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HyperGear SR20det turbocharger Innovation, Evaluation and Testing - Hardtuned.net - Page 3

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HyperGear SR20det turbocharger Innovation, Evaluation and Testing 

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#61 pur40m

  • Joined:16-February 05
  • Location:Australia NSW
  • Car:180sx

Posted 26 February 2014 - 08:28 PM

Sorry don't have a dyno chart on eflex fuel will get a comparison off all with 3 setups once I put on the .86 housing
Not too sure when peak torque hit but 20psi by 3700rpm slightly creeped to 4000rpm as he did 3 back to back runs due to heat soak
Solid powerband to limiter 7200rpm
Nismo 740cc injectors extra bar base fuel pressure

Edited by pur40m, 26 February 2014 - 08:30 PM.


#62 HyperGear

  • Joined:28-February 06
  • Location:Australia VIC
  • Car:180SX, S14, S15, R33, R33, 300ZX

Posted 16 March 2014 - 08:53 PM

Had some time working on a newer version of SS15 SR turbo this weekend. Knowing the .64 might be restrictive up top, how ever I still want to keep it for its response, so I've grind down a larger exhaust wheel to suit the T28 bearing housing. Below is still the SS1.5 now running a much larger rear.

Posted Image

I have also bored out the internal gate to 36mm and used an large 38mm internal wastegate.

Posted Image

Its currently installed, response wise feel similar to the original version. How ever in upper top range it no longer feels like hitting a brick wall. I'm hopping to maintain the maximum compressor efficiency with lot less boost, while improve mid top range torque. Dyno tuning coming week hopefully.

Edited by HyperGear, 16 March 2014 - 08:54 PM.


#63 AE86557

  • Joined:27-December 12
  • Location:Australia NSW
  • Car:S14

Posted 17 March 2014 - 07:51 AM

exciting! :thumb:

#64 pur40m

  • Joined:16-February 05
  • Location:Australia NSW
  • Car:180sx

Posted 19 March 2014 - 08:12 AM

Can't decide what to change on my ss1.5 the rear housing to .86 or Tao's new larger turbine wheel to relive the engine of some back pressure
See what results his new turbo design delivers

#65 Varvs

  • Joined:21-December 07
  • Location:Australia NSW
  • Car:97 180sx Type X

Posted 19 March 2014 - 10:11 AM

would one of these turbos with the .64 rear be suitable for around 15psi on an unopened motor?

#66 HyperGear

  • Joined:28-February 06
  • Location:Australia VIC
  • Car:180SX, S14, S15, R33, R33, 300ZX

Posted 19 March 2014 - 11:20 AM

Not sure where Trent went this days. Not yet contactable.
.64 rear is fine for up to about 250rwkws. I'm just trying new methods getting more power without adding lag this stage.

Edited by HyperGear, 19 March 2014 - 11:24 AM.


#67 Dose Pipe Sutututu

  • Joined:19-January 05
  • Location:Australia NSW
  • Car:Boat Sutututuutu

Posted 19 March 2014 - 01:08 PM

 Varvs, on 19 March 2014 - 10:11 AM, said:

would one of these turbos with the .64 rear be suitable for around 15psi on an unopened motor?

remember it's not boost that kills motors, it's cylinder pressure caused by exhaust back pressure (small housing) AND excessive timing (for the amount of back pressure generated from the exhaust housing)

You can happily feed 1.4bar into a SR20DET unopened :)

#68 Varvs

  • Joined:21-December 07
  • Location:Australia NSW
  • Car:97 180sx Type X

Posted 19 March 2014 - 01:54 PM

sooooo I shouldnt run 12 pound on my T25 then? is that what you're saying?

#69 Dose Pipe Sutututu

  • Joined:19-January 05
  • Location:Australia NSW
  • Car:Boat Sutututuutu

Posted 19 March 2014 - 03:28 PM

^ I'm not an expert in T25 turbos, however 2x S15s I've tuned recently both run 1.2 bar, however bleed down to 1bar.. on the dyno, after about 7 hard 11km/sec ramps the motor started to ping (as the turbo started to glow).

#70 HyperGear

  • Joined:28-February 06
  • Location:Australia VIC
  • Car:180SX, S14, S15, R33, R33, 300ZX

Posted 19 March 2014 - 03:32 PM

The stock turbine has a tinny rear wheel which will creep alot of back pressure and heat at high boost. They are also equip with a small 270 degree thrust bearing that doesn't handle turbine end pressure so well. So at high boost levels, through a period of time, it wears through the thrust and develop an shaft play.

#71 Varvs

  • Joined:21-December 07
  • Location:Australia NSW
  • Car:97 180sx Type X

Posted 19 March 2014 - 03:49 PM

Thanks. Winding down to 10 psi...

#72 HyperGear

  • Joined:28-February 06
  • Location:Australia VIC
  • Car:180SX, S14, S15, R33, R33, 300ZX

Posted 20 March 2014 - 01:29 PM

Posted Image

Some updates on the SS15 prototype. It behaved as expected. Managed to max out the compressor using way less boost. The engine is much happier and been able to take more timing up top. Down side is slightly laggier due to larger exhaust wheel.

The most it made was 280rwkws peeked 26psi. Which at 21psi it managed to reach 270rwkws which was what the original version at using 25psi of boost. Pretty happy out come. Dyno tuned at Chequrered tuning based on pump 98 fuel.

Purple and thick blue is from the new SS1.5 today.
Thin faded blue is from the original SS1.5
Posted Image

Posted Image

Edited by HyperGear, 20 March 2014 - 01:30 PM.


#73 Dose Pipe Sutututu

  • Joined:19-January 05
  • Location:Australia NSW
  • Car:Boat Sutututuutu

Posted 20 March 2014 - 01:58 PM

Stao, is that with VCT or no VCT?

#74 HyperGear

  • Joined:28-February 06
  • Location:Australia VIC
  • Car:180SX, S14, S15, R33, R33, 300ZX

Posted 20 March 2014 - 02:15 PM

No VCT

#75 Dose Pipe Sutututu

  • Joined:19-January 05
  • Location:Australia NSW
  • Car:Boat Sutututuutu

Posted 20 March 2014 - 02:30 PM

Wow, pretty good result.. would be amazing if you had VCT running.

#76 AE86557

  • Joined:27-December 12
  • Location:Australia NSW
  • Car:S14

Posted 20 March 2014 - 03:19 PM

dumb question but how would this turbo react with VCT then in theory?

#77 Dose Pipe Sutututu

  • Joined:19-January 05
  • Location:Australia NSW
  • Car:Boat Sutututuutu

Posted 20 March 2014 - 03:24 PM

 AE86557, on 20 March 2014 - 03:19 PM, said:

dumb question but how would this turbo react with VCT then in theory?

more response, in theory would be able to get it to come on song like 200~400 rpm earlier

#78 MoJizzy

  • Joined:30-July 09
  • Location:Australia WA
  • Car:Silvia S14A

Posted 20 March 2014 - 04:05 PM

That looks pretty impressive Stao. What would it take to convert my ss1pu to an ss1.5?

#79 HyperGear

  • Joined:28-February 06
  • Location:Australia VIC
  • Car:180SX, S14, S15, R33, R33, 300ZX

Posted 20 March 2014 - 04:38 PM

VCT would be making around 500RPMs of different in response. I have bought the gear. it will be installed after I get this profile set. Its currently a lot more sensitive to changes in the wheel configuration.

The SS1PU on this turbine would be getting over 300rwkws easy.

#80 MoJizzy

  • Joined:30-July 09
  • Location:Australia WA
  • Car:Silvia S14A

Posted 20 March 2014 - 05:07 PM

So whats the major difference between the two turbos?

#81 pur40m

  • Joined:16-February 05
  • Location:Australia NSW
  • Car:180sx

Posted 20 March 2014 - 05:32 PM

Not a bad result but still think the smaller turbine might be better suit to this compressor
As it made 10kw more but at 1psi more and more timing but 2-300rpm lag penalty compared to the smaller turbine
I'll be installing the .86 rear to my ss1.5 this weekend and tune maybe 2-3weeks see how it goes
Tao what psi actuator you use on that run as there is a fair amount if boost drop

#82 HyperGear

  • Joined:28-February 06
  • Location:Australia VIC
  • Car:180SX, S14, S15, R33, R33, 300ZX

Posted 20 March 2014 - 06:39 PM


Well its still the same compressor. All I did was changing the turbine.


Main goal was reaching more power on less boost. Using the new turbine I'm been able to get 270rwkws based on 21psi while older turbine would required 25psi.


The advantage is very useful when comes to stock engines that can't handel so much boost.


Its holding pretty flat till 20psi. And then started to drop, I believe this compressor wheel is too small supplying 20psi to the engine after certain rpms.


I'm developing an CBB turbo for it at moment. Looking to make some thing crazy. Posted Image

Edited by HyperGear, 20 March 2014 - 06:53 PM.


#83 HyperGear

  • Joined:28-February 06
  • Location:Australia VIC
  • Car:180SX, S14, S15, R33, R33, 300ZX

Posted 20 March 2014 - 07:32 PM

This might be some food for thought. I was looking at the specs of the BC S2 cams. and found a dyno comparison of it vs stock cams. its 40kws differences in certain areas down low tho. Not sure what the Pon cams are like vs stock cams.

Posted Image

#84 pur40m

  • Joined:16-February 05
  • Location:Australia NSW
  • Car:180sx

Posted 20 March 2014 - 07:48 PM

Not sure if you read it right but it's more like 20kw difference up top but sacrafice 20kw from start till about 4500rpm

#85 HyperGear

  • Joined:28-February 06
  • Location:Australia VIC
  • Car:180SX, S14, S15, R33, R33, 300ZX

Posted 21 March 2014 - 08:46 PM

 MoJizzy, on 20 March 2014 - 05:07 PM, said:

So whats the major difference between the two turbos?

Difference is in the turbine but same compressor. The idea was getting maximum compressor efficiency based on lower boost level. This have worked. And after I get the limitation of what the compressor and turbine is capable of flowing, I will be able to precisely match an turbine with the right compressor, generating the most power for the level of response given.

As for the moment the SS1 in .64 turbine would be perfect for 250rwkws mark.

#86 MoJizzy

  • Joined:30-July 09
  • Location:Australia WA
  • Car:Silvia S14A

Posted 22 March 2014 - 02:21 PM

 HyperGear, on 21 March 2014 - 08:46 PM, said:

 MoJizzy, on 20 March 2014 - 05:07 PM, said:

So whats the major difference between the two turbos?

Difference is in the turbine but same compressor. The idea was getting maximum compressor efficiency based on lower boost level. This have worked. And after I get the limitation of what the compressor and turbine is capable of flowing, I will be able to precisely match an turbine with the right compressor, generating the most power for the level of response given.

As for the moment the SS1 in .64 turbine would be perfect for 250rwkws mark.

So whats the max potential for the 1.5 on e85 and about 25psi no cams?

#87 rezzy_S13

  • Joined:09-March 11
  • Location:Australia NSW
  • Car:SIlvia s13

Posted 24 March 2014 - 08:25 AM

is the ss1 the atr28SS? (website doesn't share a lot of info) If so have you done any testing on this in .64 with standard non VTC SR20?

Edited by rezzy_S13, 24 March 2014 - 08:27 AM.


#88 HyperGear

  • Joined:28-February 06
  • Location:Australia VIC
  • Car:180SX, S14, S15, R33, R33, 300ZX

Posted 24 March 2014 - 12:21 PM

The SRs output depending on its cams by a lot. Its almost as important as the turbo it self. The Difference between the BC stage 2 cams and tomei Pon cams is 15KWs, While the Pon cams has roughly 200 RPMs of better response.

The SS1.5 on my BC cams maxed out at 270rwkws at 25psi. So technically that would be around the 290rwkws mark on E85.

Currently the SS1 was trailed in .86 turbine housing that maxed out at 255rwkws, While the .64 is capable of flowing 260rwkws comfortably using the same turbine end. So I believe the .64 turbine should be just perfect for this compressor. Assume identical setup it should be maxing out around 250rwkws while reaching 20psi by 3600rpms on a none VTC SR20det.

#89 HyperGear

  • Joined:28-February 06
  • Location:Australia VIC
  • Car:180SX, S14, S15, R33, R33, 300ZX

Posted 26 March 2014 - 11:26 AM


Posting a little update. This is the SS2 based ATR28 turbocharger with a even larger turbine. This particular one runs off ceramic roller bearings. Hopping to get 300rwkws+ with 20psi by 4000RPMs.


Posted Image


Posted Image


#90 MoJizzy

  • Joined:30-July 09
  • Location:Australia WA
  • Car:Silvia S14A

Posted 26 March 2014 - 09:09 PM

 HyperGear, on 26 March 2014 - 11:26 AM, said:


Posting a little update. This is the SS2 based ATR28 turbocharger with a even larger turbine. This particular one runs off ceramic roller bearings. Hopping to get 300rwkws+ with 20psi by 4000RPMs.

Posted Image

Posted Image

That looks sweet, 300rwkw on an SR. So this turbo would be comparable to a 3071 or a bit bigger?





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