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

[race914]

With Santa's help, I just finished gathering the parts for my Laguna Seca gear setup: 904 mainshaft with A-H-Ka-Q-V. Here's the chart from the Gear Ratio Workbook link in this thread.




The issue I'm working is turn 11 which leads onto the main straight. The stock F 2nd was too low, and my Ka 3rd was a little too high. The turn before the longest straight is the most important turn related to lap times, and I was probably losing a couple car lengths there when I'd lose my momentum in traffic, so this was my highest priority off season improvement.

The H second will let me take that turn around 4K rpm. The video of the the original setup A-F-Ka-Q-V is here. Will post the results once I get the upgrades done and get back to Laguna.

Thank you Santa! (IMG:style_emoticons/default/santa_smiley.gif) (IMG:style_emoticons/default/bye1.gif)