Got my appointment...

[TheBlizzard]

1000's.

[slowbubblecar]

thats what I though, thanks

[A//// Guy]

GM MAFT is no better than an AFC. All it does is try to fool the stock ECU in the same exact way.

True but you can compensate for injector sizes. Meh worked for me, its not AEM or DSMlink but it works well.

[TheBlizzard]

An AFC and a MAFT try to accomplish the same goal but they do it in different ways. The AFC has more refined tuning points based on RPM and the MAFT has a more raw approach to tuning by using injectors compensation and 4 points of RPM tuning. I guess you could compare a MAFT to a 5 knob AFC on steroids. With the difference being that you can eliminate the stock MAF and compensate for bigger injectors with the MAFT. Obviously there are a few more benefits but you get what I mean.

The only draw back to a MAFT over an AFC is the MAFT uses bionary dipswitch combinations to adjust A/F ratio as well as different combinations for different injectors sizes. Another thing that sucks about the MAFT is that it only uses four different RPM points for tuning. Obviously with the AFC you have a few more RPM points to tune with as well as high and low throttle settings on the newer versions. I think thats the reason a lot of people use the MAFT with the AFC. You get the benefit of running bigger injectors without having to max out your AFC into the minus and you get the AFC to fine tune where the MAFT will not.

For a stock 450cc application you zero out everthing except for the AUX, that you would set to 3. I am not 100% sure but I think the new version of MAFT can compensate for up to 1200cc injectors.

[A//// Guy]

I was using the MAFT and 5 Knob AFC ;)

[Kracka]

I was using the MAFT and 5 Knob AFC ;)

That was my setup too with a 20G, 650cc injectors, and a rewired Walbro 190.

[Super Bleeder!!]

tom shoud sell his driveline to shane :)

[Shane@DBPerformance]

With an AFC you compensate for 650cc injectors by leaning out the low and high throttle by 30%. So the AFC interupts the signal from the MAS going to the ECU and lowers the signal amount by 30%. With the MAFT, you set the dipswitches to 650 injectors, and it interupts the signal from the MAS going to the ECU and lowers the signal amount by 30%. They do the same damn thing, the MAFT isn't any better or safer than an AFC, it just lets you run a GM MAF instead. Unless you change the code directly inside the ECU, you are just tricking something somewhere.

[niterydr]

Just to claify, I consider a car 'running like ass' when it doesn't know which timing map to run it, which is usually a result of to much correction needed of the airflow signal.

[TheBlizzard]

What I was kind of getting at was:

If you have to lean out the AFC by 30% with 650s just to get the car back to normal then that leaves you about 20% of tuning on the lean side. The bigger the injector that worse you are going to have to go into the negative. With the MAFT in conjunction with the AFC you can zero out almost any injector size you are going to run and then still have 50% on the plus and minus side of the AFC for fine tuning.

If you use the MAFT on its own then I agree its just a matter of picking your poison, both are trying to accomplish the same goal. They just do it in different ways. I would feel safer with an AFC since its a lot more refined but on the same note its a lot more limited to how much fuel you can take out to compensate for bigger injectors.

If somebody can show me a 2G that is running 1000cc injectors with a stock ECU and a AFC I will stand corrected.