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#1 |
Drag Racer!
Join Date: Nov 1999
Location: Lake Worth, FL USA
Posts: 757
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![]() Back in early August I destroyed my stock 28 spline differential and at that point I decided to replace my gears while installing my new axles and differential. I switched over from 4.10s to 4.30s. Finally after weeks of other problems I was able to get in a handful of consistent passes down the track to prove any difference in ET's. Now my intial thoughts were that I would see an improvement roughly of .03-.05 in 60ft time which would translate into the same difference at the top end.
The passes below with 4.10s were made back in July over a span of 6 passes during two different trips. Weather conditions during my 4.10 passes were 82* and 80% humidity both nights. The weather the last two nights with 4.30s was 81* and 85-86% humidity. Avg 4.10 4.30 Difference 60' 1.753 1.718 -.035 330' 5.303 5.282 -.021 1/8 8.284 8.268 -.016 MPH 82.06 81.64 -.42 1000' 10.866 10.858 -.008 1/4 13.057 13.046 -.011 MPH 104.04 102.96 -1.08 With 4.10s my best 60ft was a 1.66 but that was on one occassion in 60* weather and averaged very close to what is listed above. Since going to 4.30s I've stayed very consistantly at low 1.7's with a best of 1.691 tonight. So in my opinion unless you damage your gears or have to replace your gears otherwise you won't see that much of a gain in ET's. I think once the weather drops a little more I'll see a little more improvement but for the most part I picked up about 3 hundreths or so in my 60 foot times. I'm not to concerned with my loss in MPH, since some of that is due to the gears the rest I figure it from the worse humidty and my one blown out muffler. My personal opinion is that the car feels like it is leaving much harder off the line versus the 4.10s and the 1-2 comes very quick and it even pulls both wheels now (got video footage ![]() Bill ------------------ 00 GT, MAC Offroad H, Steeda Pulleys & Timing Adjuster, C&L 80mm, 4.30’s, Flows w/turndowns, UPR shifter, UPR Pro Series LCA’s, Lakewood 70/30’s & 50/50’s, 253.8 RWHP/292.8RWTQ Best ET 12.91 Best MPH 105.49 M/M 100, 7085 2001 Mod Motor Shootout 2V NA Champion |
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#2 |
Registered Member
Join Date: Apr 2001
Location: Sterling Heights,Michigan
Posts: 129
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![]() Mustang92 how much of a difference should I see when I change out my 3.73 for a set of 4.30?
Will ------------------ 98Cobra-3.73,Offroad Xpipe,Flowmasters,Mac Cold air,SteedaTiming Adjuster16deg,Autometer Shiftlight,NittoDragRadials 60ft-2.013 1/8-8.488 mph-85.170 1/4-13.123 mph-106.148 |
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#3 |
Drag Racer!
Join Date: Nov 1999
Location: Lake Worth, FL USA
Posts: 757
|
![]() Assuming your using street tires I wouldn't expect much of an improvement. If you step up to DR's I'd say you would knock off roughly .1 - .15 in your 60 foot times. Then changing to 4.30s I'd think you would pick up about .15 - .25 in your ET's.
Bill |
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#4 |
I need 110mph Trap Speed!
Join Date: Feb 1999
Location: So, CA
Posts: 4,315
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![]() Interesting and excellent comparison
I always enjoy reading stuff like this. Skyler ------------------ -1989 Saleen Mustang #406- TFS TW Heads, E-303, Edelbrock intake, 70mm TB, 73mm MAF, 24lb injectors, 1 5/8 shorties, Off Road H, 3 Chamber flows, Jaz Race seats, Back seat removed, sub-frames, Roll Cage, and a 80 shot of N20. 12.54@107.4 Motor 332RWHP, 350rwtq |
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