Do you have any baseline 1/4 mile times to compare to when you run these MT's?

 

Well my best 1/4 mile time is 14.51 but without the tunning and cai. When I take to the track I'm going to do a comparision street tires vs slicks to see how much of a difference it makes.

 

If you read my post i'm talking about the difference between 05s trans and the 06 and up trans. Some people say the trans or ecm/tcm is different and i have not seen info to prove this.

I know there is a lot of transmission failures, which is why in my other post just below i say we don't have the best transmissions.

 

You're also comparing the GXP's. The OP has an SS, although are cars are the "same" they are still different.

 

I turned my car in Friday for transmission repairs. They are going to tear it apart on Monday. I have the option of getting 3.69 gears from the Chevy Uplander. Should I or should I not. I have a tuner who will fix any issues associated with the gear ratio change. It would definitely rpm quicker and I could use third gear in the quarter. I need opinions before Monday evening.

 

i wouldnt go with the 3.69s its hard enough to hook as is.they dont have 3.29s available?

 

where can you show me the proof that there is any diference in drivetrain and ecm/tem? I just want proof because on the build sheets they are the same drivetrains (other than tap-****) and same computers throught out the years and differnt ls4 cars.

suspension, brakes, body and interior are different but the rest is the same.

 

They do. This is probably a once in a lifetime situation for me though. I will most likely do it.

 

What psi should I put on the slicks?

 

I'd start at 25psi or so. Then go down in pressure as needed for traction.

 

Go over to ClupGP and GPONA forums in the GXP sections and this is what you will find. There could be all kinds of reasons why alot have a problem and dont beat on there cars but you will find a few that do and dont have a problem (but those arent the norm).

 

tap Shift requires different software/tune in the tem. has to be to allow manual shifting.

 

Thanks CenTexSS I noitced you have some BFs how well do those hook? I have the same ones but have problems hooking even dropping the air pressure.

 

Well I put on the slicks this afternoon to get a feel when I go to the track this wednesday if it dont rain then went on one of the back roads to try them out. First I just gave little spin, stalled at 2500rpm ,and slightly hammered it. Man it felt good to not spin!! I did it again , stall at 2500, and slightly hammered a little more than the first time, felt even better no wheel spin. Yes I know at the track its different but just wanted to get a feel!!! The only thing I didnt like was that once i reach 60mph the car starts shaking a little. They did balance the tires, don't know if they did it right or if its normal for it to do that. tires were @ 25psi.

 

Slicks get out of balance quickly because of the tire deformation they have due to the soft sidewalls. It's pretty much a waste to balance a slick.

 

What wheels are you using?

 

They are from a 99 grand prix.

 

So its better not to balance them at all?

 

My BFG street tires don't hook up so well. They're decent for an allseason tire, but not for all out performance. But on a well prepped track, they still have netted me 2.11 60 foots.

I now have 255/50/16 BFG Drag Radials. I've gotten 2.06 60 foots at a lesser prepped track with 25psi and a small burnout. At my local track, I've only gotten a best of 2.27 on the street tires, and a 2.16 on the DR's due to lack of prep.

 

A good balance can't hurt. With my old Civic, I trapped 105-106mph on MT slicks and didn't have any issues with steering wheel shimmy.