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Opinions On Hks Gtrs On A Rb26

QYQ

By QYQ,
in Engines & Forced Induction

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QYQ

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Wanted to know if the HKS GTRS turbos work well on an RB26. They don't seem to be a commonly used twin setup. I was after some real world experience from people that have had them in use or been in a GTR with them attached. What are your thoughts?? How did or do they feel.

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Dose Pipe Sutututu
Dose Pipe Sutututu

Twins are gaids, only really works on a V6 or V8 or so when you have separate plenum a for the group of cylinders that are huffing into the turbo. Twin scroll is where it is at, less restriction bett

Piggaz
Piggaz

Going from 63's to 67's. Having RS's and (I admit) it wasn't the optimal setup, they were woeful. However, I haven't come across someone that went from RS's back to the "lesser" -5's or 2530's and wa

Piggaz
Piggaz

The 71.1 mm RS wheel is rated at 44 lb/min each.The 63 mm GTX wheel is rated at pretty much the same. Gtx wheel is lighter, still has to get out of that peanut, small ass end. Cold side too big, hot

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bigmikespec Veteran

bigmikespec

Posted
Posted

Wanted to know if the HKS GTRS turbos work well on an RB26. They don't seem to be a commonly used twin setup. I was after some real world experience from people that have had them in use or been in a GTR with them attached. What are your thoughts?? How did or do they feel.

They are not common due to a mixture of misinformation and people not using them as part of a complete package. They are a 'bolt on' turbo but personally to get them to perform properly requires more work. Guys like XKLABA have the right idea... didn't Paul Diemar push 500kW with these back in the day? That was on a 2.6 with a lot of head work.

zebra Grand Master

zebra

Posted
Posted

They are not common due to a mixture of misinformation and people not using them as part of a complete package. They are a 'bolt on' turbo but personally to get them to perform properly requires more work. Guys like XKLABA have the right idea... didn't Paul Diemar push 500kW with these back in the day? That was on a 2.6 with a lot of head work.

yes

but he also got spanked by a 2.6 -5 powered circuit car on the strip

s2d4 Rising Star

s2d4

Posted
Posted (edited)

Put them in the bin. They suck.

GAV-5VSRS_zps0b8fd679.jpg

Direct back to back between -5's and RS's on a well sorted 2.8.

Gav actually had a massive drag intercooler with the RS's, and changed for a smaller one with the -5s. Not sure how much difference that makes then he went E85 at around that time too.

The last I heard he is changing up again from his gtx's, the dude is mad.

Edited by s2d4
Piggaz Grand Master

Piggaz

Posted
Posted

Going from 63's to 67's.

Having RS's and (I admit) it wasn't the optimal setup, they were woeful. However, I haven't come across someone that went from RS's back to the "lesser" -5's or 2530's and wasn't happier with them, regardless of engine size!

They're mismatched.

Cubes hides the shitness of these things! You DO NOT WANT these on a 2.6. 2.8 they still suck, 3.0 just hides the shitness of them.

No need to consider Jurassic park turbos in today's age.

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GTRNUR Grand Master

GTRNUR

Posted
Posted

They sucked on a 3.15lt too.

Shuffled at 2000 RPM making a MAF sensor tune impossible. Despite the averaging the comparator inputs on the ECU working the data from both MAF sensors, getting a consistent 14.7:1 at light load cruise just could not be done. The load cell would move around the map when engine speed and vacuum was not actually changing.

I didn't have the surge issues that the smaller motors have, but the shuffling would happen all the way till the wastegates were open (and probably a little after that too). Full boost was at 4500.

If your trying to hide what your have under the bonnet, and don't mind having a 6000-9000 rpm power band and no low end drivability then they are great!

If your driving the engine under load from below wastegate regulated boost, they will be terrible in comparison to the -5's or anything else.

Paul Diemer's setup used SR20 GT-RS's 0.86 housings, and I believe he switched to the HKS balanced low mount manifolds too, which to a degree will have eliminated shuffle by balancing back pressure to the turbine, reducing the miss-match issue... at the expensive of even more lag. You can bet that Paul was reving the hell out of his 2.6.

Piggaz Grand Master

Piggaz

Posted
Posted

Gtx2863s have more air flow rate than the gtrs turbos

The 71.1 mm RS wheel is rated at 44 lb/min each.

The 63 mm GTX wheel is rated at pretty much the same.

Gtx wheel is lighter, still has to get out of that peanut, small ass end. Cold side too big, hot side too small.

Go back through the gtx thread and Simon Haughton who did this exact combo regretted it because of heat issues.

A shiney billet wheel on the cold side doesn't fix the nugget rear ass end.

Can get in, can't get out, why bring more air in. It's farken stupid.

Trying to empty a bath with the plug pulled...but have a fire hose filling it up!

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