Heavy rims vs light affect dyno?
Thread Starter
On The Tree
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Heavy rims vs light affect dyno? Im not sure if this is right spot to put this
I have a 2012 Silverado ext cab 5.3 and I have long tube headers and y pipe and I got 268 to the wheels.
my buddy has a 2010 Silverado 4 door silverado 5.3 and he said he got around 280 to wheels without headers.
I have 22 steelies and he has 22 replicas.
if I got lighter rims will my dyno numbers go up ?
I have a 2012 Silverado ext cab 5.3 and I have long tube headers and y pipe and I got 268 to the wheels.
my buddy has a 2010 Silverado 4 door silverado 5.3 and he said he got around 280 to wheels without headers.
I have 22 steelies and he has 22 replicas.
if I got lighter rims will my dyno numbers go up ?
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If it's an inertial dyno (DynoJet) then yes they will have an effect.
If it's a steady-state type (Mustang) then no.
I don't think your wheels are having near that much effect. To me that looks like you're about 30 HP short of a direct comparison to your bud's. Of course dynos don't work that way; different "correction factors", among other things, can DRAMATICALLY influence the absolute #s you get from one. They're not like a thermometer or a bathroom scale or something. Only meaningful comparison would be, run one, back it off, run the other. Same dyno, same operator, same day, same conditions. Anything else, who knows what you'll get.
If it's a steady-state type (Mustang) then no.
I don't think your wheels are having near that much effect. To me that looks like you're about 30 HP short of a direct comparison to your bud's. Of course dynos don't work that way; different "correction factors", among other things, can DRAMATICALLY influence the absolute #s you get from one. They're not like a thermometer or a bathroom scale or something. Only meaningful comparison would be, run one, back it off, run the other. Same dyno, same operator, same day, same conditions. Anything else, who knows what you'll get.
Thread Starter
On The Tree
Joined: Aug 2018
Posts: 136
Likes: 0
If it's an inertial dyno (DynoJet) then yes they will have an effect.
If it's a steady-state type (Mustang) then no.
I don't think your wheels are having near that much effect. To me that looks like you're about 30 HP short of a direct comparison to your bud's. Of course dynos don't work that way; different "correction factors", among other things, can DRAMATICALLY influence the absolute #s you get from one. They're not like a thermometer or a bathroom scale or something. Only meaningful comparison would be, run one, back it off, run the other. Same dyno, same operator, same day, same conditions. Anything else, who knows what you'll get.
If it's a steady-state type (Mustang) then no.
I don't think your wheels are having near that much effect. To me that looks like you're about 30 HP short of a direct comparison to your bud's. Of course dynos don't work that way; different "correction factors", among other things, can DRAMATICALLY influence the absolute #s you get from one. They're not like a thermometer or a bathroom scale or something. Only meaningful comparison would be, run one, back it off, run the other. Same dyno, same operator, same day, same conditions. Anything else, who knows what you'll get.
Saw a comment long time ago 18 pound factory rim vs heavy ~30 pound aftermarket rim with same tires on a Dyno. The 30 pound rim dyno'd 3 to 4 whp less than the 18 pound rim.
Also saw where a higher hp car with a set of tires that spun dyno'd 50 whp less than the same car did when , some VHT was sprayed and the tires didn't spin.
Also saw where a higher hp car with a set of tires that spun dyno'd 50 whp less than the same car did when , some VHT was sprayed and the tires didn't spin.
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Verdad Gallardo BTW - while the 30 pound rims had a ~3hp loss on the dyno, it's actually worse than that real world. On the dyno only two rear wheels were turning. On the street all four heavy 30 pound rims are turning so I think it is really more like ~6-8whp is being wasted by those heavy rims.
Looking forward to your update.
Here's a test with three sets of rims on a 2012 SS Camaro that's a good read.
Light vs heavy rims dyno'd on 2012 SS Camaro
Here's a test with three sets of rims on a 2012 SS Camaro that's a good read.
Light vs heavy rims dyno'd on 2012 SS Camaro
TECH Addict
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same place same person different day dyno jet
Doesn't too much matte in the end though. Although I'll race just about ANYTHING, even a few things I'm embarrassed to admit I've actually raced against ... another, can't say I've ever raced one dyno # against another before. Best to just concentrate on how the truck PERFORMS as opposed to trying to generate eye-popping dyno numbers.
