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Drag Racing The place to discuss information about drag racing stats, tips and events. Track sanctioned events only.
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06-28-2011, 10:06 AM
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Focus Enthusiast
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1/4 mile not making sense?? Help!
Had two runs yesterday. First was 15.82 @ 93.8mph. Second was 15.87 @ 92 MPH. I have 17's on my car with oversized tires. 215/50/17, so there off by 4% or so. All variables aside, if I switch back to the correct diameter of tire, shouldn't it drop bother numbers down? I guess I'm happy about the 92/93.8 mph, but not the time.
Short question, By changing to a small diameter (going back to original diamter), what gains/losses whould I see. Thanks in advance! |
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Focus Fanatic
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06-28-2011, 10:17 AM
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#2 | ||||
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BACON?
 
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when decreasing the tires diameter, you should see a torque gain. Basically it would make your gear ratio lower. quicker acceleration but lower top speed. I do not know how much difference a 5% change in aspect ratio will make. 96mm vs 107mm pretty close.
__________________
2004 svt focus EAP #658 1986 Chevy M1008- new(to me) motor going in, 6.5l sleeping for winter then HX40... Hatch Nation #08 |
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06-28-2011, 10:18 AM
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Focus Addict
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it should lower your times, but we need more info then just et... i can't get traction for the life of me and can spin straight threw 1st gear.
also if the smaller tires have less grip you will probably run slower.0.1 sec off your 60ft is usually 02-0.3 off your et. |
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06-28-2011, 10:22 AM
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Focus Enthusiast
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My new tires stick very well, but there a 50 series tire, not the correct 45 series. After all the things i've changed on the car, it still takes 15.8. This sucks. Someone has to know the best set up for a 1/4 mile run.
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06-28-2011, 10:25 AM
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Focus Addict
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slicks.
whats the rest of the time slip? i ran a 15.7 w/ a 2.43 60ft 87.6mph ran a 16.8 w/ a 2.87 60ft 87.4mph i have to take off like i would at a stop light or a just light up the tires and spin. put drag slicks or a radial and knock my 60ft's to 2.0 or less and ill probably net 14's |
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06-28-2011, 11:07 AM
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Focus Enthusiast
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what was your 60 ft times?
__________________
2004 Sonic Blue SVT, 1,185 of 1,978, K&N Filter, Steeda Tri-Ax, Steeda Front Strut bar,Eibach Sway Bars, Fog-Light Mod, Yellow Fogs 1990 Mustang LX 5.0L, Project/race car Vortech'd, DSS Forged 331ci Stroker, 10psi www.ajsracing.net |
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06-28-2011, 11:22 AM
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FF Affiliate
 
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Quote:
Tom
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Focus-Power: Your #1 Source for Ford Focus Speed, Tuning & Performance! Customer Support AIM: hpdyno Email: tom@focus-power.com Phone: 704-249-3745 Site: focus-power.com Elder 1turbofocus |
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06-28-2011, 12:25 PM
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I Fab Too Much
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OMG get that 60ft down and the ET will go down also.
Post the rest of the slip please
__________________
New: 2012 Mustang GT premium SOLD:RACE GAS 602whp 501tq Pump Gas SAE 454whp Garrett GT3582r, Topmount, built motor, Ported head,Tuned by Fernando@RacingPartsSolution I may not be the baddest, but the baddest dont Fu** with me |
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