607motorsports

iTrader: (6)

I tried posting this in the tire forum without any luck

I'm having a lot of trouble getting my car to hook up on the street. I just dynoed the car and it made 703whp/640wtq on a turbo setup. I'm running 275/40/17 Mickey Thompson DR's on the car and it's blowing them off in the upper rpms of third gear. I've never played with the tire pressure on them so looking for some advice on what is safe to run the tire at on the street. Right now they are at 32psi.

Any advice? What are you guys doing to get your high HP cars to hook on the street? Thanks guys!

+badss+

iTrader: (12)

I'd drop psi down to 25 and try that first.

+badss+

iTrader: (12)

The 275's are hurting you but I'd go no lower then 20 psi

Camaro9969

iTrader: (12)

What's your suspension set up? Its the 17s that are killing you. My 305/35/18 mt drags are useless on the street even at 80mph but the MT Pros 275/60/15 hook on the street almost as well as they do at the track its crazy

Nitroused383

iTrader: (10)

Those tires should easily hook on your car and especially in 3rd gear. Lower your tire pressure, remove sway bar and buy decent adjustable shocks. If the streets get too cold it really doesn't matter what you do. I can hook 275/40-17 Toyo proxes tq in 1st gear on my car. Oh I forgot to mention lower control arm brackets and an adjustable torque arm help alot.

607motorsports

iTrader: (6)

Thanks guys i'll give the tire pressure drop a try and see if it helps, I was just curious to see what others running similar power were doing. It was in the low 80's and the tires were still blowing off the car at around 80-90mph in 3rd gear.

I have full suspension on the rear of the car, LCA's, relocation brackets, panhard, torque arm. No shocks yet though just the stock Billsteins on there now.

Camaro9969

iTrader: (12)

Tire pressure will help but shocks up front will be the best upgrade I got DA front shocks and springs made my car completely different

WhistlingZ

What's your pinion angle set to?

I have more rwhp and run 26" et street tires and they dead hook..

607motorsports

iTrader: (6)

Are we still talking hooking on the street? The closest 1/4 track is a couple hours from me so this car is pretty much an exclusive street car.

WhistlingZ

Yes. Street, dead hooking. What's your pinion angle? What torque arm?

Detoxx03

iTrader: (14)

I run mine around 25psi. Doesn't always hook but that's why I know how to use the left pedal. Have adjustable pfadt shocks so that helps some when i'm not tearing up the twisties. This is on 345/30/19's

Cam72aro

iTrader: (28)

17" tires have a small sidewall and shock the tires too hard. I run a 325/50/15 bfg drag radial and have good luck hooking on the street. If I hit it hard from a stop it will spin, but ease into it and then pour the power on it will dead hook.

607motorsports

iTrader: (6)

I'm honestly not sure of the pinion angle. The torque arm and all of the rear suspension components are Founders Performance. I can try playing with the pinion angle for sure.

Our weather around here is getting a bit chilly so i'm sure that's going to hurt traction a lot

Slow94Formula

iTrader: (18)

I run my 17" ET Streets at 18-19psi when warm. Pinion angle is set at close to -2.5° and it hooks awesome now.

CameronVic

iTrader: (5)

Do you have any clue what your instant center is? I hook perfectly fine anything from 20mph+ in my 3900lb crown vic on a 26" 275 mickey thompson radial. Then again I roll around on 18psi everywhere I go because I'm too lazy to put air back in it when I leave the track. It gets up to about 20psi driving around. If it doesn't hook after getting your instant center figured out, just add weight, it seems to be working for me. LOL.

Oh, and instant center is lightyears more important than pinion angle.

607motorsports

iTrader: (6)

I haven't done much in terms of setting up the suspension to be honest. Guess I should do some research and set it up properly.

Slow94Formula

iTrader: (18)

Letting air out of the tires is simple enough. You might as well see if that works first. lol

CameronVic

iTrader: (5)

Yea give that a try first. A bigger tire, or more sidewall, etc is all a band-aide. I have a friend that knows a ton about suspension, I told him my measurements, and he told me what to do. So I got some old worn out springs to lower the rear of the car 1.5-2", and that put my instant center right at the back of the trans and 20"off the ground.

All I have are billet aluminum control arms in the rear and some comp engineering 3 ways front and back. 30-70 back and 90-10 up front. She gets down alright for a heavy turbo footbrake car. Anyone that has ever raced at clarksville knows how (un) friendly it can be to radial cars unless you have your stuff dialed in.

skinnies

iTrader: (33)

First find someone to setup your suspension if you don't know how.

Second, and the one that most seem to forget is power management. We put down over 1000rwhp on the street on a pure street tire(not drag radials) and make the car work.

Slowhawk

iTrader: (12)

Suspension is the issue.Get the front to raise and load the rear.