C6 wheels on a C5
Thread Starter
Race Director
Joined: Aug 2002
Posts: 10,244
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From: not far enough from Chicago
C6 wheels on a C5
I asked this question a long time ago but can’t remember the answer.
I replaced my C5 18” 17” aftermarket chrome wagon wheels with C6 19”18”
OEM chrome wheels.
The C6 wheels caused a loss in power. The aftermarket Wagon wheels
were possibly heavier than the C6 wheels.
This isn’t just a seat of your pants loss of power it is FOR SURE.
I was given educated answers, not just guess work. Can anybody tell why it resulted in power loss?
Is there something I can do without changing back to the factory size C5 18/17 wheels?
I replaced my C5 18” 17” aftermarket chrome wagon wheels with C6 19”18”
OEM chrome wheels.
The C6 wheels caused a loss in power. The aftermarket Wagon wheels
were possibly heavier than the C6 wheels.
This isn’t just a seat of your pants loss of power it is FOR SURE.
I was given educated answers, not just guess work. Can anybody tell why it resulted in power loss?
Is there something I can do without changing back to the factory size C5 18/17 wheels?
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From: Hickory NC
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Weight of the new wheels might be a factor, and what about overall diameter or tire height? If you went to a taller tire, you have effectively gone to a higher ratio (lower differential number) which could decrease your acceleration.
Thread Starter
Race Director
Joined: Aug 2002
Posts: 10,244
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From: not far enough from Chicago
I'll measure the tire height and compare it to the height of the stock tires. The car was lowered about 1" or 1.5" on the stock bolts many miles before the new wheels were installed which
only have about 4,000 miles on them. The loss happened right after the new tires and wheels(run flats) were installed. These tires are the stock size to fit the C6 wheels.
I would rather get the max power from a dead start. My runway isn't real long to hit a higher speed.
Advanced
Joined: Mar 2021
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My C5 has 19 in rear and 18 in front, former owner put them on, I noticed the TPMS has no readings, and using a magnet on first wheel does not kick off programming. Maybe there are no TPM in them. Does your TPMS work with the larger wheels?
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Melting Slicks
Joined: Aug 2014
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From: East Windsor NJ
I was told that the C6Z rotors (being much heavier than the C5) would also slow you down - which is why I went with 2pc. Once I have the C5's off the car I will weigh both and post.
I know for sure that the C5 wagon wheels are light! Have them now as track day - but once the C6Z brakes go on they will no longer fit (and I have them for sale as well)...
I know for sure that the C5 wagon wheels are light! Have them now as track day - but once the C6Z brakes go on they will no longer fit (and I have them for sale as well)...
Thread Starter
Race Director
Joined: Aug 2002
Posts: 10,244
Likes: 96
From: not far enough from Chicago
Thread Starter
Race Director
Joined: Aug 2002
Posts: 10,244
Likes: 96
From: not far enough from Chicago
I was told that the C6Z rotors (being much heavier than the C5) would also slow you down - which is why I went with 2pc. Once I have the C5's off the car I will weigh both and post.
I know for sure that the C5 wagon wheels are light! Have them now as track day - but once the C6Z brakes go on they will no longer fit (and I have them for sale as well)...
I know for sure that the C5 wagon wheels are light! Have them now as track day - but once the C6Z brakes go on they will no longer fit (and I have them for sale as well)...
Thanks for the checking the weight after you switch them.
Last edited by StevieB; Jun 23, 2021 at 02:45 PM.
Thread Starter
Race Director
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From: not far enough from Chicago
I have the 315 rear end. I got that info off of the codes on the back of a compartment cover.
Last edited by StevieB; Jun 23, 2021 at 03:15 PM.
Thread Starter
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Joined: Aug 2002
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From: not far enough from Chicago
Can anybody tell me what the height of stock C5 tires are?
These C6 tires are about 25" in the front from the floor to the top of the tire. The rear are about 27"
These C6 tires are about 25" in the front from the floor to the top of the tire. The rear are about 27"
Melting Slicks
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Le Mans Master
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From: Oswego IL
Thread Starter
Race Director
Joined: Aug 2002
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From: not far enough from Chicago
Yep, I too have 1 inch hubcentric spacer on rear.
I never had it on a dyno.
The chromed wagon wheels it came with are sold
All I have now are the C6 wheels on the car.
Thread Starter
Race Director
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From: not far enough from Chicago
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