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-   Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons (https://www.camaro5.com/forums/forumdisplay.php?f=11)
-   -   power ratings? (https://www.camaro5.com/forums/showthread.php?t=13270)

mp11 02-10-2009 09:45 PM

power ratings?
 
Hello everyone. Just a bit curious about the HP ratings on this LS3. I've seen 430 and 426, not sure which is acurate. But my question is, back in the early days many of these engines were "underrated", in some cases very underrated because of insurance purposes or whatever. Is it believed that the LS3 may also possess more than the advertised HP? Do car companies still do that?

Milk 1027 02-10-2009 09:47 PM

Quote:

Originally Posted by mp11 (Post 285596)
Hello everyone. Just a bit curious about the HP ratings on this LS3. I've seen 430 and 426, not sure which is acurate. But my question is, back in the early days many of these engines were "underrated", in some cases very underrated because of insurance purposes or whatever. Is it believed that the LS3 may also possess more than the advertised HP? Do car companies still do that?

It's officially 426hp. and yes it might be underrated.But we still don't know that

PQ 02-10-2009 10:04 PM

Don't care. This car is purdy. :wub:

THE EVIL TW1N 02-12-2009 12:29 AM

Quote:

Originally Posted by mp11 (Post 285596)
Hello everyone. Just a bit curious about the HP ratings on this LS3. I've seen 430 and 426, not sure which is acurate. But my question is, back in the early days many of these engines were "underrated", in some cases very underrated because of insurance purposes or whatever. Is it believed that the LS3 may also possess more than the advertised HP? Do car companies still do that?

With the SAE certification, it is impossible to "underrate" an engine. The only way is if the manufacturer chooses not to SAE Certify their engine (4.6 3v in the Mustang, 6.1 Hemi, etc.).

The LS3 and it's variances (GXP, Corvette, Camaro, etc.) are all SAE Certified.

TomServo 02-12-2009 12:12 PM

The LS3 in the vette is rated 430 and 436. All other applications will most likely be lower. Example the Camaro is rated at 426.

Tom

BTW the 436 rating is with the optional Z06 exhaust.

JJ#48Racing 02-12-2009 01:33 PM

Quote:

Originally Posted by TomServo (Post 287821)
The LS3 in the vette is rated 430 and 436. All other applications will most likely be lower. Example the Camaro is rated at 426.

Tom

BTW the 436 rating is with the optional Z06 exhaust.

It's not a Z06 exhaust. It has bypass valves like the Z06, but it is 2.5", the Z06 is a 3".

As stated earlier, the LS3 is SAE certified and that would make it impossible to underrate.

DGthe3 02-12-2009 06:13 PM

Quote:

Originally Posted by THE EVIL TW1N (Post 287298)
With the SAE certification, it is impossible to "underrate" an engine. The only way is if the manufacturer chooses not to SAE Certify their engine (4.6 3v in the Mustang, 6.1 Hemi, etc.).

The LS3 and it's variances (GXP, Corvette, Camaro, etc.) are all SAE Certified.

You don't understand engineers very well, do you? They say that the fastest way to get something done is to tell an engineer its impossible. Its a game for both sides. The SAE creates the rule book to even out the playing field. But like any other rulebook, its a paperback not chiseled in stone. There are ways to bend it which ever way you want. The manufacturers will try and get around the test procedure (in many cases, they help to write the procedure) and engines will be under rated (or over rated as the case may be). Then a new procedure will be created and the cycle will continue.

For reference, the 5.7L hemi in the Challenger (370 crank hp rating) dynos at about 335 to the wheel. The LS3 in the G8 has dyno'd 370 to the wheel (415 crank rating). This is approximately a 10% driveline loss. One of three this is going on here:

1. Those engines were unsually strong
2. They have very low drive line losses
3. They're under rated.

I'm leaning towards #3 because if you assume the standard 15% driveline loss from the 'regular' versions (390 hp Hemi, 436 hp LS3) you get . . . 332 and 371 which within error margin of what they dyno'd at.

Milk 1027 02-12-2009 06:18 PM

Quote:

Originally Posted by DGthe3 (Post 288241)
You don't understand engineers very well, do you? They say that the fastest way to get something done is to tell an engineer its impossible. Its a game for both sides. The SAE creates the rule book to even out the playing field. But like any other rulebook, its a paperback not chiseled in stone. There are ways to bend it which ever way you want. The manufacturers will try and get around the test procedure (in many cases, they help to write the procedure) and engines will be under rated (or over rated as the case may be). Then a new procedure will be created and the cycle will continue.

For reference, the 5.7L hemi in the Challenger (370 crank hp rating) dynos at about 335 to the wheel. The LS3 in the G8 has dyno'd 370 to the wheel (415 crank rating). This is approximately a 10% driveline loss. One of three this is going on here:

1. Those engines were unsually strong
2. They have very low drive line losses
3. They're under rated.

I'm leaning towards #3 because if you assume the standard 15% driveline loss from the 'regular' versions (390 hp Hemi, 436 hp LS3) you get . . . 332 and 371 which within error margin of what they dyno'd at.

10.83%:thumbsup:

DGthe3 02-12-2009 10:47 PM

Quote:

Originally Posted by Milk 1027 (Post 288248)
10.83%:thumbsup:

yes . . .
Quote:

Originally Posted by DGthe3 (Post 288241)
. . .
For reference, the 5.7L hemi in the Challenger (370 crank hp rating) dynos at about 335 to the wheel. The LS3 in the G8 has dyno'd 370 to the wheel (415 crank rating). This is approximately a 10% driveline loss. One of three this is going on here:
. . .


1982camaro 02-12-2009 10:51 PM

i heard the gtr is underrated at 480 hp, i heard its really 500 plus hp

THE EVIL TW1N 02-12-2009 11:08 PM

Quote:

Originally Posted by 1982camaro (Post 288624)
i heard the gtr is underrated at 480 hp, i heard its really 500 plus hp

it could be. it's not an SAE certified engine.

GOT PSI 02-12-2009 11:36 PM

Quote:

Originally Posted by 1982camaro (Post 288624)
i heard the gtr is underrated at 480 hp, i heard its really 500 plus hp

Too bad no one said this to the GTR's tranny. LoL

DGthe3 02-12-2009 11:39 PM

Quote:

Originally Posted by GOT PSI (Post 288690)
Too bad no one said this to the GTR's tranny. LoL

GTR: Get Transmission Replaced

1982camaro 02-12-2009 11:47 PM

Quote:

Originally Posted by DGthe3 (Post 288694)
GTR: Get Transmission Replaced

this is why i hate all this paddle shift, dual clutch, semi-manual crap.



if nissan just put in three pedals than they would of never had this problem.


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