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Drag Suspension Setup

MJTru
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MJTru Mentor

MJTru

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Hi mate.

I have spent a lot time building power, but now I know a lowered r33 gtst has no grip off the line.

I had a mustang before and I had set that up for good launching the advantage I noticed is that the mustang had a solid axle and the geometry of the suspension was way better for drag racing. I think this is because the mustang always through out the whole weight transfer kept the tires flat.

But with the skyline being lowered I'm already at a disadvantage cause my camber in the rear is off and I'm riding on the inside off the tire to begin with. Now when the car is leaving the line it flexes to transfer the weight and the rear wheels go even more off camber. More on the inside edge of the tire. Hence the car can't dig in.

Does anyone have any experience with a good drag setup. Like the shocks I need and what Kg springs to use. Along with the hight from fender to middle of the axle. I'm also thinking of pineapples (don't know if they work) along with some arms to adjust the rear camber and toe of the rear wheels.

Any imputs would be helpful.

Thanks mate

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MJTru Mentor

MJTru

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I was hoping for a more detailed explanation. Trust me i started out with that. It's not going to be that good. I feel that the hight needs to be raised about 365mm from fender edge to axle and some soft springs. And start off with about +1 camber.

gtr jet Veteran

gtr jet

Posted
Posted

Well your on the right track. The principles apply from the Mustang to the Skyline.

The one major difference being IRS. A raised ride height and some positive camber will help traction off the line.

Also, what tyres are you running and how much power?

MJTru Mentor

MJTru

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The pineapples are for the skyline R33 gtst. The power is about 420hp. It's not that much but right now it's just spinning up the tires. Even with the stock rear shocks and springs. I have also changed my driving style and nothing is helping to much.

I'm looking at the titan supra for clues. I notice that it has to be real soft. With good shock dampening. To work. But do I need to also raise the front of the car as well or just the rear.

I'm just using my old set up on my mustang as a comparison. Where the skyline leaves the line spinning the wheels I had way more power in my mustang with way more toque in the past but it just took of way faster. But the skyline is way stronger mid track. I feel if I can get the right setup I would love this car. I have the car set up with down graded s13 rear brakes and have a set of weld racing rims and 10x26x15 micky Thompson et drags to run.

I just need help finding the ride hight and shock and spring rate to start out with. I'll post a video of a friend driving my old mustang (I sold it) against the skyline. At only 7 psi. A bit later. Thanks mates.

MJTru Mentor

MJTru

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My i add that the mustang is running full stocker 346 with full drag suspension. And NT555 tires. I feel if i run my gtst at 18 psi i can run it down. But that's not my interest. I just want to launch the same way.

gtr jet Veteran

gtr jet

Posted
Posted

Adding 90/10 shocks with standard springs will help but I think the main thing will be the ET streets.

If the car is manual then leaving the line with boost will also be difficult. It's either dump the clutch at 6000rpm+ or bog down.

Maybe try to set up some kind of 2 step limiter for launch?

GTRPSI Mentor

GTRPSI

Posted
Posted

Its all been covered here.

Most people find the stock suspesion setup is best including the factory soft spring rates.

Watch and try to measure/workout the rear squat on launch, a little positive camber on the rear when unloaded will turn to no camber on launch for the best rear footprint so you need to set it up with no camber when at the launch/loaded ride height.

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