New worst at track

[07 Boss]

The extra shift puts it in a crappy part of 4th. If it had 4.10s or something to max out 4th that is great, but being at 4k for a few hundred feet just bogs it down in 4th. Now if it was wrapping 4th out, that is fine, the extra shift isn't a deal, but not accelerating for the last 200ft is.

With traction already an issues, 4.10s would make it worse, plus the 3.73s were bad enough for mileage and hooking on the street. The 3.31s are perfect for trapping 117-119mph at the top of 3rd.

Well you know your car better than me as far as it not pulling in fourth when it downshifts. Like I said, a lot depends on your power band, and it's all in the math as to which is ideal. And now that you are discussing other things like mileage and traction, well we weren't factoring that in earlier.

Are you planning to stay at your current power levels? I'm only asking because adding power is going to pretty much going to have the same effect on mileage and traction as putting in lower gears. I see you have a pretty powerful, well, an extremely powerful corvette, how do you keep the wheels planted with that thing?

 

[Stigma]

Why is it so difficult for people to understand this?

I went to 3.73's and all i did to Stay in 3rd gear was too adjust the 3/4 shift point via the SCT-X4 tuner....Problem Solved! Not the quickest car at the track but real close to my goal of 12.20's.....Virtually Stock-

 

[Unreal]

The point of this thread was track sucked, killed times. Not really the setup of the car. Car runs hard, but a pure shit track is hard to turn times and it shows how you can lose over a second.

I'll run it at the next event when they prep it.

Vette has 325/50/15 et streets, suspension work, etc. Hooks ok. On the street runs a 345 18 ET street. Will hook a 60 punch if I pedal it a bit to 80 or so.

Once these tires die I'll swap to a 275 pro, or 325 et street on the mustang (can put the used vette tires on it when they get to 1/2 life). If it gets more power, it will be a lot more (turbo or TVS) so the 3.31 will still be perfect as it will then top 4th out. Not doing any more power bolt ons unless it is forced induction.

Stigma, you say consistent 12.2s, well my car did 12.2s about 30 in a row until this time. So saying consistent 12.2s is rough unless you really over traction the car as I showed a bad prep day can take a 12.2 car to a 13.0 car easily.

 

[Five Oh Brian]

The extra shift puts it in a crappy part of 4th. If it had 4.10s or something to max out 4th that is great, but being at 4k for a few hundred feet just bogs it down in 4th. Now if it was wrapping 4th out, that is fine, the extra shift isn't a deal, but not accelerating for the last 200ft is.

So, what I'm hearing is that you still have the factory torque converter? A big stall converter would keep you rpm's up during an upshift, so you'd never fall below the flash speed thus staying in the power band. Perhaps a nice Circle-D stall converter is in your future; the sooner the better!

 

[Unreal]

Circle D 4c is in the garage waiting to go in, but that doesn't change where it falls on the shifts.

 

[07 Boss]

Yeah, unless you have some really high stall speeds, where it drops in the rpm's shifting should be much higher than the stall speed.

And I can totally understand running on a shitty track. I can run 11.9-12 all day and then the next outing run 12.8. 60's can vary from 1.7 to 2.1. I really hate running on midnight madness nights but it is the only times I am able to get to the track. I really wish I had a regular work schedule so I could run in a bracket or index series.

 

[Stigma]

The point of this thread was track sucked, killed times. Not really the setup of the car. Car runs hard, but a pure shit track is hard to turn times and it shows how you can lose over a second.

I'll run it at the next event when they prep it.

Vette has 325/50/15 et streets, suspension work, etc. Hooks ok. On the street runs a 345 18 ET street. Will hook a 60 punch if I pedal it a bit to 80 or so.

Once these tires die I'll swap to a 275 pro, or 325 et street on the mustang (can put the used vette tires on it when they get to 1/2 life). If it gets more power, it will be a lot more (turbo or TVS) so the 3.31 will still be perfect as it will then top 4th out. Not doing any more power bolt ons unless it is forced induction.

Stigma, you say consistent 12.2s, well my car did 12.2s about 30 in a row until this time. So saying consistent 12.2s is rough unless you really over traction the car as I showed a bad prep day can take a 12.2 car to a 13.0 car easily.

I understand what you were talking about as far as the poor track conditions....However i was talking about in general many complain about shifting into fourth and how nobody likes that....Well just change the shift point via the tuner and that problem should be gone-
At least that has been my experience....

 

[Unreal]

Depends on how close to 4th you are. With 3.73s that wouldn't work. It would have to shift at 8k for that to work or just bounce of a limiter for awhile.

 

[Stigma]

Depends on how close to 4th you are. With 3.73s that wouldn't work. It would have to shift at 8k for that to work or just bounce of a limiter for awhile.

Raising the shift point would not work with 3.73's?
I have 3.73 gears and it works for me....i adjusted both the 2/3 shift point and the 3/4 shift point w/28" rear tires....and raised the rev limiter too 7,100 and my car shifts right about 6,920 or so.....

 

[Unreal]

On a 28" tire it would, but I'm on a 26" tire. Shift points are as high as I'm comfortable with.

 

[Unreal]

So local guy wants to buy my wheels/tires which gives me the opportunity to buy new ones. Probably some 15x10 race stars with what tire? 295 et street? 325 et street? Hoosier? 275 pro? I need to drive to the track which is ~10 miles away on the highway. Won't swap wheels at the track. I have the 325 ET streets on the vette. Any reason to go with the 295s over the 325s? Any fit issues?

 

[2011/5.0]

295 should b lighter than 325,less rotating mass. I run the 295/55/15 et street and it hooks very good at 27.8 tall i may go with the 275 pro next year at 28 tall it gets great reviews both should be fine on road with no rain

 

[BMR Tech]

My old Cobra would hook on the street with 800ftlbs....on a 275/60-15 (non-Pro)

Before I went with those, I ran a 295/55.....and really liked those as well.

My vote, for your car, is a 275/60 on a 10" wide wheel.

 

[rcm90]

295 should b lighter than 325,less rotating mass. I run the 295/55/15 et street and it hooks very good at 27.8 tall i may go with the 275 pro next year at 28 tall it gets great reviews both should be fine on road with no rain

What rim and how much do your 295's weigh?

 

[2011/5.0]

im running the 15x10 weld rts its rated for street use with the mt 295/55/15 et street weighs 50lbs a stock 2011 rim and tire is 54lbs, bogarts would be nice but i street drive my big and littles alot

 

[Unreal]

295 should b lighter than 325,less rotating mass. I run the 295/55/15 et street and it hooks very good at 27.8 tall i may go with the 275 pro next year at 28 tall it gets great reviews both should be fine on road with no rain

Pros are amazing tires, but they don't like street use at all.

What about hoosiers? They seem to make a good tire too. Considering the track has very little to no prep, I want to over tire the car. I can't see that big of a difference from the 265 16 to a 275 15, but maybe there is. Was actually thinking maybe the 325 hoosiers.

 

[Unreal]

295 should b lighter than 325,less rotating mass. I run the 295/55/15 et street and it hooks very good at 27.8 tall i may go with the 275 pro next year at 28 tall it gets great reviews both should be fine on road with no rain

Pros are amazing tires, but they don't like street use at all.

What about hoosiers? They seem to make a good tire too. Considering the track has very little to no prep, I want to over tire the car. I can't see that big of a difference from the 265 16 to a 275 15, but maybe there is. Was actually thinking maybe the 325 hoosiers.

 

[2011/5.0]

So the pro's wear out fast on the street?

 

[Unreal]

I've been old a few hundred miles. They don't like being heat cycled or ran for any distance. Friend would go through a set every 300-400 miles on street. The normal ET streets he got 6-7k miles out of. As a track only tire, they work great, but for something on the street unless you plan on changing them every fill up or at best, every oil change, I would avoid them for street use.

Leaning towards maybe the 295 hoosier radial.

 

[2011/5.0]

Wow. Thats bad Guess i will stick with my et streets