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The Pub For General Automotive Related Talk |
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#1 | ||
FF.Com.Au Hardcore
Join Date: Feb 2011
Location: Richmond, VIC
Posts: 1,668
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#2 | ||
FF.Com.Au Hardcore
Join Date: Jul 2011
Posts: 1,011
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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. |
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#3 | |||
FF.Com.Au Hardcore
Join Date: Apr 2005
Location: Canberra
Posts: 13,392
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Quote:
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. |
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#4 | ||
FF.Com.Au Hardcore
Join Date: Sep 2010
Location: Melbourne
Posts: 935
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Hub dynos read about 30rwkw more at that power
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#5 | ||
FF.Com.Au Hardcore
Join Date: Dec 2009
Location: Melbourne
Posts: 1,705
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Be interested to see more results, I wasn't aware this had a different drive line to the gts.
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Previous Rides Bionic BA MKII XR6T 245kW I6 Turbo, 6spd Manual Grey (yuk what was I thinking) AH Astra CDX Coupe 93kW NA I4, 5spd Manual Sensation FG XR8 290kW NA V8, 6spd Automatic Current Rides Octane GTF SC V8, 6spd Manual, Manta 3" X pipes and hotdogs Starlight Lotus Evora S 258kW SC V6, 6spd Manual |
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#6 | ||
Member
Join Date: Aug 2006
Posts: 4,940
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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.
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#7 | ||
FF.Com.Au Hardcore
Join Date: Feb 2005
Location: Pit Lane
Posts: 11,867
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accurate should be swapped with consistent as tyre slip is not an issue, but fact is different size wheels do affect power outputs
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Pit Lane Performance 20 Rosella St Frankston 03 9783 8122 Authorised Streetfighter, Pcmtec , SCT & HP Tuners Tuning Agent,
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#8 | |||
AWD Assassin
Join Date: Dec 2004
Posts: 8,170
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Quote:
I also think wheel weight plays a big role as well. Worst case scenario is big diameter heavy weight wheels.......19" FPV wheels anyone ! |
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#9 | ||
FF.Com.Au Hardcore
Join Date: May 2008
Location: Mackay
Posts: 656
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Buttnekkid's Manual GTF went 367rwkw stock 10 minutes after an auto went 331rwkw on XFT's dyno. It made 412rwkw after tune.
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2009 FPV GS 302 #250/250 ZF And Leather *Herrod Airbox *X-Force 2.5" Cat Back Custom tuned by Ben at Auspeed Tuning Mackay to 270.5rwkw. |
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#10 | ||
FF.Com.Au Hardcore
Join Date: Nov 2013
Posts: 618
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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. |
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#11 | ||
I used to have a nice car
Join Date: Dec 2004
Posts: 1,993
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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%.
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#12 | |||
FF.Com.Au Hardcore
Join Date: Nov 2013
Posts: 618
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Quote:
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. |
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#13 | ||
FF.Com.Au Hardcore
Join Date: Jul 2006
Posts: 7,331
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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.
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#14 | ||
FF.Com.Au Hardcore
Join Date: Feb 2011
Location: Richmond, VIC
Posts: 1,668
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Only 12.6 for the maloo gts ? That's sheet
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#15 | ||
FF.Com.Au Hardcore
Join Date: Nov 2013
Posts: 618
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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. |
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#16 | ||
Next up?
Join Date: Jul 2013
Location: Melbourne
Posts: 482
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Sounds good doing it too.
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If it ain't a Ford you're bored. Blue blooded to the core. ![]() |
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