Dante93GTZ

iTrader: (5)

I was originally thinking abou the ZZ4 with some forced induction, but I'm not so sure after seeing Overhaulin' last night.

They only made like 350hp WITH the ZZ4 WITH a Vortec SC setup... WITH A CARB. I was pretty dissappointed with those numbers...

Isn't the ZZ4 crate motor rated at like 400hp NA with just a carb?

I can see some loss thru the tranny, but geez...

DauntlessZ28

That's all? The ZZ-4 is supposed to come with 355hp and 405 ft/lbs of torque. How much boost were they running? I'm wondering if they set the boost setting WAY too low, so the power made from boost was barely enough to compensate for the parasitic loss. Something doesn't sound right.

1982z28

they said 7 psi. they also said it should be good for about 150hp gain???????????? (it didnt add up to me either)

Dante93GTZ

iTrader: (5)

Yeah, 7psi was correct. I too heard the 150hp more statement, although if that's correct, they must think the ZZ4 only has 200hp.

The whole combo didn't sound right.

25THRSS

That was rear wheel hp and no intercooler, so it should be about right. That's almost 450 flywheel hp.

Dustin Mustangs

iTrader: (1)

I thought that was pretty weak too. Everything they got from the supercharger and a little more was lost through the driveline. I think the funniest part is that a team of vortec employees were the ones that hooked it up on the show and got these terrible numbers.

Dante93GTZ

iTrader: (5)

Are you serious? 100hp loss thru the drivetrain?? WTF?

nightrider87

yeah those numbers don't seem that off. figure a 15% to 20% drivetrain loss and ideal numbers here

so 350hp ZZ4 stock flywheel

blower hp at flywheel in a fairly ideal situation would be at lets say 80% VE so .80 X 7psi/14.7psi X NA HP = 133hp gain from blower

total output is at 483 flyhweel - the 20% loss = 387

now it was a vortech, so no INTERCOOLER so even though the VE is possible the actually efficieny of the system will be lower than that.

350 at the wheels seems just fine.

Dustin Mustangs

iTrader: (1)

Vortec advertises an average of 46% more horsepower from their SC's on their website. That works out to 415 rear wheel for the ZZ4. A comparable engine (sorta) is the LS1, both make around 350 hp stock. They advertise 494 crank hp with their kit for this engine. That works out to 395 at the wheels. I realize this is apples and oranges here, but they both displace the same and make the same hp, ie very comparable VE's. All these numbers are assuming 20% loss, which is in my opinion more than you should ever see with all things working properly.

The bottom line is the guys from vortec did a crappy job on national tv. How crappy is up to debate, but if it where my company I would have come in above my claimed average increase in power no matter what it took. Trust me, the last thing they were trying to inspire by being on that show was a thread in a forum like this.

Once again I say !

nightrider87

you'll have to post where they make the claim about the LS1. You are right that it should be simliar but still... their claims are bogus or you aren't comparing the right numbers here. the LS1 kit is only rated at 7psi to get nearly 500 crank hp with no intercooler?

Dustin Mustangs

iTrader: (1)

http://www.vortechsuperchargers.com/.../appguide.html

I was looking specifically at the kit for the C5 becasue of the similarities it has with the ZZ4.

nightrider87

I don't think you can use the vette kit, if only because I think it has an intercooler

the Fbody LS1 kit has with and without and intercooler

without: 418/414
with: 470/462

the vette just has one listed and its:494/473

the difference between the fbody LS1 with intercooler and the vette is about the power output difference of the stock engines... you'll aslso notice the vette kit is 7000...so it deffinately better come with an intercooler for that price.

so take the 418 of the fbody with no intercooler, add 20hp for the zz4 and you're at about 450... 20% loss of 90hp and we're right about where the vortec came out on the show. i know that's running at 1 psi less than the 7psi on the show but all things considered, it didn't perform badly at all.


you can do the same using the escalade 6.0L. stock is 345/380, that's pretty much a zz4 right there. the kit for it only comes with an intercooler and they bump it up to 465/494 on 7-8lbs boost. no intercooler yields lower numbers and we've matched what they got again.

I realize you can't really go exactly back and forth because they are different engines, different setups etc...but these somewhat real world numbers can be used as a benchmark fairly well i would have to say.