 Which is a better ratio for "first" in a V8?, A or F? |
|
|
|
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG.
This site is not affiliated with Porsche in any way. Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners. |
|
|
  |
| bondo |
 Sep 19 2004, 10:43 PM
Post
#1
|
|
Practicing my perpendicular parking  Group: Members Posts: 4,277 Joined: 19-April 03 From: Los Osos, CA Member No.: 587 Region Association: Central California  |
I have an A and an F (stock) mainshaft, which should I use for my V8 conversion? I think I know the answer, but I thought I'd get some confirmation. These are both ratios that would be in the second gear position, and not subject to the "cantilevered first gear" weakness. F is the stock second gear ratio, and is what most V8 conversions use. My gut feeling is that the A ratio (same as the stock 914 first gear) is way too low for a V8, but F seems a bit high (stock 914 second gear ratio)
I will be using an H flipped as "4th" gear (in place of 5th), and will be spacing out "2nd" and "3rd" based on the "1st" gear choice, using what gears I have. |
   |
 
|
| smrz914 |
Sep 19 2004, 11:06 PM
Post
#2
|
|
Soon to be brightening the life of the person behind you. Group: Members Posts: 456 Joined: 21-April 03 From: Pleasant Hill, CA or Chico, CA Member No.: 596 |
First gear in a 914 with a v8 is really low. Never used it never had a desire to. Not to mention you shouldn't use it. I think that the stock 2nd gear is a tad high but very usable. If your choices are to use a "1st" gear ratio vs "2nd" gear ratio i would go with the 2nd gear ratio. My engine has about 280 hp and 330 ft/lbs tq. I'm running a stock tranny (IMG:style_emoticons/default/sad.gif) . Use the second gear ratio.
|
|
|
|
| ArtechnikA |
Sep 20 2004, 03:24 AM
Post
#3
|
|
rich herzog Group: Members Posts: 7,390 Joined: 4-April 03 From: Salted Roads, PA Member No.: 513 Region Association: None |
or you could find an 'E' 2nd gear mainshaft ...
Charlie Davis' website shows the transmission type numbers that used the 'E' 2nd. cross-referencing those back to ccar models is left as an exercise to the student, but the information should be in Anderson, Barth's 'The Porsche Book' and 'Excellence was expected' ... |
|
|
|
| propricer |
Sep 20 2004, 08:12 AM
Post
#4
|
|
Member Group: Members Posts: 365 Joined: 16-April 04 From: Morgan Hill, CA Member No.: 1,938 |
1st is MUCH too low and will cause breakage.
Use 2nd ... MUCH smoother yet still allows burnouts, not that you would EVER do that !!! H conversion is also a GOOD idea. Good luck ... |
|
|
|
| Andyrew |
Sep 20 2004, 09:31 AM
Post
#5
|
|
Spooling.... Please wait Group: Members Posts: 13,376 Joined: 20-January 03 From: Riverbank, Ca Member No.: 172 Region Association: Northern California 
|
Currently, I broke my throttle cable... Sooooooo Im using a 2k idle, and first and second to get around the block.. Then just coast around at 15...
ahh the joys!!! |
|
|
|
| bondo |
Sep 20 2004, 10:04 AM
Post
#6
|
|
Practicing my perpendicular parking Group: Members Posts: 4,277 Joined: 19-April 03 From: Los Osos, CA Member No.: 587 Region Association: Central California |
Cool, thanks. That's pretty much what I thought, just wanted to hear it from others (IMG:style_emoticons/default/smile.gif)
That makes these my chosen ratios: "1st" F 18:34 "2nd" V flipped 25:27 "3rd" ZD 31:22 "4th" H flipped 32:19 Which, if I'm not mistaken is what they say to do anyways, which means all my math effort was a waste of time (IMG:style_emoticons/default/smile.gif) Looks like all I can use from the 912 4 speed is the H gear (and the nifty magnetic drain plug) Does anyone know if the intermediate plate or differential cover are interchangable? They are both aluminum and should be stronger. |
|
|
|
|
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:
|
Lo-Fi Version | Time is now: 16th May 2024 - 03:00 AM |
Invision Power Board
v9.1.4 © 2024 IPS, Inc.