R32 GTR - RB26 Dyno - Made 484 HP at the wheels.

[kevboost7]

Just wanted to share the recent dyno results on my car. 20lbs of boost on pump gas. Pulled the fuse on the AWD so it was only rear wheels on the dyno. It made 484 hp at the wheels. I asked the tuner to see if we could do something so it breaks the 500hp level, but he said that we were maxxed out on pump gas. If i wanted to make more power, id have to go to E85. 

 

 

[GTSBoy]

Nice. 600ish HP is probably a nice place to be.

[kevboost7]

i'm not at 600 though 😢 its 484hp (356kw) at the wheels.. 

[Dose Pipe Sutututu]

Still fast enough to have fun (kinda).

Time for a modern turbo with a divided turbine housing and a proper twin scroll manifold.

I think 400-450kW is a great place to be, provided it's all in before 4500 rpm.

[GTSBoy]

1 hour ago, kevboost7 said:

i'm not at 600 though 😢 its 484hp (356kw) at the wheels.. 

Yeah, whenever I say "HP", I mean HP. As in, at the engine. Allowing for a 25% discount from engine to typical Ozzie braked roller dyno figures, then subtracting the usual (more optimistic) US inertia dyno offset..... you get into the 600 actual engine HP territory from your 484 wheel number.

484 / 0.75 = 645   (that's Aussie rw intertia HP, converting to approximate engine HP.

645 --> 600 is discount for inertia dyno. Could actually be worse than that. But that would still be up around 600. So near enough for purposes.

[Kinkstaah]

What turbos are on it? 356 American KW is possibly the best place to be if you want to use the car. Close the internet and hit up a twisty road and ignore all other opinions and see whether you have fun driving the car around.

[hypergear]

Car would be very knock limited on pump 98 fuel, this is also why lots of old school turbos has such a massive turbine end to drive a small compressor.  Overall a decent result for pump fuel, 

[kevboost7]

10 hours ago, GTSBoy said:

Yeah, whenever I say "HP", I mean HP. As in, at the engine. Allowing for a 25% discount from engine to typical Ozzie braked roller dyno figures, then subtracting the usual (more optimistic) US inertia dyno offset..... you get into the 600 actual engine HP territory from your 484 wheel number.

484 / 0.75 = 645   (that's Aussie rw intertia HP, converting to approximate engine HP.

645 --> 600 is discount for inertia dyno. Could actually be worse than that. But that would still be up around 600. So near enough for purposes.

Nice, i like the sound of 600. 

[kevboost7]

8 hours ago, Kinkstaah said:

What turbos are on it? 356 American KW is possibly the best place to be if you want to use the car. Close the internet and hit up a twisty road and ignore all other opinions and see whether you have fun driving the car around.

I have GT2860R. I'm not sure if they are -5 or -7. Do you know? These are the exact ones. 

https://www.enjukuracing.com/products/garrett-rb26dett-gruppe-n-turbo-upgrade.html?srsltid=AfmBOopSCzHaDtf7nggL6R8KrD8RJP4wxBJitmkRmswmv2SaEbAVcxTe

And to be honest, i think the car was the most enjoyable to drive on the streets when it was 280hp (205kw). I could enjoy all the revs to redline i wouldn't be going crazy fast, but just fast enough to know that you are working the car.

 

[Kinkstaah]

Those would be the infamous -5 Turbos.

They're okay, 20psi on them on 93/98 is right on par with what everyone else can sort of flow for those, irrespective of what the output on the dyno shows. There's probably plenty of results in the RB26 thread with -5's and various levels of mods on petrol/gas to sort of compare it to.

They aren't as popular a choice now, and kinda weren't then as they're large, oldschool things, and twins never got the same kind of RND development that singles got which is what Dose is alluding to by telling you to put something modern on.

Just call it period correct and enjoy the rest of the car not blowing itself to pieces (which can, and will happen once you really get obsessed with power numbers).