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

[UCSB VR4]

Originally Posted by TurboBob

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

So, "Enabl. Dly" setting is a delay in seconds before all PT Tracking settings begin (i.e. PT Idle and PT Cruise)? Is this similar to PT Tracking Lean Cruise Delay setting?

Edit: So I got home and was playing around with the cold startup enrichment setting. After turning the key on & off 3-4 times within a 5 minute window, my LC-1 seems to have gone to hell. Now, the AFR on the MaftPro just reads a constant "--". The LED I wired up hasn't changed at all since I first completed calibration (it blinks 29 times after key-on, then stays on constantly, no warning of an error there). Did I mess up the LC-1 or wideband o2 somehow by turning the key on/off a few times like that? Has anyone seen this happen before? I really don't feel like jacking the car up again and looking at the wideband to make sure everything is OK. Also the AFR will randomly incorrectly read the two extremes (8.x or 22.x) even though I can tell AFR is correct (or close).

- Jeff

[gearheadvr4]

Do you have a computer that you can hook the LC-1 into to verify readings? Use their software, maybe reload firmware onto the controller.

[EastWingedBeast]

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. 16.0-17.0). 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

I'm having the exact same problem.
To be able to rev in neutral, +20% ish in the low tune. Then the MAFT Pro has to pull 15% to 18% when cruising. Sort that out, and it wont rev in neutral anymore.

(By the way, the ticking, if you have an aftermarket fuel pressure regulator mounted on the firewall, its probably that. Mine did. In the bin now).

Whats going on TurboBob?

I cant see a way of having both correct, as one affects the other.
I understand the relationship between main scale, lo/mid/hi tune. My conclusion is that this thing simply doesnt work for most people. I've been told that I am in the minority, in terms of this not working or being tunable, but my long term experiance of this forum and GTOUK tells me that most people DO have multiple problems with the MAFT Pro. It would be nice to be proved wrong.

TurboBob,
From our last communication, I have tried altering the mainscale until the car cruises ok, instead of using the formula (which was the first contradiction). Wherever I move the mainscale, I still cant have neutral revs and part throttle cruise almost lambda 1. Either, it will rev and pulls all the fuel when cruising, or it cruises almost lambda 1, yet wont rev in neutral. My gut feeling is that the TPS algorithm is still a bit iffy. I dont want to be negative, but I installed my MAFT Pro in the summer time last year, and the car hasnt worked properly since. I had real trouble getting the car to idle (failed miserably) and I was told all kinds of crap about the fuel pressure and what not. In the end, it was a software bug. When v5.0 was released, what a surprise, everyone on the GTOUK forum had also been suffering from poor idle control.

With that super winge out of the way, whats the difference between 2000rpm in neutral, and 2000rpm cruising? The load(kPa) and therefore the throttle position(v), right?

I'm confused, bored and unprintable. Cant wait for the Nissan GT-R to come to the UK, so I can send this old clunker to the car park in the sky. With pleasure.

Thats it. Nothing more to say. The car is in the garage waiting for me to have an idea about what the hell to do next. I'm driving a Volvo!!! Thanks a lot.

[UCSB VR4]

Fixed the wideband 02. I just had to recalibrate.

I'm posting my .adl file, which logs rpm, map, CF, and wideband AFR. I'm also posting my exported settings in a .txt file.

The first session is a constant 2500rpm in neutral. You'll see the CF anywhere from +10% to +2%.

The second session is 2500rpm cruising in 2nd gear (don't pay attention to anything until roughly 35 seconds into the log). This is where I'm able to hold the RPMs at ~2500 in 2nd gear. You'll notice the CF goes anywhere from -3% to -6.5%.

Bottom line is, same RPM (2500), is lean in neutral but rich in 2nd/3rd gear. It actually get's richer in a higher gear (3rd gear for example, I'll see -11% CF). I wasn't able to log 3rd gear b/c it's dark out and I'd rather not pull 45 down my residential street while messing with the laptop on the passenger seat .

Is there a setting I can utilize to straighten this inconsistency out or do I have to start looking into modifying the VE table?

- Jeff

(PS: That last post by eastwingbeast is scaring me!)

[TurboBob]

I looked at the log, and have a couple comments.

1, part of whats going on may be the ECU changing entering decel enleanment (your neutral rev session) when this happens, the Pro wants to add fuel to maintain your set target AFR. Running larger than stock injectors makes the ECU enter decel enleanment much easier than with the stockers.

2, when driving it looks ok, I typically tune so the CF hangs in the -5 - -15% range. Note that when lean cruise kicks in, the CF will go further negative to lean the car out, so CF numbers like -15% would be expected...

3, the change from -6% in second to -11% in 3rd is not huge, but could be tuned out using the VE table, or some fine tuning with the tune pages.

So I think things are 'in the ballpark' with your tune.

That said, tuning further with the VE table is not difficult. But with any speed density control system, there is more to it than with an SAFC.

Bob

[Maximal]

So I may have missed it but has a launch control ever been built into this? If so are there setup directions on here?

[TurboBob]

Originally Posted by Maximal

So I may have missed it but has a launch control ever been built into this? If so are there setup directions on here?

I have some ideas on how to implement this, but have not had a chance to mess with it.

With the timing control arrangement, it is a "simple matter" to interupt the CAS signal going to the ECU, which would stop fuel and spark. The issue related to this is that fuel and spark delivery happen at different times, and the cylinder cutout may not be 'smooth'.

Something to work on...

Bob

[TurboBob]

Here is the latest. Tip-in is improved a little over 5.00

Also the BIN I have been driving for a couple days. Its a quick tune using the user-loaded VE table feature, all tunes are set to 0 except a little air temperature compensation at the hot end.

My car is basically a stock fuel, 13G setup.

[mightymoose]

I tried searching, but with no luck Im starting to get a cel of 50.. what is that. having no luck finding a table with the cel codes to find out, I found everything but and error code of 50,,my 92 VR4 in SD mode has ran like a champ, now runs crap..

any help would greatly be appreciated

thanks
James G

[gearheadvr4]

Got everything together with the LC-1 wideband output 2 hooked to the maft pro and output 1 hooked to the egrt for the mmcd. The readings are pretty close. Thanks for the help on that turbobob.

Do have an issue though. I have tried calibrating several times but to no avail. After I blip the throttle (from idle) the AFR readings are all over the place. Usually runs up to 18-20 AFR then settles back to ~14. Also the RPMS drop way low to about 400 and the car tries to die. Most of the time it recovers but sometimes not. I haven't drove it far with these settings since I don't feel I have a reliable AFR reading and the car sputters out after shifting.

I lowered my fuel pressure to about 37 psi and set my mainscale to -40. If it's just sitting I can get it to read and AFR of about 14.5. I haven't done any other low, med, high adjustments yet. Just mainscale so far.

I'm still learning tuner pro and mmcd. Not sure yet how to record and post a log. If you think that would help i'll give myself a crash course and post something up.