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

[venik]

For some reason, on decel I run rich... its fine till i decel below 2500 rpm or so, I havent been able to check for smoke(if there is theres is very little), but I'm pretty sure it's not oil or coolant giving me the rich reading. I think its fuel because it doesnt decel as fast as it should. Anyways, does MAP enrichment affect this? Any ideas?

and ucsb, i had a problem like that and it was due to having a bad setting, tpsmaflim or something was supposed to be 0 and it wasnt (for speed density)

[TurboBob]

Originally Posted by UCSB VR4

See signature for setup.

In my initial tuning stages, I'm focusing on idle and low load tune (haven't even started to look at mid or high load, WOT, Boost Control, etc...).

I'm having problems getting the car to idle properly (it seems to bounce from stoich to lean to rich almost at random). I've experimented with unplugging the stock O2s and plugging them back in with no huge difference. Is there any advice you can give me? I've just been toying with mainscale and low-load adjustments. Car runs fine when it's in gear and i'm driving around the block.

I've attached my settings (see exportTProV4800.txt).

I was expecting to attach the log, but it exceeds the 100k attachment limit. Basically, the thing idles okay for a couple minutes, I just tap the gas pedal, then the wideband jumps around from lean to rich (extreme to extreme), then it goes completely lean for 15 seconds or so before the engine finally dies (this is all after minutes of semi-rough idleing). Idle seems to be completely random, I just can't keep it under control. Help!

- Jeff

switch to VE table #2 (you need to use the keypad to do this). This should help your idle a lot.

Bob

[gearheadvr4]

Can I adjust the wideband scaling on the maft pro so i can also use my LC-1 with MMcd/Palm??

I believe the MMcd software uses 0-5V = 8.0 - 22.0 AFR. What is the maft pro set to when you select LC-1 option for wideband?

[TurboBob]

Originally Posted by gearheadvr4

Can I adjust the wideband scaling on the maft pro so i can also use my LC-1 with MMcd/Palm??

I believe the MMcd software uses 0-5V = 8.0 - 22.0 AFR. What is the maft pro set to when you select LC-1 option for wideband?

the pro settings are fairly close. 7.35 - 21.35 I think.

I can look into adding that oddball scaling into the pro software at some point.
but the LC1 has 2 outputs, program one for the MMCd and one for the Pro.

[gearheadvr4]

I thought my LC-1 only had an analog for narrowband and a second output for wideband. Let me go reference the manual again. Since I have my stock O2 sensors disconnected and i'm using the Maft Pro for everything I really don't need the narroband sim anyways. If I can program the 2 outputs for wideband then i'm golden. If not, then how much would that small difference make in the AFR reading? I assume not too much. I just want it as accurate as I can get it.

edit: looks like they are both programmable so I should be ok. Now I just need to find the ground wire for the EGRT. I'm sure the positive is pin 53 but not sure if it's 71 or 72 for the ground.

[mightymoose]

very quick question: I have a MAFT-pro with S/D setup on my 92 VR4. Pretty much everything is tuned pretty close to where I want it at the present moment. However, and this only happens with either the AC or the fans on really high speed, the AFR reads at 7.9 and just stays there, and I'm getting an error on my LC-1 LED of 2 which indicates a short in the wire or bad sensor,, checked everything and everything checks out.

Any suggestions..??

thanks
James G

[TurboBob]

where are you getting power and ground for the lc1?

[mightymoose]

In the recommended locations as indicated in the wiring diagram, just as in the first page of this thread, as I said, this only happens when either the A/C or fans are running on high. Only appears to be affecting the LC-1, I can't observe any change in driveability(really should verify with another datalogger-can't at this time) the tune still feels there, the WBO just isn't reading right-definetly something that be happening..

[UCSB VR4]

Update: Upgrading to firmware v5.0 and switching to VE Table #2 definately helped my idle, thanks for suggesting those things.

Questions:

1. What do the following settings (new in v5.0) mean:
* Enabl. Dly "115" ???
* ETPS RPM: "4800" ???
* ETPS Load: "166.4" ???

* Lim MinRPM "0" ???
* Lim Time "0.0" ???

(I couldn't find them doc'd anywhere, I see you're still working on the documentation)

2. What is creating the loud ticking noise on the firewall? Is it the GM 3bar MAP or the EBC High Boost Solenoid?

3. If I rev the RPMs in neutral, I run a bit lean (i.e. 16.0-17.0). If I cruise at low load (same rpm), then I run rich (i.e. 11.0-12.0). What settings should I utilize to even this out? (see attached settings below)

Thanks,
Jeff

[TurboBob]

Originally Posted by UCSB VR4

Update: Upgrading to firmware v5.0 and switching to VE Table #2 definately helped my idle, thanks for suggesting those things.

Questions:

1. What do the following settings (new in v5.0) mean:
* Enabl. Dly "115" ???
* ETPS RPM: "4800" ???
* ETPS Load: "166.4" ???

* Lim MinRPM "0" ???
* Lim Time "0.0" ???

(I couldn't find them doc'd anywhere, I see you're still working on the documentation)

2. What is creating the loud ticking noise on the firewall? Is it the GM 3bar MAP or the EBC High Boost Solenoid?

3. If I rev the RPMs in neutral, I run a bit lean (i.e. 16.0). If I cruise at low load (same rpm), then I run rich (i.e. 12.0). Is there a setting I can use to address this or how do you recommend I go about evening this out?

Thanks,
Jeff

The Enable delay is for part throttle tracking, leave it at 100 for now.

The eTPS feature is mostly for the Supra crowd, it emulates the TPS on one of the analog outputs that swings to WOT at a set RPM or load, its to force the ECU into WOT mode when you start making boost.

The MAP sensor doesn't tick. The Boost solenoid should not tick when you are not making boost...... My stock boost solenoid used to tick, so I yanked it.

Lim Min RPM and Lim time are for the drop-throttle limiter for leaning out coastdown and shifts.

record a log of those 2 points, or at least make note of the RPM and MAP readings at these 2 points. The base tune is somewhat coarse in that range, but Version 5 has some enhancements to help tune that.

Bob