1jz-gte redline

[amichie]

Just looking at some of the dyno charts for jz-gte engines and noticed that power starts to drop off at about 6500rpm on many charts. Question is what is stopping the 1jz-gte from making even more power beyond this point? I would have thought they were capable of spinning well beyond 7000rpm without loss of torque.

Any thoughts?

[Draven]

cams

10 chars

[COS25T]

cams, valve springs and turbo sizing.

[amichie]

cams, valve springs and turbo sizing.

At what boost, rpm do valve springs become an issue??

[Smokey228]

I'd think it was chocking up with the little ct12s aswel..? I shift at 7300-7450 at the drags. Well atleast thats where my limiter is set anyway...

Cheers,
Jase

[xistant]

little stock ct12a's run out of puff, my GT30R sings happily at 7500rpm

[amichie]

little stock ct12a's run out of puff, my GT30R sings happily at 7500rpm

Is that with stock valve springs? And how much boost do you have at 7500rpm?

[xistant]

18psi currently yes stock springs and cams.