914 901 Gear Ratios, Tech Article, Gear Ratio Workbook, Member Gear Set Library Options

[race914]

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 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

[tac27]

Can anyone explain what the 'gear codes' mean? For example, the 'A', 'I', 'N' or 'X'. Are these codes universal, are just for the 901?

My Dad and I are rebuilding a '72 4 cyl. We've increased the displacement to 2L and switched to carbs. I'm not sure what hp or torque it produces.

thanks for posting the excel file

Tim
Las Vegas

[race914]

Can anyone explain what the 'gear codes' mean? For example, the 'A', 'I', 'N' or 'X'. Are these codes universal, are just for the 901?

My Dad and I are rebuilding a '72 4 cyl. We've increased the displacement to 2L and switched to carbs. I'm not sure what hp or torque it produces.

thanks for posting the excel file

Tim
Las Vegas

Hi Tim,

The codes you mention are specific to the 901 and are used to designate the ratio of each gear set. The Tech Article listed in the first post of this thread talks about the gear codes, and also contains an excel spreadsheet (click on the '914 901 Gear Ratio Workbook' link, then go to the third tab or worksheet: '901 Gear Ratios _ RPM_MPH Table') that includes all 901 codes and their ratios.

The Tech Article can be accessed by the main header: '914 Info' ; 'Tech Articles' ; 'Re-gear your 914'. or click here

Greg