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

[Maximal]

Originally Posted by Rogue_Ant

Yeah, your low user tune should cover idle and light load stuff.. Have you tried resetting the ECU? Are your O2 sensors hooked up?


-Rogue

I'll mess with it a bit more tonight and see what I can get.

The ECU has been reset and doesn't seem to affect anything. The O2 sensor is disconnected. Running speed density with an AEM wideband.

[flyman1981]

Terry - Tug got his running alright by pulling lots of fuel on his main scale (~50%) but then adding like 10% on low 400-2200 rpms on the low load tune.

[Rogue_Ant]

If your O2s are unplugged then the ECU trims shouldn't change. Are you using PT tracking?


-Rogue

[Maximal]

Originally Posted by flyman1981

Terry - Tug got his running alright by pulling lots of fuel on his main scale (~50%) but then adding like 10% on low 400-2200 rpms on the low load tune.

I have to add to my mainscale since that overclocked ECU leans it up some. I have the mainscale set to 12.5 if I remember correctly and i'm still pretty lean under load. Maybe I'll just try pulling tons of fuel from the low load tune...I might just not have gone far enough before.

Originally Posted by Rogue_Ant

If your O2s are unplugged then the ECU trims shouldn't change. Are you using PT tracking?


-Rogue

Yes, PT tracking is turned on and seems to work..sorta. It doesn't always seem to hit it's target at idle (once it kicks in) or cruising. I'll get the info to you in the PM tonight. Thanks for the help.

[UCSB VR4]

Originally Posted by TurboBob

with 720's you may not be able to go any leaner ( I heve never tuned the Big ones) Can you try raising your idle speed a little and see if that helps.

What is the MAF frequency at idle? (FO on the LCD)

FO on the LCD when the problem is occuring sits at 23-24. I think this is because the unit is trying to remove all fuel possible (CF = -10.3) when the AFS readings are 10.3.

FO on the LCD when the problem is NOT occuring is roughly 30.

I think the low FO during the rich idle is an after-effect, not a cause (the unit trying to offset the rich mixture).

Also, my trims should all be 0 b/c the stock O2s are unplugged.. should i hook up my other datalogger to verify this?

I can try resetting my ECU and increasing the idle speed if you think that will help also.

- Jeff

[EastWingedBeast]

Right, having thrown my toys out of the pram and had a really big trantrum, I'm back.

I have the car running MAFT Pro with v5.03 firmware, and the .bin supplied with it. I've got mainscale at -34.5 (coz 550cc injectors), and I've modified the VE map to compensate for slow reactions at idle and cruize. Here is the thing.

The car runs much more predictably and acceptably with the PT tracking turned off! PT tracking seems to react far too slowly and far too much to be of any use. I've tried many different settings for the Gain, and different AFR targets. It never, ever performs how I would expect it to. Take idle as an example. My current VE map, the car idles at between 14.2 and 14.9. I'm happy with that. Turn on PT tracking and set idle to 14.5. ... ... All over the place. 13.n to 15.n. Cyclic. The car also cruizes how I would expect, unless PT is enabled. Again, with PT enabled, all over the place.

I think we are chasing a moving target, and the best we should hope for is nothing like what we should be getting.

Anyone having the same stress?

Paul.

[Rogue_Ant]

EastWingedBeast,
Your stock O2s are unplugged correct? Where is the WBO2 sensor installed? Post your PTT settings.


-Rogue

[EastWingedBeast]

Originally Posted by Rogue_Ant

EastWingedBeast,
Your stock O2s are unplugged correct? Where is the WBO2 sensor installed? Post your PTT settings.


-Rogue

Correct. The stock O2 (jap spec) is replaced with the AEM wideband, in the same hole. Jap spec cars only have 2, one before and one after the cat. 2nd O2 is just to let the ECU know that the cat is working. It is under the carpet somewhere, as it has no cat anymore. WBO2 is in the same hole as the one the ECU used to take notice of for mixture control.

PT settings are all off now, but for example, I had:
TPS at 0.64, coz idle position is between 0.59 and 0.62
RPM at 1408rpm, cold start idle is just slightly less.
Idle AFR was either 13.5 or 14.5, doesnt make a diff.
Gain, I've tried anything from 15 down to 4.

PT tracking makes everything go squiffy. With PT off, it works
a lot better, and is a whole heap more tunable. PT just buggers it up.

I have been fiddling with this for almost a year now, and I think I know the system pretty well. My original idle problems were the same as everyone elses, and turned out to be a software bug with respect to the TPS tipping in on idle TPS fluctuations. I reckon there are several more bugs to be ironed out of this thing before it becomes "useful". The latest thing I've discovered is that it isnt only the TPS which fluctuates. RPM and baropressure are sampled rather coursely too. I thought I had excessive interference on all signal wires, until I scoped it. All within acceptable limits, but the MAFT Pro seems to be sampling and using raw values. Lets not forget that the stock ECU works brilliantly in every respect, including sampling and cleaning up input signals, without losing response time and accuracy. I dont want to sound negative. I think the MAFT Pro is a good tool. I just dont think it is ready yet. There is a reason that the AEM ECU is $1600! It works out of the box.

Still not wanting to sound negative, I've spent a lot of money on this car. New hybrid turbos, fuel pump, injectors, intercoolers, etc. etc. etc. The only thing that is letting the side down is the MAFT Pro.

If you are still reading this, thank you. I have a suggestion. Why dont TurboBob or a another developer go to a fresh install who is having mega problems with the setup, and set it up for them. I think this would be an excellent R&D excercise??? Not everyone on this forum is a muppet, which seems to be the assumption if they are having problems.

I feel better now. lol

Paul.

[Rogue_Ant]

Just a couple of points..
The majority of the time, most issues are simply things have either been overlooked or miss-understood. This is why when trouble-shooting, its normal to start at the lowest common denominator.
The AEM EMS does not work out of box. It might come with a base-map to get you going, but tuning is an absolute necessary. This is true with any engine management solution.
Finally, what makes you think that we haven't gone to help people in person? I have never turned down a request for help, and have taken quite a bit of personal time to help people who are local to me.

I know it can frustrating, when something isn't working how you want or expect.

You have a PM BTW.


-Rogue

[1fastvr4]

I can vouch for the statement below. Joshua drove an hour and a half to my house at least 3 times to help me get my car tuned. He never asked for anything in return. Great guy to work with and very knowledgable!!

Dean

Originally Posted by Rogue_Ant

Just a couple of points..
The majority of the time, most issues are simply things have either been overlooked or miss-understood. This is why when trouble-shooting, its normal to start at the lowest common denominator.
The AEM EMS does not work out of box. It might come with a base-map to get you going, but tuning is an absolute necessary. This is true with any engine management solution.
Finally, what makes you think that we haven't gone to help people in person? I have never turned down a request for help, and have taken quite a bit of personal time to help people who are local to me.

I know it can frustrating, when something isn't working how you want or expect.

You have a PM BTW.


-Rogue