You're better off raising the rev limiter and pushing it a bit harder in 4th.Nice passes Bullitt, you've almost got a full second on me, haha. All I could muster this past weekend was a 13.38 @ 107 with a 2.1 60 ft. The track here was a little slick too, best traction was had launching at about 1,000 rpms, not to mention I run out of 4th gear (and had to shift to avoid hitting the limiter) about 2-3 car lengths before the traps. So lesson learned, tires need to be taller and stickier. Again, great passes Bullitt, when you get traction that's going to be quite the ride.
Wish I knew. The only things that I can figure might be doing it is that the GT500 wheels/tires are about 1/4" shorter than the OEM's (285-40 rears are 27" compared to the 27.25" 235-50's), and I'm shifting at 6,600 rpms versus right at 7,000. Maybe that's why I'm coming up short?I'm not seeing how you run out of gear with 3.73's at 107mph trap speeds, even with stock size tires.
Sorry, brain cramp on my part. The tranny gear ratios are different, your 4th is 1:1 and my 4th is 1.32:1, I bet that's the reason. I'm thinking that if I throw a set of 28" DR's on the back it should take care of it.I have 4.30's with a 28" tire, which would be like running 3.90's with a 26" tire, so probably close to 4.10 with a 27" tire, and I shift at 6000 and only go through the traps at 5600-5700rpm at 108mph.
A few guys at my track just raise the redline on the 5.0s to make the 1/4 in 4th.Sorry, brain cramp on my part. The tranny gear ratios are different, your 4th is 1:1 and my 4th is 1.32:1, I bet that's the reason. I'm thinking that if I throw a set of 28" DR's on the back it should take care of it.
I plan to bump the shift point up a little and tinker with the launch technique (before buying DR's) to try to gain some traction and the ground/distance that comes with it first.
Yeah, bumping the rev limiter would take care of it, but I'm only going to tune it if I put a S/C on it someday. I just can't see dropping the $$ on a tuner now, then spending more money on a dyno tune when/if the blower goes on. That and I'm not crazy about the idea of messing with the electronics on a brand new car, lol. If I can't stretch it out far enough with gaining traction then I'll just go with a 28" diameter drag radial, I know that will do it.A few guys at my track just raise the redline on the 5.0s to make the 1/4 in 4th.