Launching @ 4Krpm problem .... need tips

[Parmas]

Thanks Loren for the deep info on topic...

So what Brand and type of shock do you recommend for my Vitz 2001 NCP10?

Originally Posted by Loren

There is much you can do to try to address the problem, but probably the biggest thing is to just launch smoother. Slip the clutch a little, maybe launch at 3500 instead of 4000? .

I am building a car to drag race... this must launch above 5K for a good start. Of course I have to be able at 4K before

Toyota Starlet... you can't compare. It's RWD. When you launch a RWD car, the weight transfer to the rear HELPS the car to hook up.

I was comparing to the 1990+ Starlets which any of them aren't RWD.

[Loren]

Originally Posted by Parmas

I was comparing to the 1990+ Starlets which any of them aren't RWD.

Ah, okay. The Starlet was only sold in the US in the early 80's... as RWD.

Any adjustable performance shock is going to be better than your stock shocks. None of them are designed for drag racing, though. They're generally going to be valved for road course use or for "agressive street" driving. But, you can use their adjustability to your advantage. As I said, probably something like full-stiff in the rear and a little (maybe even a lot) softer in the front.

The ideal setup would be custom valved shocks/struts with matched springs all set up by a suspension engineer who knows FWD and has drag racing setup experience. But that's gonna cost big bucks. Probably well over $2000.

[Blown_xa]

suspension upgrades like springs, coil-overs and shocks won't solve the problem.

Motor mounts help. Best thing to do is to upgrade the A-arm bushings to urethane or spherical bearings. Wheelhop is causeed by rotational movement of the A-arms.
The other thing you can do is to make traction bars, this will eliminate wheelhop all together.

this is what a traction bar set-up looks like for a fwd car, it links the front control arms to the lower core support.....

http://www.full-race.com/catalog/pop...7756e08be3c159


you may even be able to make a Honda set-up work with some fabrication