Do you have any dyno results for it, especially a comparison with the T04Z? Any more info on how it compares with the T04Z would be awesome!The HKS TO4Z spools pretty well, it made a comfortable 700BHP on my R34.
Now running a Borg EFR9180. Bigger turbo, but spool up is defo quicker, and makes more torque at the same rpm.
I am however running an RB30 engine with a step 3 head, so the addtional capacity and flowed head will have some impact on the turbo's performance.
I'd suggest having a look at what the big power scoobies and Evos (time attack cars) are using, as those are smaller engines than the RB26, and need fast spool for this type of event?
RB30/26, EFR8374 IWG .92a/r twin scroll, 20psi full boost by 3400rpm, BP98 fuel. 470wkw (630whp) at the hubsAlso interested in EFR results for a RB30.
Am running a T51KaiBB also step 3 head and reading results people suggesting EFRs are way to go but can't find any dyno data to support.
How do you figure that? They put a twin scroll Borg Warner on a single scroll manifold which was intended for the Precision and yet the Borg only falls a bit short of the Precision in power and out spools the Precision? Imagine if it had a proper divided manifold.....
Graphs only show half the story of my EFR, the response of the turbo is awesome, it seems to produce boost from near on idle
No, not on this engine.I'm no expert so I'm only going on the test I see on the net, in your case have you tried a precision or garrett with your engine spec as it is now? I'm not biased in any way I don't think any one will go wrong with any of them weather it's a pte, gtx or efr but the gains and differences are marginal between all of them in my opinion and unless you try yourself you can never actually say for sure. That's then why a dyno graph is all you can go by.