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

[shoguneagle]

Just had Doc rebuild my transmission for the following:

Use: Street
Engine 3.2 (1987) Sixer
Hold max RPM to 6000
Wheel size: 17 inch Cup II rims, diameter - approx 25.3 inches
Weight: Estimated 2,200 to 2,300 lbs.
Gearing: 1st - A; 2nd - F; 3rd - O; 4th - X; 5th - Flipped H

Goal: To have good gear ratios in each gear for peppy response and shift points; fifth gear to run somewhere below 2800rpm for extended highway cruising - have large front cooler to compensate for any increase in the oil temperature from running at lower rpm levels. Oil capacity is approximately 20 plus quarts and has been running 180 degrees at 7000ft without thermostat bypass opening; at temperature and lower altitude targeted to run in the range of 200 to 215 (temperature in target plan is at 100degrees and more; desert type environment).