Is There Something More Efficiente Than -5S / 2530 ?

[cobrAA]

I believe the GTX28 are actually 10% more efficient for the same spoolup as the -5s but with new company and model, is there something even better or easier to bolt-on than the gtx28 which you have to relocate Powersteering and make new downpipe ?

thanks

[scotty nm35]

An easier bolt on might be getting billet wheels put into the stock housings. Try giving Stao (Hypergear) a PM. I am sure he could help you out.

[GTRsean]

http://www.skylinesaustralia.com/forums/topic/384897-new-garrett-gtx2860r-2863r-2867r/?hl=%20gtx2860

Info here on GTX's on GTR RB26dett

[hypergear]

Depending on what the goal is. The standard turbochargers can be high flowed while still been stock boltons without any fabrications.

The factory rear housing is in .48, means the maximum the exhaust side can flow with a T28 exhaust wheel is about 310HP each.

Based on the capacity of the turbine side, we can high flow with our SS-1 64mm billet compressor wheels. So the maximum end result from high flowing would be about 570HP or 363rwkws as a twin.

Alternatively we can also high flow with a larger 75mm exhaust wheel and a 68mm SS1.5 billet compressor wheel which will instantly boost the power level to about 400HP each using factory .48 turbine housings, how ever running those as a twin would be considered pretty laggy for road driving.

[cobrAA]

Depending on what the goal is. The standard turbochargers can be high flowed while still been stock boltons without any fabrications.

The factory rear housing is in .48, means the maximum the exhaust side can flow with a T28 exhaust wheel is about 310HP each.

Based on the capacity of the turbine side, we can high flow with our SS-1 64mm billet compressor wheels. So the maximum end result from high flowing would be about 570HP or 363rwkws as a twin.

Alternatively we can also high flow with a larger 75mm exhaust wheel and a 68mm SS1.5 billet compressor wheel which will instantly boost the power level to about 400HP each using factory .48 turbine housings, how ever running those as a twin would be considered pretty laggy for road driving.

I don't understand, you say the max flow is 310hp or 620hp then you say your SS-1 wheels gives 670hp which is less than the previous number and what the -5 can do.

[hypergear]

Just stay on the conservative side I have applied deduction..

To calculate the total power level out put as a twin, the usual formula is 100% power capacity of the first turbocharger + 70% capacity of the 2nd turbocharger. So if the high flowed turbochargers are capable of 400hp each then as a twin they support 680HP, not 800HP. Which factory housing can support up to 350HP each, which works out to be 570HP as twin.

another thing to keep in mind is that we are still dealing with a stock .48 rear housing, while the -5 has .64 rear housing. That makes a huge difference. Means to match the flow the exhaust side has to be larger. The capacity from standard highflows would be very similar to what you would get out of two -5s.