NEED MORE GEARS
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IDT-572
dfree383
cool40
D. Sea
Larry Williams
powerstrokeace
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NEED MORE GEARS
powerstrokeace June 23rd 2014, 12:32 pm
GUY'S I HAVE BEEN THINKING THAT WE NEED TO SWITCH FROM 4:11 TO MAYBE 4:33. WE ONLY CROSS THE FINISH LINE JUST AT 6900RPMS.
ACE
ACE
powerstrokeace- Posts : 1496
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Re: NEED MORE GEARS
Larry Williams June 23rd 2014, 2:18 pm
this is something I copied off this board a few years ago.
if your unsure about your gear ratio, take your et x's your mph = ?
if your answer is less than 1335 you need a lower gear ratio
if your answer is more than 1335 , you need a higher gear ratio
if your answer is with in 10- 15 its close enough unless you need every bit of et
if your unsure about your gear ratio, take your et x's your mph = ?
if your answer is less than 1335 you need a lower gear ratio
if your answer is more than 1335 , you need a higher gear ratio
if your answer is with in 10- 15 its close enough unless you need every bit of et
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cool40- BBF CONTRIBUTOR
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Re: NEED MORE GEARS
dfree383 June 23rd 2014, 4:14 pm
cool40 wrote:That dont figure for me....
That's because you're special......
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Re: NEED MORE GEARS
IDT-572 June 23rd 2014, 5:19 pm
Dang if my gear is off that much, tha Fabiol is in biiiiig trouble. Lol
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Re: NEED MORE GEARS
rmcomprandy June 23rd 2014, 5:25 pm
It is only meant to get close and work with 1/4 mile times, guys.
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Re: NEED MORE GEARS
cool40 June 23rd 2014, 6:04 pm
so we need to x2 for 1/8 mile? I'm at 1410 that way...rmcomprandy wrote:It is only meant to get close and work with 1/4 mile times, guys.
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Re: NEED MORE GEARS
rmcomprandy June 23rd 2014, 7:10 pm
cool40 wrote:so we need to x2 for 1/8 mile? I'm at 1410 that way...rmcomprandy wrote:It is only meant to get close and work with 1/4 mile times, guys.
The curve from 1/4 mile to 1/8 mile is NOT linear so x2 won't be right. The second eighth mile you would not be starting at a standing start and low speed compared to high speed acceleration is not near the same.
EDIT: Six seconds in the 1/8 is not hear twelve seconds in a 1/4 mile and 100 MPH 1/8 mile won't be near 200 MPH in a 1/4 mile, either.
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Re: NEED MORE GEARS
JACKAZZFLATZ June 24th 2014, 9:51 am
WHOA, 1331.7 for me. Good guessing ..... I guess.
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Re: NEED MORE GEARS
IDT-572 June 24th 2014, 3:47 pm
I have 200 hp worth of Steve's cowbell on it now. Just need to get to the track to dial it in. Last time I tried it was at the US 43 race. 
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Re: NEED MORE GEARS
powerstrokeace June 25th 2014, 12:22 am
ok just looked at the best runs and this is what i came up with using this math. 1332.483 for the 557 hard tail car and 1339.65 for the 555 4 link car. guess i'll stick with the 4:11 for now. would like to try a 4:33 gear just for grins
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powerstrokeace- Posts : 1496
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Re: NEED MORE GEARS
KY JELLY June 25th 2014, 12:39 am
I have changed back and forth from 4:30 to 4:86 gears with a 105 circ with several different engines and converters. Every time the 4:86 has been quicker and finish line rpm changes very little . The lower gear doesn't slip the converter as much .
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