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The Terminator
Driveline
Why are gears not popular with these cars?
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<blockquote data-quote="Jerryk" data-source="post: 1131926" data-attributes="member: 4259"><p>I have 3.90 gears and drag race it w/ ET Streets. I'm beginning to think I'm shifting at too high an RPM. I recently posted my last 3 passes, shifting at 6000, 6300 and 6500rpm. The best ET and MPH was @ 6000. 6500 caused a drop in ET of .08 and 1.74mph. I have never tried shifting at 5600 - 5900 but guess what I'm going to try next. The massive torque is down there and it MAY be that 3.90 gear is ideal (on 26" tire) IF you shift earlier (while torque is still hovering near 500lb/ft on a pullied car) and grab 4th in the 1/8th and 5th in the quarter. Gears, whether they be transmission or final drive gears, are a torque multiplier.. period. The evidence regarding optimum shift RPM is not well known so since we typically publish gear results w/o documenting shift RPM (and have the typical variances of density and driver skill) the evidence is inconclusive. I'm flying w/ 3.90 gears but only going .14 quicker then when I was on 3.55 gears and that variance was probably my slipping clutch. I never found optimum shift RPM w/ my 3.55 gears and I haven't found it yet w/ 3.90 gears. Once I do find optimum shift RPM w/ 3.90 gears I'll be wondering what could have been w/ 3.55, guess I'll have to try some 28" tall slicks <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink ;)" loading="lazy" data-shortname=";)" /></p></blockquote><p></p>
[QUOTE="Jerryk, post: 1131926, member: 4259"] I have 3.90 gears and drag race it w/ ET Streets. I'm beginning to think I'm shifting at too high an RPM. I recently posted my last 3 passes, shifting at 6000, 6300 and 6500rpm. The best ET and MPH was @ 6000. 6500 caused a drop in ET of .08 and 1.74mph. I have never tried shifting at 5600 - 5900 but guess what I'm going to try next. The massive torque is down there and it MAY be that 3.90 gear is ideal (on 26" tire) IF you shift earlier (while torque is still hovering near 500lb/ft on a pullied car) and grab 4th in the 1/8th and 5th in the quarter. Gears, whether they be transmission or final drive gears, are a torque multiplier.. period. The evidence regarding optimum shift RPM is not well known so since we typically publish gear results w/o documenting shift RPM (and have the typical variances of density and driver skill) the evidence is inconclusive. I'm flying w/ 3.90 gears but only going .14 quicker then when I was on 3.55 gears and that variance was probably my slipping clutch. I never found optimum shift RPM w/ my 3.55 gears and I haven't found it yet w/ 3.90 gears. Once I do find optimum shift RPM w/ 3.90 gears I'll be wondering what could have been w/ 3.55, guess I'll have to try some 28" tall slicks ;) [/QUOTE]
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Why are gears not popular with these cars?
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