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So do cat backs add any power?

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Old 07-14-2014, 04:18 PM
  #21  
RetiredSFC 97
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Originally Posted by F&Yb0dluvr
I don't know where you're getting your information from C5's put down anywhere from 290-320 at the wheels depending on year and transmission which is right with GM's flywheel rating.
My stock FRC dynoed at 312.
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Old 07-14-2014, 05:10 PM
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Originally Posted by sfc rick
Really, this like Nascar officials debating whether or not the move from satin finish over a gloss finish paint gives an unfair advantage over the guys who have two painted numeral's over the ones who only sport a single number.

IMHO unless you're max effort looking for 1/10ths of a second off your ET, any marginal gain from catbacks is immaterial on an otherwise stock engine. Even comparing to a bone stock car any difference would be easily mitigated by the driver.

Add headers/x-pipe/cam into the mix and I'd be interested in hearing the difference.

Originally Posted by Camjamsdad
My point was gm over stated the hp ratings on the c5's. Call me old fashioned but if I buy a car advertised as 345 or 350 horsepower I expect to receive that. Instead I get a car with an anemic 290 horsepower. I could tolerate being off a little but we're talking 60 horsepower or almost 20% less.
Take your engine out of the car, put it on an engine dyno, report back.
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Old 07-14-2014, 06:27 PM
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Originally Posted by jmxp69
IMHO unless you're max effort looking for 1/10ths of a second off your ET, any marginal gain from catbacks is immaterial on an otherwise stock engine. Even comparing to a bone stock car any difference would be easily mitigated by the driver.

Add headers/x-pipe/cam into the mix and I'd be interested in hearing the difference.



Take your engine out of the car, put it on an engine dyno, report back.
[
Yep.. Big difference between Crank HP and the parasitic loss through the output shafts to the wheels that all vehicles suffer from. Actually the Vette does well in the powetrain loss category and pretty efficient.
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Old 07-14-2014, 06:30 PM
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Originally Posted by RetiredSFC 97
My stock FRC dynoed at 312.
Generous Dyno or you had a tune!!

That means that your 345 HP engine only loss 33 HP from crank to wheels or .09 % loss.

That's pretty incredible!
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Old 07-14-2014, 06:37 PM
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Originally Posted by bikeriderga
Generous Dyno or you had a tune!!

That means that your 345 HP engine only loss 33 HP from crank to wheels or .09 % loss.

That's pretty incredible!
uhm..9.5% loss.
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Old 07-14-2014, 06:39 PM
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Originally Posted by jmxp69
uhm..9.5% loss.
Still better than 95% of any I've seen!

Of course, engine builds are subjective. Some actually put out a little less than advertized and some more. But that # is suspect from a totally stock 345 HP car.
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Old 07-14-2014, 06:47 PM
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Originally Posted by bikeriderga
Still better than 95% of any I've seen!

Of course, engine builds are subjective. Some actually put out a little less than advertized and some more. But that # is suspect from a totally stock 345 HP car.
Agree, there are lots of variables that could have made this possible but it sounds outside the norm for stock.
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Old 07-15-2014, 06:53 AM
  #28  
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Originally Posted by lionelhutz
Good catbacks can add a few HP, in the 8-12HP range.

You'll get a little. More sound than HP. Got to open up the entire system for noticeable HP gain.
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Old 07-15-2014, 10:21 AM
  #29  
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Originally Posted by calinator
Or none at all, or anything performance related like throttle response? Just thought I'd make a post cause I haven't posted in a while haha. I believe it's been debated on both sides that it does or doesn't. I've got Corsa Xtremes by the way
I have Corsa Extremes on my 02 Z06. Sounds better, but I do not believe there is any increase in power. Increase in noise does give the "perception" of more power and responsiveness.
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Old 07-15-2014, 08:08 PM
  #30  
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Originally Posted by F&Yb0dluvr
I don't know where you're getting your information from C5's put down anywhere from 290-320 at the wheels depending on year and transmission which is right with GM's flywheel rating.
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Old 07-15-2014, 09:10 PM
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I don't think they add any noticeable HP. I think the main reason most change is for a change in sound only.
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