I,ve yet to see a C6 mn break into the 12's at my local track, last night the best pass I saw was 13.43 @ 110+. We (the 'vette fellas) were talking about this last night. The LS6's consistently ran at least high 12's, with some in the 12.2 - 12.5's. Seen about 20 or so mn C6's at this track, low 13's at best. My question is why?, on paper they are not that far apart, at this track it's no contest.

 

It is mainly because of torque managament and CPU tuning. On the dyno they will make very similar numbers with the low end torque advantage going to the C6.

 

my Z51 ran 13.0 completely stock. I had MTI change the amount of timing the PCM was pulling due to coolant temps, adjusted the fans to come on earlier (temp stays at 180F now instead of 218F) and changed the thermostat. It went 12.4 on the next visit to the track.

Its the computer that holds back these C6s, not the engine. In order to run low/mid 12s in a C6, the engine has to be completely cold, not at operating temp.

 

Thank you. Now, why couldn't the software writers at GM offer "HOT" computers through their motorsports division that would "free up" these imposed restrictions? After all, they could be writing the restrictive software "street" version as they take into consideration the "performance version" (for off-road use only). This would make it simpler. First, it would be profitable to have the original key and possibly the safest path to unlock the hindered power in a stock 'vette. Second, it would eliminate the frustrations of purchasing a sports car for occasional track use, only to find obstacles on the way to fully enjoy it. As far as liability, warranty, maybe GM's exposure is greater in the hands of inexperienced tuners (there are only a few good software tuners per state) than having their own stuff. Buy the 'vette, then off to the parts dept to pick-up or order the computer. Install it or download it. Just like a high-performance cam. I share this because I've seen the disappointment on the faces of C6 owners at the track. So if I understand the previous answers correctly, the C6 LS2 has more restrictive computer control over it's power than the LS6. Why are we going backwards?

 

And why wasnt the queen born with ********* so she could be king?

 

That is what aftermarket tuners are for. Some guys have two and three computers, <50dF, 50-85dF and >85dF.

And some ppl put in the Bosh progamable PCM, with a switch on the dash for which program you want to run. Not a cheap system.

Compters run the cars get use to guys.


********* on a Queen, - I dont care to go there .....

 

That's right! Toyota's not going backwards check out their TRD product line they'll even install blowers!! warranty loss none, Porsche owners who road race their cars no warranty problems they install chips etc too. BMW same deal headers chips intake they install no warranty problems. Love my vette. One trip to the track and I never returned. It's absurd this TM thing. My dealer won't warranty if I go into the computer.

 

IMO, once you get torque managment out of the way, they're very close.

Keep in mind the following;

the C6 has run flats vs the Goodyear F1 - with more torque at the bottom and slippier tires - you have a harder time launching. You didn't mention 60 ft times, but I would bet the C6es are around the 2.1 range vs the 1.9's for the C5Z's.

The C5Z's have been around for a while and the drivers have plenty of seat time in them.

Break in- notice how awesome the LSX engines feel after a lot of miles.

Around a road coarse its up to the driver C5Z vs C6Z51.

Finally- since the C6 has more cubes - a head and cam package with full exhaust makes a bunch more power then the 346, so with the basic bolt ons the C6 can be a monster.

My 03 Z makes 457/421 to the wheels - a C6 with similar mods would make 500 / 480 - add stickier tires and no TM and watch out!