Hypergear Turbochargers and High flow Services Development thread

[Dale FZ1]

^^ That graph looks to fall over very quickly after 5500 - top end choking.

What is SAT?

[hypergear]

The 53mm GTRS turbines don't work with RB25det engines very well.

The SAT stands for Special application turbocharger. This one is made only for Rb26 and Rb25 turbo engines working with large external gate setups.

[XKLABA]

We can high flow them to -5 or -9 depending on the HP chasing for.

With the damaged -7s I need to have a look at the turbo, the smallest billet wheel that I currently make is in 60mm that made 250rwkws on P98 on my SR20det.

The -9 idea sounds the go, what's involved in that and can it utilise the billet wheels

Also an idea on pricing, PM if needed

I have also posted in the Kando thread about fitting the 20.5g TD06SL2 onto a RB26 manifolds in twin form

[colourclassic]

Car is going in for tune next week with the 21U highflow and I can't decide which injectors to use.

I have a set of S15 440cc injectors (cleaned and flow tested) or potentially a set of used Nismo 740's.

If the 440's are enough for around 260rwkw (keeping conservative AFR's and safe injector duty cycle) I'll use them. If not I have to shell out for the 740's.

Car will be running PULP.

[RBrennan25]

Car is going in for tune next week with the 21U highflow and I can't decide which injectors to use.

I have a set of S15 440cc injectors (cleaned and flow tested) or potentially a set of used Nismo 740's.

If the 440's are enough for around 260rwkw (keeping conservative AFR's and safe injector duty cycle) I'll use them. If not I have to shell out for the 740's.

Car will be running PULP.

Why not just grab a set of ID's/xspurts? They're pretty cheap and have a 725cc injector and have E85 capability should it become available near you. Not sure what a used set of 740's goes for but I'm sure the xspurts would only be maybe 100 or so more

[GTSBoy]

The 440s will be at or above max to make ~260rwkW. Will do it, but will not have any of that safety factor you were after.

[colourclassic]

Why not just grab a set of ID's/xspurts? They're pretty cheap and have a 725cc injector and have E85 capability should it become available near you. Not sure what a used set of 740's goes for but I'm sure the xspurts would only be maybe 100 or so more

I want to keep the factory side-feed rail for now.

The 440s will be at or above max to make ~260rwkW. Will do it, but will not have any of that safety factor you were after.

I guess that answers my question!

[RBrennan25]

I want to keep the factory side-feed rail for now.

Ah yes fair enough. Definitely go the 740's then keep it safe

[XKLABA]

I make 290rwkw with the factory GTR 440s, 260rwkw should be a cake walk

[colourclassic]

I make 290rwkw with the factory GTR 440s, 260rwkw should be a cake walk

Any idea on duty cycle at that power level?

[GTSBoy]

And fuel pressure?

[Badgaz]

we made 271rwkw @ 1 bar @ 97% duty cycle on the factory injectors with stock fpr.

[colourclassic]

we made 271rwkw @ 1 bar @ 97% duty cycle on the factory injectors with stock fpr.

Stock GT-R injectors? Gts-t 370's would never get that far...

[Badgaz]

Thats the result from my wife's gtr

[Therealsandybang]

Hey,

Recently purchased the newer version of atr43ss2 (internally gated 17psi actuator)a few weeks ago. Vehicle has following mods :

Nistune

Dvs custom metal intake 3" with breather and returns

Factory air box with high flow panel

Z32

Braided oil lines

Jjr dump/front pipe 3"

Catco race car 3"

Turbosmart boost tee

Ngk-r BKR7E 0.8mm gap

Blitz return flo cooler

Nismo muffler

Nismo fuel pump

Id1000

Dvs jez tuned vehicle and was only able to safely make 230kw going from 18psi Down to 15psi.

Elimination tests:

Removed top of airbox and tune ( minimal gains)

Removed muffler and tune ( minimal change)

Checked boost leaks etc

Running shell 98

I'll get the dyno graph and other details when I pick up vehicle.

Dvs tuning advised may be the return flow cooler causing the issue.

Any advice. I'm stumped.

[Therealsandybang]

[hypergear]

Check pressure drop across the cooler. I see this happens with certain model of blitz coolers. Also pre-load the actuator abit more.

Green is before cooler and the rest is after.

[XKLABA]

Any idea on duty cycle at that power level?

That was about 95 DC at factory pressure, I have since upgraded pump and bumped base pressure up 5psi and car has since made 293rwkw with new rings and bigend bearings and HG on same boost level

95DC is not advisable, but I was trying to achieve something which I am 0.14seconds off

Edit : with the way I have my car set up it is very good on fuel and has got over 630km from a tank full

[Badgaz]

Hey,

Recently purchased the newer version of atr43ss2 (internally gated 17psi actuator)a few weeks ago. Vehicle has following mods :

Nistune

Dvs custom metal intake 3" with breather and returns

Factory air box with high flow panel

Z32

Braided oil lines

Jjr dump/front pipe 3"

Catco race car 3"

Turbosmart boost tee

Ngk-r BKR7E 0.8mm gap

Blitz return flo cooler

Nismo muffler

Nismo fuel pump

Id1000

Dvs jez tuned vehicle and was only able to safely make 230kw going from 18psi Down to 15psi.

Elimination tests:

Removed top of airbox and tune ( minimal gains)

Removed muffler and tune ( minimal change)

Checked boost leaks etc

Running shell 98

I'll get the dyno graph and other details when I pick up vehicle.

Dvs tuning advised may be the return flow cooler causing the issue.

Any advice. I'm stumped.

when you say 'safely' make .... was the engine knock limited?

[XKLABA]

Hey,

Recently purchased the newer version of atr43ss2 (internally gated 17psi actuator)a few weeks ago. Vehicle has following mods :

Nistune

Dvs custom metal intake 3" with breather and returns

Factory air box with high flow panel

Z32

Braided oil lines

Jjr dump/front pipe 3"

Catco race car 3"

Turbosmart boost tee

Ngk-r BKR7E 0.8mm gap

Blitz return flo cooler

Nismo muffler

Nismo fuel pump

Id1000

Dvs jez tuned vehicle and was only able to safely make 230kw going from 18psi Down to 15psi.

Elimination tests:

Removed top of airbox and tune ( minimal gains)

Removed muffler and tune ( minimal change)

Checked boost leaks etc

Running shell 98

I'll get the dyno graph and other details when I pick up vehicle.

Dvs tuning advised may be the return flow cooler causing the issue.

Any advice. I'm stumped.

3 things I see MIGHT cause you issues

1) JJR dump pipe ( this is a copy of the HKS item and that was never really much chop )

2) boost T will cause boost to tapper off

3) return flow cooler could be causing pressure drop, Stao has graphs of this from his GTR