---===The Official MAFT-Pro Thread===--- - Page 18 - 3000GT/Stealth International Message Center

runner4053 · 09-19-2005, 09:41 PM

Bob's worked.

Rustang's and Bob's diagram also differ on pinouts for power and ground. I think they both work though.

Well, I now have TPS, RPM, and AFR. Yipee. Now for the fun stuff, drilling and tapping.

Toni · 09-22-2005, 10:44 AM

A couple of questions when using AFR tracking. What is meant by the gain and the correction factor?

Right now I have my gain set for 20. What exactly does the number 20 mean? what number is "instant" correction?

for CF, without any correction it displays 100. When I'm going WOT, I see the number climb to 108ish range. What does that number mean and what are the "units" of it?

Thanks,
Antoni

TurboBob · 09-22-2005, 10:56 AM

Quote:

Originally Posted by Toni

A couple of questions when using AFR tracking. What is meant by the gain and the correction factor?

Right now I have my gain set for 20. What exactly does the number 20 mean? what number is "instant" correction?

for CF, without any correction it displays 100. When I'm going WOT, I see the number climb to 108ish range. What does that number mean and what are the "units" of it?

Thanks,
Antoni

Good questions,

The way the AFR tracking works is basically this:

If the actual A/F is not the same as the desired, the difference is multiplied by the gain and the result is added to (or subtracted from) the correction factor.

The correction factor is %, 100% means no correction. 108 means that 8% is being added to the airflow signal to bring the A/F up to match the desired.

Higher than 20 gain is probably not necessary. Instant correction is not possible because (in part) of the lagtime from the airflow signal to the A/F reading. Too much gain will cause instability and overshoot. 20 Gain has worked really well in my experience.

Sounds like things are shaping up well.

Bob

runner4053 · 09-23-2005, 02:25 PM

Everything's installed. My car runs badly for a moment and then dies. It's kind of a sad sputtering if i step on the gas enough to keep it running. Lot's of smoke out the exhaust. On the setup screen I'm not sure what to put in for V-Out1 Set. the instructions say for 75 degrees but the number given is like 4.0 ish. all my other setups are as listed on the sheet.

Rustang Cobra · 09-23-2005, 02:37 PM

set that to 2.5v

it shouldn't affect your tune though, it should just throw a CEL

what size injectors are you using? what mainscale?

runner4053 · 09-23-2005, 03:07 PM

stock injectors, mainscale zero. I just put all the connectors back to stock, now the car won't start. It did this before when the spark plugs fouled out.

Rustang Cobra · 09-23-2005, 03:12 PM

is it cranking at least?

runner4053 · 09-23-2005, 03:34 PM

It cranks. All of my sparkplugs are pitchblack. They're fouled out. This has happend before, like 3-4000 miles ago, so I don't think it has anything to do with the maftpro. I have to go buy some new ones and replace them before I move on with this some more.

TurboBob · 09-23-2005, 08:43 PM

I'm here also. When you are ready to re-fire lets go thru the setup again.

Check your sensor readings as well.

Bob

scottandrew10 · 09-23-2005, 08:47 PM

hey turbo bob is there anyway you could give me a call and walk me through setting up the maftpro tonight.
i tryin to find a few things out on here but i know you'd be alot better.

if you can and dont mind please give me a ring
859-509-1929
scott

09-19-2005, 09:41 PM	#171 (permalink)
runner4053 the car whisperer Join Date: May 2003 Location: Univ. of Illinois Drives: 96 RT/TT Trader Rating: (4)	Re: ---===The Official MAFT-Pro Thread===--- Bob's worked. Rustang's and Bob's diagram also differ on pinouts for power and ground. I think they both work though. Well, I now have TPS, RPM, and AFR. Yipee. Now for the fun stuff, drilling and tapping. __________________ 96 RT/TT Currently missing an engine. major performance mods: DR650's, MAFT-PRO speed density, 720 cc, supra pump with hotwire, Fuellab FPR, ported heads, 1mm over intake and 1 mm over iconel exhaust valves. spec 3+ clutch, fidenza flywheel, 2 piece Al driveshaft, Supercar baffled oil pan, relocated battery, custom exhaust, reinforced bellhousing, 3sx poly motor mounts, intrax with GR-2, lots' of little things. Waiting to get put in---> DR1000s with .48AR and stage 2 blade

09-23-2005, 02:25 PM	#174 (permalink)
runner4053 the car whisperer Join Date: May 2003 Location: Univ. of Illinois Drives: 96 RT/TT Trader Rating: (4)	Re: ---===The Official MAFT-Pro Thread===--- Everything's installed. My car runs badly for a moment and then dies. It's kind of a sad sputtering if i step on the gas enough to keep it running. Lot's of smoke out the exhaust. On the setup screen I'm not sure what to put in for V-Out1 Set. the instructions say for 75 degrees but the number given is like 4.0 ish. all my other setups are as listed on the sheet.

09-23-2005, 02:37 PM	#175 (permalink)
Rustang Cobra I think my cars drunk... Join Date: Jul 2003 Location: Lexington, MA Drives: girls crazy Trader Rating: (31)	Re: ---===The Official MAFT-Pro Thread===--- set that to 2.5v it shouldn't affect your tune though, it should just throw a CEL what size injectors are you using? what mainscale? __________________ 2003 Nissan 350z - New toy 1993 Stealth Twin Turbo - Sold Old Dyno w/15gs- 404awhp/398awtq @17psi mustang dyno - SOLD 1998 Mustang cobra - RIP Dyno 275rwhp/278rwtq 92 Honda Civic CX Hatchback - Winter beater

09-23-2005, 03:07 PM	#176 (permalink)
runner4053 the car whisperer Join Date: May 2003 Location: Univ. of Illinois Drives: 96 RT/TT Trader Rating: (4)	Re: ---===The Official MAFT-Pro Thread===--- stock injectors, mainscale zero. I just put all the connectors back to stock, now the car won't start. It did this before when the spark plugs fouled out.

09-23-2005, 03:12 PM	#177 (permalink)
Rustang Cobra I think my cars drunk... Join Date: Jul 2003 Location: Lexington, MA Drives: girls crazy Trader Rating: (31)	Re: ---===The Official MAFT-Pro Thread===--- is it cranking at least?

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09-23-2005, 03:34 PM	#178 (permalink)
runner4053 the car whisperer Join Date: May 2003 Location: Univ. of Illinois Drives: 96 RT/TT Trader Rating: (4)	Re: ---===The Official MAFT-Pro Thread===--- It cranks. All of my sparkplugs are pitchblack. They're fouled out. This has happend before, like 3-4000 miles ago, so I don't think it has anything to do with the maftpro. I have to go buy some new ones and replace them before I move on with this some more.

09-23-2005, 08:43 PM	#179 (permalink)
TurboBob Resident mad scientist Join Date: Jan 2003 Location: Near Detroit Drives: 86 GN 91 RT/TT Trader Rating: (15)	Re: ---===The Official MAFT-Pro Thread===--- I'm here also. When you are ready to re-fire lets go thru the setup again. Check your sensor readings as well. Bob

09-23-2005, 08:47 PM	#180 (permalink)
scottandrew10 Forum Member Join Date: Mar 2003 Location: Lexington, KY Drives: stealthTT,VR-4,350Z Trader Rating: (10)	Re: ---===The Official MAFT-Pro Thread===--- hey turbo bob is there anyway you could give me a call and walk me through setting up the maftpro tonight. i tryin to find a few things out on here but i know you'd be alot better. if you can and dont mind please give me a ring 859-509-1929 scott

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