08-01-2014 | #151 |
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,698
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Re: 4.10 gears...not what I expected.
Paul,
Your results in the 1/2mile mimic how Lee and I ran with VERY similarly modded 92s several years ago at Byron. Lee got to the big end about .3-.4 quicker than me. His 1/8 trap was about 2 mph faster than mine, however I would gain on him in the second 1/8 (not enough to get around him) and our 1/4mile traps were virtually identical. Lee has 4.10s and I had the 3.45s
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[SIGPIC][/SIGPIC]Former Membership Chairman Former ZR-1 Registry - BOD 1972 Corvette 4speed base Coupe SOLD long time ago 1984 Corvette Z-51/4+3 SOLD 1992 Corvette ZR-1 Aqua/Gray #474 SOLD 1992 Corvette ZR-1 Black Rose/Cognac #458 2014 Honda VFR Interceptor DX |
08-01-2014 | #152 | |
Join Date: Feb 2014
Location: AZ
Posts: 860
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Re: 4.10 gears...not what I expected.
Quote:
Yes, I definitely like them better than I did at first. It sounds like we had similar experiences relative to inflated expectations. Once I came to grips with the fact that I had simply expected too much, I began evaluating the mod more objectively. The car moves away from a stop easier and feels more "drivable" in almost all circumstances. I'm happy with them now. Glad you are too! |
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08-01-2014 | #153 |
Join Date: Nov 2007
Location: Squires (near Ava MO in the Mark Twain N'tl Forest) - Missouri
Posts: 6,493
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Re: 4.10 gears...not what I expected.
It was a standing start, but with slightly less aggressive rpm and clutch release than typical of a "balls to the walls" quarter mile "ET" contest. This was for top-end primarily: not ET per se'.
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Good carz, good food, good friendz = the best of timez! 90 #1202 "FBI" top end ported & relieved Cam timing by "Pete the Greek" Sans secondaries Chip & dyno tuning by Haibeck Automotive SW headers, X-pipe, MF muffs Former Secretary, ZR-1 Net Registry |
08-01-2014 | #154 | |
Join Date: Sep 2012
Location: Rockwall, Tx
Posts: 1,510
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Re: 4.10 gears...not what I expected.
Quote:
Paul, I think with modded motors like ours the taller gears are fine. That's why I did 3.90's vs 4.10's. We have the power to pull those tall gears in 1st and 2nd. For the same reason if I added boost I would never do 3.90's or 4.10's. Don't need to. Shorter gears are a great equalizer when you are short on power. IMHO, the more power you have the less gear you need.
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08-01-2014 | #155 |
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,698
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Re: 4.10 gears...not what I expected.
I installed 3.73s for mine and when power is transmitted through 19" wheels, acts like a 3.55. I would be tempted to try 3.90s
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[SIGPIC][/SIGPIC]Former Membership Chairman Former ZR-1 Registry - BOD 1972 Corvette 4speed base Coupe SOLD long time ago 1984 Corvette Z-51/4+3 SOLD 1992 Corvette ZR-1 Aqua/Gray #474 SOLD 1992 Corvette ZR-1 Black Rose/Cognac #458 2014 Honda VFR Interceptor DX |
08-02-2014 | #156 | |
Join Date: Nov 2007
Location: Squires (near Ava MO in the Mark Twain N'tl Forest) - Missouri
Posts: 6,493
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Re: 4.10 gears...not what I expected.
Quote:
__________________
Good carz, good food, good friendz = the best of timez! 90 #1202 "FBI" top end ported & relieved Cam timing by "Pete the Greek" Sans secondaries Chip & dyno tuning by Haibeck Automotive SW headers, X-pipe, MF muffs Former Secretary, ZR-1 Net Registry |
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08-02-2014 | #157 |
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,698
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Re: 4.10 gears...not what I expected.
Paul,
Just to clarify, I'd consider 3.90's due to the 19" wheels. That would get me to a real world ~3.73. A 4.10 gets me to 3.90s. Having a 3.73 would be a nice compromise gear but its nothing compelling. Not sure it would even be that noticeable. When I had the stock 3.45s, my real gear was about a 3.30.
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[SIGPIC][/SIGPIC]Former Membership Chairman Former ZR-1 Registry - BOD 1972 Corvette 4speed base Coupe SOLD long time ago 1984 Corvette Z-51/4+3 SOLD 1992 Corvette ZR-1 Aqua/Gray #474 SOLD 1992 Corvette ZR-1 Black Rose/Cognac #458 2014 Honda VFR Interceptor DX |
08-02-2014 | #158 | |
Join Date: Nov 2007
Location: Squires (near Ava MO in the Mark Twain N'tl Forest) - Missouri
Posts: 6,493
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Re: 4.10 gears...not what I expected.
Quote:
*where d1 is the distance your new (bigger) wheels cover in one revolution vs. d2 the distance the stock 17" wheel/tire size covers in one revolution, and R1 being the stock 3.45 ratio.
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Good carz, good food, good friendz = the best of timez! 90 #1202 "FBI" top end ported & relieved Cam timing by "Pete the Greek" Sans secondaries Chip & dyno tuning by Haibeck Automotive SW headers, X-pipe, MF muffs Former Secretary, ZR-1 Net Registry Last edited by Paul Workman; 08-03-2014 at 06:10 AM. Reason: for clarification |
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08-02-2014 | #159 | |
Join Date: Oct 2004
Posts: 1,889
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Re: 4.10 gears...not what I expected.
Quote:
19" wheels don't have anything to do with ratio's either and you constantly mention that. There is absolutely no truth to the conversation of yours that I just quoted. If you want to discuss final drive ratio mention the tire specifications, rear gear and people can maybe relate better. You might try referring to the tire dimension change as effective ratio and mention the tire dimensions (real measured vs. advertised) and it could more easily be understood. I don't recall you mentioning the tire size but maybe just once, that's the real relevance for comparisons 15", 16" 17" or 20" wheels have no effect on any of it. It's the 'outer circle'. Last edited by WVZR-1; 08-02-2014 at 11:36 AM. |
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08-02-2014 | #160 |
Join Date: Aug 2005
Location: Northridge, CA
Posts: 1,457
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Re: 4.10 gears...not what I expected.
This gear ratio discussion has my head (and tires) spinning!
R R R |
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