HolyShiznit

iTrader: (11)

Are most of you running 26's or 28's? I have a 3.42 rear, 4l60e, 3600SS stall. I already purchased 275/60/15 but after playing with calculators it seems my 3rd will be quite long. 153mph @ 6300rpm according to f-body.org/gears

Thinking of dropping down to 275/50/15's which would give me 142 @ 6300 and I of course could raise my RPM if I needed more MPH.

Its a 7475 Precision on a L33 with 317 heads and a Tick Stage 2 turbo cam running on pump.

67Firebird455

iTrader: (27)

That calculator doesn't seem to account for any converter slip, so definitely account for that. Depending on converter, I'm betting the 60 series is going to be a lot more on for what you're wanting to run through the traps.

Ryans99ls1

iTrader: (16)

Depends how much power you plan on making. you could creep up on 150mph traps with that L33

HolyShiznit

iTrader: (11)

I plan on running 12-14 psi on regular pump no meth and adding more with some race gas for bigger street runs/track. Just don't want it to be too much of a dog on pump.

Photochop

iTrader: (74)

If you get a converter that works and want to leave in boost I'd go with a 28" tire, making your 3.42s more like a 3.23. It'll 60' better if the converter is working right on more tire.

JAX04

iTrader: (17)

This.

I have the Pro275 tires on my car, (not ran yet,soon) but that was one of the umpteen questions that Lane asked me when he spec'd my converter. PTC

HolyShiznit

iTrader: (11)

Well my converter was not spec'd for me. It was an off the shelf Yank SS3600 that I picked up for a clearance type deal.

RonSSNova

iTrader: (3)

A taller tire will always hook better. More sidewall and more circumference.
I'll be running 30" radial slicks with 3.73 gears.
Ron

RedRocketZ28

iTrader: (19)

I ran a 28" tire with 3.25's last year. Have a 3.00 gear this year with the same tire. With the 3.25 I would hit fuel cut at 146 mph and trapped a best of 142 last year. My converter is a bit loose but helps to build boost at the line. Plus I don't want to spin my SBE much higher than the 6400 limiter. We will see how it does this year but I see a converter tightening in my future.

Shownomercy

iTrader: (1)

28s, 3.73s and a 6400 shift, seems to work well so far.

F110Mech

iTrader: (2)

maybe i should go with a 3.25 gear. I'm hoping to go 150+ shifting at 6500. I'm forged though so i can spin it higher through the traps if need be