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Discussion Starter #1
Hi.
The car is R33 GTR
What single turbo do you recommended for street use with best spool for 700hp engine? I think about Precision Turbo 6262 bb ar84 divided. Or maybe go GTX35R? Or some Borg? I care about possible fastest spool.
Best regards
 

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I'm sure your engine has loads done to it so you would best suit with a Borg Warner EFR, 8374 twin scroll, external waste gates. They're reasonably priced considering they're have serious jam and are reliable.

-Opinion
 

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Discussion Starter #3
Thanks for answer :)
And what you think about Turbonetics Hurricane 7268-4 BB Sylvia? Its the cheapest, EFR8374 and GTX35R cost over 2000$ I can get Turbonetics for 1200$ And Precision for 1600$
 

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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?

cheers

Tal
 

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I will switch single soon and my choice will be BW s362 fmw.
some poeple run it on rb26 hit full boost between 4200-4500 for 600whp
and all for less than 1000$
 

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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?
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!
 

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EFR

Also 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.

Regards
 

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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.....
 

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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.....

Twin scroll turbos have been proven to be more responsive even on a open scroll manifold competed to open scroll turbo on open scroll manifold. If you actually follow the link a read the full comparison it says when the precision dbb was tested it was a lot hotter and a lot more humid meaning the spool and peak power off the 6266 was effected. Let's face it the bw spooled 70rpm earlier then the 6266 is that really even worth considering? Not in my eyes, that test just shows the efr turbo range isn't as good as it's people have been lead to believe in my opinion
 

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In your opinion, sure... But in terms of my logic, having a twin scroll housing with a single scroll manifold is going to be hurting it's power and spool versus a twin scroll manifold. If it had a single scroll housing I suspect it would perform equal or better on both fronts. It is disappointing that the comparison there is shown and taken as worth something as really it is all speculation and the only way it would be fair is if it was a twin scroll Precision turbo on a twin scroll manifold, or a single scroll EFR.
 

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Yes I no what your saying but any twin scroll turbo performs better no matter if it's a open scroll manifold or not. It would have been a better comparison if the efr was single scroll but then I would imagine the precision would have performed even better.
 

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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
 

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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

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.
 

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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.
No, not on this engine.
What I can say though is comparing my graph to my old graph with the -5s is night and day to response, the -5s have a typical boost response, where as the EFR does not
 

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If you're able to log then you could test how long it takes for the boost to come.
Say you start the log and your at 6k rpm with 0% throttle. Then floor it and see how many milliseconds it takes to reach full boost.

There you compare responsiveness.
 

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very useful discussion as I am trying to figure out which single turbo to go with also - for a good response and more power
 
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