Location: Elmhurst, IL (West Suburb of Chicago) & Home of MEGA Horsepower
Whats it the lowest safe air pressure for et streets!
I have the ccw drag package with skinnies in front and tubeless et streets (26x11x16.5) for the dragstrip for my 98 C5 427 MTI car and i figure about 12lbs is the absolute lowest air pressure i can run with the et streets and still be 100% safe. What have the hardcore experts here experienced? What is the absolute lowest air pressure that you guys have run on tubelss et streets without jeopardizing any safety, etc? Keep in mind my car makes 480rwhp through its A4 4000 stalled tranny!
Thanks!!!
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2006 Black C6 Z06, black powder coated rims, CAI; B&B Bullet Exhaust, and of course 427 Badges ; Mopar Jimmy is back with a daily driver 2008 Dodge Challenger, 450hp Hemi SRT8, runs 12.7s with bolt ons, & a mean, Ralleye Green, 1969 Plymouth Road Runner machine, 600hp 505 ci, black steel wheels & black fiberglass 6-pack lift off hood. Thanks and Praise to GOD!
Last edited by Mopar Jimmy; 10-16-2004 at 01:23 AM.
The last time I went below 11 lbs.psi I almost hit the wall when the car went sideways off the launch.. ..NOT FUN.
I think 12 lbs.cold is a good compromise for a safe run..the front at 38-40 IMO is adequate.
Don't forget that the closer the successive runs are together a higher psi will stay in the tire when the heat stays in the tire.Now you maybe at 13-14..always check the pressure before you run..
Trial and error is really the only thing you can do. Each setup is going to want different pressure. I moved from M/T slicks that I ran at 13.5psi, and now the Hoosier's same size, I run at 17psi cold.
Rule if thumb is you want as much as possible, with no spin. The harder your tires are the quicker your 60' will be on equal bite. I might try 18psi cold tomorrow to see what it will yeild.
Same applies to suspension...hard as you can get it so long as you maintain traction.
In both the tires and suspension, any "extra" than needed movement is wasting energy that otherwise would be sending you in a forward motion.
The key however is finding the needed amount of movement
I make my first run with 12 PSI cold and bleed them down to 10.5 immediately after the run while they are still warm. I leave them alone after that. I've run as low as 10 PSI hot with no control problems. If the car trys to go sideways it's probably due to a burnout problem or parking the car where the sun heats up the tire on one side causing unequal pressures. My 60s run mid 1.4s on a well prepped track.
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02 Z06
Cartek forged 427 (LS7): Callies crankshaft, Manley rods, Diamond pistons, ETP 240 heads, Jesel shaft rockers, NX direct port fogger, NX Maximizer, LSX Fast Intake, Kooks headers & X-pipe, Meziere water pump, Coan TH400 & converter with pro trans-brake installed by RPM, CCW drag package, Line-lock, Neverlift roll bar, American Super Car Challenge Serious Street Champion 2005 & 6
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Whats it the lowest safe air pressure for et streets!
; Mopar Jimmy is back with a daily driver 2008 Dodge Challenger, 450hp Hemi SRT8, runs 12.7s with bolt ons, & a mean, Ralleye Green, 1969 Plymouth Road Runner machine, 600hp 505 ci, black steel wheels & black fiberglass 6-pack lift off hood. Thanks and Praise to GOD!
..NOT FUN.
2001 TR Z06 BPP VortexIntakeSystem Ripper Shifter WCC RearLens Bezels VaccessoriesGauge Bezels I/E decals S2Ported TB TPIS LT Headers Random Tech High flows & X pipe stock mufflers
