Who has the fastest car with the GM Tune?

[Lithium Lotus]

If you have the GM Tune and the stock turbo, please list your fastest 1/4 times. I just want to see what everyone is running. Also, please list if your car is auto or manual, and any performance mods other then the tune.

Car: 07 Solstice GXP auto
Mods: GMPP Tune, GMPP Intake, Solo high-flow cat, Solo MachShorty exhaust.
Time: 13.7@100.4

[MeanGXP-R]

13.9 without a tune

[stealthsky]

Originally Posted by MeanGXP-R 13.9 without a tune

Thats not what he asked...

13.6
manual
The rest in in my sig. Happened before the lighter/stickier wheel tire combo.

[I1ULUZ]

You also need to look at the 60ft times to see if they spun and gave an artificially higher MPH.

Stealth your wheel/tire combo is only .5 pounds lighter than stock. Plus wider tire put more weight further from the center so I would call it a wash.

[bones]

2007 gxp w/auto and tune
gmpp cai
0 to 60-4.7
13.7-98mph
This was on a dashawk,so take it for what its worth.

[Craig Lewis]

Every automotive forum I have seen gets tons of responses to a thread like this.

Manual 07

I ran 14 flat with just the exhaust.

14 flat with the addition of the GMPP tune.

My 60's were well above 2.0, So I don't want to talk about it. It got worse after the tune.

I once saw 106mph. Mostly 101 or so.

I could be exagerating, but my car feels a full second faster than my times represent.

[Lithium Lotus]

My 60ft isn't great either with the stock Goodyear tires. I haven't gone lower then a 2.2 with them.

[R&T]

Are you guys saying the MPH is factored by your 60' times? If so, how is this done? Why wouldn't they just have a radar at the finish line?

[Alan_L]

Originally Posted by R&T Are you guys saying the MPH is factored by your 60' times? If so, how is this done? Why wouldn't they just have a radar at the finish line?

60 foot's make or break a drag race, I was throwing down 3 second 60's all day and that was causing my quarter to be low in proportion to my trap's, I think my best was 14.00 at 107. If I could get my 60's into the mid to low 2 seconds then I would be running 13.5's-13.3's.

[R&T]

Oh, I understand. I had to think about this for a minute. Regardless of you 1/4 time if your 60' improves your 1/4 drops. Got it.

It didn't make since at first because I just read an article where a guy ran 2.4 60' but hit the 1/4 at 11.7. If he can hook up the traction he would be in the low 11's.

[Craig Lewis]

I just want to mention that I got 13.6 at 102 today. I am happy that I have finally got well into the 13's, and consistently for the day

GM tune.

[WWI Flying Ace]

I'm curious about this too. Since the GMPP tune has the "no learn-down" feature, I'd expect some really fast times over stock here.

For that matter...what is an average stock GXP quartermile time without the GMPP tune?

[I1ULUZ]

Originally Posted by R&T Are you guys saying the MPH is factored by your 60' times? If so, how is this done? Why wouldn't they just have a radar at the finish line?

The more you spin off the line higher your MPH will be.

Lower the 60' time lower your ET and your MPH will be.

Think of it like this the more you spin longer the distance your tires travel (more revolutions), longer the track, higher the MPH.

Figure a 1.9 is pretty good 60' time in our cars, they don't have the torque to really let them get a great holeshot. More likely with good track prep, the people in front of you not dragging water to the line and your ability to launch the car I would expect to see a lot of 2.0 60' times.

Drag racing is a race of acceleration not speed. Watch NHRA Pro Stock class if you want to see a race where it comes down to even matched cars and the race is decided by the Reaction Time of the driver.

And NO your RT does not affect your ET. The clock starts once the front tire rolls out of the starting beam.

[NormSky]

A good rule of thumb is to double the reduction in 60' times to see changes at the end.

If you dropped 60' from 2.2 to 2.0 you can expect .4 drop in your ET. Might not be exact with turbos but for NA it is very accurate.


Norm

Originally Posted by Lithium Lotus My 60ft isn't great either with the stock Goodyear tires. I haven't gone lower then a 2.2 with them.

[Craig Lewis]

Originally Posted by NormSky A good rule of thumb is to double the reduction in 60' times to see changes at the end. If you dropped 60' from 2.2 to 2.0 you can expect .4 drop in your ET. Might not be exact with turbos but for NA it is very accurate. Norm

Your arithmetic gives me hope for FAR better times. I never spent much time learning the math of drag racing. It always impresses me what some can deduced from a timeslip.

I witnessed an auto GXP do 2.0 flat repeatedly on stock tires, just yesterday.