4 Wheel Dyno Kw And Rear Wheel Dyno Kw

[PhilGTR]

Hey guys

I got my car dynoed again today and I just want to try and clarify the difference between rwkw's and 4wkw's on GTR's.

The last time I got it done on a rwd dyno and it came up as 253rwkw at UAS.

Today I have the same mods as last time but just adjusted the boost response i made 257kw @ all 4 wheels at CRD.

Now Jim at CRD said to me the difference between rwd and 4wd is around 30kw give or take and that sounds a bit too much to me. When i tested my car today, it felt like maybe at max an extra 10-15kw at the wheels difference(but thats just my judgement). I also read somewhere here people were saying around 4% difference between 4wd and rwd for r32gtr's.

Also last time my stock injector duty cycle at full power were at around 80-82%.

Now Jim reckons I wont be able to make anymore power safely because of my injectors maxing out which I assume would at least be 90% plus? But need to confirm this later.

Stock injectors max out at around 280rwkws or so?? So does this make sense to assume its around a 4-5% loss between rwd and 4wd? Opinions wanted please!

Cheers

[luke20t]

when your car is in AWD mode it is supposed to make less power to the wheels because you got power being lost at the front wheels, aswell as the rear wheels.

[N I B]

GTRs are a bit odd on a 4wd Dyno as their not full time 4wd.

[GTRsean]

Talked briefly to Mark at Hills motorsports Castlehill the other day and he said he sees 20-25 kw difference in RWKW and AWKW.

He has a 4WD dyno dynamics dyno by the way.

[Leewah]

I had my car dynoed at Melbourne Autosalon in both RWD and AWD within a span of 24 hours of each other and no changes were made to either the dyno or the car except for the removal of the driveshaft.

In AWD, my car made 604awkw and in RWD, the car made 617rwkw.

Regardless of how the dyno was configured intially, all the settings for both the dyno and the car remained the same. The only thing which changed was the ambient temperature and humidity in the Melbourne Exhibition Building which would be considered as negligable.

Hope this info helps.

[R31Nismoid]

This has been covered before

http://www.skylinesaustralia.com/forums/in...3&hl=*awkw*