I have a question about 2 or 3 piece e-shaft's. I know a company called RotorSports sells a 2 piece e-shaft. Heres the link http://www.rotorsportsracing.com/per...ru2pcshaft.htm I am not to sure about this e-shaft because I could not find any info on GURU Racing. I think that GURU Racing might just be some company out of china. I know Top Fuel Racing has a 3 piece e-shaft but I cant find there website if they have one. Im just curious about these e-shafts because I want to build a mad revving engine. I know a 2 or 3 piece e-shaft is lighter. Im not asking if the modification is a good idea or not, some might have different opinions depending on what you do with your rx7. I just want to know about quality and the origin of these companies( I know about Top Fuel Racing just need there website or somthing, I dont know anything about GURU racing).

 

topfuel.jp

I know GURU makes a good one, Top fuel's E-Shaft is regarded as one of the best by the guys in japan. Knightsports makes a 2 piece one too.

Top fuels one is a 3 piece and can handle over 800-900 hp, but it also costs over 3000 dollars.

What is your budget? How much power? Application?

 

Thing is I dont really have a budget, Im going to spend as much as it takes to build my engine. Im building my FD for road racing. I plan on going all out to make a rev monster. Im not really shooting for a goal horsepower. The motor will make what it makes, but 430whp is the least I want. Im allready making 338whp with simple stuff like electramotive ecu, exhaust, and v-mount. Im kind of aiming for the most bad *** parts I can buy( it may take some time but waiting can pay off, if not too long).

 

Then in that case, you may need a 2 piece, if that. For under 450 horsepower, i do not think anything that extreme is needed. For road racing, more torque is better. I would focus on response, cooling, and reliability, for 450 horsepower.

 

Im allready going to focus on those. Im just looking for rpm's that a regular e-shaft cant provide.

 

Here's a thread about trying to increase the RPM's:

https://www.rx7club.com/rotary-car-performance-77/12000rpm-crank-451889/

 

Spinning a forced-induction engine into stratospheric rpm ranges is useless. You quickly reach a point of diminishing returns as rpm increases into the five-digit range because the intake and exhaust flow characteristics are completely different than a NA engine (for one thing, there's this snail-shell-looking thing blocking both the intake and exhaust paths). All you really end up doing is wearing out engine parts faster.