Home  |  Forums  |  914 Info  |  Blogs
 
914World.com - The fastest growing online 914 community!
 
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.
 

Welcome Guest ( Log In | Register )

2 Pages V  1 2 >  
 Reply to this topicStart new topic
> Transmission Out, Changing Gears
jfort
post Jan 16 2023, 10:51 AM
Post #1


Senior Member
***

Group: Members
Posts: 1,135
Joined: 5-May 03
From: Findlay, OH
Member No.: 652
Region Association: Upper MidWest
My Notes:

The car was sold to me 15 years ago with the representation that it had M S X for gears 3, 4 and 5

Actually, yesterday, we discovered what was in there was MSV. Thus 5 gear was way too short — only 8 mph difference from 4th. Stampings on the 5th gear are confusing so that the mistake may not have been deliberate. But it is definitely a V as it had 26 teeth.

We are going to change to M, V, ZD. ZD has 34 teeth.

The set up of V to ZD for 4th and 5th is the stock set up so it should be a good spread and about 1,000 RPM slower at 70 MPH from the prior set up.

Second gear is F 18:34 which is correct

Rebuild needs: first gear synchro. Third gear, synchro. Fourth gear synchro. In summary, we’ll buy five synchros. 1st/reverse operating sleeve. Pinion shaft bearing in the intermediate plate
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
jfort
post Jan 16 2023, 10:56 AM
Post #2


Senior Member
***

Group: Members
Posts: 1,135
Joined: 5-May 03
From: Findlay, OH
Member No.: 652
Region Association: Upper MidWest
My wife likes to do the work. I think ahead and hand her the tools. Then, to Jay Kjoller's shop to take it apart and determine what is needed. I wanted a long 5th gear and finally got around to doing it.

Attached Image

Attached Image

Attached Image

Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
jfort
post Jan 16 2023, 11:00 AM
Post #3


Senior Member
***

Group: Members
Posts: 1,135
Joined: 5-May 03
From: Findlay, OH
Member No.: 652
Region Association: Upper MidWest
I am exceedingly lucky to have a wife who likes to get her hands dirty and an expert like Jay Kjoller. He is a wealth of knowledge and experience. Anything air cooled.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
jfort
post Jan 16 2023, 11:10 AM
Post #4


Senior Member
***

Group: Members
Posts: 1,135
Joined: 5-May 03
From: Findlay, OH
Member No.: 652
Region Association: Upper MidWest
And cleans up well:

Attached Image

Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
jfort
post Jan 16 2023, 11:12 AM
Post #5


Senior Member
***

Group: Members
Posts: 1,135
Joined: 5-May 03
From: Findlay, OH
Member No.: 652
Region Association: Upper MidWest
spreadsheet showing new M V ZD setup:

Attached File  M_V_ZD.pdf ( 74.1k ) Number of downloads: 61
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
slivel
post Jan 16 2023, 11:53 AM
Post #6


Old car....... older driver
***

Group: Members
Posts: 508
Joined: 10-July 04
From: San Diego
Member No.: 2,332
Region Association: Southern California
That's a nice gear selection for your application. I should move to something similar for mine but the car just doesn't get driven enough to justify the effort. What tire are you running? My trans has a "Y" top gear and Toyo 245/45/16 with diameter of 24.7" is 71 mph at 3500 rpm in 5th.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
rbzymek
post Jan 16 2023, 12:25 PM
Post #7


Member
**

Group: Members
Posts: 195
Joined: 5-April 19
From: Northville, MI
Member No.: 23,013
Region Association: Upper MidWest
I have a "while I'm in there question" on gear ratio's. Since I up sized to the 2056 first gear feels short. Is there a recommendation out there for a different first gear set? Maybe not possible given the 1/R design. Or should I shorten 2nd and not use first? Or leave it alone so as not to screw it up? Thanks.

Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
brant
post Jan 16 2023, 12:31 PM
Post #8


914 Wizard
**********

Group: Members
Posts: 11,623
Joined: 30-December 02
From: Colorado
Member No.: 47
Region Association: Rocky Mountains
QUOTE(rbzymek @ Jan 16 2023, 11:25 AM) *

I have a "while I'm in there question" on gear ratio's. Since I up sized to the 2056 first gear feels short. Is there a recommendation out there for a different first gear set? Maybe not possible given the 1/R design. Or should I shorten 2nd and not use first? Or leave it alone so as not to screw it up? Thanks.

Attached Image



I have my 2nd in first
It’s not something you can do yourself
You lose reverse. And have to weld the case window in mag alloy
Very expensive as you need a 904 shaft and as I said you lose the reverse
Race only
User is online!Profile CardPM
Go to the top of the page
+Quote Post
rbzymek
post Jan 16 2023, 12:36 PM
Post #9


Member
**

Group: Members
Posts: 195
Joined: 5-April 19
From: Northville, MI
Member No.: 23,013
Region Association: Upper MidWest
Thanks for the info. Obviously not an option for this street driver.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
brant
post Jan 16 2023, 01:33 PM
Post #10


914 Wizard
**********

Group: Members
Posts: 11,623
Joined: 30-December 02
From: Colorado
Member No.: 47
Region Association: Rocky Mountains
The stock 2nd gear is fixed onto the shaft
So your options are to use it
Or buy a GA main shaft or a 904 shaft
User is online!Profile CardPM
Go to the top of the page
+Quote Post
brant
post Jan 16 2023, 01:35 PM
Post #11


914 Wizard
**********

Group: Members
Posts: 11,623
Joined: 30-December 02
From: Colorado
Member No.: 47
Region Association: Rocky Mountains
You need a dyno sheet and the longest straight away to design/pick a set of gears
User is online!Profile CardPM
Go to the top of the page
+Quote Post
infraredcalvin
post Jan 16 2023, 02:48 PM
Post #12


Distracted Member
***

Group: Members
Posts: 1,513
Joined: 25-August 08
From: Ladera Ranch, CA
Member No.: 9,463
Region Association: Southern California
That spreadsheet looks helpful, do you mind sharing the excel file?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Al Meredith
post Jan 16 2023, 03:24 PM
Post #13


Senior Member
***

Group: Members
Posts: 960
Joined: 4-November 04
From: Atlanta, ga
Member No.: 3,061
Go to "WWW.COGSGEARS.COM" Joe has some charts there.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
GregAmy
post Jan 16 2023, 03:36 PM
Post #14


Advanced Member
****

Group: Members
Posts: 2,296
Joined: 22-February 13
From: Middletown CT
Member No.: 15,565
Region Association: North East States
http://www.914world.com/specs/regearing_901.php

https://blueskymotorsports.com/901%20Series...ransmission.pdf
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Dr Evil
post Jan 16 2023, 04:43 PM
Post #15


Send me your transmission!
***************

Group: Members
Posts: 22,995
Joined: 21-November 03
From: Loveland, OH 45140
Member No.: 1,372
Region Association: MidAtlantic Region
I have all the parts you need, and a few 904 shafts for those feeling really adventurous.

The stock 914 all had A, F, N, V, ZD so changing your 5th to ZD is back to stock. No need to really do much else. M 3rd will be taller than N so 2-3 will have a wider spread than stock.

On the freeway, the MSX boxes are not pleasant. They are better for AX.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
wndsrfr
post Jan 16 2023, 09:05 PM
Post #16


Senior Member
***

Group: Members
Posts: 1,429
Joined: 30-April 09
From: Rescue, Virginia
Member No.: 10,318
Region Association: MidAtlantic Region
Gotta chime in here....consider getting a "S" for 4th and do the 3-5 swap to get A /F/ KA/ S /Z....it's a very pleasing spirited setup and keeps the revs up nicely in 5th...
User is online!Profile CardPM
Go to the top of the page
+Quote Post
infraredcalvin
post Jan 16 2023, 09:51 PM
Post #17


Distracted Member
***

Group: Members
Posts: 1,513
Joined: 25-August 08
From: Ladera Ranch, CA
Member No.: 9,463
Region Association: Southern California
QUOTE(Al Meredith @ Jan 16 2023, 01:24 PM) *

Go to "WWW.COGSGEARS.COM" Joe has some charts there.


Whoops, slight correction, googled joe cogs and this came up:

www.cogscogs.com

Thanks!
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
targa72e
post Jan 16 2023, 11:37 PM
Post #18


Member
**

Group: Members
Posts: 262
Joined: 11-September 16
From: colorado
Member No.: 20,392
Region Association: None
I did the ZD and S swap as well. I am running A,F, Flipped ZD (KA), S and ZD for 5th. My car is a -6 conversion (2.5L) and I really like the close spaced 2,3,4 for driving around on the street and ZD for highway. I am running 195/65-15 tires.

john
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
ClayPerrine
post Jan 17 2023, 06:40 AM
Post #19


Life's been good to me so far.....
***************

Group: Admin
Posts: 15,459
Joined: 11-September 03
From: Hurst, TX.
Member No.: 1,143
Region Association: NineFourteenerVille
In the orange car, we had a flipped H for 5th. With 205/50-15 tires, it helps with the freeway RPM and makes it nicer to drive.

With the 2.4L and the 901 trans, I had A-F-flipped ZD-S-ZD in it. It kept the RPMs up on the engine so it wouldn't overheat. I had a flipped HB in there, but I couldn't drive 60 mph without overheating. The fan wasn't spinning fast enough to keep it cool.

Clay
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Dave_Darling
post Jan 17 2023, 05:02 PM
Post #20


914 Idiot
**********

Group: Members
Posts: 14,984
Joined: 9-January 03
From: Silicon Valley / Kailua-Kona
Member No.: 121
Region Association: Northern California
Supposedly the reason that the stock Six had a lower 5th gear was to keep the cooling fan running faster on the freeway. So you're not the only one to run into that.

--DD
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
« Next Oldest · 914World Garage · Next Newest »
 

2 Pages V  1 2 >
Reply to this topicStart new topic
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:

 

Display Mode: Standard · Switch to: Linear+ · Switch to: Outline

Track this topic · Email this topic · Print this topic · Subscribe to this forum

- Lo-Fi Version Time is now: 13th May 2024 - 08:18 PM
Invision Power Board v9.1.4 © 2024  IPS, Inc.
All rights reserved 914World.com © since 2002
914World.com is the fastest growing online 914 community!
We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ...