What Pressure for Drag Radials?

NO SLO PK · 03-06-2003, 11:54 AM

What pressure range should I run BFG 275/40/17 drag radials at?

Consider my 5-liter has a road-race suspension and weight transfer will be non-existent.

Btw, I'm running at California Speedway this Saturday in a Cobra owners / NASA event.

Thx,
Russ

302 LX Eric · 03-06-2003, 12:00 PM

Hey Russ,

Unfortunately you've got a pretty 'thin' sidewall, so any tire wrinkle will be virtually non-existant. Of course all the BFD drag radials have a steel sidewall.

I ran mine at 16-18 psi on a stock suspension and only managed a best of 1.91 (see sig). Alot of 2.0's so I think alot of it has to do with the suspension (the main reason I am upgrading my suspension this spring).

Your best bet would be to have a nice sticky track with lots of VHT compound and a 'ride the clutch out' method of launching.

Good luck and let us know how you do.

E

Stang_Crazy · 03-06-2003, 12:13 PM

Last season I ran my DR's at 16 psi. All of my runs were 2.0xx 60' times with a best of 2.01 on stock suspension.

gtsr515 · 03-06-2003, 11:50 PM

Well, I'm assuming you mean "what to set" for a drag racing application..........If your draggin'...this is how you set optimum pressure.....start pressure OBVIOUSLY low.......make a pass, look at 60 foot, add 2 pounds pressure, make another pass...all at the same launch RPM, look at 60 foot, keep adding 1 to 2 pounds pressure until you blow the tires away on launch, then drop 'em a pound or so and that should be optimum.......If you meant for road racing.........say so, and Ill explain proper setup for that.

Jay

Ackbar00 · 03-07-2003, 10:14 AM

I have tried everything from 10psi to 35psi. And I can tell you they all suck. My best is 1.91 60 on 17in(Granted I expected this with 17inDR, its why i got slicks). I say 25 psi and baby it out of the hole.

03-06-2003, 11:54 AM	#1
NO SLO PK Registered Member Join Date: Mar 1999 Location: Arcadia, CA, USA Posts: 731	What Pressure for Drag Radials? What pressure range should I run BFG 275/40/17 drag radials at? Consider my 5-liter has a road-race suspension and weight transfer will be non-existent. Btw, I'm running at California Speedway this Saturday in a Cobra owners / NASA event. Thx, Russ __________________ Russ L '91 LX - 331 w/ Procharger '03 Cobra Convertible - Pullied '94 Lightning '65 Mustang Coupe

03-06-2003, 12:00 PM	#2
302 LX Eric or '331 LX Eric' Join Date: Jan 1999 Location: Columbus, Ohio Posts: 2,142	Hey Russ, Unfortunately you've got a pretty 'thin' sidewall, so any tire wrinkle will be virtually non-existant. Of course all the BFD drag radials have a steel sidewall. I ran mine at 16-18 psi on a stock suspension and only managed a best of 1.91 (see sig). Alot of 2.0's so I think alot of it has to do with the suspension (the main reason I am upgrading my suspension this spring). Your best bet would be to have a nice sticky track with lots of VHT compound and a 'ride the clutch out' method of launching. Good luck and let us know how you do. E __________________ 1991 5.0 LX Coupe - 40,750 miles 331 cu. in. / Tremec 3550 / BFG Drag Radials 12.22 @ 114.31 mph - w/1.89 60'

03-06-2003, 12:13 PM	#3
Stang_Crazy It's never clean enough! Join Date: Jan 1999 Location: Shaler, PA Posts: 1,542	Last season I ran my DR's at 16 psi. All of my runs were 2.0xx 60' times with a best of 2.01 on stock suspension. __________________ ~Dan 2001 SVT Lightning 89' GT : Taking up garage space and waiting for a buyer... Rice Hater's Club - Member #11

03-06-2003, 11:50 PM	#4
gtsr515 Registered Member Join Date: Nov 2001 Location: Sunny, Hot, Sebring, Florida Posts: 725	Well, I'm assuming you mean "what to set" for a drag racing application..........If your draggin'...this is how you set optimum pressure.....start pressure OBVIOUSLY low.......make a pass, look at 60 foot, add 2 pounds pressure, make another pass...all at the same launch RPM, look at 60 foot, keep adding 1 to 2 pounds pressure until you blow the tires away on launch, then drop 'em a pound or so and that should be optimum.......If you meant for road racing.........say so, and Ill explain proper setup for that. Jay __________________ Remember...2nd place is 1st place for losers!

03-07-2003, 10:14 AM	#5
Ackbar00 Rebel Fleet Commander Join Date: Oct 2001 Location: Huber Heights, OH Posts: 1,003	I have tried everything from 10psi to 35psi. And I can tell you they all suck. My best is 1.91 60 on 17in(Granted I expected this with 17inDR, its why i got slicks). I say 25 psi and baby it out of the hole. __________________ 1993 Mustang GT, PTK w/ T-64 - My Cardomain Webpage 11.25@123.5 on only 8 psi. 10.84@121 on only 1 headgasket "The Truth is, Your the Weak, and I am the Tyranny of Evil Men!"

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