The March 2007 edition of Modified Mag has the before/after test results for installing the GM Stage 2 kit on a stock SS/SC.

Without the Stage 2 kit, the car dyno'ed at 199.6 WHP and 177.3 ft/lbs torque

With the kit, the car dyno'ed at 223.8 WHP and 207 TQ

So, plus 24.2 WHP, plus 29.7 TQ with the Stage 2 kit. The kit demands premium fuel from that point forward, of course. There is a big improvement in the midrange of the hp/tq curves, where a lot of spirited driving occurs.

They then added to the system the K&N Typhoon Air Intake System to the car.

This added 11.4 WHP and 1.6 TQ at the high end of the curve. Results were much less in the midrange of the hp/tq curves...very slight improvement in the 3500 to 5000 rpm range. And that was after the stage 2 kit installed....

Of course, with the K&N filter/intake, they said the supercharger noise was now "pronounced"

This says a few things to me...one, is that if you really push the engine to the upper RPM range...that's roughly in excess of 5250 RPM's to redline...the K&N filter system will buy you a little power. (remember, that's on top of the Stage 2). Your downsides are a more intensive air filter cleaning cycle (which is a pain on the SS/SC). For some, more engine noise is a plus, for some a minus. In the midrange, it doesn't get you much at all...a sliver of improvement.

The stage 2 kit seems a pretty nice upgrade, causing a very nice jump in the midrange of the hp / tq curves.

I don't ever intend to "race" my car...I have some fun with it, but generally one always has to defer to traffic. Since the K&N kit only "gives" some benefit at the very high end of the RPM range, I don't think I will bother with it. Its only when the engine is pushed to its very max that the greater ability of the filter to pass air (and supercharger whine) is revealed. And that's only after a Stage 2 kit, with a modified supercharger pushing in more air to the engine.

I would imagine that an air intake modification alone does very little to improve hp/tq, and even then it is only at the very high end of the RPM range.

However, the nice jump the stage 2 kit gives in the RPM range I tend to use the most....3000 to 5500 RPM's...makes me much more interested in the kit....no wonder everyone says the car "feels" different...

 

with the kit, the car dyno'd at 223.8 WHP and 207 TQ


thought you guys were claiming this bone stock

 

Not sure of what you are asking. MY car is still stock. I am reporting the results in a magazine they saw on a dyno for a stock SS/SC before/after the install of a Stage 2 kit.

If you are commenting on the factory published specs from GM on a stock SS/SC, I suspect those are not WHP, but engine HP numbers.

its on pg 126 of the March 2007 ed of Modified Mag.

 

Does it mention what kind of dyno it was? It seems most 220 whp stock figures are off a dynojet.

 

It looks like Mustang dyno type numbers.

 

Mine dyno'ed at 218 stock. and stage 2s are getting 240 something. I guess its all where you are at.

 

Depends on a lot of things... type of dyno... temperature... heat-soak.

But yes... most dynos I've seen are between 210 & 220 stock... and 240+ with Stage 2 and bolt-ons. The dyno they used must have been really conservitave.

 

But look what there baseline was. The GAINS are what count. All dynos will read a little bit different.

 

I put down 230.1 whp with just a K&N intake on a mustang dyno.

 

Nice. The numbers are typically lower on the Mustang dyno. You should throw it on a dynojet and see if what the difference is.

 

That is some mad HP

 

Exactly. People look at dyno reads like they are the absolute numbers for the car, but they are only intended to be used to show gains when you use the exact same dyno for every pull.

Assuming a 12%-15% drivetrain loss, the base pull was 227-235 at the crank, and stage 2 was 254-263 at the crank. Those are still higher numbers than GM has rated.

 

The dynomometer was a Dynojet one. It was done by TAG Racecraft Inc, ph 905-845-0888, www.tagracecraft.com

 

woo hoo for factory freaks

 

some low #'s

 

Thats why I thought it was a Mustang dyno.

 

you should have pushed more lol I know Perry would love it. I have been helping the owner install the parts that they have been getting from Modified and he told me after putting the header and the cat back exhaust they didn't really improve much. the Stage 2 felt great though I really enjoyed bombing around his office with his car.

 

Where did u guys get a March issue??
I was just on there website and talks 0 about the march issue?? Is it out and they havent updated their websites?

And ppl should deff stop looking at final#'s... WAY to many factors can influence that. Look at gains and remember that everything does play a factor, so dyno's like everything else have to be taken with a grain of salt

 

I managed to get a subscription for next to nothing due to some internet deal...it arrived in the mail.

 

OMFG who the hell cares what the *** u dynoed.. look at the baseline.. look at the gains.. every cobalt ss/sc comes with, +/- a few, the same horsepower & torque to the wheels... its the same pulley, same intake and exhaust, same tune, etc....

i made 238whp on a mustang dyno 2 weeks ago.. congradu-fuking-lations.. i was running crazy boost, more than 14lbs.. n all i have is the airbox mod.. so am i gonna say whats up with those #'s? my car must be faster?? NO bc that dyno reads lower.. look at those gainss.. 11.4whp on top of the stage 2 gain for the K&N intake is spectacular...

everytime dyno#'s are posted it becomes a pissing match on why some are lower and some are higher.. more and more its becoming prevalent that common car knowledge is lacking on this forum

regardless.. 35whp and 30ft-lbs is damn good gains for about $600 thats like a 20% gain or something