GTR Powertrain Losses

[JayDee]

Hi Guys, I am new to the forum and have just bought an R32 GTR.

1) I know that rwkw is the important figure but I am interested to know what my power might be at the engine (just for a basic comparison to manufacturer specs).

R32 GTR DD Dynoed at 200kw at wheels (as far as I know standard with just a 3 inch nismo exhaust and running 10psi boost).

2) any ideas on expected quarter mile times and 0-100kmh times with 200kw at wheels R32 GTR.

thanks in advance

[marchGTR]

Hi Guys, I am new to the forum and have just bought an R32 GTR.

1) I know that rwkw is the important figure but I am interested to know what my power might be at the engine (just for a basic comparison to manufacturer specs).

R32 GTR DD Dynoed at 200kw at wheels (as far as I know standard with just a 3 inch nismo exhaust and running 10psi boost).

2) any ideas on expected quarter mile times and 0-100kmh times with 200kw at wheels R32 GTR.

thanks in advance

1)I suspect probably a 25-30% loss through the drive train, so 200RWKW is somewhere like 250-260KW at the flywheel.

2) 4.5 sec 0-100 and maybe 12.6-8 with a good clutch.

[meshmesh]

I don't think a "%percentage" value is fair & accurate eg: Today I make 210kw at the wheels and loose 30% from my engine to the wheels =90kw drivetrain loss.

But if my drivetrain remains the same and I make 300kw at the wheels.. then why would my drivetrain loss be more??

SydneyKid had some facts when they engine dyno'd a car & then put the car on the dyno, and If I recall correctly there was about 70-80kw drivetrain loss from engine to wheels for a GTR, this figure differed for a GTsT.

[ferni]

Yep what meshmesh said - % isn't really right, because why would it loose more when you increase power (ok it maye loose a few kw more due to extra heat etc... but not a %)

I remember reading SK's thread as well explaining it, try and find that

[GTRman1992]

I had a talk about this with some mechanical engineers, there is both a fixed loss and a percentage loss that make up the total loss.

[Sydneykid]

I had a talk about this with some mechanical engineers, there is both a fixed loss and a percentage loss that make up the total loss.

Ahh yes, but the percentage loss is a low percentage. :headspin:

Plus you need to remember that energy can neither be gained nor lost (Newton), it is simply transformed into other forms of energy. In this case, basically heat. So you need to ask yourself, where does all that extra heat go?

To answer JayDee's original question, the 4wd losses are around 70 rwkw at standard power. BTW the 206 kw is a bit of a furphy :bs!: I reckon it's more like 226 kw for an R32 GTR.

PS; Yes, I know about E=MC2 (Einstein) but I assume no atomic reactions when doing my power loss calculations :microwave

[JayDee]

thanks heaps guys. I was just interested in some kind of comparison to factory power specs.