Actually, the stated max pressure on my Bridgestone RE-750s is 51 psi max.
I think that is fairly unusual for passenger car tires, though...
Kerby
-----Original Message-----
From: shotimes-admin@autox.team.net [mailto:shotimes-admin@autox.team.net]
On Behalf Of D. Mallinson
Sent: Monday, September 04, 2006 5:18 PM
To: shotimes@autox.team.net
Subject: Re: [Shotimes] N/A Dyno 318hp 279tq
I doubt if the difference between 35 psi and 70 would make 5%
difference, but that is just a guess based on when I had my Dynojet. I
could see 1-2 hp difference at most, in a 10psi bump, but we never
recommended much over 5psi over factory recommendation due to the chance
of the tire exploding.
Modern radials have pretty low rolling resistance, and more pressure
doesn't make as much difference as it used to with bias ply tires.
I don't know of any passenger tires that say 50+ is safe. Especially at
100+ mph. With the tie-downs forcing the tire down, you can get a lot
of heat quickly.
Don Mallinson
Paul L Fisher wrote:
>OK. But what are we talking, 10%, 20%?
>
>
>Paul L Fisher
>
>Visit my website: http://www.paul-fisher.com
>Amsoil dealer: http://www.paul-fisher.com/oil
>
>
>-----Original Message-----
>From: shotimes-admin@autox.team.net [mailto:shotimes-admin@autox.team.net]
>On Behalf Of Bob
>Sent: Monday, September 04, 2006 3:44 PM
>To: shotimes@autox.team.net
>Subject: RE: [Shotimes] N/A Dyno 318hp 279tq
>
>Because it reduces driveline losses through the tires. Unless this is a
>salt car, 70 psi is twice normal inflation which will cause
>less rolling resistance via a smaller contact patch and less power will be
>absorbed by the normally flexing sidewalls. In the real
>world, 70 psi would leave the vehicle with significantly reduced traction,
>but in this case, the tie-downs prevent slippage. This
>throws off the load calculations and creates an unrealistic environment.
>Most likely, the tuning was done under real world
>conditions and then the owner told the operator to get some good numbers.
>
>If someone wants to use a dyno as a simulator so that tuning can be done,
>the general goal is to get the dyno variables as close to
>real world as possible. This would include a real world curb weight with
>1/2 tank gas and a driver.
>
> -- Bob
>
>
>
>>-----Original Message-----
>>From: Paul L Fisher [mailto:sho@paul-fisher.com]
>>Sent: Monday, September 04, 2006 1:03 PM
>>To: 'Bob'; shotimes@autox.team.net
>>Subject: RE: [Shotimes] N/A Dyno 318hp 279tq
>>
>>Huh?
>>
>>How does that increase your HP?
>>
>>
>>Paul L Fisher
>>
>>Visit my website: http://www.paul-fisher.com
>>Amsoil dealer: http://www.paul-fisher.com/oil
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