Back spacing on 15" wheels. - Pontiac GTO Forum
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post #1 of 12 (permalink) Old 04-24-2011, 11:43 AM Thread Starter
 
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Back spacing on 15" wheels.

Alright guys, I've recently added a cam and a 10" ptc converter to my car. I'm running nittos on the stock wheels and they are not cutting it. Last trip to the track my reaction times are almost perfect on pro tree. .005, and .004. Sixty foot times of 2.4...... And I've got some serious wheel spin. I'm looking to go with a tire with a taller side wall to help hook it. Anyone running 15s and know the back spacing. All help would be greatly appreciated. Thanks!

05 PBM/RED226/232.578/.587cam,A4 3500 ptc 10" stall, dynomax bullets, 15X10/17X4 Weld RTS...giggle gas..
[email protected], 1.63 60'
New Time... 100HP shot ;) [email protected], 1.88 60' Tire spin much!?
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post #2 of 12 (permalink) Old 04-24-2011, 11:58 AM
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First off at your power levels just getting rid of those Nittos and putting on some Hoosiers or M/Ts should hook fine. If you're set on 15" wheels that are say 10" wide you'll need about 7" back spacing. If you want the maximum sidewall flex on either size rim bias plies are what you want.

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post #3 of 12 (permalink) Old 04-24-2011, 03:17 PM Thread Starter
 
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I'm interested in doing a 15" setup on the rear and leaving my 17" street stars up front. Car isn't much of a driver. Gets trailered to the track, and rarely driven to shows...know of any wheels cheaper than welds that come with a 7.5" back spacing in a 9-10 wide wheel?

05 PBM/RED226/232.578/.587cam,A4 3500 ptc 10" stall, dynomax bullets, 15X10/17X4 Weld RTS...giggle gas..
[email protected], 1.63 60'
New Time... 100HP shot ;) [email protected], 1.88 60' Tire spin much!?
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post #4 of 12 (permalink) Old 04-24-2011, 03:30 PM Thread Starter
 
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Any one tried the new Nitto NT05? Are they better than the 555R's? Or would I be better off with mickeys...

05 PBM/RED226/232.578/.587cam,A4 3500 ptc 10" stall, dynomax bullets, 15X10/17X4 Weld RTS...giggle gas..
[email protected], 1.63 60'
New Time... 100HP shot ;) [email protected], 1.88 60' Tire spin much!?
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post #5 of 12 (permalink) Old 05-01-2011, 01:26 AM
 
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https://www.gtoforum.com/f40/drag-wheel-setup-32195/

Thats a thread basically bringing the research I did on the topic. I've got a set of weld wheels on the back now with a 275/50/15 MT ET Street radial. I just BARELY got into the tire with an unrolled fender on a 15x8 5.5bs... hard launch with 4 guys in the car.

One thing to note... I burned the clutch launching the car with 4 guys in it. literally zero wheel spin through first, on the street. MT tires have some SERIOUS grip.
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post #6 of 12 (permalink) Old 05-01-2011, 10:59 AM
 
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re

I dont know at what level a Slick has until wheel spin occurs but I can tell you this. I got a set of 26X8 inch Good year slicks on a set of S-10 blazer rims and took her to the track and with a 3000 RMP launch had no wheel spin. I think I should of launch more like 4000 but I will try next time still ran a 13.30. but my 60 ft was a 2.04. Doesnt get any cheaper than that. The rims were free.

-----Danfigg
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post #7 of 12 (permalink) Old 05-04-2011, 10:51 PM
 
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Does anyone know what the bolt pattern specs are? I've researched it & gotten some info, but still have not gotten any definite. I honestly am not sure how to measure it out. I, too, want to go with a drag wheel look, some wider tires in the rear, and skinnies up front. I especially need more rubber on the back, because i burn through 1st like crazy, and when i kick second, she likes to go sideways! any info would help, thanks ya'll.
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post #8 of 12 (permalink) Old 05-05-2011, 12:53 AM
 
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5x120. If you're using drag wheels with shank lugs, 5x4.75 is the pattern you'll find without selling your first born.
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post #9 of 12 (permalink) Old 05-05-2011, 08:01 AM
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I'd change your rear wheel studs (Camaro/Corvette studs - ARP 100-7708) and especially do it if you use a 4.75 bolt pattern. The stock wheels are "hub centric" which means that they are supported and centered on the hub. Other wheels support themselves entirely on the studs and the studs are extremely soft. The ARPs are something like $25 and very easy to change.

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post #10 of 12 (permalink) Old 05-09-2011, 01:59 PM
 
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awesome, thanks for the info fellas! definitely gonna get some new studs when i drop the moola on some new wheels.
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