ShowtimeSteeleLS1SS

iTrader: (1)

Now im not agreeing with this article but here it is just found it!

Replacing the LT1 was GM’s all-new LS1, which had been introduced with the fifth-generation Corvette in 1997. It featured the same OHV design, but was cast in aluminum, reducing weight. While the engine had been "detuned" slightly with only single exhaust (which would split into two when it exited the underside of the car) the small number of changes between it and the Corvette version — as well as the real-world performance — make the 305hp rating that GM assigned it in the Z28 a rather conservative estimate. Dyno reports and performance figures support the notion that all LS1 cars, regardless of Chevrolet’s figures put out 345 hp.


The 2001 Z28 and SS models received the intake manifold from the LS6 (the engine used in the fifth-generation Corvette Z06.) Accordingly, the horsepower rating was increased to 310 for the Z28 and 325 for the SS, although both models remained underrated.



http://www.topspeed.com/cars/chevrol...3.html#index_1

I wish this was True!

EvoWake

iTrader: (8)

It might not be as true as they claim.. but the ls motors are under-rated

thunderstruck

iTrader: (15)

its been shown time and time again that ls1 camaro's/birds are underrated at 305 hp

ShowtimeSteeleLS1SS

iTrader: (1)

yeah i would like to believe that but 345? lol hey i aint complaining but what do you think it really is ? this is what my hunch/guess is ummmmm Z28 is prolly 315-320 and my ss is around 330-340 lol ha i wish! but i dunno prolly underated around 10hp prolly. what do you guys think

LS1W66

It is True
And this has been covered many times before.
In general other than intake and exhaust changes due to packaging constraints all LS1's make approx the same power.

MrDude_1

iTrader: (4)

it IS true...


remember 90% of the car world measures power at the crank.....



we all use rear wheel horsepower here... but outside of "ls1 world" flywheel power is the norm.

our stock cars cranking out 312ish at the rear wheels is 358 if you believe the generic 15% loss rule.. lol..... they are 345ish flywheel hp from the factory.

slt200mph

iTrader: (42)

The info you posted is very very old news sir .. ... But thanks for your effort ... GM has always liked to keep the Corvette owners egos intack so the Corvette motors where always rated higher on paper than the F body ... but I have seen on a number of occasions where a stock Corvette put down 10 less HP than a stock F body car on the same dyno ... of course this caused much dismay to the Corvette owner .. the reason being the independant rear suspension on the Vette eats up more energy getting the HP to the rear wheels than the straight axle on the F body .. 345-350 HP at the crank is a very realistic number for the LS1 motor .. but what you put on the ground is what is most important in the real world ...

ShowtimeSteeleLS1SS

iTrader: (1)

? so this was just posted at LS1.com this can be True?

Its pretty well known that the factory HP ratings are underrated. I have seen bone stock 2002 LS1 dyno at 323 RWHP which equates to around 370 at the motor.

lionelc-5

How is your SS any more than your Z28??? It is the same engine............

GuitsBoy

iTrader: (4)

Holy 1998, batman!

Yes, its true. And as the other guys said, Intake, exhaust and EGR provisions make for minute variations in power output between the models. That being said, the majority of LS1 powered cars with put down between 300 and 310 RWHP, regardless of the car its in. Thats right in line with 345 crank HP.

King James

iTrader: (13)

Weren't you the one in another thread trying to prove how different your precious SS was from a regular Z28?

ShowtimeSteeleLS1SS

iTrader: (1)

well i obviously new the ls1 responds well to bolt on s and easy mods, oh ok i understand what everyone means the "engine" itself has 345 hp but its just restricted from the intake and exhaust.

GuitsBoy

iTrader: (4)

Dont forget in order to meet requirements, both exhaust are fairly restrictive. I doubt youd see more than 5 or so HP difference due to exhaust between the z28 and a vette.

Intake and Exhaust are invariably the first place anyone starts modding, so essentially all LS1 hotrodders are starting on an even playing field in terms of HP. Weight and aerodynamics are another matter.

ShowtimeSteeleLS1SS

iTrader: (1)

and the article was stating i thought that the camaro z28 as it sat , was perfoming with this 345 withought and mods... thats all i was saying i obviously no the car can have 345 horse with headers,exhasut,inatake,lid there called mods but 345 as it sits stock

ShowtimeSteeleLS1SS

iTrader: (1)

ok i gotach i understand. once you start modding the ls1 in anything you on equal playing field but then the aero and weight as well s other factors come into play, yeah they were saying the corvettes rear susp eats alot of hp

GuitsBoy

iTrader: (4)

You, sir, are missing the difference between "Crank HP" and "Rear Wheel HP". On an engine dyno the LS1 may make 345 Crank HP. On a chassis dyno, the same motor may put down 305 RWHP. The tranny and drivetrain eats ~15% as a very loose rule of thumb.

ShowtimeSteeleLS1SS

iTrader: (1)

ok your right i got ahead of myself sorry everyone

GuitsBoy

iTrader: (4)

No apology necessary. Its very confusing. Manufacturers rate power at the crank. Most auto enthusiasts refer to RWHP. On this site, many people will simply state HP meaning RWHP.

ShowtimeSteeleLS1SS

iTrader: (1)

so what am i kick n at the rear like 290-295

RPM WS6

iTrader: (3)

I hate to break this to you, but your SS doesn't have any more power stock than a Z28 of the same year.

Yes, it's 100 true, SS = Z28 = SS when it come to factory power level. There is no difference in track times or dyno numbers.

The SS package is NOTHING more than appearance and some minor suspension differences. If you bought it because you thought it'd be quicker than a Z28, then you've been fooled by GM marketing.