Stock GTS Maloo makes 368rwkw

[fgpsi]

http://youtu.be/4_uUXIj4EXs

[lucas2]

Do hub dyno's generally read higher than the standard chassis dyno?

From what I have seen they make somewhere around that, if not a little higher with a tune only.

[FG50T]

Hub dynos read about 30rwkw more at that power

[MITCHAY]

Originally Posted by lucas2

Do hub dyno's generally read higher than the standard chassis dyno?

From what I have seen they make somewhere around that, if not a little higher with a tune only.

Well you would think so. Wheels are weight on the drive train and then you have to spin the rollers. Most people hate on hub dynos from what I've seen and read.

You don't drive cars without wheels so they seem to be pretty pointless IMO. But I think dynos in any form are only useful as a tuning tool. Unless someone can point out to me why it might be useful.

Still having said that, I still love the whole idea of this ute. Big engine, big brakes and big drivetrain.

[SensationFG8]

Be interested to see more results, I wasn't aware this had a different drive line to the gts.

[Dave R]

Hub dynos are extremely accurate, particularly the one at Tunehouse with the controlled atmosphere. You could run it again next week and get the same figure. If you're going to do a power run for the **** factor, a hub dyno is the best way to do it in my opinion. No arguing about strapping or wheel sizes or in the case of Tunehouse, the weather that day. This is how they should have done the GTF vs GTS comparison.

[ratter]

accurate should be swapped with consistent as tyre slip is not an issue, but fact is different size wheels do affect power outputs

[Whitey-AMG]

Originally Posted by ratter

accurate should be swapped with consistent as tyre slip is not an issue, but fact is different size wheels do affect power outputs

Size, as in diameter affecting the ratio ?
I also think wheel weight plays a big role as well.
Worst case scenario is big diameter heavy weight wheels.......19" FPV wheels anyone !

[AGS302]

Buttnekkid's Manual GTF went 367rwkw stock 10 minutes after an auto went 331rwkw on XFT's dyno. It made 412rwkw after tune.

[2242100]

I've read that Hub Dyno's typically read about 10% under the Flywheel numbers.
If that's the case here then it's looking to me like about 409 kW at the flywheel.
Powerful, but not 430 kW. Perhaps the engine might do better in future with more k's on the clock.

[CSV_LS1]

If you take into account the sort of loss the US dyno's use of 15% then it's bang on the money. I would guess that there is a higher rate of loss on normal dyno's with wheel slip and size to take into account of maybe 20%.

[2242100]

Originally Posted by CSV_LS1

If you take into account the sort of loss the US dyno's use of 15% then it's bang on the money. I would guess that there is a higher rate of loss on normal dyno's with wheel slip and size to take into account of maybe 20%.

I notice that in the latest December 2014 issue of MOTOR, the Ute got a 4.7 to 100 and 12.6 sec 400 metre time with a speed of 185.8 kmh at the end, and I didn't see any mention about hot weather.

The cars seem to have varied a fair bit in tests and I'm talking about end speeds here, which are only minimally affected by the quality of the launch.

I've seen 3 tests where I recall the cars getting to around 190 and 4 where the speed was around 185 kmh at the 400 metre point. So there seems to be quite a bit of variation.

Not knocking the car or the engine though, I think they're great, but I'm puzzled by the variations.

[FPV GTHO]

I don't think it's just about tyre slip and wheel weight, the size of the wheel and the diff gears are supposed to more or less cancel themselves out.

[fgpsi]

Only 12.6 for the maloo gts ? That's sheet

[2242100]

Originally Posted by fgpsi

Only 12.6 for the maloo gts ? That's sheet

To be fair I think that the grip probably wasn't too good because the 0 - 60 kmh time listed is 2.6 seconds and I'm pretty sure that it must have had the power to be at least a few tenths faster.

From applying different 0 - 60 kmh times to 400 metre runs that my stock XR6T did at WSID (using the accurate RACELOGIC software), I've found that around 80-90% of the time lost or gained in the 0 - 60 kilometre (not 60 foot) time will flow into the 400 metre time, but the end speed will hardly be affected.

In my cars case 0-60 kmh in 2.61 seconds, vs an earlier achieved 2.24 seconds time (3.7 tenths difference) would affect a 400 metre time by 3.2 tenths. However the effect on end speed would only be 0.24 kmh (180.04 vs 180.28 kmh).

So I guess the important data to look at is rolling acceleration and end speed.

[WHYME]

Sounds good doing it too.