MINI2

scm6079 · Jul 24th, 2002, 12:07 AM

I enjoy running in the Friday night drags -- and have been starting to take my S with the run-flats. Since there is nothing done to it, the stock tires seem fine. Normally, I drop lots of pressure for racing, but I don't think that would be a good idea for the run flats?

Anyone have any ideas/comments/experience?

EBMCS03 · Jul 24th, 2002, 03:49 AM

Wooo street racing the 'S'?

minime s · Aug 12th, 2002, 03:36 PM

what times have you run ? MPH ? 60' ?

Albert · Aug 12th, 2002, 07:10 PM

Just a quick note about dropping PSI at the track. Dropping PSI to increase tire contact patch on radial tires is a myth. It works for bias-ply tires, but not really on radials. What happens when you lower psi on radial tires is that it creates a "cupping" effect, where the middle part of the tire becomes slightly concave, creating a less effective contact patch in the middle.

Albert · Aug 12th, 2002, 07:11 PM

Oh, btw, what 1/4 mile and 60' times are you running? How are you launching your car (what rpm, clutch dump?, etc.)?

scm6079 · Aug 13th, 2002, 03:04 PM

Here's my slip, I'm in the left lane. This is in Phoenix, AZ -- above sea level, at ~100f weather. You can follow more at the thread:

http://www.mini2.com/forum/showthrea...4&goto=newpost

Andy @ The Pit Stop · May 15th, 2005, 10:54 PM

do not drop the pressures as no gain will be made, only putting undu stress on the side walls on very expensive tyres. How about a thought to all that mass you are trying to accelerate and unsprung weight !. How many seconds can you drop by putting much lighter std tyres on. weight takes horse power to move it ! forwards and round.
Andy.H.
PS if you must mess with pressures, increase the rears to help reduce rolling resistance.

badboyzbadboyz · May 16th, 2005, 04:58 PM

Quote: Originally Posted by Andy @ The Pit Stop

do not drop the pressures as no gain will be made, only putting undu stress on the side walls on very expensive tyres. How about a thought to all that mass you are trying to accelerate and unsprung weight !. How many seconds can you drop by putting much lighter std tyres on. weight takes horse power to move it ! forwards and round.
Andy.H.
PS if you must mess with pressures, increase the rears to help reduce rolling resistance.

That advise might be about 2 and a half years too late

RedUn · May 16th, 2005, 05:53 PM

Quote: Originally Posted by UCSDxB0i

Wooo street racing the 'S'?

2 years too late but i didn't know drag and street where the same

Jul 24th, 2002, 12:07 AM	#1
scm6079 MINI2 Regular Join Date: Jul 2002 Location: Phoenix, AZ Local Time: 11:51 AM Posts: 52 Offline	Drag Racing on the Pirelli Run Flats? I enjoy running in the Friday night drags -- and have been starting to take my S with the run-flats. Since there is nothing done to it, the stock tires seem fine. Normally, I drop lots of pressure for racing, but I don't think that would be a good idea for the run flats? Anyone have any ideas/comments/experience?

Aug 12th, 2002, 03:36 PM	#3 (permalink)
minime s M7SPEED SPONSORED MINI ! Join Date: Jul 2002 Location: Dix Hills,New York Local Time: 02:51 PM Posts: 644 Offline	what times have you run ? MPH ? 60' ? 1/4 mile 13.07 @109mph...258 wheel horsepower, 03 cooper"S" Pure Silver,18" Kahn's,Aero Kit,Nitrous Express NOS kit(50 shot),Evotech Computer upgrade,ALTA intake,short shifter,Magnaflow exhaust,header,pulley upgrade,cam,H&R springs,quaife,MSD Coil a

Aug 13th, 2002, 03:04 PM	#6 (permalink)
scm6079 MINI2 Regular Join Date: Jul 2002 Location: Phoenix, AZ Local Time: 11:51 AM Posts: 52 Offline	1/4 Mile Times Here's my slip, I'm in the left lane. This is in Phoenix, AZ -- above sea level, at ~100f weather. You can follow more at the thread: http://www.mini2.com/forum/showthrea...4&goto=newpost

May 15th, 2005, 10:54 PM	#7 (permalink)
Andy @ The Pit Stop MINI2 Newbie Join Date: May 2005 Local Time: 06:51 PM Posts: 15 Offline	drag racing runflats do not drop the pressures as no gain will be made, only putting undu stress on the side walls on very expensive tyres. How about a thought to all that mass you are trying to accelerate and unsprung weight !. How many seconds can you drop by putting much lighter std tyres on. weight takes horse power to move it ! forwards and round. Andy.H. PS if you must mess with pressures, increase the rears to help reduce rolling resistance.

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Jul 24th, 2002, 03:49 AM	#2 (permalink)
EBMCS03 M5 Extraordinare! Join Date: Mar 2002 Location: So Cal Local Time: 11:51 AM Posts: 6,777 Offline	Wooo street racing the 'S'?

Aug 12th, 2002, 07:10 PM	#4 (permalink)
Albert MINI2 Regular Join Date: Jun 2002 Location: Costa Mesa, CA Local Time: 11:51 AM Posts: 303 Offline	Just a quick note about dropping PSI at the track. Dropping PSI to increase tire contact patch on radial tires is a myth. It works for bias-ply tires, but not really on radials. What happens when you lower psi on radial tires is that it creates a "cupping" effect, where the middle part of the tire becomes slightly concave, creating a less effective contact patch in the middle.

Aug 12th, 2002, 07:11 PM	#5 (permalink)
Albert MINI2 Regular Join Date: Jun 2002 Location: Costa Mesa, CA Local Time: 11:51 AM Posts: 303 Offline	Oh, btw, what 1/4 mile and 60' times are you running? How are you launching your car (what rpm, clutch dump?, etc.)?

May 16th, 2005, 04:58 PM	#8 (permalink)
badboyzbadboyz MINI2 Jedi Master Join Date: May 2003 Local Time: 06:51 PM Posts: 1,257 Offline	Quote: Originally Posted by Andy @ The Pit Stop do not drop the pressures as no gain will be made, only putting undu stress on the side walls on very expensive tyres. How about a thought to all that mass you are trying to accelerate and unsprung weight !. How many seconds can you drop by putting much lighter std tyres on. weight takes horse power to move it ! forwards and round. Andy.H. PS if you must mess with pressures, increase the rears to help reduce rolling resistance. That advise might be about 2 and a half years too late

May 16th, 2005, 05:53 PM	#9 (permalink)
RedUn MUGEN POWER Join Date: Mar 2003 Location: s2ki.com Local Time: 07:51 PM Posts: 11,615 Offline	Quote: Originally Posted by UCSDxB0i Wooo street racing the 'S'? 2 years too late but i didn't know drag and street where the same

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