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Hi-flowing vs new turbos?


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Having recently spoken with my mechanic and looking as to what the next power mod should be (predominately for track work), the suggestion was for hi-flowing the existing turbos on the car (R33 GTR). Just wondering what many of you learned forced induction-ists think about hi-flowing over changing turbos to ball bearing jobbies. Not so much looking for FULL rev range increases but certainly relatively low rev spooling and constant power delivery.

Thanks

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The highflow cost me $1850 but dont look at their webstite (GCG) cause apparently they dont high flow them to what they used to because they were having problems with surging....

About the difference I have NFI still waiting for it to be drivable, give me two weeks :cheers:

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Had my turbo "Hi'Flowed" with steel wheels etc in my R33 gts-t....at 18psi puts 224kW to the ground (with all the usual supporting mods, using standard injectors). Works well for the money, but full boost is at round 4500rpm....bit high for my likeing.....if I could go back I think id spend a bit extra an go for a good second hand Apexi AX53B70 kit and make the same power at less boost (round 15-16psi) which would come in earlier in the rev range. Only had the Hi-flow in for 3 months, still considering selling it an upgrading.

My 2 cents :cheers:

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abcent i was under the impression that a stock turbo that is hi flowed will boost earlier than most of the aftermarket turbos but wont hold it as good as the aftermarket turbos due to housing a/r sizes

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Thats what I thought too......but......thats not what I got. Have to run higher boost (which isnt good...more boost more stess on motor etc..) and turbo starts to spool (round 7psi) at about 3500rpm. Before upgrade, running my standard turbo at 1Bar (round 15psi) i had 176kW at the wheels, getting FULL boost at 3500rpm.

I'm not quite sure what goes with normal hi-flowing. I bought the turbo exchange for mine. The new one looked the same externally, but the insides were all machined out to house bigger steel wheels, even machined out the inlet. And of course...all the components were new.

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Yep, I went the highflow - rebuild process with GCG, happy with the results of that.

Makes 260rwkw's on 21psi, its at the limit of its power now..

Maybe looking for a Garrett 3071 or GT30/40 as my engine is being rebuilt with forged internals..

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Having recently spoken with my mechanic and looking as to what the next power mod should be (predominately for track work), the suggestion was for hi-flowing the existing turbos on the car (R33 GTR). Just wondering what many of you learned forced induction-ists think about hi-flowing over changing turbos to ball bearing jobbies. Not so much looking for FULL rev range increases but certainly relatively low rev spooling and constant power delivery.

Thanks

Well high-flowed turbos will definitely not lower your boost threshold... If anything, it'll be laggier than stock, but higher top end...

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Well high-flowed turbos will definitely not lower your boost threshold... If anything, it'll be laggier than stock, but higher top end...

Mines better with the highflow, full boost by 3500rpm, power all the way through the rev range, responsive off boost.. ect..j

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Mines better with the highflow, full boost by 3500rpm, power all the way through the rev range, responsive off boost.. ect..j

What other modifications did you do at the same time as the turbo upgrade?

Wait........ Are you crediting your high-flow for the "responsive off boost"??? hsugh.gif

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So based on what most people have said, what should I be looking at paying for hi-flowing the turbos - based on the fact that I really have NFI as to what removal - re-build - install is worth and roughly how long does it take to get done?

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