What rpm should I launch my car at?

[sr530]

Originally Posted by acammer

They are all present at about 4200. It's not just a rev control, but it modulate the throttle blade with the clutch release, and what it sees for available traction. All of that is designed to work around a known tire compound, gear ratio, and power train - and all of that on pavement. As soon as you start to change anything about the car, and/or take it to a sticky drag strip, the viability of that factory launch control is out the window. A good driver even with everything being stock will stand to get more out of the car with it defeated. It guess it's fun to mess with when the car is stock, but once you start in on the mods, it just doesn't have the capability to produce really good results.

A second gear start would really slow the car down. Generally speaking, unless they've got a PD blower installed that makes tremendous amounts of low end torque, these cars actually need quote a bit MORE starting line ratio. For context - my car hooks well (on good, drag-specific tires) with a 4.63 rear gear and the standard SS "M10" ratio set with a 3.01 first gear. So that's like a 13.9:1 starting line ratio. The 1-2 shift definitely comes up quick!

I'm wondering how much potential you are leaving on the table with the RXT and no clutch hit controller

Grant

[acammer]

Originally Posted by sr530

I'm wondering how much potential you are leaving on the table with the RXT and no clutch hit controller

Grant

Tons!!!!

The Hoosier QTP is the hit controller in the current configuration. The car has never 60' faster or more consistent than it is with that tire. No doubt because the bias ply offers it that bit of slip that's soo much harder to get from the clutch. The Hoosiers were on the wheels when I bought 'em, so I gave 'em a try, and they really impressed me with how easy it was to consistently run within a few numbers in the 60' while making the best times yet. Too easy after spending years slipping the clutch on radials.

It hasn't been to the track with the Max Package 2.0 setup and 4.63 gear on a radial. It is something that's probably going to happen in the future, as I'm planning to put the drag pack on a radial soon as the Hoosiers are spent. It'll be a 305/45R17, probably an ET-R or ET S/S. I agree, the RXT is a fast, aggressive engagement, it's gonna be tricky to keep the tire hooked and not bog it. The 13.9:1 starting line ratio will help, but I agree that some clutch release help would be a key to make it fast and consistent.

The clutch is obviously all wrong for what I do right now. I was trying to live in the buy once, cry once world, and have something that'll take 750+whp reliably once it has boost on board. Everything happens slower than we'd like, so here it is 6 years into that clutch, and it still is NA and way more than the current powerplant needs. :(