Help w/ Tire Size

wido78 · Jun 28, 2005

I have a '90 Nocthback that is currently making around 470-480 RWHP / 500 Ft/Lb with a 5-Speed and 3.73 Rear End. I am curious how big of a tire I can run without bogging the car and or rubbing. I currently (at MT suggestion) have 26x8.5 ET Drags installed, but am having fairly significant traction problems off of the line as well as the 1-2 shift.

I am sure that my driving is part of the problem, but I am currently running 11 PSI and launching at 4500 RPMs. I am only cutting a 1.6 - 1.7 60' and then spinning a little in 2nd. I am hoping that someone could help me with tire selection.

Thanks

StangFireman · Jun 28, 2005

Are you wanting to run a slick or a street type tire? Can you tell us your times and MPH? Do you think you want to lower the gear or just a bigger foot print? How wide a rim do you use or want to use?
I currently run a 15X9 with 5.5BS and a BFG drag radial 275/60-15 and have had 1.61 60ft times. But I run a 4.30 and alot less hp and torque.
The 275/60 is 28" tall and a 275/50 would be 26".

tjm73 · Jun 28, 2005

wido78 said:
I have a '90 Nocthback that is currently making around 470-480 RWHP / 500 Ft/Lb with a 5-Speed and 3.73 Rear End. I am curious how big of a tire I can run without bogging the car and or rubbing. I currently (at MT suggestion) have 26x8.5 ET Drags installed, but am having fairly significant traction problems off of the line as well as the 1-2 shift.

I am sure that my driving is part of the problem, but I am currently running 11 PSI and launching at 4500 RPMs. I am only cutting a 1.6 - 1.7 60' and then spinning a little in 2nd. I am hoping that someone could help me with tire selection.

Thanks

I would suspect the tires are more than sufficent and that you should be looking at the chassis setup.

StangFireman · Jun 28, 2005

tjm73 said:
I would suspect the tires are more than sufficent and that you should be looking at the chassis setup.

Very good point.

wido78 · Jun 29, 2005

What type of items should I be looking at?

I really don't know anything in regards to tweaking the suspension/chassis setup. I haven't added anything to the rear end since I bought the car from a guy in Texas. I do know that the car has Adj Control Arms, Drag Springs, 90/10 Struts?, Welded 8-Pt Roll Bar and ???

As for the type of tire that I would like to run, I would like to stay on a slick and I am running 11.0x at 125 - 127 MPH. It is my opinion that if I can get the car to hook, I should be able to go 10.8x?

wido78 · Jul 1, 2005

Bump...

Any ideas?

87MustangGT5.0 · Jul 1, 2005

Do you still have your front sway bar up in there?

wido78 · Jul 1, 2005

87MustangGT5.0 said:
Do you still have your front sway bar up in there?

Already gone.

Help w/ Tire Size

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