From what I have gathered in this forum and from Seb at SpecialtyZ who has a TT370z, 500rwhp is comfortable with a GOOD tune but I have no direct experience with FI personally. The tune and supporting mods are the key ingredients, but this is purely on the basis that the car is street driven.

I feel 500 WHP and a good tune is the sweet spot for these motors. Like Nismo 370z said, the way torque builds up on these motors helps with it's longevity. IMHO 450 is more than enough for the street! Gotta be able to put all that power to the ground somehow.

450 would be my comfort limit.

100 million WHP!

http://t1.gstatic.com/images?q=tbn:A...Yi-SAlfNx8NYdQ

assuming the tune is spot on, it's going to be the torque that kills motors eventually, not hp.

Yes, the way the tq builds esp the turbo cars. You can only load the rods bearings so many time before you spin one. Also @ 11 to 1 and having cast pistons is kinda scary, knowing what the cylinder pressures are under boost eeek, good luck F.I. guys

I voted 450. I don't feel comfortable tracking my car as it is, much less with 500whp.

Y'all are making it sound like all 450+ HP FI cars are Doomed...

:iagree: This thread is making one think twice about going FI on our cars. I guess one might be better off using the TT cash towards GTR instead and still get the 500+ whp without blowing up any engine.

It all comes down to what you plan to do with the car though, so some of you scared need to understand if you are going to be bouncing off the redline on a track then be prepared for something to blow.
If you plan to drive the car around on the street and have some fun here and there then 500whp with a good tune and built properly & maintained can be achieved for awhile I bet.

This is looking More Tempting, The 12k to Turbo can go towards a GTR..

Exactemundo compadre and it's more like 15k-17k to do it right ;)
I voted 450whp for the Z based on tuner's experience.

Problem is, I still owe high 30's on my car...

Yes you can spend that money on a GTR but do you know how much is cost to maintain that car. Let alone th parts are ridiculously expensive 3k+ for a catback, no thank you I pass.

Ah the GT-R would be fun...I've read too many threads and articles of people paying $2000 for normal maintenance visits. Oil for it is over $100 per quart and it needs like 8 of them. Air filters are $50 each. Add in labor and stuff and next thing you know its on eBay..