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Opinions On Hks Gtrs On A Rb26

QYQ

By QYQ,
in Engines & Forced Induction

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XGTRX Veteran

XGTRX

Posted
Posted (edited)

It was.

Linear, quick to fall back into its stride. I would 100000% prefer that than a set of -5's (let alone a set is RS's) on a stock engine. Makes me very curious to see what a 3582R would do on the same setup, being smaller.

That was an old dinosaur garrett Z, open scroll, single gate setup.

The Zs work well don't they.

[emoji2] [emoji2] [emoji2]

Don't know what it is with the 35s but they don't seem to come back on as quick in between gear changes, where dyno sheets makes them look better than what they are in my experience.

Its good to see u experienced the Z first hand, dynos tend to lie about a lot of things, but its a fun turbo that's for sure.

Edited by XGTRX
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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

Posted Images

s2d4 Rising Star

s2d4

Posted
Posted (edited)

Yet to see a GTW result that is half decent.

I would assume twin scroll, billet compressor wheel and ball bearings would make some difference compared to the dirty T04z you tested?

The old T04z dynos never looked any good really. People actually use to look at that and stay with the twins.

Edited by s2d4
XGTRX Veteran

XGTRX

Posted
Posted

Yet to see a GTW result that is half decent.

Old Z with a newer style billet compressor with a bit of cleaning up comes on 300 or so earlier. Pretty much what a GTW does, yet people always claim more response, like 500 rpm, yet to see it though.
Dose Pipe Sutututu Grand Master

Dose Pipe Sutututu

Posted
Posted

Because most GTR owners run those T04z in single scroll.

To really harness any motor vs. turbo application is to go twin scroll to reduce back pressure on each pulse as well as rely on scavenging.

The more the motor breathes, the more torque and power it will make. Simple combustion engines 101.

Piggaz Grand Master

Piggaz

Posted
Posted

I would assume twin scroll, billet compressor wheel and ball bearings would make some difference compared to the dirty T04z you tested?

The old T04z dynos never looked any good really. People actually use to look at that and stay with the twins.

I got into this car expecting the worst. Got out of it with a smile on my face.

I'm not shy to express my hate for 2.6L's. They suck. But I'd rather a 2.6L open scroll, dirty old Dinosaur T04Z than a 2.8L with RS's as much as I hate to say it.

Call it what you will. I'm VERY critical of a setup.

XGTRX Veteran

XGTRX

Posted
Posted

I would assume twin scroll, billet compressor wheel and ball bearings would make some difference compared to the dirty T04z you tested?

The old T04z dynos never looked any good really. People actually use to look at that and stay with the twins.

Garrett Zs are ball bearing
s2d4 Rising Star

s2d4

Posted
Posted

I got into this car expecting the worst. Got out of it with a smile on my face.

I'm not shy to express my hate for 2.6L's. They suck. But I'd rather a 2.6L open scroll, dirty old Dinosaur T04Z than a 2.8L with RS's as much as I hate to say it.

Call it what you will. I'm VERY critical of a setup.

I wasn't having a go nor do I like RS's.

Was just saying that you would like the gtw more than the old z, dyno or no dyno considering you like the z and that generally has not so nice dyno curve.

XGTRX Veteran

XGTRX

Posted
Posted

I wasn't having a go nor do I like RS's.

Was just saying that you would like the gtw more than the old z, dyno or no dyno considering you like the z and that generally has not so nice dyno curve.

Well, the same can be said about the GT vs GTX. And the jury is still out on those as they take a shit load of boost to reap the benefits. Yet to see a gtw impress on an RB in the real world. As piggaz found out the old BB Zs aren't as bad as people make them out to be and their performance aren't really reflected on a 4th gear WOT run on a dyno sheet. As with so many perceived laggy dyno sheets, the real world says different.
  • Like 1
Piggaz Grand Master

Piggaz

Posted
Posted

If I could draw a comparison.

The low end fell between a -9 and a -5, yet made 450 kW. This was the most basic jurassic park setup there is. A proper twin scroll manifold, twin gates, two scroll ass end housing would have made it better no doubt!

"Twins for response" is a little upsetting when a dinosaur open scroll Z punches hell out of -5's on an equivalent engine.

s2d4 Rising Star

s2d4

Posted
Posted

Well, the same can be said about the GT vs GTX. And the jury is still out on those as they take a shit load of boost to reap the benefits. Yet to see a gtw impress on an RB in the real world. As piggaz found out the old BB Zs aren't as bad as people make them out to be and their performance aren't really reflected on a 4th gear WOT run on a dyno sheet. As with so many perceived laggy dyno sheets, the real world says different.

Yeah, I wasn't disagreeing with you guys.

No idea what started the shit storm.

s2d4 Rising Star

s2d4

Posted
Posted

If I could draw a comparison.

The low end fell between a -9 and a -5, yet made 450 kW. This was the most basic jurassic park setup there is. A proper twin scroll manifold, twin gates, two scroll ass end housing would have made it better no doubt!

"Twins for response" is a little upsetting when a dinosaur open scroll Z punches hell out of -5's on an equivalent engine.

Pretty sure that's what I was saying.
XGTRX Veteran

XGTRX

Posted
Posted (edited)

Fairly certain they didn't used to be and can still be ordered without the ball bearing, no idea how old of a Z we are talking about though.

They were BB from about 10+ years ago, old tech with BB cartridge.

Yeah, I wasn't disagreeing with you guys.

No idea what started the shit storm.

No shit storm, just a discussion, all good. Edited by XGTRX
  • Like 1
Count Grantleyish Grand Master

Count Grantleyish

Posted
Posted

They were BB from about 10+ years ago, old tech with BB cartridge.

No shit storm, just a discussion, all good.

Don't you have 04z setup in yours?

If so, is it modern 04 or? I'm curious now lol

reaper Experienced

reaper

Posted
Posted

As much as you say you don't we all know you love the little 2.6

I got into this car expecting the worst. Got out of it with a smile on my face.

I'm not shy to express my hate for 2.6L's. They suck. But I'd rather a 2.6L open scroll, dirty old Dinosaur T04Z than a 2.8L with RS's as much as I hate to say it.

Call it what you will. I'm VERY critical of a setup.

XGTRX Veteran

XGTRX

Posted
Posted (edited)

Don't you have 04z setup in yours?

If so, is it modern 04 or? I'm curious now lol

Dual Ball Bearing Garrett To4Z . 700-750HP flow potential.

Compressor wheel diameter is 84mm exd. / 66.7mm ind. (63trim) Compressor housing is .70 A/R has a 4" inlet and 2.5" outlet slip on connection.

T4 Turbine housing divided A/R .84 entry, all with standard 3" V-band discharge.

Turbine

-Wheel: 74.2mm w/ 76 trim

-T4 Divided Housing A/R .84

Compressor

-Wheel: 84.0mm exd./66.7mm ind w/ 63 trim

-Housing: 0.70 A/R

t04zcompress.gif

Edited by XGTRX

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