My stock z6 head sees 8,000 rpm everyday. Maybe I shouldnt beat on it that hard? W/E I have a few spares and it still makes all kinds of power so why not?

 

Actually that's not entirely correct. Everyone likes to assume that overlap is bad on a turbo car, even though a lot of results tend to say otherwise in some cases. If you're running a log style, more than likely you will benefit from some overlap as it helps promote a scavenging effect that's typically not present in log setups. Ram horn and equal length styles won't really see any benefit because of the way the exhaust pulses and scavenges. What little loss in boost pressure you see with an extra few degrees of overlap can usually be made up by turning the pressure up to compensate, and 9 times out of 10 you will gain some power out of it.

 

sweet i reved my y7/z6 mini me to 8200 all day for 3 mounts until i melted a piston cuz i had a ricer egay chip and it was lean.. but no reason to rev if you have a nice small fast spooling turbo i had a gay egay t3t4 so i was keeping it spooling so wehn i shif i have more boost..



piston owned bye lean burn i was racing on the freeway pulled to 132mph and died only 6psi lean = BAD



update
springs as i know i took a few heads apart and pulled out spring
the hx y5 head springs look about the same as z6 ones im guessing y8 are same too but y7 ones look a a little different never pulled them out the y7 to closley compare

 

Thats what you get for buying a egay chip :P. You should always have your setup tuned!

 

my stock zc sees 7600 a zillion times a day. after driving in my b16 del sol, i end up pegging the hell outa my sohc zc every gear lol. so used to taking my other car to 9400, kinda hard to remember to shift so much earlier.

 

thats why i got my ---- together and tune it my self :P :P :P :P