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Drag racing setup and tire size

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Dmax Cody
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Drag racing setup and tire size

Postby Dmax Cody on Sun Mar 21, 2010 10:24 pm

Im Gonna be building my first G-body car. An 1987 buick regal. Hoping for mid tens with a 500 hp small block with 150-200 shot of nitrous and a nine inch out back. What is the best set-up for the rear suspension of hard launches? I want to keep it stock type and on a budget but want something that will work? Is it just adjustable uppers and boxed lower control arms and a set of moroso trick springs and a set of drag shocks work? Just dont wanna spend a bunch of money on something that wont work. Also what is the biggest size tire i can stuff under the stock wheel well without modifcations. I plan on running a drag radial. Any help would be appreciated.

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khan0165
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Re: Drag racing setup and tire size

Postby khan0165 on Sun Mar 21, 2010 11:00 pm

can't say much about suspension,
but I've heard of as big as 275/60R15 or 30x9-15 tires...

what rear gear are you using?
83 GP, 350, 700r4, 8.5 10bolt, 3.42 gears, 16" IROC wheels, 13.6sec @ 103mph (on tires), 12.6sec @ 105mph (on slicks)

Dmax Cody
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Re: Drag racing setup and tire size

Postby Dmax Cody on Mon Mar 22, 2010 10:35 pm

I thinl im gonna go with 4:10's. What kinda times you running with your grand prix?

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khan0165
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Re: Drag racing setup and tire size

Postby khan0165 on Tue Mar 23, 2010 8:43 pm

well I'm discovering that my 3.42s are not so great for the strip. She really struggles to hit the power band in 3rd thru the traps. She's good for a low 13sec run at 102-104 mph.
83 GP, 350, 700r4, 8.5 10bolt, 3.42 gears, 16" IROC wheels, 13.6sec @ 103mph (on tires), 12.6sec @ 105mph (on slicks)

shotgun
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Re: Drag racing setup and tire size

Postby shotgun on Wed Mar 24, 2010 11:18 am

Put the tallest tire you can fit. A tall/thin tire has a larger footprint then a short/wide tire.

Any dyno sheet on the motor? What converter ?

Anyway, being chevys like rpm, I am guessing a 4.10 or 4.30 would do it. It is tough, NA likes more gear,N2O less gear.

For suspension do a search using my name.

I got mid to low 1.4 60 foots with the following:
Front stock coils minus one coil, poly rebuild, 3-way shocks

Rear Eibach lowering springs, single adjustible shocks, p/s air bag, adjustible upper and lower contorl arms.

Car would lift the l/f about a foot in the air and the r/r would drop about 6", all twisted up. It was a fun but scary ride.

I added my own rear sway bar and then stepped up to a HR&stuff rear bar and all of the drama went away.

Later ugraded to double adjustible shocks all around and now the car leave straight and true. I can make a run with one hand on the wheel like I am drivin' to church. :D

On a side note selling the rear and suspension out of the car. :mrgreen:
ImageImageImage
78 Olds Cutlass Drag car PONTIAC powered with 440 (destroked 455), th400, 12bolt with spool 4.10z Best to date 10.00@130.92 mph at 3250#
79 Grand Prix, will be new home for the 440 Goal "street Legal" 9.75z@135mph at 2900#
83 Malibu Wagon Crate 350, Custom T5, 8.5 with Auburn posi 3.73z Making it the Ultimate Utility VehicleGo, tow and show (not so much show, yet)

Dmax Cody
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Re: Drag racing setup and tire size

Postby Dmax Cody on Fri Mar 26, 2010 7:10 pm

Thanks shot gun. THat helps out alot.Ill Be running a 3800 or 4000 stall conveter and a trans brake. Im gonna try and stay wtih a drag radial. Like i said im hoping for mid tens. Otherwise it will be slicks. LIke i said i have no clue on what to buy and dont wanna spend a bunch of money that wont work. Thanks again

shotgun
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Re: Drag racing setup and tire size

Postby shotgun on Sat Mar 27, 2010 8:44 am

I think you might be confusing tire terms .

Radial is a construction type, you can have a radial slick (which I run) as well as a DOT radial.

You also can have biasply slick and DOT tire.

Do you need the tire to be DOT.

Will it spend alot of time on the street?

Mostly when it comes to money, higher $ usaully gets you more adjustability and consistency.

Number 1 area to spend is on shocks, especially if you run a radial tire.
ImageImageImage
78 Olds Cutlass Drag car PONTIAC powered with 440 (destroked 455), th400, 12bolt with spool 4.10z Best to date 10.00@130.92 mph at 3250#
79 Grand Prix, will be new home for the 440 Goal "street Legal" 9.75z@135mph at 2900#
83 Malibu Wagon Crate 350, Custom T5, 8.5 with Auburn posi 3.73z Making it the Ultimate Utility VehicleGo, tow and show (not so much show, yet)

Dmax Cody
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Joined: Sun Mar 21, 2010 10:12 pm

Re: Drag racing setup and tire size

Postby Dmax Cody on Sun Mar 28, 2010 12:29 pm

Yes Sorry for the confusion. I was gonna try a dot drag radial as i see some fast cars running them. But i might just go for a set of full out slicks as the car will mostly be street driven. I have a set of street tires for it and can change to slicks at the track. It will be trailered to the track anyways as its hour and half to the closest one. So a 9.5- 28 will fit in the stock wheel well? Looks like your running goodyears? And what kind and type of drag shock you running? As again thanks for the info.

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shotgun
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Re: Drag racing setup and tire size

Postby shotgun on Sun Mar 28, 2010 7:09 pm

I went thru a progression from 3-way cheapys to double adjustable QA1s.

If you are staying with a "stock type" suspension your best money is on double adjustable rear shocks.

Even if you stay with 3-way, get the good one for the rear.

The tires are 30x9 not 9.5. This is a special size used by Super Stock guys.

I have tried both Hoosiers and goodyear version with equal results.

To run these your offset needs to be perfect.
ImageImageImage
78 Olds Cutlass Drag car PONTIAC powered with 440 (destroked 455), th400, 12bolt with spool 4.10z Best to date 10.00@130.92 mph at 3250#
79 Grand Prix, will be new home for the 440 Goal "street Legal" 9.75z@135mph at 2900#
83 Malibu Wagon Crate 350, Custom T5, 8.5 with Auburn posi 3.73z Making it the Ultimate Utility VehicleGo, tow and show (not so much show, yet)


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