Another Bad Day At The Track! Help Please!!!
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From: Southern Maryland
Ok i'm in the progress of trying to figure out everything I need to get to datalog my car. I know I need the cable for my laptop to hook up to my car. But what programs should I get? So far I herd of getting CATS, Scanmaster, Datamaster. I'm new to this so any help would be great!
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From: North Versailles, PA
Before getting too far into this I would call where you got the tune and ask if any adjustments were made to the knock module sensitivity. If nothing was done in the tune (i would do it either way anyway) get the LT4 knock module. If timing is being pulled in high rpm I would say that is the problem. The stock knock module will sense knock from simple bolt-ons like long tube headers or roller rockers. A cam will for sure cause knock. Try that and post results. Mine was only $35 from the dealership. It has been worth every penny.
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From: Ahead of your front bumper
You dont need the LT4 module. It wont be near as effective as the AR gets re-adjusted, again, so long as it is NOT real KR. Either way, both methods seldom will save your motor, if it is real.
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From: North Versailles, PA
No offense but if the stock KM is too sensitive for bolt-ons why would you want to keep it on a cammed motor? I had knock retard with just long tubes. The LT4 KM was my only change (no additional tuning or anything) and problem solved. I ran a 12.9 shortly after fixing this (13.4 before). Anyone can say what they feel is right but others may have luck on something that seems dumb. Again, no harm intended in this post. I'm just stating what works for me.
Real knock is when the charge ignites on the upstroke of the piston. (BAD) AKA pre ignition
There are 2 reasons you would have knock retard
1. Real knock
2. False knock
All of this is achieved by a small microphone (knock sensor) that is on the side of the engine.
This info is then processed by the knock module. (2 types)
1. LT1 knock module
2. LT4 knock module (less sensitive)
If you have a exhaust leak, tapping, really noisy rockers etc, you can have false knock.
The range of the sensor should be adjusted by computer programming, along with timing, but the only real way to not do this blindly is by taking a log of the engine parameters.
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From: Ahead of your front bumper
No offense but if the stock KM is too sensitive for bolt-ons why would you want to keep it on a cammed motor? I had knock retard with just long tubes. The LT4 KM was my only change (no additional tuning or anything) and problem solved. I ran a 12.9 shortly after fixing this (13.4 before). Anyone can say what they feel is right but others may have luck on something that seems dumb. Again, no harm intended in this post. I'm just stating what works for me.
Last edited by BackinBlackZ; Jul 26, 2010 at 12:31 PM.
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From: North Versailles, PA
None take'n! People run what ever floats there boat, cammed or not. Thats why there is disparity between all F-body's performances. Some people know tuning and others dont. Do you know at what rate your module is set at?.....(at)recovery is more crutial to others at the track then others.
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From: Ahead of your front bumper
See if your tuner can send you a copy of your tunes bin file. Then you can send me a copy to review. Scanning your Z will clue you in immediately. Your Z does sound like it's still out of tune. Was your tune mail order (generic)? or dyno-celled specific?
Last edited by BackinBlackZ; Jul 27, 2010 at 11:29 AM.
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This is what ion sent me "Did you check your fuel pressure at full throttle? Is it constant at 43.5 PSI? This is a major power loss, so it could be related to transmission slip still or lack of adequate fuel pressure."
My question is whats the best way to check the fuel pressure at full throttle??
My question is whats the best way to check the fuel pressure at full throttle??
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Well I finally got a chance to datalog my car and this what I got. Not sure if I did this right it hat my 1st time doing this. Any help would be great.
Both runs were done on the street with street tires.
Both runs were done on the street with street tires.
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From: Ahead of your front bumper
....basic parameters, not what you need however, though I see nothing standing out. I need actual run-file for fueling, timing, engine load, KR, temp., MAF, etc! Create freeze frame option during open and close loop, then save file. Reformat, then post!