1996 R33 GT-R V-Spec - Built by Prostock Motorsports Japan

[BakemonoRicer]

Chasing up a dyno sheet so we can do a little more analysis.

reality is I need stronger wastegates, but the car is just a response monster and it pulls like a freight train, I really don’t need the extra power just yet...especially when a C63 AMG couldn’t hold a candle to this don mega build....

[BK]

What turbos is on this car again, Nismo R1 as earlier mentioned ? That's -7 or R34 N1 from all accounts right ?

[BakemonoRicer]

Ben, yes Nismo R1 turbos on the car.

Everyone says they're akin to -7's but that makes no sense, I'm making 30kw more than what people estimated.

[Mick_o]

1 hour ago, BakemonoRicer said:

Ben, yes Nismo R1 turbos on the car.

Everyone says they're akin to -7's but that makes no sense, I'm making 30kw more than what people estimated.

They certainly didn't let the Nissan out in this build Benny, because they built it with mostly stock engine components. ProSTOCK build. Even stock ECU ?‍♂️

[BakemonoRicer]

Well they put the fruit in the head. But I wish the bottom end was more fruity...

I'm suprised the owner didn't pay the little bit extra to run a set of forged rods......

Scott did laugh at the tune. The japs just love to throw a lot of fuel into it and be done with it.

 

[No Crust Racing]

That's about normal boost response for those size of turbos I thought? Especially when you have a half decent head. Remember manifold pressure does not equal lb/min of flow, it just means the turbos have pressurised the intake to that level. What's more important is rear wheel torque at 3900pm or wherever you're wanting to measure from. 

My head was stock, but I had cams and gears and  it made about 20psi at 38-3900 rpm on it's way to 24-25psi, which it almost held to redline. As per my opther comments, the turbos were at their limit and being outflowed, just like yours (mine were newer spec -9s with the better centre cartridge). 

Traffic light grand prix is fun, just don't blow 3rd

[BakemonoRicer]

Dyno graph attached 

[Steve85]

Dyno graph attached 

That torque curve... [emoji106][emoji7]

[BakemonoRicer]

yes its a torque monster, it comes on f**king hard mate

[BakemonoRicer]

785nm of torque mate.

[admS15]

785nm of torque mate.

Don't want to take anything away from the result but it aint 785nm. Dyno was not set to derived torque which is the accurate at wheel reading on mainlines. Its more like 550-570nm which is still pretty stout.

[BK]

On 14/07/2019 at 6:17 PM, BakemonoRicer said:

Ben, yes Nismo R1 turbos on the car.

Everyone says they're akin to -7's but that makes no sense, I'm making 30kw more than what people estimated.

You absolutely sure they are Nismo R1 then ? Output of over 350kw at only 20psi on 98ron seems very high does it not ? Also can you tell me how is R1 different than -7 turbos ? The specs supplied look identical to me. If I am missing something enlighten me as I am curious. Also your derived torque is on the bottom graph of your dyno sheet which is clearly under 600Nm as mentioned.

Nismo R1 Turbo: (Specs from RHD Japan)

Compressor Housing: T3 (A/R 0.42)
Compressor Wheel: T3 (Trim 55)
Bearing: Ball Bearing
Turbine Housing: T25 (A/R 0.64)
Turbine Wheel: GT25 (Trim 62)

Max. efficiency: 73%
Max. air pressure ratio (at boost pressure): 103% (1.35kg/cm2)


Garrett 707160-7 Turbo: (specs from Garrett)

Compressor Housing: T3 (A/R 0.42)
Compressor Wheel: T3 (Trim 55) - Ind: 44.5mm - Exd: 60.0mm
Bearing: Ball Bearing
Turbine Housing: T25 (A/R 0.64)
Turbine Wheel: GT25 (Trim 62) - Wheel Dia: 53.8mm

[No Crust Racing]

As abov Benny, Derived Torque is different. 

Here's an earlier graph before we finished tuning the car (it only ended up going to 380) and as you can see, and knowing the setup, there's no way it was making a genuine 1000Nm lol 

It was "zippy" but I wouldn't have called it a torque monster, it was only a 2.6 in the end. 

[Mick_o]

Nice result Benny! This really does prove the capability of the GTR!

360kw from stock snails on a stock motor is testament to this ?

[The Bogan]

Looks fun.

Just need to run a 1/4 now to prove the results.

I'll bring the donuts

 

Mmmmmm, donuts

[Ben C34]

12 hours ago, admS15 said:

13 hours ago, BakemonoRicer said:

785nm of torque mate.

Don't want to take anything away from the result but it aint 785nm. Dyno was not set to derived torque which is the accurate at wheel reading on mainlines. Its more like 550-570nm which is still pretty stout.

am i missing something, it says derived torque on the dyno sheet?

[admS15]

am i missing something, it says derived torque on the dyno sheet?

Yeah the 785nm part

[BK]

yeah that's right it does show derived torque, just not at 785nm . Dunno where 785nm come from as the derived torque graph clearly shows increments of 50nm vertical blocks, and is labelled as such with 200 at 4th block, 400 at 8th block and has 11 blocks shown. So just under top of 11th block is about 540nm, similar to around what admS15 mentioned. I'm still intrigued at the 356.4kw at wheels on 20psi with 98. I have GT-SS turbos on my 33 which are almost the same turbo as -7 / R1 except with a larger compressor trim of 56 (vs R1 with 55 trim) and I can't get near that.

Usually it dynos at 310 - 330kw on 98ron at 22psi. Runs mid 11s at anywhere between 116 and 120mph.

[Piggaz]

BK, it’s on E85.

[BakemonoRicer]

Correct the power run was on E85 but it’s tuned for flex. But I highly doubt I’d ever taint my fuel tank with 98, damn that stuff is so shit compared to sugar cane lol