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HyperGear SR20det turbocharger Innovation, Evaluation and Testing

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Yes had a adjustable reg and extra bar fuel pressure

But make sure your fuel pump is up to the task

Need a walbro 460lph atleast rewired

I was on eflex which is usually about e70 so on united e85 will be alil less headroom

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Ball bearing option is now available to all ATR28 series and TD06-SL205 series.

 

We can carry now carry out bush bearing to ball bearing conversions to all Garrett T25 / T28 based bush bearing turbochargers, as well as other TD06 and TD05 based turbochargers.

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how much extra to go ball bearing in an atr28ss1.5?

 

what would be the difference in the way the turbo behaves between bush and ball bearing in the atr28ss1.5?

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You will be looking at $450 to carry it out. There is a pretty noticeable difference in throttle response.

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You will be looking at $450 to carry it out. There is a pretty noticeable difference in throttle response.

 

Does the ball bearing conversion make it spool up much quicker?

For example will an ATR28SS2 ball bearing come on as quick an ATR28SS1.5 bush bearing?

From memory I think there's a 300rpm difference between the two reaching full boost (20psi) in a bush bearing setup.

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I am curious on the answer to this too as I was looking at the atr28ss1.5 for the response and the answer might make me change my mind

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You will be looking at $450 to carry it out. There is a pretty noticeable difference in throttle response.

 

Does the ball bearing conversion make it spool up much quicker?

For example will an ATR28SS2 ball bearing come on as quick an ATR28SS1.5 bush bearing?

From memory I think there's a 300rpm difference between the two reaching full boost (20psi) in a bush bearing setup.

 

Ball bearings are maybe 500rpm faster at the most.

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Thought I read somewhere that there wasn't a massive differences in the ATR28 series?

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Its not just full boost will come on sooner

Transient response will be much better with ball bearing

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It really comes down to the size of the wheels and housing. Ie, if I run an ATR28SS15 on BB I probably won't notice much differences, while SS2 will be quite noticeable.

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Transient response is life changing with ball bearing in general. At 4000 rpm, my HKS 2530 would hit boost quicker than a bush bearing T28. I thought when I downgraded the T28 would be on boost all the time, but the car was a dog in between bursts. I dont care when full boost is so much, you can drive around it, but losing transient response killed the car.

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Going to get my ss2 bb'd and also going external gate at the same time along with a touch up tune. Will be interesting to see the difference

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I'd like to see some dyno results of the ATR28SS2BB to get an idea of the response.

My ATR28SS15 comes on full boost (20psi) at 3.7krpm and I feel like much laggier than that wouldn't feel the best on the street.

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Video footage from Victoria Time Attack last week at Philip Island. Our team won first at 1.35.72

TopStage S14 SR20det running our ATR45SAT BB turbo made 399rwkws@ 28psi

 

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absolute beast love to see dyno sheet looks responive.

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Some results to update:

 

This is an S15 with Drop in cams on E85 fuel. Car made 420HP using our ATR28SS15 turbocharger from Mid 2014. This should be one of the earlier SS15 versions, the later model held more boost. But either way it managed to pull pretty much identical figures are mine converting to P98 result.

 

power.jpg

 

dynosshot.jpg

 

 

Also adding customers feed back in the past few years. Apart from big cooler, free flow exhaust induction pipe plus step two cams as we already know. It also appear the car that made close power figures as my own has an aftermarket exhaust manifold.

 

I believe Liam (the guy made 297rwkws out of the ATR28SS2 P98 fuel internally gated three years ago) did a stock manifold swap due to cracks, ended up losing 30kws. He's putting another low mount back on and we should be able to confirm the case for sure.

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297 rwkw on internal gate yes will be higher than that soon

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Do you have any recommendations on manifolds?

Is any tubular manifold ok or is shelling out for a tomei expreme worth it?

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I don't believe there is much benefit over the stock manifold if saying low mount

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My 265 was with a leaky waste gate.

Made good power on stock mani once gate was sorted but couldn't rev out got stuck at 285 at 7000

Made 307 on 26psi at 6200 but it chocked up from there so going back to tubular

These results all have a wastegate on the turbine housing

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Also my last results where on a 38degree dyno cell day made 298 on a 29 degree dyno cell last time

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Is there much difference in response between the stock and tubular manifold?

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Depends on the design of the manifold

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Some video footage from Last weeks Victoria Time attack at Philip Island GrandPix.

 

ATR45SAT Turbocharger Powered Top Stage S14 SR20det (400rwkws @28psi, E85 fuel). Taking first in Modified class. Driven by John Richardson

 

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not that this will be read as its impossible to find but i got my setup to go easy 307rwkw on pump fuel with a hypergear turbo at 24psi just used a good stainless mani and gate on turbine housing now time to go e85

 

not that this will be read as its impossible to find but i got my setup to go easy 307rwkw on pump fuel with a hypergear turbo at 24psi just used a good stainless mani and gate on turbine housing now time to go e85

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Any updates on this?

What are the options if we want to keep factory housings or at least bolt up to factory intake and exhaust (S14)?

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Hi Guys, sorry I've been missing in action on this page for a while. Best way to reach my latest updates will be on FB. 

The biggest would be an SS-2 chra assembly and that would be enough to push over 300rwkws on E85 fuel internal or externally gated on a very free flow engine setup. 

Also worth mention is we have been quite successful in our ceramic ball bearing turbo system developments and the result of them is miles ahead in terms of overall boost response, throttle response, drive ability and reliability in comparison to traditional 360 degrees journal bearing assemblies. Its not worth charging less to forfeit all those befits, as we move forward, we will no longer be building bush bearing turbos for SR20det engines, but will provide support for existing customers.

 

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