I am in the process of putting together a brand new, high revving (8000-8500 RPM) 12a with about 350-400 hp on tap. Here is my question:

I have 3 window race bearing in the back, hardened stationary gears, stock rotor bearings, NON race clearenced rotors, 17.5mm hardened oil pump, 85 psi oil pressure regulator, and factory 3mm apex seals.

I DO NOT want any half assed, "itll take 9k on the stock motor" ****, because that is exactly what causes premature failure. I need to know if this combination will allow for quite frequent 8000 rpms (i can set the rev limiter with haltech). If it does not take it, would I necessarily need a 110psi oil pressure regulator and deep groove rotor bearings? Mazdatrix recommended these, but I am not convinced I will need these, the S4 and S5 engines dont have these and they have a redline of 8k. The only thing I am aware the S4 and S5 engines have is extra rotor face and land clearence.

Thanks for any help!

 

anyone??

 

you need the hi=press regulators front and rear if you want to do the motor right.. the race oil pump helps too..
dont worry about clearencing the motor, or the deep groove bearings not nessisary

 

Modify your e-shaft for more oil flow.

 

Actually,only the S5 non-turbo engines have a factory 8K redline.All S4 are 7K.The FC's thinner 2MM apex seals help reduce friction and the S5 rotors are lighter,reducing load on the Eshaft.Even though the S5 turbo engines have the lighter rotors,the factory redline is 7K since turbo engines make more power in the midrange
Its commonly agreed that the stock apex seals are safe to 8500 before they start chattering.Probably safer to not run sustained RPMs above 8000, though.For high RPMs,the lighter 84-85 rotors are best for reducing Eshaft load.If you dont have the rotors clearanced,at least have them snap ringed to prevent the gear from walking off.
Balancing is also a good idea.

 

thanks for the help robert.

 

Get a third gen rear regulator (~$20)and shim your front regulator($0.05 in washers), then have the rotating assembly balanced with the money you saved from buying new regulators. Finally, decide how high you'll be revving after you build the motor and once you see where the power peaks. Chances are, the turbo won't require you to spin that high to make your best power.