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Frontrunner pressure question
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DRR S/Pro
Picture of CURTIS REED
posted
How low of a pressure can I run safely in 26" MT fronts with 967lbs on the front? Anyone with any experience in lightweight cars dropping pressure enough to change reactions?
 
Posts: 3481 | Location: KIEFER, OK. | Registered: August 17, 2007Reply With QuoteReport This Post
DRR Sportsman
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I have been from 25# to 45#. For me 2350# car leaving on trans brake. 10# in pressure is about 7 to 8 thou in react.


ep- hope this helps
 
Posts: 817 | Location: dodging double wides... | Registered: November 28, 2007Reply With QuoteReport This Post
DRR S/Pro
Picture of CURTIS REED
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Thanks EP. Wasn't sure how low I could safely go. I will drop down to 25lbs this weekend and see where I'm at. I was -.005, -.014, -.012 and I made an rpm change instead of fronts. Of course it was in my head and I was .065 2nd round. LOL
 
Posts: 3481 | Location: KIEFER, OK. | Registered: August 17, 2007Reply With QuoteReport This Post
DRR S/Pro
Picture of Lenny5160
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I don't have any numbers, but I'd bet a pressure change in the slicks would be equally or more impactful.

I only use RPM to adjust R/T.


Tony Leonard
 
Posts: 3342 | Location: Inver Grove Heights, MN | Registered: March 18, 2004Reply With QuoteReport This Post
DRR S/Pro
Picture of CURTIS REED
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Tony, I used to make adjustments to my slicks when I ran Hoosier. They didn't care about a half pound or more one way or another. I'm on MT now and they seem to be more finicky about pressure although they are stupid good for consistency.

I just haven't been able to test with them enough to know what I can get away with or how much a difference what pressure makes. All but 2 passes have been at races.

.
 
Posts: 3481 | Location: KIEFER, OK. | Registered: August 17, 2007Reply With QuoteReport This Post
DRR Top Comp
Picture of Curly1
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I have ran under 20 up front on my altered with no problems but I do not recommend it. Use RPM if you can. 25 PSI should be no problem as light as your front is.


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Posts: 4609 | Location: United States of Texas | Registered: April 02, 2011Reply With QuoteReport This Post
DRR Sportsman
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I see little to no difference in rear pressure. But will see some with front psi.

ep
 
Posts: 817 | Location: dodging double wides... | Registered: November 28, 2007Reply With QuoteReport This Post



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