Log.jpg
another one

http://home.rochester.rr.com/tommydsm/Log2.jpg

jetdriven · Jul 28, 2004

looks lean. see how the 02 trim goes up right before the knock? Try richening up the mid. Raising the fuel pressure slightly might do it also.

Give me another log with HZ on it.

250-500 HZ is MID knob territory.

there is also a badass website www.fullthrottletech.com

tons of MAFT tuning there.

TommyDSM · Jul 28, 2004

Those logs do have HZ on it. Its the graph on top. Ive also checked out www.fullthrottletech.com

jetdriven · Jul 28, 2004

yes, i see it now. richen the mid knob and try thay.

GM Maft Setup

TommyDSM

91TSIAWD_Mark

Crazydevil

TommyDSM

jetdriven

TommyDSM

sbiggi

jetdriven

FWD_TSI

TommyDSM

Neal

TommyDSM

beat90Tsi

jetdriven

TommyDSM

jetdriven

TommyDSM

jetdriven

TommyDSM

jetdriven

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