Hub vs Chassis dyno 500kw

[Zlat347]

Has anyone put there car on both a roller and hub dyno? What was the difference?

 

I know a fair few people run high 400 or 500rwkw on the barra but are they genuine 500rwkw on roller or hub?

 

Most people ive spoken to tell me 80-100rwkw difference between the 2 dynos. 

[camo86T]

Would depend on power level but definitely makes a fair difference.

Even between roller dynos there can be substantial differences, plenty of 'happy' dynos out there as well as tuners who aren't above fiddling numbers for wank factor... #bravotangoalpha

My first basic mods by Tunehouse back in 2011 were done on their hub dyno, made 375rwkw on full send thru the baby turbo at around 19psi.... on 98 lol

Even allowing for some possible dyno sheet magic for a new customer and the fact that manuals read slightly higher, there's no way that combo would've made more than 320~330rwkw on a roller dyno

 

To put it into perspective, 3 years later I got fuel pump, intercooler & turbo mods done, on 98 @ 18psi made 382rwkw on CMS's proven 'honest' mainline roller

 

Original tune

'Real' numbers aside, it pulled bloody hard from the get go.... RIP gt3576 lol

[JETURBO]

Depends on what style HUB, what chassis dyno and comparisons 

 

the variation can be massive from the happiest HUB to the harshest chassis dyno 

 

what are you trying to gain from this thread ? 

[arronm]

XFT had there mainline chassis dyno and mainline hub dyno at the same time for a while after they purchased the hub dyno.  Each read within 5rwkw of each other.

 

I hear the same for Monster torque hub dyno which reads similar to XFT hub dyno 

 

Maybe other tuners dont get theirs set up correctly

[k31th]

If you set them up the same, physics says the hub dyno will read higher than a chassis/roller dyno as there's un-sprung weight in the wheels/tyres and also losses due to friction which takes away from the final measured power figure on a chassis/roller dyno.

 

That being said, you can set up hub dyno's to get different results which may or may not be closer to how a chassis dyno reads.

 

Honestly, it doesn't matter, as they're just a tool used for tuning. Go to the same dyno throughout your modding/tuning escapade and you can get a "before" and "after" each round of mods and get your accurate increases over the "before" figures, which is all you basically need to be able to brag about dyno figures.

[arronm]

Yep.  Its the gain that matters

 

With all the high powered cars now.  1000rwkw on a chassis dynos are just  not efficient or fit for purpose. 

 

Its 2020 no one should be using a 2 wheel chassis dyno anymore. 

 

I wouldn't be happy if my tuner didnt use all the latest tech.

 

Its like a doctor doing brain surgery with a hammer and chisel.

Edited 14/05/20 01:48 AM by arronm

[Zlat347]

3 hours ago, JETURBO said:

Depends on what style HUB, what chassis dyno and comparisons 

 

the variation can be massive from the happiest HUB to the harshest chassis dyno 

 

what are you trying to gain from this thread ? 

 

Agree. 

 

So alot of people pushing these stock fg motors with supporting bolt on mods to the limits 450 500rwkw. 

 

Are these chassis or hubs, a genuine 450 500 roller could be 550 600 hub dyno kw. 

 

I have a barra in a 66 mustang. It's ran a 9.5 @146 So far at 500rwkw hub dyno. 3584rs, tbre cams, the usual bolt one gears, head studs, valve springs. Ran the 9.5 with pulling timming due to inefifienct intercooler and IAT being high.

 

I know I'm playing with fire, but figure what real power is it making and can we squeeze some more into it. (This is just the engine I put in to get the car engeneered) fg turbo motor. Before building a motor. 

 

Ive now ordered a plazmaman intercooler, hpc coating some exhuast bits and will maybe turn it up to try get closer to that 9.0 

[Zlat347]

6 hours ago, camo86T said:

Would depend on power level but definitely makes a fair difference.

Even between roller dynos there can be substantial differences, plenty of 'happy' dynos out there as well as tuners who aren't above fiddling numbers for wank factor... #bravotangoalpha

My first basic mods by Tunehouse back in 2011 were done on their hub dyno, made 375rwkw on full send thru the baby turbo at around 19psi.... on 98 lol

Even allowing for some possible dyno sheet magic for a new customer and the fact that manuals read slightly higher, there's no way that combo would've made more than 320~330rwkw on a roller dyno

 

To put it into perspective, 3 years later I got fuel pump, intercooler & turbo mods done, on 98 @ 18psi made 382rwkw on CMS's proven 'honest' mainline roller

 

Original tune

'Real' numbers aside, it pulled bloody hard from the get go.... RIP gt3576 lol

 

thanks for sharing your graphs. definitely interesting.