Hi guys, in your opinion, how many hp will produce my stock 255hp car after thes following modifications?
Kn filters breathing fresh air, downpipe, free flow pipe replacing the cat, bigger and fresher intercooler, "biggers" injectors, and Apex'i or Pfs engine management, with turbos blowing more or less 10 psi.
Really I want to know if these mods worths the effort!
Excuse me for my english (I'm from Spain...), bye, and thank you in advance!

 

~300 rwhp (this is a conservative guess).

 

I would say ~260-280 rwhp. The injectors, the ecu, and the intercooler BARELY come into play @ 10 psi. In fact, you don't even need the injectors (and possibly the ecu) if you keep yourself @ 10 lbs of boost. All you have done is prepare yourself for more power IF you raise the boost. If you keep it at stock levels, you aren't actually gaining much.
Just my opinion....

 

thats true, didn't read the psi part, thought you would at least go to 12psi.

 

If you run 13 psi or so they'll be worth it. Definitely over 300 to the ground.

 

Thank you guys, if the engine doesn't explode I will push the boost to 13 psi! When you say "hp", do you intend at flyweel, or at rear wheels? I suppose that Mazda quote the 255 hp at flywheel, or I'm wrong?
Bye!

 

yeah, thats to the flywheel, I think stock dynos are around 213 rwhp.

 

Yup. 300 to the ground (rear wheel horsepower) is around 345 at the motor. Assume a 15% driveline loss for an FD. Your engine definitely will *not* explode at 13 psi, as long as you have sufficient fuel mods, engine management and tuning. It's the turbos you can't push much past 14-15 psi.

 

Thankyou all very much, your experience and tips are very usefull! Bye.