? on launch RPM with drag radials - Racing Forum

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? on launch RPM with drag radials
Wednesday, May 20, 2009 3:19 PM
Just curious what other people have found to work.

Last year was the first year with my Hoosier 225/50r16 drag radials. Last year I ran it around 6 times and my best launches were around 3000rpm.

This year is a new world. Over the winter my car recieved an M45 with the 2.7" pulley boys pulley and LSJ injectors.

I have ran once this year thusfar. Got 2 runs in before the event rained out.

The first run I launched at 2000 and it bascially bucked back and forth off the line.

The second I launched at 2500 and it hooked and bogged.

I am not going through the wet box. Just pulling beside it and squeaking the tires off twice each run before staging. The tires are gripping fine.

My fear is if I launch at the higher peak torque range (4400) that I will in deed snap an axle or blow up a cv joint.

Edited 1 time(s). Last edited Wednesday, May 20, 2009 9:09 PM



Re: ? on launch RPM with drag radials
Wednesday, May 20, 2009 4:09 PM
I used to launch my eco at 5400rpm.

finesse the clutch, thats the key.
slip it fast but not enough to bog the engine. You want a little bit of tire squeal as you leave the line.

breaking parts goes with racing, but worry about it when and if they break






Re: ? on launch RPM with drag radials
Wednesday, May 20, 2009 5:20 PM
Racing at Bandimere? I love it there, great track. Gotta love racing at 5800 ft. Been there a few times this year and my best launches seem to be right around 45-4800 rpm. This was on street tires though.
Re: ? on launch RPM with drag radials
Wednesday, May 20, 2009 5:38 PM
5400 off the 2step. About 10psi before I'm even moving...good times.

Tires - Hoosier Quick Time Pro, 26x9.5 R16


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4 Cams...32 Valves...5 Liters...This Could Get Fun!


Re: ? on launch RPM with drag radials
Friday, May 22, 2009 5:58 PM
you really should be heating those up. i've found that my nittos hook waaaayyyyy better with a long 2nd gear burnout. i launch at about 4000-4500.



87 Firebird
All stock...........lol.
Re: ? on launch RPM with drag radials
Friday, May 22, 2009 7:44 PM
yea def forgot to mention that

do a lil burnout before pulling up to the line. don't burn the crap out of them tho just get a decent cloud comin up then stage.

DRs need to be heated up, but not as much as slicks do.






Re: ? on launch RPM with drag radials
Wednesday, May 27, 2009 9:22 AM
What kind of 60' times are you guys pulling lauching around 4400?


Re: ? on launch RPM with drag radials
Wednesday, May 27, 2009 10:10 PM
I wouldn't launch them that high I'd say 3500 at the most.

If they were bias ply tires that wrinkle wall, then, yeah take them to 5000... But radials I don't think it'll work that well.


11.92 @ 122.69 MPH Rotrex Blower / Intercooled / Water-Meth / 100% Daily Driver / 381 WHP


Re: ? on launch RPM with drag radials
Saturday, May 30, 2009 8:25 PM
when I had 195 70r14 reg tires on my front steelies, I would launch around 4000 and cut pretty consistent 2.1s and a few 2.0s

when I switched to radials and 15s up front, I got much more consistent 2.0s and after I added launch control (5400 rpm) I started dipping into 1.9s





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