Upgraded to MAFT-Pro 4.80; car runs like crap...

[Supra87T]

Ok, I updated my 1987 Supra Turbo to 4.80 from 4.40. I updated all of the settings per the quick setup guide, I really haven't changed any other variable yet. Now the cars idle jumps up and down between about 650 and 900 or so. Also, when I try and let out the clutch it wants to die unless I give more gas and it also just is bogged down when I try to drive it. Did I do something wrong? Also, I tried to flash it back to 4.40 after this with the same symptoms. Anything I should try to get the car running smoothly?

 

[drjonez]

chances are your 4.4 settings aren't playing well with 4.8.....and then the flash back to 4.4 didn't help because the 4.8 settings didn't translate well back to 4.4. hopefully you saved a .bin of your 4.4 settings before upgrading to 4.8...

 

[Doward]

After flashing to 4.80, I did a full reset of the MAFT-Pro, and then went back through my settings via the laptop.

Had it running smoother than ever

 

[Supra87T]

I got it fixed. I flashed it to 4.60 and reset all the settings and went back through and programmed it. Now it runs smoothly. No more hesitation when pressing the gas!

It seems like it has to relearn some of the values though. After programming it it was idling funny, I let it idle for about 10 min and then drove it and and all was well after that.

 

[Doward]

Remember the MAFT-Pro is still a piggyback, so the stock TCCS WILL compensate. Are you logging your Vf signal? How's it look?

 

[Supra87T]

It's reading around 0.00 volts usually. When letting off the throttle it will read about 2.00v or so. I know I could benefit from leaning it out a bit.

Is the best way to do that through the low, mid, and high tune pages?

 

[drjonez]

yups.

log Vf and AFR, then make corrections accordingly. satisfy Vf for closed loop operation, then tune WOT.

 

[Supra87T]

don't have a wideband as of yet, so i'll just have to monitor vf for now that's next on the list of purchases.

 

[drjonez]

tuning w/o a WB is giving a loaded gun to a 2 yr old....

 

[Supra87T]

that's why i haven't done it yet....