Worse Performance after all bolt on

[acatlover13]

I'm actually seeing a similar problem with my car. Not quite as severe as the OP, but I have yet to match, let alone beat, my stock times.

Best Stock 1/8 mile: 8.45 @ 84.86 mph
Best Stock 1/4 Mile: 13.20@105.9 MPH

Best Since: 1/8 mile: 8.52 @ 86 mph, 1/4 mile: 13.32 @ 107

[danhr]

Originally Posted by acatlover13

I'm actually seeing a similar problem with my car. Not quite as severe as the OP, but I have yet to match, let alone beat, my stock times.

Best Stock 1/8 mile: 8.45 @ 84.86 mph
Best Stock 1/4 Mile: 13.20@105.9 MPH

Best Since: 1/8 mile: 8.52 @ 86 mph, 1/4 mile: 13.32 @ 107

You dont really have the same problem. You picked up trap speeds, which is a sign you are making more power. You are just getting off the line slower.

The OP's problem is that he lost ET time AND trap speed.

[acatlover13]

Originally Posted by danhr

You dont really have the same problem. You picked up trap speeds, which is a sign you are making more power. You are just getting off the line slower.

The OP's problem is that he lost ET time AND trap speed.

As I said, it is not to the same degree, but I do have similar 60 ft. times as pre-mod, therefore, not getting off the line slower. I am losing it between the 60 ft, and the 330 ft. (I'm able to run 1/8 mile more frequently than 1/4) That is where I'm seeing the drop off. Regardless of where the "drop off" is, you can understand why it would be frustrating to spend $2400 to "gain" 45 HP on the dyno, yet lose "performance."

[danhr]

Originally Posted by acatlover13

As I said, it is not to the same degree, but I do have similar 60 ft. times as pre-mod, therefore, not getting off the line slower. I am losing it between the 60 ft, and the 330 ft. That is where I'm seeing the drop off. Regardless of where the "drop off" is, you can understand why it would be frustrating to spend $2400 to "gain" 45 HP on the dyno, yet lose "performance."

How did the car look/what did it do when it left the line before?

same question for after the mods?

Does/did it bog or spin?

Was the nose coming down then coming back up?

If you spun, how much did you spin?

Are you spinning at any of your shift points?

[LittleMT]

Originally Posted by ITGuy11

Sure it will, I just did it two days ago

you wont run that fast at "the Strip" in Vegas, as the sweltering heat often causes the DA to approach 5000ft....

This track is somewhat brutal on heavy cars such as the Camaro, GTO's...

[69lt1bird]

Maybe you need a new tuner who can diagnose problems.

[SGOS252382]

You know it was hot both days, but what was the DA on each day? Do you still have your time slips (stock) vs (modded). If you know the date and time of each run, you can look up the DA and correct your times. Then we can see if your car is truely running slower (based on weather/altitude conditions).

[Roger Ramjet]

I wonder if the tuner eliminated torque management.

[Entaille]

Originally Posted by 69lt1bird

Maybe you need a new tuner who can diagnose problems.

Qft

[73duster]

TUNE TUNE TUNE TUNE! The mph tells the whole story. Driver input can explain 60 ft time, but the motor output will explain the mph. There is something way off in the tuning.

[Gunsmoke]

yeah, i've been racing at that track for years and you can never run the same times as everyone else in the country. must be built on an indian burial ground. lol i've only gotten to run once with my ls3 bone stock, i did a 2.3 60' time and a 14.00 @ 106. better than i expected on the mph. i totally bogged it though. hopefully i'll make it back out sunday with my full exhaust and half a tune. waiting on Lew for the wot revision.

[acatlover13]

Originally Posted by danhr

How did the car look/what did it do when it left the line before?

seemed smoother off the line--no bog

same question for after the mods?

Does not feel stronger

Does/did it bog or spin?

I was getting significant spin before the D/Rs, but not so much now. It is hard to feel "bog," but a spectator friend commented that it looked like it was bogging

Was the nose coming down then coming back up?

I don't know

If you spun, how much did you spin?

Significant spin before the D/R's but not now. (Still only have about a 1.97 60 foot time though) Before the D/Rs, I was getting about 2.05-2.10)
Are you spinning at any of your shift points?

I've only heard a chirp once or twice...not regularly

Difficult for me to say what it looked like off the line since I'm in the car and can only rely on what others tell me it looked like. It is hard for me to push the car above about a 1000 rpms at the start line, however, the higher I can get it, it seems the less bog I have. Could there be something in the torque management I need to adjust? Also, using Sport mode my car sometimes shifts at about 5500-5800 rpms, instead of holding through the power band. (My car dynoed at 360rwhp at 6200 rpms) It really seems to me to be something in the tune that is not adjusted quite right. I'm still getting familiar with my Diablo tuner, so I don't really know how to adjust torque management with it (if that's possible). I got the custom tune from Jannetty racing, but it was done remotely and they didn't have the car in their possession.

[danhr]

Originally Posted by acatlover13

Difficult for me to say what it looked like off the line since I'm in the car and can only rely on what others tell me it looked like. It is hard for me to push the car above about a 1000 rpms at the start line, however, the higher I can get it, it seems the less bog I have. Could there be something in the torque management I need to adjust? Also, using Sport mode my car sometimes shifts at about 5500-5800 rpms, instead of holding through the power band. (My car dynoed at 360rwhp at 6200 rpms) It really seems to me to be something in the tune that is not adjusted quite right. I'm still getting familiar with my Diablo tuner, so I don't really know how to adjust torque management with it (if that's possible). I got the custom tune from Jannetty racing, but it was done remotely and they didn't have the car in their possession.

If you previous best time was with wheels spin, and your current best time is on d/r, I would be happy with those timeslips. Wheel spin will make your trap speeds go up, provided you don't let out, because you are essentially making the 1/4 mile longer. So say if you had your drag radials when your car was stock, it would of ran a better ET, but had a slower trap speed. So you gained more than 2 mph in your trap speeds.

I would look into your tune/torque management. If you are shifting at 5800, you are losing ET there.... and if you have torque management still in your tune, that is definetly holding you back.

[flyby]

You said you put new nitto's on the rear, are they about the same height as stock? If not this could cause a problem.