Originally Posted by dfddfd2 on Sep/05/04
Wow! I am amazed at the overwhelming response to this project and really appreciate your words of encouragement. I can't wait to see it finished either!
Trans: Using the stock 97 Prelude trans...seriously considering adding a Phantom Grip...any thoughts, suggestions?
Unique: I've had this idea in my head since I started autocrossing an 84 Civic S back in 1991, but it is not unique. There are a few similar projects that are completed or in various stages of development. For examples see:
Radiator: Using stock 94 GSR radiator in stock location. The GSR radiator is the exact same size (cooling capacity) as the stock H22A4 Prelude radiator. I'm also considering a louvered hood to keep the hot air from underneath the car.
the LSD is kind of a tricky question since the majority of our experience is with FWD.
now we're talking mid-engine... uhhhh. uhhhhh. huh.
I dont have an answer but heres what i came up with as things to keep in mind:
-The phantom grip is considered pretty good for what it is. However as a "differential hack" im not sure how much of its design was influenced by the FWD layout of the cars it goes into if any. Its definetly not the most elegant solution and you should keep in mind this things attached to the rear wheels of your car. Any funny diff behavior that might be acceptable up front might really ruin your day out back.
-How much will you actually need an LSD? Except for low speeds a stock prelude motor has never created much problems with torque steer/peg legging etc.
-Especially in a RWD chassis? Lotus runs no LSD in their elise stock. they dont have to and they have more power than that prelude engine, becasue of the fact it's a light car with a mid engine. Not only do you get RWD weight transfer but the motors over the wheels, so theres enoguh traction that an LSD is a moot point. Although an elise weighs next to nothing you may be in the same boat.
-People brought up the braille integra... that was a FR setup. Integras are light in the rear, with an engine in the back theres going to be ALOT less wheelspin.
-Is it more headaches than its worth? Despite their downfalls open differentials are predictable. Depending entirely on the quality of the unit, how its setup, and how it works with the car as a whole LSD's can be just as predictable, or a PITA. This mostly goes for spring loaded clutch packs, with which you often pay a price in driveability for increased traction. The point is, the fact that this is an MR car is going to amplify these effects, the MR setup obviously requires alot of care as it can handle beutifally or become a complete handful depending on these things.
-Also, will the fact that these diffs were designed for a FF chassis come into play? Not sure about that one.
So personally i'd say leave the diff open for now, and if it comes down to it you can experiment later.