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> 914 901 Gear Ratios, Tech Article, Gear Ratio Workbook, Member Gear Set Library
race914
post Jan 14 2008, 10:44 AM
Post #1


73 914-4
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Posts: 1,006
Joined: 31-October 05
From: Nipomo, California (Central Coast)
Member No.: 5,027
Region Association: Central California



To maximize my 914's performance on the track, I've put together several different gear sets for my 901. This has helped me to maximize my top speed on the straights, as well as acceleration out of the corners. This has proved to be a great advantage over stock geared 914s.

I want share the info I’ve collected, as well as what I’ve learned from these projects.

I’ve put together a Attached Image Gear Ratio Tech Article that includes: why you might consider re-gearing; ways to approach this project; the 914 901 Gear Ratio Workbook (MS Excel required); and references to 914World members that provide related products & services.

Lastly, and perhaps most importantly, I’ll be maintaining the Member Gear Set Library that includes the various gear ratio setups that Members are using for different applications & situations. This centralized repository will greatly facilitate finding information applicable to your re-gearing project. Important Note! The ‘right’ gear set for you is particular to many factors. To list a few, the car’s weight, suspension, engine, and DRIVER! Don’t take the gear-sets listed for a particular application as your ideal setup. Contact the owner, compare corner speeds, suspension setups, engine characteristics, driving skills, etc. All of these factors play into what will work for you.

If you'd like to contribute to the "Member Gear Set library", post your info on this thread and include:

* Applicable Category (Autocross, Street, Track (including track name)
* Engine (cc & cylinders),
* HP,
* Redline RPM,
* Tire Diameter,
* Weight w/driver,
* 1st-5th gear codes, and
* Any short comment that you’d like to pass on, or better yet, a link to the applicable 914World discussion thread on your setup
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Posts in this topic
race914   914 901 Gear Ratios   Jan 14 2008, 10:44 AM
neilca   This is for road racing at Road Atlanta and Roebli...   Jan 14 2008, 02:46 PM
neilca   This is for road racing at Road Atlanta and Roebl...   Aug 17 2010, 06:56 AM
tomburdge   This is for road racing at Road Atlanta and Roeb...   Aug 17 2010, 02:03 PM
neilca   [quote name='neilca' post='1357366' date='Aug 17 ...   Aug 20 2010, 06:43 AM
stownsen914   I know one ex-914/6 racer who ran a J 1st gear at ...   Aug 30 2010, 09:24 AM
grantsfo   * Applicable Category Track: Laguna Seca * Engine ...   Jan 14 2008, 03:31 PM
911quest   * Applicable Category Track: Daytona rennsport III...   Jan 18 2008, 09:43 AM
stownsen914   * Applicable Category Track: Watkins Glen, Lime Ro...   Jan 18 2008, 07:40 PM
HAM Inc   Scott how did you get a GA first? Also are you usi...   Jan 19 2008, 09:03 AM
stownsen914   Scott how did you get a GA first? Also are you us...   Jan 19 2008, 02:39 PM
orange914   :confused: where is the transaxle code located? m...   Jan 19 2008, 04:18 PM
race914   :confused: where is the transaxle code located? ...   Jan 19 2008, 04:59 PM
HAM Inc   Scott thanks for the info. That's a pretty coo...   Jan 21 2008, 08:35 AM
GTPatrick   Race 914 , I tried several times to download your...   Jan 21 2008, 02:01 PM
race914   Race 914 , I tried several times to download you...   Jan 21 2008, 05:22 PM
Gint   The article is MS Word 97 and includes the workboo...   Jan 26 2008, 12:44 PM
Phoenix 914-6GT   So I tore open three boxes and found two with the ...   Jan 28 2008, 03:37 AM
tac27   Can anyone explain what the 'gear codes' m...   Mar 8 2008, 03:17 AM
race914   Can anyone explain what the 'gear codes' ...   Mar 8 2008, 09:20 AM
tac27   Thanks for the information, Greg, I'll work th...   Mar 8 2008, 12:16 PM
race914   With Santa's help, I just finished gathering t...   Dec 25 2008, 12:34 PM
J P Stein   Here's my plan for autocross: F, K.   Dec 25 2008, 01:07 PM
jrthomasec   How can I get my top speed up. I dont race but wou...   Jan 23 2009, 03:23 PM
race914   How can I get my top speed up. I dont race but wo...   Jan 23 2009, 03:52 PM
Randal   Went to the "914 901 Gear Ratio Workbook...   Aug 1 2010, 03:28 PM
race914   Went to the "914 901 Gear Ratio Workbook...   Aug 1 2010, 04:07 PM
naro914   I basically did what's in the link above ...   Aug 1 2010, 07:40 PM
tomburdge   I basically did what's in the link above ...   Aug 11 2010, 02:18 PM
naro914   Doesn't get much taller then a ZD, does it? ...   Aug 11 2010, 03:39 PM
J P Stein   Specs of the shitbox.....er...Britbox: Wt approx 1...   Aug 1 2010, 09:32 PM
BKLA   * Applicable Category Track: Portland (w/festival ...   Aug 11 2010, 03:32 PM
brant   I am blown away with how versatile my ratio's ...   Aug 17 2010, 03:52 PM
bam914   I am blown away with how versatile my ratio's...   Aug 18 2010, 08:48 PM
brant   no reverse... The F gear is too physically wide. ...   Aug 18 2010, 11:47 PM
bam914   Must have reverse in SCCA.   Aug 19 2010, 03:34 PM
vintage914racer   Any proven setups for Road America?   Oct 15 2010, 01:10 PM
Dr Evil   :popcorn:   Oct 15 2010, 08:30 PM
shoguneagle   Just had Doc rebuild my transmission for the follo...   Feb 8 2012, 05:59 AM
gil914   Use: Rally Engine 2.2S Max RPM: 7300 Wheel size: 1...   Feb 11 2012, 12:43 PM
J P Stein   Here's a chart I've used for years. The lo...   Feb 14 2012, 09:10 AM
Randal   Here's a chart I've used for years. The l...   Feb 15 2012, 09:42 PM
J P Stein   Hey JP, you coming down to Medford to co-drive w...   Feb 15 2012, 10:48 PM
Randal   Hey JP, you coming down to Medford to co-drive ...   Feb 16 2012, 10:11 PM
J P Stein   I have some "special needs" and would ra...   Feb 17 2012, 12:14 PM
Randal   I have some "special needs" and would r...   Feb 22 2012, 09:42 PM


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