Data logging for a '96 OBDII
Registered User
Joined: Jul 2004
Posts: 77
From: West Coast
Re: Data logging for a '96 OBDII
Originally Posted by 99vette
Thanks for the info....I'm new to this computer tuning/diagnostics and still learning what these scanner readings mean. My car is a 96 LT4 Vette. The Engine was just rebuilt, displacement increased to 355,Hotcam,30# injectors,52MM TB, LTCC, Long tubes,ported heads,stock MAF,no cats and ED wright tune.
I also recently purchased the LT1 edit software in order to do my own tweeking however I discovered afterward that I can't read or edit ED's tune because he locks them out some kind of way.
My short terms read 50% and other problems include some knock retard at idle through the entire RPM band even with 100 race fuel. engine stumbles at WOT and when returning to idle.
I also recently purchased the LT1 edit software in order to do my own tweeking however I discovered afterward that I can't read or edit ED's tune because he locks them out some kind of way.
My short terms read 50% and other problems include some knock retard at idle through the entire RPM band even with 100 race fuel. engine stumbles at WOT and when returning to idle.
If the STFTs are that high, either he set the injector flow or MAF tables wrong or some type of leak.
If both sides have the same trim values look for the injector value being tuned wrong or a airflow issue.
Also you need to see if he tuned so that car is stuck in a open loop, PE mode via the scanner.
Also look at the injector pulse width, if its that lean the injectors would have large mSec times or the fuel delivery sytem is at fault.
Sorry to say but you might be better off demanding wright unlock your PCM and starting over with a GM calibration and have someone really custom tune for your engine makeup.
Registered User
Joined: Sep 2004
Posts: 25
Re: Data logging for a '96 OBDII
Originally Posted by Team ZR1
Well that changes a lot when you say who tuned it :-(
If the STFTs are that high, either he set the injector flow or MAF tables wrong or some type of leak.
If both sides have the same trim values look for the injector value being tuned wrong or a airflow issue.
Also you need to see if he tuned so that car is stuck in a open loop, PE mode via the scanner.
Also look at the injector pulse width, if its that lean the injectors would have large mSec times or the fuel delivery sytem is at fault.
Sorry to say but you might be better off demanding wright unlock your PCM and starting over with a GM calibration and have someone really custom tune for your engine makeup.
If the STFTs are that high, either he set the injector flow or MAF tables wrong or some type of leak.
If both sides have the same trim values look for the injector value being tuned wrong or a airflow issue.
Also you need to see if he tuned so that car is stuck in a open loop, PE mode via the scanner.
Also look at the injector pulse width, if its that lean the injectors would have large mSec times or the fuel delivery sytem is at fault.
Sorry to say but you might be better off demanding wright unlock your PCM and starting over with a GM calibration and have someone really custom tune for your engine makeup.
I've been very unsatisfied Ed's tune and service. I searched thoughly for any intake and/or exhaust leaks. I'm convinced the problem is in the tune even though John at Ed's claims the tune is good, problem is mechanical.
I had Bryan at PCMforless email me a new tune. He said all I have to do is load his tune and it will overwrite Ed's, I'm just waiting for the PCMCIA serial card adapter to come in for my laptop. Hopefully Bryans tune will get me real close or if not at least his can be tweeked.
Last edited by 99vette; Nov 4, 2004 at 02:37 PM.
Registered User
Joined: Mar 2004
Posts: 643
From: St. Charles, IL
Re: Data logging for a '96 OBDII
Originally Posted by 99vette
I'll check with the people at Autotap. I was thinking 0%= 128
Anyway. Good luck getting any answers from autotap
B&B electronics, the company that hosts autotap. They are a real pain to deal with.
Registered User
Joined: Sep 2004
Posts: 25
Re: Data logging for a '96 OBDII
Originally Posted by Team ZR1
Well that changes a lot when you say who tuned it :-(
If the STFTs are that high, either he set the injector flow or MAF tables wrong or some type of leak.
If both sides have the same trim values look for the injector value being tuned wrong or a airflow issue.
Also you need to see if he tuned so that car is stuck in a open loop, PE mode via the scanner.
Also look at the injector pulse width, if its that lean the injectors would have large mSec times or the fuel delivery sytem is at fault.
Sorry to say but you might be better off demanding wright unlock your PCM and starting over with a GM calibration and have someone really custom tune for your engine makeup.
If the STFTs are that high, either he set the injector flow or MAF tables wrong or some type of leak.
If both sides have the same trim values look for the injector value being tuned wrong or a airflow issue.
Also you need to see if he tuned so that car is stuck in a open loop, PE mode via the scanner.
Also look at the injector pulse width, if its that lean the injectors would have large mSec times or the fuel delivery sytem is at fault.
Sorry to say but you might be better off demanding wright unlock your PCM and starting over with a GM calibration and have someone really custom tune for your engine makeup.
It appears Ed has my injectors set too high. I have Bosch 30#'s and he has my injector size set at 7.764 gm/s.
Registered User
Joined: Sep 2004
Posts: 25
Re: Data logging for a '96 OBDII
Originally Posted by Team ZR1
If you mean the injector flow table the values should be somewhere around 4.xx
7.xx would be a much larger injector
7.xx would be a much larger injector
Last edited by 99vette; Nov 16, 2004 at 05:06 PM.
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