---===The Official MAFT-Pro Thread===---

[Maximal]

Finally got a chance to mess with the car. Turns out the not idling problem wasn't related to the maft-pro and took me a burnt up coil to figure it out (long story).

Anyways, it was running really rich and not idling all that great even with the v-out settings set to 101 and 100. Decided to install it according to the AFC wiring diagram (just had to remove a couple wires) and it seems to idle alot better now however it is running a little lean, around 16, at idle..haven't taken it out to see what I get under load.

Bob...I'm assuming this is because of your ECU overclock leaning everything out. Is something like this where I would mess with the mainscale or is there another option to fix this? I remember you saying it threw off the fuel map a set percentage (10% keeps popping in my head) for the stage 3 ECU...can I just richen the mainscale up 10% or whatever it is and have it basically set the fuel map back to stock?

Haven't messed with the LM-1 problem yet (going out there to do it now) but that should be a simple fix if you guys were right about the wiring problem.

Terry

[TurboBob]

Originally Posted by StealthES418

Finally got a chance to mess with the car. Turns out the not idling problem wasn't related to the maft-pro and took me a burnt up coil to figure it out (long story).

Anyways, it was running really rich and not idling all that great even with the v-out settings set to 101 and 100. Decided to install it according to the AFC wiring diagram (just had to remove a couple wires) and it seems to idle alot better now however it is running a little lean, around 16, at idle..haven't taken it out to see what I get under load.

Bob...I'm assuming this is because of your ECU overclock leaning everything out. Is something like this where I would mess with the mainscale or is there another option to fix this? I remember you saying it threw off the fuel map a set percentage (10% keeps popping in my head) for the stage 3 ECU...can I just richen the mainscale up 10% or whatever it is and have it basically set the fuel map back to stock?

Haven't messed with the LM-1 problem yet (going out there to do it now) but that should be a simple fix if you guys were right about the wiring problem.

Terry

somewhere between 10 and 15% would probably do it.

Bob

[Quick Vr4]

TurboBob i have a technical question. Whenever i stomp on the gas my car goes lean for a split second. The 02's read flatline at the bottom for alittle right when i stomp on the gas. After that the A/F evens out. I am running .30 on the boost enrich feature. How else can i cure this? Right now my tps enrich is at 0.

Another question I have is regarding the switching points. I believe the ecu switches from low to mid trim at 100hz and then mid to high trim at 175hz. I have been using the the recommended switching points which are a lot different then the stock ones. I belive the low to mid switch point is around 44. Where should my points be?

also what are the differnences between tps enrich and boost enrich?

[TurboBob]

Originally Posted by Quick Vr4

TurboBob i have a technical question. Whenever i stomp on the gas my car goes lean for a split second. The 02's read flatline at the bottom for alittle right when i stomp on the gas. After that the A/F evens out. I am running .30 on the boost enrich feature. How else can i cure this? Right now my tps enrich is at 0.

Another question I have is regarding the switching points. I believe the ecu switches from low to mid trim at 100hz and then mid to high trim at 175hz. I have been using the the recommended switching points which are a lot different then the stock ones. I belive the low to mid switch point is around 44. Where should my points be?

also what are the differnences between tps enrich and boost enrich?

What VE table are you running? The lean spike, is this happening on shifts or just at launch (or in neutral?) What are the other response settings?

The low/mid/hi points in the pro are in KPA (manifold vaccum) not airflow hz, you can't correlate them that way.

TPS enrichment is based on tps movement, the TB size crowds the effect towards the light throttle end.

MAP enrichment is based on the MAP sensor, as is the boost enrichment. Which one is used is based on the TPS position. MAP is light throttle tip-in, Boost enrichment is stomps and heavy throttle.

Do you have a log of this happening?

B

[DriveFast99]

so guys, i have a quick question.

i was doing a little fine tuning and wondering how lean we can or should go while cruising? i was thinking 15.5-15.7 on the highway doing like 80 in 6th gear. anybody agree or disagree with this number? do you think i'll experience bucking? i really wanna get my hwy mpg up to like 25+ and my city around 20. right now im at like 21hwy and 17city.

any help would be appreciated.

[Quick Vr4]

I have no idea what VE table I am running. I haven't even logged using the MAFT-Pro software. I am pretty sure I can get rid of the leaness by giving it more boost enrichment. It doesn't do it on light throttle. It does it between shifts and when i stomp on the gas. I once had the boost enrich at .6 and the car fuel cutted. What is too high of a setting for the boost enrich?

[Maximal]

Adjusted the mainscale to +14 and the a/f at idle now cycles between 14.2 or so to 15.2. That normal or is there something that's causing it to jump around like that? The narrowband cycles but it'll cycle a small range then do a full sweep. If I remember correctly the narrowband is somewhat new or is there a chance that's bad and is causing this?

The LM-1 issue was taken care of by changing the analog output settings and changing it to the AEM on the settings.

Sorta off topic here but I figured you guys would know. I have my RPM convertor hooked up to pin 101 for the RPM signal. However it doesn't read correctly after programming it multiple times using the sound card (desktop, not the laptop) and using the engine. Is there a different pin I should use or is there another problem? Not like it's that important anymore since I can log with the tunerpro software but it'd be nice to get it running correctly.

Terry

[TurboBob]

Originally Posted by Quick Vr4

I have no idea what VE table I am running. I haven't even logged using the MAFT-Pro software. I am pretty sure I can get rid of the leaness by giving it more boost enrichment. It doesn't do it on light throttle. It does it between shifts and when i stomp on the gas. I once had the boost enrich at .6 and the car fuel cutted. What is too high of a setting for the boost enrich?

The boost enrichment is very quick. If the lean spot happens for longer than an instant, then its the base tune.

The default VE table is lean below 3000 RPM on a 3S. Try adding some fuel in the mid and high between 2000 and 3000 (say 5 - 10%) and see if it improves.

Grab a log and let me see it.

What are the other response settings?

B

[TurboBob]

Originally Posted by DriveFast99

so guys, i have a quick question.

i was doing a little fine tuning and wondering how lean we can or should go while cruising? i was thinking 15.5-15.7 on the highway doing like 80 in 6th gear. anybody agree or disagree with this number? do you think i'll experience bucking? i really wanna get my hwy mpg up to like 25+ and my city around 20. right now im at like 21hwy and 17city.

any help would be appreciated.

Unless you have the O2 sensors disconnected the ECU is going to try to put the fuel back to 14.7 by maxing the trims, which will mess up your driveabililty.

If you have the sensors unplugged, then 16.2 is a good target. I got 25 mpg in my GN (not stock...) at 70 mph, with the A/C on. I was running about 16.2
I had some occaisional bucking, but the plug wires are about shot...

B

[TurboBob]

Originally Posted by StealthES418

Adjusted the mainscale to +14 and the a/f at idle now cycles between 14.2 or so to 15.2. That normal or is there something that's causing it to jump around like that? The narrowband cycles but it'll cycle a small range then do a full sweep. If I remember correctly the narrowband is somewhat new or is there a chance that's bad and is causing this?

The LM-1 issue was taken care of by changing the analog output settings and changing it to the AEM on the settings.

Sorta off topic here but I figured you guys would know. I have my RPM convertor hooked up to pin 101 for the RPM signal. However it doesn't read correctly after programming it multiple times using the sound card (desktop, not the laptop) and using the engine. Is there a different pin I should use or is there another problem? Not like it's that important anymore since I can log with the tunerpro software but it'd be nice to get it running correctly.

Terry

What were your trims doing?