LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

Another Bad Day At The Track! Help Please!!!

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Old Jul 29, 2010 | 10:13 PM
  #31  
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ACE1252 I just wanted to thank you for doing this for me i really appreciate it. Also thank you Injuneer your information has been very helpful.

But from looking at the excel file is it possible that the Injector Duty Cycle L is being messed up because of the oxygen sensor that is on that side? It looks like that sensor isn't working at all.
Old Jul 30, 2010 | 01:32 PM
  #32  
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This datalog is just me driving back from the store under normal driving conditions. I think my left O2 sensor is messed up. If anyone sees anything funny please let me know.

http://www.quickfilepost.com/downloa...7ac973bccdecec

Last edited by pboxfun; Jul 30, 2010 at 01:45 PM.
Old Jul 30, 2010 | 01:55 PM
  #33  
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The right sensor is hovering around 450mV.... goes above and below once in a while. But its not moving the way it should. The long term and short term corrections are locked at 128 on the right side. Appears there is a problem with the right sensor.

The left sensor appears to have the normal range of voltage changes, but the PCM is seeing a lean condition, and has bumped the long term up to the 150's at the end of the log where its sitting and idling in Cell 16.

Both sides of the engine appear to be screwed up.

You have two events of knock retard, and they are both triggered by knock count increases, possibly not by the knock sensor. In the first one, the engine is under steady load, nothing is changing, and all of a sudden knock counts jump up and you get 4deg of retard. Second event comes just after the trans had completed an upshift. Samd thing... knock counts increment and 4deg of retard.
Old Jul 30, 2010 | 02:29 PM
  #34  
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Well that's even worse now...both of them are bad lol I think I'm gunna go out there and try wiggling the O2 sensors and see if its just an electrical maybe something is intermittent. If not i guess I've got to replace the both of them :/ DO you think the issue of both sides of the engine being messed up is because of the O2s or something else?

Also I think i'm going to try to tune out the knock sensor or try to desensitize it.
Old Jul 30, 2010 | 06:45 PM
  #35  
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You should consider larger injectors. Ford 30lbers would do you good.
Old Jul 30, 2010 | 10:15 PM
  #36  
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Originally Posted by LearJet
You should consider larger injectors. Ford 30lbers would do you good.
What makes you think that? I'm just trying to figure out whats going on.
Old Aug 6, 2010 | 02:50 PM
  #37  
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Well I just replaced both my O2 sensors. And here is what my car says now from dataloging it. First one is my car at WOT the second is just normal driving conditions.

http://www.quickfilepost.com/downloa...c8ed812b272806

http://www.quickfilepost.com/downloa...f125cf2e8911a4
Old Aug 8, 2010 | 11:06 PM
  #38  
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So finally good news!! Figured out what was wrong with my car!! Turns out #1 Injector connector was not hooked up!!!
SO a hour later after figuring this out today I went to the track lol
This is what I ran

R/T .295
60' 1.873
330 5.454
1/8 8.454
MPH 81.78
1000 11.043
1/4 13.221
MPH 103.75

Not bad especially since I dropped a second! But I would Like to get into the 12s now.
I was able to datalog this run. Anyones comments or suggestion would be greatly appreciated.


http://www.quickfilepost.com/downloa...24d7e2f910cb69
Old Aug 9, 2010 | 07:13 AM
  #39  
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Originally Posted by pboxfun
So finally good news!! Figured out what was wrong with my car!! Turns out #1 Injector connector was not hooked up!!!
SO a hour later after figuring this out today I went to the track lol
This is what I ran

R/T .295
60' 1.873
330 5.454
1/8 8.454
MPH 81.78
1000 11.043
1/4 13.221
MPH 103.75
I'm thinking that might not be all that was wrong -- your MPH is just barely faster than what a bone stock LT1 should run.
Old Aug 10, 2010 | 07:35 AM
  #40  
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Originally Posted by pboxfun
So finally good news!! Figured out what was wrong with my car!! Turns out #1 Injector connector was not hooked up!!!
SO a hour later after figuring this out today I went to the track lol
This is what I ran

R/T .295
60' 1.873
330 5.454
1/8 8.454
MPH 81.78
1000 11.043
1/4 13.221
MPH 103.75

Not bad especially since I dropped a second! But I would Like to get into the 12s now.
I was able to datalog this run. Anyones comments or suggestion would be greatly appreciated.


http://www.quickfilepost.com/downloa...24d7e2f910cb69
Originally Posted by JakeRobb
I'm thinking that might not be all that was wrong -- your MPH is just barely faster than what a bone stock LT1 should run.
Yes. Something else is still going on. You're definitely on the right track though. My '97 has nothing but bolt-on's, gears included, but no stall and I ran a 13.40 @ 102 just two weeks ago. And I still have a stock cam.
Old Aug 10, 2010 | 08:01 AM
  #41  
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Originally Posted by pboxfun
So finally good news!! Figured out what was wrong with my car!! Turns out #1 Injector connector was not hooked up!!!
SO a hour later after figuring this out today I went to the track lol
This is what I ran

R/T .295
60' 1.873
330 5.454
1/8 8.454
MPH 81.78
1000 11.043
1/4 13.221
MPH 103.75

Not bad especially since I dropped a second! But I would Like to get into the 12s now.
I was able to datalog this run. Anyones comments or suggestion would be greatly appreciated.


http://www.quickfilepost.com/downloa...24d7e2f910cb69
Just curious... did you have any head work done?
What valve springs are you running?
What is the trans shifting at?
Old Aug 11, 2010 | 01:51 PM
  #42  
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My 94 6speed with all bolt-ons ran consistent 13.3's @ 105. Best was a 13.05 with same MPH. 1.8 60fts on average.
Old Oct 20, 2010 | 06:02 PM
  #43  
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No I never had any head work done on it.
I'm using Bullet Springs
It's shifting at 6100 rpms

It was also picking 4* of false knock. Do you think that could be causing it to not do as well? Also if I raise the shift point up will it help??
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