205hp???? - Chevy Cobalt SS Forum : Chevrolet Cobalt SS Forums
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post #1 of 16 (permalink) Old 09-20-2006, 09:53 PM Thread Starter
 
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205hp????

Ok, anyone who has seen any of my posts know that I don't know ANYTHING about cars. However, I own a 2006 SS/SC (G35 package, black w/ 20% tint). My question is why do people dyno more than 205? Is that 205 posted by GM suppose to be estimated hp at the wheels? I am just confused over why some dyno as much as 213 bone stock if it is only suppose to have 205 at the flywheel. Which brings me to my next question....when your car is dyno'd , is that the hp at the wheels. I apologize for being dumb, but I am trying to fix the problem by asking these questions. One reason I am asking the question is I have a friend with a 99 integra that he just turbocharged. Says he has 230 at the wheels and I think its legit. Can I pull on him with a stage 2 kit? MY MAIN QUESTION IS WHY IS THERE SUCH INCONSISTANCY WITH THE HP RESULTS, AND IS THAT AT THE WHEELS OR AT THE FLYWHEEL. Any input is necessary. And don't respond by talking about how your brothers ex-sister in law wrecked her ss/sc while racing an integra and ended up losing one of her kidneys. PLEASE KEEP THIS ON TOPIC!
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post #2 of 16 (permalink) Old 09-21-2006, 06:36 AM
 
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Because a lot of companies will under-rate the car for insurance purposes, because they target younger kids/adults for these cars and know if they put in writing "240-250bhp" the insurance for the market the target will be higher thus getting them less sales.

But I do know now that the government is cracking down on this and wants them to estimate acurately and correctly. They did this with the Dodge Neon SRT-4 it was said to be 230bhp but people dynoed 220-235whp+ which would be about 260-265bhp in reality.

They did this on the Evo 9 too...

I've seen a stock dyno on a SS/SC as high as 221whp
Here is the dyno

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post #3 of 16 (permalink) Old 09-21-2006, 09:41 AM
 
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Technically a K&N dropin filter != stock.

Sometimes if you look at a dyno you can tell HOW they underrated.

Looking at the dyno above I could say that car puts out 205hp based on (Ill just use 15% DTL ..I dont know the real figure) 205HP * .85 = 174whp...

So i locate 174/175hp on the dyno sheet... and say the cobalt ss makes 205hp @ 5100rpm. Am I lying?? No. Is that what the car really makes for power? Well yes..but not PEAK power.

Sometimes GM is just evil and under rates a motor to make Y-body owners feel better about themselves. It all depends.
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post #4 of 16 (permalink) Old 09-21-2006, 11:17 AM
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That is the exact graph I got when dynoed stock. At least they are consistent

We need more boost!

K&N CAI, GMPP exhaust w/XTC 3" d-pipe,
Ported stock exhaust manifold, B&M Shifter
Stage 2 w/2.8, DC Sport sturt brace,
Torque brace, CAB's, poly Trans mounts,
225/40/18 BFG KDW2 tires
GM drilled rotors w/Hawk Pads
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post #5 of 16 (permalink) Old 09-21-2006, 02:31 PM
 
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Also take into account the "drivetrain loss" factor. Many companies, especially japanese, will cite there horsepower as the actual crank horsepower. This is why a new corolla or a camry may have a 268hp rating, but on a dyno it has no where near that simply because it loses so much power transfering it from the flywheel to the pavement.

Also, its a common occurance to dyno the same car three times and get three totally differant numbers. Temperature, humidity, elevation, wind, etc can all have significant effects on output.
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post #6 of 16 (permalink) Old 09-22-2006, 03:14 PM
 
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Very true..and good points.
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post #7 of 16 (permalink) Old 09-26-2006, 07:27 PM
 
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Quote:
Originally Posted by jwolf8604 View Post
Ok, anyone who has seen any of my posts know that I don't know ANYTHING about cars. However, I own a 2006 SS/SC (G35 package, black w/ 20% tint). My question is why do people dyno more than 205? Is that 205 posted by GM suppose to be estimated hp at the wheels? I am just confused over why some dyno as much as 213 bone stock if it is only suppose to have 205 at the flywheel. Which brings me to my next question....when your car is dyno'd , is that the hp at the wheels. I apologize for being dumb, but I am trying to fix the problem by asking these questions. One reason I am asking the question is I have a friend with a 99 integra that he just turbocharged. Says he has 230 at the wheels and I think its legit. Can I pull on him with a stage 2 kit? MY MAIN QUESTION IS WHY IS THERE SUCH INCONSISTANCY WITH THE HP RESULTS, AND IS THAT AT THE WHEELS OR AT THE FLYWHEEL. Any input is necessary. And don't respond by talking about how your brothers ex-sister in law wrecked her ss/sc while racing an integra and ended up losing one of her kidneys. PLEASE KEEP THIS ON TOPIC!
It is the G85 package lol/ You could probaly give him a decent run now. He can probaly only safely hit 7 pounds of boost in that Inegra.
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post #8 of 16 (permalink) Old 09-27-2006, 06:59 PM Thread Starter
 
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haha, i realized that after I did it. lol. Yea guys...I drive an Infinity!!! lol. sorry for the screw up. Yea, he said he is gonna run 7 lbs. You think I can hold my own without a stage kit???? puts him at 230 not including his exhaust and I have 210 (cause stock 205 is def. under appreciated). I haven't ran my mouth to him but if I line up and race, i really want to think that I can win.
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post #9 of 16 (permalink) Old 10-03-2006, 03:27 PM
 
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Honestly, I believe Integras are lighter then a Cobalt. Power to weight ratio favors him, but torque in a VTEC engine is pathetic.
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post #10 of 16 (permalink) Old 10-03-2006, 03:45 PM
 
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GO FOR IT.... let me know what happends!
my lil bro's friend claims to have this 'really quick' SINGLE cam non/vtec turbo'd plus i think a 50 shot nos.
now my bro said he will front the $$$ to run for about $50-$100 or so for me if i do it. the reason being that this kid keeps saying he can beat any cobalts out there even though he hasnt ran one yet.... lol
i've had a honda turbo'd b4 running in the high 13's but it was an h22, dual cam vtec. big difference....

so do it and let me know what happends.
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