 Transmission gearing advice needed, I have some choices to make |
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| DNHunt |
 Oct 4 2009, 08:43 AM
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#1
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914 Wizard? No way. I got too much to learn.  Group: Members Posts: 4,099 Joined: 21-April 03 From: Gig Harbor, WA Member No.: 598  |
2380 Type IV, redline at 7000. Best power from about 3600 to about 6200. Street car some AX. 205 15 tires street and R compound. With the stock box on the AX courses we run 3rd is just too tall so I know I want a shorter 3rd. ZD 5th is just right or a little low for the highway so I don't want to change that. So I can change 3rd and 4th.
I tore down a 902/02 tranny and got M, S, X and I have N, V, ZD from the stock box. I'm tempted to build a A, F, M, S, ZD box. I could build a A, F, M, V, ZD box. To complicate it more I know where there is a brand new L gear with hub. I am really tempted to build a A, F, L, S, ZD box. I think it makes the most sense to stretch from 4th to 5th. What do you think? Dave |
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| J P Stein |
Oct 4 2009, 09:16 AM
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#2
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Irrelevant old fart Group: Members Posts: 8,797 Joined: 30-December 02 From: Vancouver, WA Member No.: 45 Region Association: None |
I have a very nice GA 2nd F/S. That is good to 60MPH @ 7k.
The Flipped ZD is good to around 75 @ 7K and the shift drops right into the guts of your power band. That will cover 98% of the autocrosses you'll find. This would leave a pretty big spacing to 4th, I realize, but so what. 4 & 5 are basically cruise gears on the road. Your motor has good torque, use it. Short of going to a 904 mainshaft and a C first there's not much to be done with 1 & 2. Frankly, these gears really suck for a built motor. They louse up the whole box. |
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Posts in this topic
DNHunt Transmission gearing advice needed Oct 4 2009, 08:43 AM
DNHunt Ah JP, my favorite adviser. You always give me goo... Oct 4 2009, 09:51 AM race914 Here are a couple of model runs. These help me to... Oct 4 2009, 09:56 AM J P Stein We do use F 2nd to launch and the flipped 5th. The... Oct 4 2009, 12:36 PM ConeDodger JP has given you solid advice since you seem to dr... Oct 4 2009, 09:52 PM charliew I must have missed the tire diameter. I for some r... Oct 5 2009, 12:28 PM r_towle leave 4th and 5th alone...you need them to drive t... Oct 5 2009, 01:43 PM J P Stein A 205 X 50 X 15 is about 22.5" in diameter...... Oct 5 2009, 02:16 PM r_towle I had the flipped setup for a few years...its real... Oct 5 2009, 04:04 PM
J P Stein
I had the flipped setup for a few years...its rea... Oct 5 2009, 08:30 PM ChrisNPDrider Wow, nice collection of extra gears :beer2:
I did... Oct 5 2009, 09:00 PM |
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