R32 GTR turbo decisions with build list

[jrog]

So I have a short list made out for things to upgrade on my R32 GTR. This list as of now is as follows:

Power FC

Deatschwerks low impedance 1000cc injectors

Walbro fuel pump

Nismo twin plate clutch

2860- 7 OR 5?!

Car already has an exhaust and intake system (HKS).

My question is to go with the -5 or -7?! I have read soooo many forums and ppl saying different things so I’m feeling it comes down to preference. I would like to make 450-500 hp at the wheels. I understand that the 7 more or less spools like my ceramics do now but will have more top end, where as the 5 comes in higher in the rpm range but have a ton of top end and can make serious power. I just want to make sure that what I do be safe and reliable at the same time if I go with either route. Any recommendations are appreciated.

Thanks!

Edited June 22, 2019 by jrog

[Torque Curve]

The power you will get from the -7’s is fun and reliable where as if you go to the -5’s you will get more power but the clutch will take more of a beating and the head gasket will have a limited life (if that’s still stock)

perconally would be looking at an ECU with some safety features though as the old Power FC is a bit dated now. Haltech and Link are dependable brands. 

[KiwiRS4T]

Read the RB26 upgrade thread for ideas (and start at the end for some more modern set ups).

And yes you can do better than a PFC this century. And check that your HKS exhaust does not shrink down to 2 1/2 in at the muffler.

[joshuaho96]

On 6/21/2019 at 10:07 PM, jrog said:

So I have a short list made out for things to upgrade on my R32 GTR. This list as of now is as follows:

Power FC

Deatschwerks low impedance 1000cc injectors

Walbro fuel pump

Nismo twin plate clutch

2860- 7 OR 5?!

Car already has an exhaust and intake system (HKS).

My question is to go with the -5 or -7?! I have read soooo many forums and ppl saying different things so I’m feeling it comes down to preference. I would like to make 450-500 hp at the wheels. I understand that the 7 more or less spools like my ceramics do now but will have more top end, where as the 5 comes in higher in the rpm range but have a ton of top end and can make serious power. I just want to make sure that what I do be safe and reliable at the same time if I go with either route. Any recommendations are appreciated.

Thanks!

PowerFC is old and doesn't even have knock control. If you don't notice the blinking light while doing a hard pull it will let you destroy the engine. Even the stock ECU has knock control. If you want something that works with all the factory bits and is properly modern I think the best from what I've seen is the Haltech Elite 2000/2500.

Bosch 040 980cc injectors with adapters. NZEFI sells them with the resistor pack eliminator. These are proper Bosch injectors, most aftermarket injectors are not very good, don't faff about and go straight to what the OEMs would use.

If you are ok with ~450 whp max then I would go with the -9s, it is achievable with 98 RON/93 AKI gas. Especially if you are building a street car. -9s do not give much in power up at all in the critical 3000 rpm region to -7s, I've seen the dyno charts and it's maybe 5-10 whp. If you want to fix that region you need more displacement and/or VCAM. HKS has an intake side VVT kit, PRP is working on a dual VCAM kit that will really eke out every last bit of response possible from the RB26.

For fuel pump selection you need to decide if you want to run E85 or not now. If you want E85:

Stock fuel pump wiring only supports 15A max. If you want to run E85 with that much power you need a brushless fuel pump. A brushless fuel pump will be able to sustain much higher flow rates even at high pressures and means that the pump will not wear out faster in the presence of E85. Any brushed pump will wear out faster with E85 vs gasoline, this is a fact of life. Deatschwerks and Fuelab are making brushless pumps that will be available before end of year that will be able to sustain 500 whp within the stock 15A limit. Ti Automotive/Walbro is making a 500 lph brushless pump that will draw 25A like the 450 lph brushed pump but at massively higher flow rates, especially in forced induction applications.

For pump gas:

Nismo/Tomei 276 lph fuel pump and be done with it.

Also, ditch the pods if  you still have them. They don't filter as well as the stock airbox and will definitely increase silica content in your oil.