I was wondering if the ls2 is underrated at 400hp? I have read many places that the ls1 is actually over 360hp. (After breakin period.)

Any thoughts :huh:

It is for sure underrated. Its really more like 415 or 420 I hear.

Well the LS1 once broken in can be around 360 crank, but as for the LS2, it hasn't been in the cars long enough to really determine if its underrated or not. you'll have to wait for some repeated dyno results on stock engines before one can determine.

Originally posted by YellowGoatNick@Dec 17 2004, 03:27 PM
It is for sure underrated. Its really more like 415 or 420 I hear.
I would probably agree with that. But only time will tell... (And a few sets of dyno results.)

I used to hear about GM (and other divisions/makes, as well) playing marketing games when swapping engines. In this case, lowering the stated HP to not upset Corvette buyers.
It would make total sense to just lower the ratings and keep everybody happy- Chevy, current/potentian 'Vette buyers and ultimately, GTO buyers who know they have "a bit more".

I saw some "information" that the target for the motor in the design phase was 400 HP, and the initial preproduction engines came out at 390-395 and they had to make some changes to stretch and get to the 400 number. I don't think they are under rated. On the other hand, I think everyone has learned from the Cobra recall a couple years ago not to overrate their engines either. Remember, we're not in the days of 350's being rated at 190HP anymore. GM is producing a production normally aspirated pushrod V-8's making over 1HP per CI. The LS2 is picking up 50HP and only going up 18 cubic inches of displacement from the LS1.

Check out this months Popular Hot Rodding...in it they dyno test a 2005 C6 Corvette and also discover a glitch in the programming of the engine. They tell of a torque algorythim that closes the throttle during full throttle shifts. because dyno runs are done in only one gear it didn't show up until they went in to "tune" the computer. This algorythim is on ALL ls2 motors reguardless of trans or car type. the article went on to say, by defeating the TA...installing headers and 3.90 gears they ran an 11.57 in the quarter!!( they ran on slicks).This may explain the soft 0-60 times the magazines are getting. GM could say they have a 400 horse motor, back it up with dyno runs, but the computer wouldn't let you use all of it during flat out acceleration runs. Talk about being cheated!!

I wouldnt be shocked. Though that shouldnt be too hard to take care of once proper software managment of the LS2 is available.

Originally posted by wmills619@Dec 17 2004, 02:35 PM
I was wondering if the ls2 is underrated at 400hp? I have read many places that the ls1 is actually over 360hp. (After breakin period.)

Any thoughts :huh:
I hope not. It was beat by a big heavy 4-door sedan. So if it is under-rated something is way wrong.

But like someone posted; there is a glitch in the GTO Matrix! We need to send Neo in to get agent Smith out of the code!!!!!! :type:

One was dynoed over the weekend and came out at 346/351 to the wheels. At 15% loss, that's 398hp. So they seem to be rated pretty accurate.

Originally posted by Rob@Jan 31 2005, 03:01 PM
One was dynoed over the weekend and came out at 346/351 to the wheels. At 15% loss, that's 398hp. So they seem to be rated pretty accurate.
Was that bone stock? At what mileage? I'm assuming it was an '05.

Originally posted by cboman01+Jan 31 2005, 03:57 PM--></div><table border='0' align='center' width='95%' cellpadding='3' cellspacing='1'><tr><td>QUOTE (cboman01 @ Jan 31 2005, 03:57 PM)</td></tr><tr><td id='QUOTE'> <!--QuoteBegin-Rob@Jan 31 2005, 03:01 PM
One was dynoed over the weekend and came out at 346/351 to the wheels. At 15% loss, that's 398hp. So they seem to be rated pretty accurate.
Was that bone stock? At what mileage? I'm assuming it was an '05. [/b][/quote]
218 miles. Bone stock '05

Hey Rob sold my TTA and purchased a GTO also, I didnt realize you had bought one. Unitl I saw your post.
We have to hook up. Event,Track or Something....
Going to Dyno mine as soon as its hits 500 miles. I'am curious as hell.
My 98WS6 dyno'd at 307 stock @ 500 miles which you trapped that to 109 at MIR. Didnt dyno the TTA, which I regret.



Patrick

Originally posted by turbota@Feb 1 2005, 01:21 PM
Hey Rob sold my TTA and purchased a GTO also, I didnt realize you had bought one. Unitl I saw your post.
We have to hook up. Event,Track or Something....
Going to Dyno mine as soon as its hits 500 miles. I'am curious as hell.
My 98WS6 dyno'd at 307 stock @ 500 miles which you trapped that to 109 at MIR. Didnt dyno the TTA, which I regret.



Patrick
Small world.

I dynoed my TTA when it still was running all the stock stuff but very maxxed out. 318/455 at the wheels. Ran a 12.15@111 on a 1.69 back then. Never dynoed it after I started modding it.

Had the goat dynoed after I did the mods. 368/360 to the wheels. I'm just dying to hit the track. Maybe we can hook up at MIR after it opens. Seems to be a pretty good goat contingent around here.

Looking forward to seeing you again.

Originally posted by Rob@Jan 31 2005, 08:01 PM
One was dynoed over the weekend and came out at 346/351 to the wheels. At 15% loss, that's 398hp. So they seem to be rated pretty accurate.
Really minor point, but ....
398 HP - 15% loss would be 338 at the wheels, not 346.
407 HP - 15% loss would be 346 at the wheels.
413 HP - 15% loss would be 351 at the wheels.

Not sure how accurate the 15% estimate for loss really is so the best you can hope for is an estimate.... but if your hard number for the calc is "at 15% loss", the math doesn't come out.

Originally posted by goat kid+Feb 1 2005, 04:00 PM--></div><table border='0' align='center' width='95%' cellpadding='3' cellspacing='1'><tr><td>QUOTE (goat kid @ Feb 1 2005, 04:00 PM)</td></tr><tr><td id='QUOTE'> <!--QuoteBegin-Rob@Jan 31 2005, 08:01 PM
One was dynoed over the weekend and came out at 346/351 to the wheels.* At 15% loss, that's 398hp.* So they seem to be rated pretty accurate.
Really minor point, but ....
398 HP - 15% loss would be 338 at the wheels, not 346.
407 HP - 15% loss would be 346 at the wheels.
413 HP - 15% loss would be 351 at the wheels.

Not sure how accurate the 15% estimate for loss really is so the best you can hope for is an estimate.... but if your hard number for the calc is "at 15% loss", the math doesn't come out. [/b][/quote]
He was doing his math bass-ackwards 346*1.15=398

Looks like your over the 400hp already mark according to cboman01 calculations.Congrats!!!! Think you will hit the 12's with current mods?
What mods seem to be working the best for you?
All the Saturdays in March are Test & Tune hope to see you there!!!
Drop me a line when your going next patrickweeks@comcast.net

Patrick
Rob Let me know what car your buying next, so I can start saving now. LOL
WS6
TTA
GTO
?

No GK is right,

You can't do 346 * .15 becuase thats taking 15% of 346, to get the power at the wheels you need to take 15% of the engine HP. So using GK's 407, 407 *.15= 61.05. 407 - 61.05 = 345.95, or 346 roughly.

Originally posted by Nocturn@Feb 1 2005, 05:03 PM
No GK is right,

You can't do 346 * .15 becuase thats taking 15% of 346, to get the power at the wheels you need to take 15% of the engine HP. So using GK's 407, 407 *.15= 61.05. 407 - 61.05 = 345.95, or 346 roughly.
Right, that's what I was saying, just not explaining very well.

You guys do have the math worked out to determine how much there is at the flywheel if you assume a 15% loss. Seems to me the only number that matters is the 346, though. Just being cantankerous.

Pretty much how I feel... I could care less what the car is rated at the flywheel so long as it puts down as much as it can to the wheels.

Originally posted by turbota@Feb 1 2005, 04:43 PM
Looks like your over the 400hp already mark according to cboman01 calculations.Congrats!!!! Think you will hit the 12's with current mods?
What mods seem to be working the best for you?
All the Saturdays in March are Test & Tune hope to see you there!!!
Drop me a line when your going next patrickweeks@comcast.net

Patrick
Rob Let me know what car your buying next, so I can start saving now. LOL
WS6
TTA
GTO
?
Long tubes are probably the biggest gain you'll see as a bolt on. They really wake the car up. CAI is nice also. Getting it tuned is another biggie. Those should net you close to 340+rwhp.

I also noticed the pattern. Don't have a clue what I'll buy next. We'll hook up at MIR one of these days :)

I've read about stock 05 GTO's dynoing anywhere from 330 rwhp to 354+ rwhp. Thats a huge difference but we all know every dyno is different. I dynoed my 99Z28 on two different dyno's in my area. I got a pretty substantial difference between the 2 dynos. So you can't always assume one car is stronger than the another stictly by dyno numbers (unless each car was dynoed on the same dyno under similar conditions)

But it does seem that the 05 GTO is making around 400hp. The 04 is making around 350hp.
It was the LS1 Fbody's that were underrated at 305hp. They were basically making the same 350hp found in the 04 GTO.