---===The Official MAFT-Pro Thread===--- - Page 223 - 3000GT/Stealth International Message Center

Spyder95 · 07-27-2007, 09:48 PM

Seened to locate the source of the changing idle condition to the small plug when it was touched or wiggled. Took the MAFT-Pro apart, examined the solder joints on the board - everything looked solid. Then I found a filiment of wire sticking out of one of the pins in the smaller connector, could have been shorting out on an adjacent pin. Removed the wire, reassembled, plugged it back in, and found the idle will now mess up if I wiggle the larger connector. I bumped the idle limit screw up so the thing will not *usually* die on me, about 0.78 TPS. The idle fluctuates pretty bad for a few minutes, then gets fairly smooth at 1100 RPM. It is so bad when cold that it will drop to 400 and go back up to 1300, over and over. Some times it will start doing it out of the blue, even when warm. Would you suggest soldering the wires directly to the board? Any ideas on what causes the fluctuating idle?

TurboBob · 07-27-2007, 10:29 PM

Try unplugging and re-plugging the connectors about 10 times.

Bob

stealthystu · 07-27-2007, 10:34 PM

My car has bad initial start conditions when I turn it on when it's already warm (if I had driven it within 15-60 minutes prior), but it was like that stock too, so it may just be the way the car is.

TurboBob · 07-27-2007, 10:51 PM

Mine too,

I add a little extra afterstart to cover the lean restart. My idle RPM is low on restarts as well, not sure how to fix that...... (perhaps using the fuel pressure solenoid to create a vacuum leak to raise the idle speed.)

1fastvr4 · 07-28-2007, 07:06 AM

Hey Bob,

I have my car tuned and running pretty well except for one thing. If I touch the gas pedal within the first few minutes after starting the car it wants to go extremely rich and die and I can't hardly get it started. I usually have to hold the pedal wide open and crank the car over for a while to get it to start. Once it is warmed up it runs GREAT!
I have the afterstart set at 0 so I know that it is not that. Can you point me in the right direction?

P.S. Joshua (from Colorado with the Porche 944) is helping me with the tuning.

Thanks,
Dean

stealthystu · 07-28-2007, 05:02 PM

Quote:

Originally Posted by 1fastvr4

Hey Bob,

I have my car tuned and running pretty well except for one thing. If I touch the gas pedal within the first few minutes after starting the car it wants to go extremely rich and die and I can't hardly get it started. I usually have to hold the pedal wide open and crank the car over for a while to get it to start. Once it is warmed up it runs GREAT!
I have the afterstart set at 0 so I know that it is not that. Can you point me in the right direction?

P.S. Joshua (from Colorado with the Porche 944) is helping me with the tuning.

Thanks,
Dean

I've read the first 155 pages of this thread along with many sections there after. Bob says Mitsubishi's like an afterstart between 10 and 15. Give that a try and see if it helps.

1fastvr4 · 07-28-2007, 07:12 PM

Quote:

Originally Posted by stealthystu

I've read the first 155 pages of this thread along with many sections there after. Bob says Mitsubishi's like an afterstart between 10 and 15. Give that a try and see if it helps.

Afterstart richens up the car and I am already having a very rich problem (and only when cold).

Thanks,
Dean

SuperchargedWS6 · 07-28-2007, 08:43 PM

Hi, I'm adding my all in one AEM wideband to my maft pro tomorrow. I was curious where everyone grounded their wideband and if it read the same as the the maftpro.

It seems to me that the maftpro and the wideband would have to be grounded in the exact same place, so the voltage reference is the same. If not, they could read different, resulting in the maft pro not reading the correct AFR.

stealthystu · 07-28-2007, 09:22 PM

Quote:

Originally Posted by 1fastvr4

Afterstart richens up the car and I am already having a very rich problem (and only when cold).

Thanks,
Dean

Though I've read alot of the thread, I am still new to tuning the pro, but it seems to me that you may consider either adjusting your low tune rpm's at 800 and 1200 to lean that out, or adjust the temperature input (though I'm still not too clear on that, so leave that for last)

stealthystu · 07-28-2007, 09:28 PM

I just put the boost controller on, which I'm pretty excited about, but I am having issues with my boost (as I've read a few other people have had). Here's my settings.

TPS Spool: 1.26
RPM Spool: 2500 ish
TPS Start: 3.88
PSI Start: 10
DC% Start: 57.2
PSI Set: 14
PSI Aux: 0
Gain: 17.2

Here's my issue. It started out not getting past 10 pounds, when I had dc% at 22ish and gain at 15. I started turning up the DC% start cause I read to turn it up until boost hits what I want. Now it gets to 14, but drops to 7 and holds. I raised my gain to 17.2 with little effect. I don't know that moving my gain or DC% start any higher is really what I want. Do any other numbers jump out as being wrong? If not what should I do to adjust?

07-27-2007, 09:48 PM	#2221 (permalink)
Spyder95 Spyder95 - Palatine IL Join Date: Aug 2005 Location: Palatine, IL Drives: WIDE OPEN Trader Rating: (1)	Re: ---===The Official MAFT-Pro Thread===--- Seened to locate the source of the changing idle condition to the small plug when it was touched or wiggled. Took the MAFT-Pro apart, examined the solder joints on the board - everything looked solid. Then I found a filiment of wire sticking out of one of the pins in the smaller connector, could have been shorting out on an adjacent pin. Removed the wire, reassembled, plugged it back in, and found the idle will now mess up if I wiggle the larger connector. I bumped the idle limit screw up so the thing will not usually die on me, about 0.78 TPS. The idle fluctuates pretty bad for a few minutes, then gets fairly smooth at 1100 RPM. It is so bad when cold that it will drop to 400 and go back up to 1300, over and over. Some times it will start doing it out of the blue, even when warm. Would you suggest soldering the wires directly to the board? Any ideas on what causes the fluctuating idle? __________________ MY OTHER 'CAR' RIDES 1 INCH ABOVE THE TRACK 1995 Caracas Red Spyder VR-4 60,961 miles; 14.2@4050 lbs (when stock-2006 3SNG). Mods: Pioneer FHP-4200MP, Whistler radar detector, Taylor wires, Iridium plugs, Redline Water Wetter, AvBlend, General Exclaim UHPs, Mirage datalogger, $ach$ clutch, ATE Super Blue fluid, Axxis Ultimate (f) SBS ProTrack (r) pads, 3SX speed bleeders, R1C slotted/drilled rotors, custom air filter, Forge BOV, TomTom300 GPS, Scosche interior antenna, PLX wideband, Moates O-Meter, NG Extreme AGM battery, Tsunami nickel terminals, StealthRTSC lighted door handles, MAFT-Pro Speed Density, Single Wiper, Stillen DP, Walbro FP, (installing soon?); Plans: FP hotwire, 580CC Inj.,'99 lifters, remote top controller. Other rides: 99 Tahoe; 97 Cutlass; 99 Malibu; 71 Lancer/Mc 91-B; 99 BRM DK3/HPV, 04 RBI/PRD Fireball TaG CIK Enduro

07-27-2007, 10:29 PM	#2222 (permalink)
TurboBob Resident mad scientist Join Date: Jan 2003 Location: Near Detroit Drives: 86 GN 91 RT/TT Trader Rating: (17)	Re: ---===The Official MAFT-Pro Thread===--- Try unplugging and re-plugging the connectors about 10 times. Bob __________________ Need a datalogger? Check out the Scanmaster 3 PM me about ECU mods for 8000+ RPM rev limits !!!!!!!! Stock = 7300 RPM Stage 1 = 8060 RPM Stage 2 = 8200 RPM Stage 3 = 8400 RPM Stage 4 = 8800 RPM (By request only) 1991 Stealth RT/TT, Grooms Shortblock, 13G's. My Stealth is for sale, 65000 miles, runs perfectly. $6,500 (a bargain)

07-27-2007, 10:34 PM	#2223 (permalink)
stealthystu Excitable at high speeds Join Date: Aug 2006 Trader Rating: (8)	Re: ---===The Official MAFT-Pro Thread===--- My car has bad initial start conditions when I turn it on when it's already warm (if I had driven it within 15-60 minutes prior), but it was like that stock too, so it may just be the way the car is. __________________ She's my little duece coupe....You don't know, what I got...

07-27-2007, 10:51 PM	#2224 (permalink)
TurboBob Resident mad scientist Join Date: Jan 2003 Location: Near Detroit Drives: 86 GN 91 RT/TT Trader Rating: (17)	Re: ---===The Official MAFT-Pro Thread===--- Mine too, I add a little extra afterstart to cover the lean restart. My idle RPM is low on restarts as well, not sure how to fix that...... (perhaps using the fuel pressure solenoid to create a vacuum leak to raise the idle speed.)

07-28-2007, 07:06 AM	#2225 (permalink)
1fastvr4 Senior Member Join Date: Feb 2000 Location: Westminster, CO Drives: 1994 3000gt VR4 Trader Rating: (9)	Re: ---===The Official MAFT-Pro Thread===--- Hey Bob, I have my car tuned and running pretty well except for one thing. If I touch the gas pedal within the first few minutes after starting the car it wants to go extremely rich and die and I can't hardly get it started. I usually have to hold the pedal wide open and crank the car over for a while to get it to start. Once it is warmed up it runs GREAT! I have the afterstart set at 0 so I know that it is not that. Can you point me in the right direction? P.S. Joshua (from Colorado with the Porche 944) is helping me with the tuning. Thanks, Dean __________________ 1994 Black 3000GT VR4 w/only 39,800 miles: IPS thermal coated headers, o2 housings, and EVO 3 16g turbos, Dynamic Racing Stage 3 heads, Fidenza cam gears, UDP, RPS flywheel, Weisco forged and coated pistons, Dejon tool intake pipes. Alamo intercoolers (bigger than HKS), DN hardpipe kit, DN y-pipe and downpipe, HKS SSBOV, Extrude-honed upper and lower plenum, 780 PTE injectors, MAFT Pro in speed density mode, HKS Hotwired fuel pump, Kenne bell boost-a-pump, AEM FPR w/gauge, Greddy turbo timer, HKS 3" Super Drager Exhaust w/5" single tip, Greddy Profec A boost controller, ARM1 air/fuel gauge, ACT 2600 clutch, Eibach 1" lowering springs, Brembo front calipers, Greddy peak hold white faced gauges including boost, water temp, oil pressure, (2)EGT's, and oil temp, PLX300 wide band, SMC Alcohol injection system. PST 2 piece Carbon fiber drive shaft.

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07-28-2007, 08:43 PM	#2228 (permalink)
SuperchargedWS6 Forum Member Join Date: Nov 2005 Trader Rating: (1)	Re: ---===The Official MAFT-Pro Thread===--- Hi, I'm adding my all in one AEM wideband to my maft pro tomorrow. I was curious where everyone grounded their wideband and if it read the same as the the maftpro. It seems to me that the maftpro and the wideband would have to be grounded in the exact same place, so the voltage reference is the same. If not, they could read different, resulting in the maft pro not reading the correct AFR. __________________ ------------------------------- Brent M. 1995 3000GT Twin Turbo - It's running! Mod list soon! 1998 Dakota V8 4x4, 4 the winter Wife's car - Lost the wife due to all the time/money spent on the VR4! At least she didn't get the car! Mitsubishi - My Life's Work!

07-28-2007, 09:28 PM	#2230 (permalink)
stealthystu Excitable at high speeds Join Date: Aug 2006 Trader Rating: (8)	Re: ---===The Official MAFT-Pro Thread===--- I just put the boost controller on, which I'm pretty excited about, but I am having issues with my boost (as I've read a few other people have had). Here's my settings. TPS Spool: 1.26 RPM Spool: 2500 ish TPS Start: 3.88 PSI Start: 10 DC% Start: 57.2 PSI Set: 14 PSI Aux: 0 Gain: 17.2 Here's my issue. It started out not getting past 10 pounds, when I had dc% at 22ish and gain at 15. I started turning up the DC% start cause I read to turn it up until boost hits what I want. Now it gets to 14, but drops to 7 and holds. I raised my gain to 17.2 with little effect. I don't know that moving my gain or DC% start any higher is really what I want. Do any other numbers jump out as being wrong? If not what should I do to adjust?

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HOW TO INSTALL MAFTPRO ON A 91-99 3000GT VR4/91-96 STEALTH TT	This thread	Refback	04-13-2008 01:45 AM