Final Gear Change Recomendation
Thread Starter
Pro
Joined: Apr 1999
Posts: 533
Likes: 6
From: Poinciana Florida
Final Gear Change Recomendation
I'm about ready to make a last gasp and install a straight axle in my toy. With 600 rwhp and 190 more available I simply can' t put the power on the pavement running the 700R4. Others can but I can't. I've asked for gearing opinions from others and had comments ranging from 345's to 488's. If your running over 500rwhp with a 700R4 I'd appreciate your views.
Le Mans Master
Joined: Apr 2000
Posts: 5,713
Likes: 105
From: Manassas VA
Are you setting it up for drag racing? If so, 1/8 or 1/4? What are your trap speeds? There are several online calculators to help you decide what you need. IMO use a calculator and pick a gear that will allow you to trap about 200 rpm below your redline.
Thread Starter
Pro
Joined: Apr 1999
Posts: 533
Likes: 6
From: Poinciana Florida
bTechnically your correct. However in reality it doesn't work that way.
Thread Starter
Pro
Joined: Apr 1999
Posts: 533
Likes: 6
From: Poinciana Florida
I've been doing this for 50 years. IF you can avoid wheel spin the calculations do indeed help. However, lack of traction is the problem that causes the calculations to go out the window. I've played with various gear ratios up to and including 5:48's on the street@3mpg. Currently with the supercharged vette, 700R4, and 3:45's in the D44; traction takes place just prior to 3rd gear. Therefor would it be better to run a set of 3:23's or 3:08's. From my point of view, traction first and adjustments later. If your running an over powered Vette with a 700R4 your views are appreciated.
Racer
Joined: Jan 2012
Posts: 275
Likes: 26
From: Austin TX
If youre looking for traction just run a taller tire. If you step up from a 26" to a 28" it will mimic having a 3.23 gear and provide you with a longer contact patch for more traction. Would you consider a drag radial? What tire are you running now?
Race Director
Joined: Sep 2001
Posts: 14,680
Likes: 752
From: NEwhere Ohio
theres also another 'school of thought' where the less 'shifts' you have with a boosted car, the better it will be because the boost is not 'wasted' between shifts.
Someone needs to come up with a no-lift-shift device.
Someone needs to come up with a no-lift-shift device.
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Melting Slicks
Joined: Jul 2004
Posts: 3,277
Likes: 32
From: Mission Viejo California
I'm jealous of your 3.45's. Mine's over whelmed with the 3.73's. I want to run 200 mph in the mile but I can't realistically reach 180 with a 26" tire. What are you goals? If it's just controlling it, go to a 27" et street radial and it'll calm it down at that power level. If push comes to shove, get a 305 mt radial. It'll take more than you can push at it.
Team Owner
Joined: Aug 2004
Posts: 21,543
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From: Park City Utah