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Old 09-01-2005, 02:22 PM   #1
chillington
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Default So what does a dynamometer do to a AWD vehicle?

I heard it can ruin them. Is this true, and if so what exactly would happen?
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Old 09-01-2005, 02:30 PM   #2
bailey454
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how would it ruin them?
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Old 09-01-2005, 02:30 PM   #3
Basshead
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hehe, just make sure you run it on a 4wd dyno...you will have zero problems
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Old 09-01-2005, 02:38 PM   #4
shemoves
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If it is a 4wd Dyno...it is fine. If it is a 2wd dyno, it can signifcantly damage the all-wheel drive system...its designed to have all four wheels under the same load. If only two wheels are spinning, imagine how much effort the system is going to put into trying to transfer power from the spinning wheels to the stopped ones.

Here in AZ, all the emissions places only have 2wd dynos, so they can not do the part of the test that involves the rollers. Basically, just idle and OBDII...but, they make AWD test every year instead of every other year.
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Old 09-01-2005, 02:58 PM   #5
i102spd
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definitely not good...
click HERE
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Old 09-01-2005, 03:28 PM   #6
matguy
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Default

What would be the effect of simply lifting two of the weels off the ground?
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Old 09-01-2005, 03:31 PM   #7
specialev
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It would try and move the power away from the wheels the car senses to be slipping and to the wheels that are on the dyno. The level of power transferred is not typically what the driven wheels will experience in their normal lives, hence, damage can occur to your car.
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Old 09-01-2005, 03:34 PM   #8
matguy
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So, either way it's not going to be happy.
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Old 09-01-2005, 03:37 PM   #9
specialev
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It will be happy as pie if you use a four wheel dyno and load the wheels equally.
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Old 09-01-2005, 03:40 PM   #10
thrdeye
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.....and we all know that pies are VERY happy.
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Old 09-01-2005, 03:44 PM   #11
specialev
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I'm happy when I am eating pie.

Or apparently just thinking about pie.

mmmmm, pie
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Old 09-01-2005, 03:49 PM   #12
araderboy
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im scared that ill get towed one day and they'll drag the car by the rear tires and total ruin my tranny
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Old 09-01-2005, 04:53 PM   #13
seattle944t
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Quote:
Originally Posted by araderboy
im scared that ill get towed one day and they'll drag the car by the rear tires and total ruin my tranny
And then the Towing company gets to buy you new diffs to replace the ones they damaged by towing it.
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Old 09-01-2005, 05:00 PM   #14
sandwi54
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Talking about towing, if a towing company drags the two back wheels during towing, that will damage the car right? Is the towing company required to pay for the damages by law?
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Old 09-01-2005, 05:03 PM   #15
Protege Menace
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Quote:
Originally Posted by sandwi54
Talking about towing, if a towing company drags the two back wheels during towing, that will damage the car right? Is the towing company required to pay for the damages by law?

damage it, yes

can you get them to pay for it? good luck.
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Old 09-01-2005, 05:05 PM   #16
OrlandoSTi
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No matter what kind of dyno you're on..... They sure do eat up some tires.... I noticed my STi's wheel gap increasing during the process, haha.... However, watching the cars squat on an AWD dyno is sweet....
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Old 09-01-2005, 05:07 PM   #17
Protege Menace
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why? it SHOUDLNT eat up tires if done right.

unless the caqr is at a 45 degree angle to the rollers and is actually spueeling to all hell, the metal rollers should have extreemely low wear on the tires...?
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Old 09-01-2005, 05:08 PM   #18
i102spd
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im pretty sure it's in the suby's manual that the car should only be towed on a flatbed... and the towhooks on the front and rear of the car are not for towing, simply for pulling the car from a ditch
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Old 09-01-2005, 05:10 PM   #19
Calamity Jesus
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Quote:
Originally Posted by OrlandoSTi
No matter what kind of dyno you're on..... They sure do eat up some tires....
Not true. The dynapak hooks directly up to the hubs:


They're good portable tuning devices, but not reliable for advertising numbers.
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Old 09-01-2005, 05:11 PM   #20
Calamity Jesus
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Quote:
Originally Posted by i102spd
im pretty sure it's in the suby's manual that the car should only be towed on a flatbed... and the towhooks on the front and rear of the car are not for towing, simply for pulling the car from a ditch
And tying them down on said flatbed.
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Old 09-01-2005, 07:00 PM   #21
IntraWRX
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Quote:
Originally Posted by Beaverboy
And tying them down on said flatbed.
and on the dyno too.
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Old 09-02-2005, 11:14 AM   #22
ofay
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Quote:
Originally Posted by shemoves
If it is a 4wd Dyno...it is fine. If it is a 2wd dyno, it can signifcantly damage the all-wheel drive system...its designed to have all four wheels under the same load. If only two wheels are spinning, imagine how much effort the system is going to put into trying to transfer power from the spinning wheels to the stopped ones.

Here in AZ, all the emissions places only have 2wd dynos, so they can not do the part of the test that involves the rollers. Basically, just idle and OBDII...but, they make AWD test every year instead of every other year.
SCC had a problem trying to dyno an M3 because its not 4wd, but it wont let the rear wheels spin faster than the front wheels or somehting like that, and on the 2wheel dyno it had a **** fit trying to transfer the power, which resulted in it showing very little hp on the dyno
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