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I did three 0-60 runs today--once just flooring it and 2 times using launch control with stability control OFF. As expected, launch control is the way to go to achieve max performance. I've used launch control on my other cars but it was the first time on my GTS. OAT was 69F, tires were stock P Zeros, and the tire pressure was 35 PSI in the rears; I normal run 29 PSI in the front and 30 PSI in the rears but must've warmed up during my "spirited" drive. It was on regular side streets which I found to be smooth; the streets in OC are fairly good, I'd say. The data is from the COBB Accessport.
1st run: Sport Mode, WOT from stop, 3.38 seconds. The rears lost traction, which felt like eternity.
2nd run: Sport Mode, Launch Control, 3.23 seconds. The rears lost traction and not as bad as the first run. Same street/spot as the first run.
3rd run: Sport Plus Mode, Launch Control, 3.116 seconds (see attached). The rears lost traction again but not as bad as the first two times. This was on a different street with what appeared to be better asphalt.
I think if I had better tires (ie. Michelins), lower tire pressure, and better pavement, the times will definitely improve to possibly even under 3 seconds. The rears not hooking up from launch is the biggest culprit. Still, I think these are impressive numbers from just a simple tune and a few mods.
I did three 0-60 runs today--once just flooring it and 2 times using launch control with stability control OFF. As expected, launch control is the way to go to achieve max performance. I've used launch control on my other cars but it was the first time on my GTS. OAT was 69F, tires were stock P Zeros, and the tire pressure was 35 PSI in the rears; I normal run 29 PSI in the front and 30 PSI in the rears but must've warmed up during my "spirited" drive. It was on regular side streets which I found to be smooth; the streets in OC are fairly good, I'd say. The data is from the COBB Accessport.
1st run: Sport Mode, WOT from stop, 3.38 seconds. The rears lost traction, which felt like eternity.
2nd run: Sport Mode, Launch Control, 3.23 seconds. The rears lost traction and not as bad as the first run. Same street/spot as the first run.
3rd run: Sport Plus Mode, Launch Control, 3.116 seconds (see attached). The rears lost traction again but not as bad as the first two times. This was on a different street with what appeared to be better asphalt.
I think if I had better tires (ie. Michelins), lower tire pressure, and better pavement, the times will definitely improve to possibly even under 3 seconds. The rears not hooking up from launch is the biggest culprit. Still, I think these are impressive numbers from just a simple tune and a few mods.
I really never saw 0-60 times improve with the tune. A rwd GTS with cats and headers is already becoming traction limited. Flash back to stock and do some launches, see if your results are the same. But 60-130 and 1/4 mile improvements are impressive
I really never saw 0-60 times improve with the tune. A rwd GTS with cats and headers is already becoming traction limited. Flash back to stock and do some launches, see if your results are the same. But 60-130 and 1/4 mile improvements are impressive
I do remember the first WOT from a stop after installing cats, headers, and BMC air filter...definitely lost traction. I'd have to go on a track for the 60-130 and 1/4 mile pulls but I definitely feel it pulling harder than before the tune on my spirited drives. Do have 1/4 mile times?
I do remember the first WOT from a stop after installing cats, headers, and BMC air filter...definitely lost traction. I'd have to go on a track for the 60-130 and 1/4 mile pulls but I definitely feel it pulling harder than before the tune on my spirited drives. Do have 1/4 mile times?
My best 1/4 is 11.24@130.3
Flashed back to stock was 11.55@123.8
!/4 times for me are almost identical thru 330' - 5.01 to 5.04
I have a 91 pro-tune, akra cats/exhaust,headers,intercoolers, and BMC.
I do remember the first WOT from a stop after installing cats, headers, and BMC air filter...definitely lost traction. I'd have to go on a track for the 60-130 and 1/4 mile pulls but I definitely feel it pulling harder than before the tune on my spirited drives. Do have 1/4 mile times?
I had an almost identical experience on my GTS. As delivered spun the wheels from a stopped start. Reduced the crazy delivery tire pressure to 32psi cold and traction was good. Then installed Vektor headers and soul cats and the Pzeros struggled with traction even at the low pressures, could loose traction even into 2nd. It definitely made a noticeable torque difference! Installed BMC filter afterwards and it definitely made an audible difference but likely minimal performance. Then I switched to MPSC2’s and traction was definitely improved to similar to pre headers and cats.
With a pro tune on a GTS I’m pretty sure it will be traction limited even with the MPSC2’s.
Interested to hear from anyone who has a similar setup to mine with a tune or pro tune.
How is the car on the twisties? With headers, cats and BMC mine definitely has become more of a handful even with the MPSC2’s.
I have noticed more occasions of the rear stepping out and to a larger degree. Curious to know if a tuned car loses some of its drivability on the twisties. Driving on the twisties is what reminds me why I bought the car.
Interested to hear from anyone who has a similar setup to mine with a tune or pro tune.
How is the car on the twisties? With headers, cats and BMC mine definitely has become more of a handful even with the MPSC2’s.
I have noticed more occasions of the rear stepping out and to a larger degree. Curious to know if a tuned car loses some of its drivability on the twisties. Driving on the twisties is what reminds me why I bought the car.
fsmich also has Vektor headers, akrapovic cats and exhaust, I think ams intercoolers, and bmc filter with a protune. He takes his on road courses.
I imagine with a protune, the throttle response can be modified. I.e. torque demand vs throttle position. So, if you find it too fast. It can be dialed slower. Otherwise, just more practice with throttle modulation.
A customized throttle map is common in motorsports. A friend was an engine calibrator for Honda indycars and he was assigned to specific drivers. Every driver got the engine calibrated to their preferences for every track. In MotoGP, the throttle mapping can even be changed depending on track location, I.e for specific corners, the mapping could be different.
I'd rather have more power than I can handle. As spdracerut said, just learn to modulate the throttle better. Practicing is the fun part. C4 GTS would fare better in the traction department but more fun to be had in a C2 for me.
Did you start with the Stage 2 Map? Or are your final #s close to the Stage 2 #s?
Sorry for taking so long to answer this question but the response from TPC to this question was, the map is a custom map that Mike Lavitas created on our 991.2 shop car. This TPC custom map is optimized for 93 octane. The ECU will self adjust to different octane changes."
01-18-2020, 08:06 PM
