MAFT Gen 2 - Anyone?

[Drweldin]

TurboBob,

Question: My car is in storage til spring, w/o battery....how long will the GEN 2 retain setting w/o power? Hopefully til spring....?

[twinturbvr4]

Originally Posted by Drweldin

All I can say is read thru the 1st few pages of this thread, because I asked Bob a lot of questions, and he is the expert here. His recommendations have been right on....
Otherwise, I think with 450's your correction should be in the -20 to -25 range...(my experience)....also, I would have larger than 450cc for 16T's but your call.....like I said read this entire thread, and make sure you go thru each screen / parameter and set it up correctly top to bottom - my car runs great (Gen 2, GM MAF in blow thru, 560 Evo injectors, twin intakes, etc...)

Yes, its more of a misunderstanding for me, I've read this thread top to bottom about 3 or 4 times just today now.. and really just dont have an idea where to start.. I think once I get some basic settings down, I can begin to understand more.. The only thing I have really changed is the main scale and just slightly the afterstart..

I am running stock intake with the 16ts and 450s.. draw thru..

[TurboBob]

Originally Posted by Drweldin

TurboBob,

Question: My car is in storage til spring, w/o battery....how long will the GEN 2 retain setting w/o power? Hopefully til spring....?

its something like 10 years........

[Drweldin]

Originally Posted by TurboBob

its something like 10 years........

lol.....ok - cool
Can you explain how that works....capacitor?

[twinturbvr4]

Ok, I'm sittin at about -22.5 on the mainscale and about .4 on the afterstart, seems to run pretty decent, I do throw a CEL once I go above 2k rpm every time I start the car.. Like I said, I really have no idea what to start doing here... Bob, maybe you can help me? hopefully I'm not too newb with this to understand some things.. I basically just want to at least get ALL the basics setup.. 450cc injectors, 16t turbos, mbc (was able to push to 18psi right now with that -22.5 main scale, holds quite well) I have it set to 3kgt maf sensor, 6 cylinder, Im not sure on the displacement of the 3S (i just havent looked it up yet) and I believe I have all other options at whatever they were out of the box..

Then hopefully as I learn more I can begin to fine tune other things, I have a WB (not connected to the GenII tho) Sitting around 14.7 at idle and in that ballpark on moderate throttle, at WOT it goes up around 11, so I think that is pretty decent (just on the mainscale and afterstart settings)


Thanks if you can help an un-educated poor sap here!

[Drweldin]

Originally Posted by twinturbvr4

Ok, I'm sittin at about -22.5 on the mainscale and about .4 on the afterstart, seems to run pretty decent, I do throw a CEL once I go above 2k rpm every time I start the car.. Like I said, I really have no idea what to start doing here... Bob, maybe you can help me? hopefully I'm not too newb with this to understand some things.. I basically just want to at least get ALL the basics setup.. 450cc injectors, 16t turbos, mbc (was able to push to 18psi right now with that -22.5 main scale, holds quite well) I have it set to 3kgt maf sensor, 6 cylinder, Im not sure on the displacement of the 3S (i just havent looked it up yet) and I believe I have all other options at whatever they were out of the box..

Then hopefully as I learn more I can begin to fine tune other things, I have a WB (not connected to the GenII tho) Sitting around 14.7 at idle and in that ballpark on moderate throttle, at WOT it goes up around 11, so I think that is pretty decent (just on the mainscale and afterstart settings)


Thanks if you can help an un-educated poor sap here!

lol...."not sure of the displacement"?
hint: "3000" GT
Rather than ask "what should I do".......pinpoint what parameters you have questions about / issues with...........

[twinturbvr4]

Originally Posted by Drweldin

lol...."not sure of the displacement"?
hint: "3000" GT
Rather than ask "what should I do".......pinpoint what parameters you have questions about / issues with...........

haha... yea yea i figured the displacement out shortly after I asked the question.

What I did now was I backed the mainscale back to around -10 and adjusted the high,mid,low tunes.. I set my low ~800rpm to about -7.5, mid ~2800rpm to around -7.5, and my high ~2800rpm to about -10, I have a gutted stock MAS and am running fairly lean with those conditions. The car takes a couple seconds for the boost to build like that. Before when I had the mainscale set around -22.5 The spool up was a little quicker, but still a bit lean, so now I'm either going to change my high,mid,low settings or figure out how to add a little fuel without changing the settings too much.

[Drweldin]

Originally Posted by twinturbvr4

haha... yea yea i figured the displacement out shortly after I asked the question.

What I did now was I backed the mainscale back to around -10 and adjusted the high,mid,low tunes.. I set my low ~800rpm to about -7.5, mid ~2800rpm to around -7.5, and my high ~2800rpm to about -10, I have a gutted stock MAS and am running fairly lean with those conditions. The car takes a couple seconds for the boost to build like that. Before when I had the mainscale set around -22.5 The spool up was a little quicker, but still a bit lean, so now I'm either going to change my high,mid,low settings or figure out how to add a little fuel without changing the settings too much.

Not sure why you would set the mainscale so rich...I have my mainscale at -36 with 560cc injectors....which is exactly what you would expect doing the correction math....from there I just fine tune by rpm, but you can also fine tune with "MAF" load, which I have experimented with a little, but with no way to log MAF load, have decided to just tune AFC style by rpm,....I can def. see the advantage to logging MAF load, because then youd have a truer sense of where to tune....I generally end up fatting up fuel at the mid-range (2800-4200 area)...but not by much, maybe - 3 or so %...I let the LC-1 control WOT with the AF correction feature. I have not got that portion dialed in perfect yet, but it works pretty well.....if you use it, there is a gain adjust ment, as well as min/max correction factors that def. come into play....I found I had to turn the gain up to around 10 or so, and turn my max "lean" correction up to about 8-10% also to get it to lean out enough, and consistantly...thats what Im still working on, as I am still a little rich WOT...I also have timing control via Apex ITC (something everyone should consider - timing control that is...) I def. use the ITC too...

[twinturbvr4]

Originally Posted by Drweldin

Not sure why you would set the mainscale so rich...I have my mainscale at -36 with 560cc injectors....which is exactly what you would expect doing the correction math....from there I just fine tune by rpm, but you can also fine tune with "MAF" load, which I have experimented with a little, but with no way to log MAF load, have decided to just tune AFC style by rpm,....I can def. see the advantage to logging MAF load, because then youd have a truer sense of where to tune....I generally end up fatting up fuel at the mid-range (2800-4200 area)...but not by much, maybe - 3 or so %...I let the LC-1 control WOT with the AF correction feature. I have not got that portion dialed in perfect yet, but it works pretty well.....if you use it, there is a gain adjust ment, as well as min/max correction factors that def. come into play....I found I had to turn the gain up to around 10 or so, and turn my max "lean" correction up to about 8-10% also to get it to lean out enough, and consistantly...thats what Im still working on, as I am still a little rich WOT...I also have timing control via Apex ITC (something everyone should consider - timing control that is...) I def. use the ITC too...

thanks for the help man.. I went out and worked a little more with it, I actually ran through the Turbo Buick setup document on fullthrottletech just to get an understanding of some of the base features. Right now I have my mid and high load rpms set just about perfect Im starting to catch on! I have an older techedge WB, my display doesn't have the 2nd output that I could connect to the GenII unfortunately, so I wont be able to utilize the AF tracking just yet, I think Im going to get a DB9 cable to connect the module to the GenII, or I may order a newer display that has the extra DB9 cable to do such a thing.. As of now, I have my mid and high load rpm tunes set to around -7.5 to -10 or so respectively. As much as I tinkered with the low rpm tune, I was unable to get the mixture to richen at all, running around 16-17afr at idle (600-700rpm) I set the low tune rpm around 400 and dialed both + and - upwards of about -20 to +20 with no results.. did the same at 800 rpm.. out on the road its pretty much perfect at WOT (around 11-12 afr at WOT @18psi) And once the car is warmed up (ie, when I come back from making a run) It "feels" like its idling just fine... but still has the lean afr.. so not sure where to go with that.. still havent really messed with anything other than the mainscale, and high,mid,low tunes.. as everything else still throws ??? above my head..


btw.. like I said im new to tuning and AFR and stuff... how do you actually calculate the mainscale for 450s?

[Drweldin]

1-(360/450) * 100 = 20% correction

In my case: 1- (360/560) * 100 = 35.7 % correction

360 being stock injector size