MC-Epress Stage II I need help!!

[blazen582]

I just purchused a busa with a MC-express turbo kit on it stage II.
It also has the two stage boost. I am new to this so correct me if a I wrong.. It is at 14psi now. I have a button that I push to make it 21psi. My question is should I run 21psi on stock motor? If not what should be changed?

[FreaK]

No, you need HD valve springs, pistons , rods, studs...... ect. But hey try it if you want!:cheers:

[MR..X]

I just purchused a busa with a MC-express turbo kit on it stage II.
It also has the two stage boost. I am new to this so correct me if a I wrong.. It is at 14psi now. I have a button that I push to make it 21psi. My question is should I run 21psi on stock motor? If not what should be changed?

WOW , Yes a STOCK MOTOR will not last !!:oh yeah:
STAGE 2
21 PSI

[darryloake]

ya sorry to say stock motor wont stand up to 21psi. your compression is too low and most likely your engine physical strength isnt great enough to handle that much boost. cylinder head will lift off the block. the high compression will cause big time detonation and ur connecting rods will most likely bend. wouldnt be surprised if your fuel system has trouble keeping up with 21psi aswell. even on 14psi your pushing it with stock compression. forged rods and pistons. head studs. are the key components.stick around 9.0:1 comrpession piston and when the head and deck get plained u should be aorund 9.3 or 9.5:1 compression which is good for boost.

good luck