---===The Official MAFT-Pro Thread===--- - Page 243 - 3000GT/Stealth International Message Center

TurboBob · 09-17-2007, 12:05 PM

Quote:

Originally Posted by msassoon

I have a bit of a strange problem now. I have re-attached the supercharger, and now, PT Tracking does not seem to work for cruise or AFR Tracking for WOT. The cruise I have checked, and the TPS and RPM are in between the thresholds (TPS Max and RPM Max) and the wideband is connected with no O2 sensors, so this seems fine. Any ideas? Could a failing CAS cause this? I have replaced the TPS so far.

watch the AFR and TAF displays on the sensor page.

Is the proper wideband selected on the config page?

Its most likely not the CAS

B

msassoon · 09-18-2007, 02:54 AM

Ok, found it. The Cruise TPS was set to 0.7V! Not sure when that happened, but it seems fine. I still have a problem with idle though. It is staying within acceptable parameters, but it is a bit jumpy. I decreased the gain to 5 to stop the fluctuation, but this hasn't helped. My RPM changes from 700 to 900 rpm at idle and this seems to be causing some issues with AFR moving. Any ideas? Can I make the Pro less sensitive?

TurboBob · 09-18-2007, 07:12 AM

do some tuning with the low load page at idle to reduce the afr variation so the tracking doesn't have to chase it. The tracking at idle is very slow to begin with, so the tuning at idle needs to be decent to start with.

Bob

3000vr4tt · 09-18-2007, 10:17 PM

so i got the idle a little better and daily driving pretty good..so far im getting the hang of this thing. i still have a problem tho everytime i come to a stop usually the afr would be at 14 or 15 then raise to 16..17.3 then up to 18 and stay around 17 then later on drop down to 12 or 14

TurboBob · 09-19-2007, 11:41 AM

what version are you running? (remind me)

O2 sensors connected?

What VE table are you running? What happens sometimes is the O2 trims drop during a decel trying to lean out the fuel around 1200 RPM or so, when the idle RPM drops to 800 or so, the O2 trim is too low and you get a lean spot until the o2 trim recovers.

try unplugging the O2 sensors and see if it stops doing that. watch for a rich spot when lightly decelerating to a stop.

Your wideband working better?

Bob

3000vr4tt · 09-19-2007, 10:11 PM

ya it was the o2 sensor that was messed up so i got a new one. i think the version im runnin was 4.5 or 4.3 its a pain in the ass trying to upgrade to the new one. im horrible with this lap top it just doesnt connect with the pro maf. so i should disconnect both o2 and change anything else or just see if it gets any better?

xeudoxus · 09-19-2007, 11:42 PM

hey bob, is it possible to use the apexi avcr boost solenoid for the maft-pro?

-Matt

Patryn · 09-20-2007, 06:14 AM

Was it the wideband or narrowbands that were replaced. I have the exact same idle problem, rises up to past 17afr, dips to 10-12afr then back up or it bounces. Happens when the stock O2 sensors are plugged in and when they aren't.

TurboBob · 09-20-2007, 09:08 AM

Quote:

Originally Posted by 3000vr4tt

ya it was the o2 sensor that was messed up so i got a new one. i think the version im runnin was 4.5 or 4.3 its a pain in the ass trying to upgrade to the new one. im horrible with this lap top it just doesnt connect with the pro maf. so i should disconnect both o2 and change anything else or just see if it gets any better?

what exact verion are you running?

4.80 runs a bunch smoother. Its worth the pain.

TurboBob · 09-20-2007, 09:08 AM

Quote:

Originally Posted by xeudoxus

hey bob, is it possible to use the apexi avcr boost solenoid for the maft-pro?

-Matt

I have no clue.

What data do you have on that solenoid?

09-18-2007, 02:54 AM	#2422 (permalink)
msassoon Forum Member Join Date: May 2004 Location: Berkshire, England Drives: GTO SC ATX Trader Rating: (1)	Re: ---===The Official MAFT-Pro Thread===--- Ok, found it. The Cruise TPS was set to 0.7V! Not sure when that happened, but it seems fine. I still have a problem with idle though. It is staying within acceptable parameters, but it is a bit jumpy. I decreased the gain to 5 to stop the fluctuation, but this hasn't helped. My RPM changes from 700 to 900 rpm at idle and this seems to be causing some issues with AFR moving. Any ideas? Can I make the Pro less sensitive? __________________ Black 1991 Ripp Modds Supercharged GTO DOHC MAFT Pro running speed density. Erebuni front bumper and side skirts Racetech Exhaust. EK2 shorties and 3SX Downpipe Custom transmission and oil cooler Import Precision VLS doors 18" Chrome VR4 wheels and Chassis Dynamics Lowering springs '99 Sail panels Lightened crank pulley EK2 fuel rail adapter. Underbonnet bling Too much custom stuff to mention

09-18-2007, 07:12 AM	#2423 (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===--- do some tuning with the low load page at idle to reduce the afr variation so the tracking doesn't have to chase it. The tracking at idle is very slow to begin with, so the tuning at idle needs to be decent to start with. Bob

09-18-2007, 10:17 PM	#2424 (permalink)
3000vr4tt Forum Member Join Date: Jun 2004 Location: yonkers, ny Drives: 3kgt vr4 Trader Rating: (2)	Re: ---===The Official MAFT-Pro Thread===--- so i got the idle a little better and daily driving pretty good..so far im getting the hang of this thing. i still have a problem tho everytime i come to a stop usually the afr would be at 14 or 15 then raise to 16..17.3 then up to 18 and stay around 17 then later on drop down to 12 or 14

09-19-2007, 11:41 AM	#2425 (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===--- what version are you running? (remind me) O2 sensors connected? What VE table are you running? What happens sometimes is the O2 trims drop during a decel trying to lean out the fuel around 1200 RPM or so, when the idle RPM drops to 800 or so, the O2 trim is too low and you get a lean spot until the o2 trim recovers. try unplugging the O2 sensors and see if it stops doing that. watch for a rich spot when lightly decelerating to a stop. Your wideband working better? Bob

09-19-2007, 10:11 PM	#2426 (permalink)
3000vr4tt Forum Member Join Date: Jun 2004 Location: yonkers, ny Drives: 3kgt vr4 Trader Rating: (2)	Re: ---===The Official MAFT-Pro Thread===--- ya it was the o2 sensor that was messed up so i got a new one. i think the version im runnin was 4.5 or 4.3 its a pain in the ass trying to upgrade to the new one. im horrible with this lap top it just doesnt connect with the pro maf. so i should disconnect both o2 and change anything else or just see if it gets any better?

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09-19-2007, 11:42 PM	#2427 (permalink)
xeudoxus My KungFu Is Strong Join Date: Feb 2003 Location: West Plains, MO Drives: 1992 3000GT VR-4 Red Trader Rating: (4)	Re: ---===The Official MAFT-Pro Thread===--- hey bob, is it possible to use the apexi avcr boost solenoid for the maft-pro? -Matt __________________ Member #2275 RMG 2006 Pictures Best Time:1/4mile: 12.85 @ 101mph Engine:Crower Forged Rods, Ross Forged Pistons (.40 over), ARP Head Studs, Ported / Polished Heads, 60k Tune Up, EGR Plates, Vac Reduction, MSD Super 8.5mm Plug Wires, NGK Iridiums 1 Heat Range Colder Gapped @ .32, 3rd Gen Lifters, Apexi Blow-Off Valve, Fully Rebuilt Long Block. Exhaust:Modified OBX SS Downpipe 3" (With SS 8" Flex Section), Custom Catback 3" (With Flowmaster 80 Series 43083 Muffler, Dual Exit) and Brola Stainless Tips, Gutted Precats, Removed Main Cat. Interior:Custom Fiberglass Dash (With Center Channel Speaker), Custom Fiberglass Headliner (With Apexi AVC-R and S-AFC Pods), Custom Fiberglass/Aluminum A-Pillar (With 2 60mm Gauges), 2002 GM Rearview Mirror (With OnStar, Compass, and Outside Temp), Smokin's Brushed Aluminum Defrost Vents, Reverse EL Gauges. Body:Cross Drilled/Slotted Rotors Zinc Coated, Static Black Antenna, Center Mounted Sirius Antenna, 99 Rear Garnish, Front 25% Tint Rear 15% With 15% Eyebrow (Legal). Turbos:Rear 9b / Front 15g, DSM Sidemounts Fuel:PIR Aluminum Dual Pump Sending Unit, 450cc Injectors, Walbro 255lph Fuel Pump (Hot Wired), Ek2 Fuel Rail Loop, Ek2 Fuel Pressure Gauge. Drivetrain:Fidanza Lightweight Flywheel, New Stock Clutch/Pressure Plate, Fully Rebuilt Trans/TC - 25 Spline (By me ) Electronics/Audio:Maft-Pro SD, Apexi S-AFC-I, Apexi AVCR @ 1.20Bar, Apexi Turbo Timer, Clarion DXZ935 5.1 Headunit, Clarion 5 Disk CD-Changer, Clarion Siruis Unit w/ FREE Channels , Polk MOMO 6.5 Center Channel Speaker, 3 10" MTX 6000's (With Bandpass Box).

09-20-2007, 06:14 AM	#2428 (permalink)
Patryn Forum Member Join Date: Sep 1999 Location: Walnut Hill, FL. Esc Drives: 3000gt VR4 Trader Rating: (26)	Re: ---===The Official MAFT-Pro Thread===--- Was it the wideband or narrowbands that were replaced. I have the exact same idle problem, rises up to past 17afr, dips to 10-12afr then back up or it bounces. Happens when the stock O2 sensors are plugged in and when they aren't. __________________ 1998 VR4: SS Downpipe, Borla Cat-Back, Open Element Air Filter, ACPT CFDS, DN Intake Pipes, Front & Rear Strut Tower Bars, Deftracing 575 Hood, Blitz DSBC, Vacum Redution, Krank Vents, Titan Headers w/ Big TD05 16G Turbos,

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