Dyno testing a AWD vehicle

[GTO_VR4]

how do you dyno test a AWD car?

 

[f50]

dyno tester for awd already are able for the public.
but are to hard to find.(at least in my area)

 

[vat_man]

Yeah - it's the same in Sydney, I think there's only 2 or 3 in town. We can probably thank the popularity of the WRX for there being any at all!

It's like regular dyno testing except they've got to measure power from four wheels.

 

[LoudMusic]

I would assume there are two sets of adjustable rollers or something.

 

[Mugen]

remove front driveshaft or the fuse to disengage AWD

then dyno liek any other car

 

[Dj Def]

yea ive seen one in my area

 

[MazKid]

They have 1 lane for AWD/4WD cars at the emissions testing station....I assume that probably the front roller is adjustable and then they use the back wheels or vice versa I haven't seen it in use...then they have free rollers that come up in front and in back of the tires to hold it in place.

That's how the 323 was tested minus 1 roller...

 

[Hooligan]

Originally posted by LoudMusic
I would assume there are two sets of adjustable rollers or something.

There is one like that, but it is expensive to install in a garage, and even then it may not be used all the time (given that far less than 50% of all vehicles are truly 4WD). There is the DynaPack (http://www.dynapack.com), which is basically portable. Rather than having the car sit on rollers, the car is put on a lift and raised 18-24". All four wheels are removed and four modules are attached to the wheel hubs. Then run the car as you would on a normal Dyno. From what I hear, it's a very good tool, and a lot of new & existing Subaru tuners are using it.

 

[vat_man]

Originally posted by Mugen
remove front driveshaft or the fuse to disengage AWD

then dyno liek any other car

That would give a misleading result, as power transmission losses through to the rear wheels would not be represented.

 

[Dj Def]

Originally posted by vat_man


That would give a misleading result, as power transmission losses through to the rear wheels would not be represented.

wut he said

he beat me to it

 

[1X83Z]

Originally posted by MazKid
They have 1 lane for AWD/4WD cars at the emissions testing station....

Do you only have to do emission tests in Saint Louis, or do you have to do it in the whole of Missouri?

 

[MazKid]

Erm...I'm not sure Doug...I think it's just STL and KC maybe I donno...

 

[1X83Z]

Yeah, probably. Those polluted industrial cities.

 

[MazKid]

heh...Then you go right over the river into E-STL (illinois) where there's tons of smog and grime and it's free emissions day every day there...insane.

But it's ok with me...

 

[1X83Z]

Heh, yeah, East Saint Louis is a pretty tough town. I rate it right up there with Gary, Indiana and sections of Pittsburgh.