1) what point does the stock turbo lose effeciency?
2) What would be needed to raise the redline to 8k?

I am starting to do a lot of autoX and an extra 1000rpms would be nice to have instead of me shifting then downshifting. Would the stock turbo still be able to push 22psi (what i currently run on pump gas) effeciently at 8000rpms?

What would be needed? 272 cams, fuel pump, ARP head studs are all for sure, injectors? New intercooler? ARP rod bolts? Ported head?

Thanks guys

 

...Your OE turbo is going to run out of breath before your goal. However, running nothing but the Works P2 flash, I ran a tight course almost entirely in 1st gear. I believe the Works rev-limit is 7850. I must admit my *** was puckered a little keeping the revs that high for 40 sec's at a time on the OE valve train. Since then, I've installed the upgraded Revolver valve springs and retainers and am now looking forward at another go at that course. I think your choice of "...272 cams, fuel pump, ARP head studs..." is a solid investment. I keep saying the springs/retainers are a peace of mind safety investment regardless of what quality manufacturer you go with.

 

Zeus

I think you are going to run into heat problems at 22 psi if you are in the upper rpm ranges for very long with the stock turbo.

I ended up going with a bigger turbo and intercooler just to address those very issues. But I am at WOT for 40 minutes, not 40 seconds.

EB

 

I am also curious if u need bigger injectors if u get higher lift camshafts? The OEM injectors are over 500cc's, so would bigger injectors be necessary? Thanks for your time guys!

 

You won't need bigger injectors until you upgrade the turbo or start pushing past 25 psi on the stock turbo. Cams do not warrant injectors and neither does 8K.

 

1. 21-22 psi

2. To run 8K safely you would need springs and retainers.

The stock turbo will push some pretty hot air at 22 psi and 8K. It most likely won't hold 22 psi at 8K anyways. I would get a bigger intercooler if you don't already have one.

 

so a new intercooler would be all that's needed to run up to 8k aside from the cams, pump, head studs. Could Mark raise my rev limiter to 8250? Also, would a new exhaust manifold help some of the air flow to help get it up to 8k while still making power?

 

flash or ems to get rid of the rev limiter.

other wise you'll hit fuel cut, even with the injectors i believe.

your boost cuts off at 23.5 psi.

yeh, i did wish i had another 1000rpm for the auto x on the second gear.

6300 rpm is where the efficiency dies i think. or 6800, between those two,.

 

He already is TT tuned.

 

Your ECU rev limit can be raised to whatever you want, even removed....

You're missing the valve spring/retainers out of that list, unless you want your pistons and valves to get really friendly...

The stock turbo is moving out of it's efficiency range at the stock rev limit, it will be well on it's way out of there by 8250. Also, if you're still running a 9.8 hotside it could become a restriction at those RPM levels as well.

 

/\ ...what he said.

 

Oh yeah, don't forget about Rod bolts, the stock ones won't appreciate hitting a rev limiter at those piston speeds. And that's a job, since the rods need to be removed and the big ends remachined if you put in new rod bolts. In other words, its a lot of work to gain some rev potential, rev potential that you still won't be able to exploit since your turbo will be holding you back.