 Taller fifth gear, Substituting a flipped HB gear in fifth |
|
|
|
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. |
|
|
| bluhun |
 Feb 24 2013, 04:52 AM
Post
#1
|
|
Member  Group: Members Posts: 91 Joined: 23-January 06 From: San Rafael, CA Member No.: 5,464 Region Association: Northern California  |
At the Bay Area meet last week, one owner who is planning a 3.2 liter six conversion also talked about substituting a flipped HB (19:31) gear in fifth in place of the standard ZD (31:22) in order to lower engine revs at highway cruising speed and increase fuel economy. Does anyone have any experience with this transmission modification?
|
   |
 
|
  |
Replies
| Luke M |
Feb 24 2013, 08:59 AM
Post
#2
|
|
Senior Member Group: Members Posts: 1,497 Joined: 8-February 05 From: WNY Member No.: 3,574 Region Association: North East States 
|
Dr. Evil would be the guy to answer this question.
I have a box that has the 3 rd & 5th gear swapped around in it. It makes for a short 3 rd & 5 th gears. I had it in my 70 914 1.7 in the early 90's. It was ok for the auto x and short race tracks. I feel that it wasn't good for street driving as 5 th gear was short and gas mileage suffered. I plan to hit up Dr. Evil when it's time to get my 6 back on the road. I'd like a nicely geared side shift box to go with my 2.7 RS spec engine. |
|
|
|
Posts in this topic
bluhun Taller fifth gear Feb 24 2013, 04:52 AM
Mark Henry Talk to Dr. Evil
I'm doing the same I thing H ... Feb 24 2013, 09:36 AM RonW thats an interesting idea, i hadn't heard of t... Feb 24 2013, 09:44 AM partwerks I think it was an H gear that was used in mine. An... Feb 24 2013, 09:59 AM toon1
I think it was an H gear that was used in mine. A... Feb 24 2013, 10:16 AM kg6dxn I had an H gear with my V8 and Turbo rotary.
With... Feb 24 2013, 10:24 AM Mark Henry I guess it's HA and HB, mine is the HB which i... Feb 24 2013, 10:29 AM toon1
I guess it's HA and HB, I think mine might be... Feb 24 2013, 11:25 AM
Mark Henry
[quote name='Mark Henry' post='1825319' date='Feb... Feb 24 2013, 12:46 PM RonW this is a site i look up gearing
http://www.blues... Feb 24 2013, 12:56 PM shoguneagle There also threads via research which does discus... Feb 24 2013, 01:02 PM |
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:
|
Lo-Fi Version | Time is now: 2nd April 2026 - 11:53 AM |
Invision Power Board
v9.1.4 © 2026 IPS, Inc.