How much power could a fully built 930 trans handle?

[needcash]

?

How much power could it handle and what would one cost?

[rlh930]

Umm - maybe 845 bhp or so?



http://www.fast-autos.net/porsche/porsche935md.html

[beepbeep]

Wrong question. You should ask "how much torque and how much waste heat should a fully built 930 trans handle?". With other words, you could break it with 300hp turbodiesel but it would survive 1200hp high-reving race motor.

Surviveability can be divided in two main questions:
1. Torque rating, (before housing starts two to twist and gears start to mesh wrong way)
2. Heat rating (how much waste heat can be disipated by transmission oil before it starts to break-down and loose it's lubricating abilities).

With other words, there is no "power rating" for transmissions.

There is maybe approximate max power that can be transffered with typical torque range for turbocharged Porsche engine.

As far as I know, 930 tranny will handle up to 700-800Nm of torque without problems for short periods of time. If no aditional cooling is included, that number should probably be down-rated to something like 400-500Nm.

800hp engine produces 588kW of power. 9% transmission losses means that 53kW of heat (!!!!) are disipated by tranmission at full tilt. Your house-owen typically dissipates about 2-3kW of heat. If this heat isn't transfered to air failure will occur very soon.

To answer your first question simply: 930 tranny with additional oil-cooling whould handle about 1000hp if connected to high-revving engine and equipped with spool.

[needcash]

thank you for your explaination beepbeep
what are some good sites to look for these?

[emcon5]

Anecdotally, I think the answer is "More than the stock 930 axles/CV joints"

Do a search, I think this has come up in the past, probably by Juan Ruiz.

Tom