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  • 2 weeks later...

I woudnt expect the 6870 to take over in power till up near the 6466 is close

To tapped out

Which on 30psi is no where even close

Even a 6466 is only just to take over smaller frames on that boost..

Cheers

Darren

I agree with this.

Set a powergoal, identify maximum boost the engine can handle, and design around that. Given that we are still running relatively small displacement it needs to be done with boost or revs. I can't see running much more than 31 psi though! And if you are still on the map at redline carrying that boost then you need not increase size of compressor (turbine maybe).

Yeah but dynos are fickle creatures.

I made 496hp with a to4z on 23 psi and ran 142 mph when everyone was saying to4z's were dinosaurs.

With this motor I expect to only run 26-28 psi and hope for 150 mph with the 6870.

Later on when I build a big motor it will see 30+. What I liked about what the yanks were saying about this turbo is the fact I won't need nos to get an 1100hp turbo on the trans brake and potentially only marginally more lag than the to4z.

And at $2970. Bargain compared to a gtx42r.

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