Okay i read the above post, and am trying to answer these questions, so is it fair to say that my 99 z28 engine stock preduces 345 horses not the rated 305? and does the ss then produce how much if they are underrated engines? Or do the ls1's produce 345 horses but then are taimed by crappy intakes and exhaust to a 305 to the fly? please be gentle.

 

all ls1 98-02 basically the same (and yes i know ls6 on 01+ not that big a deal on stock motor)

all from 290-330 rwhp stock.... seen it so many times, no way to saw an exact #

and were all noobs one point in our lives
cory

 

Stock for stock, the motors are pretty much the same in power output. The newer ones ('01+) might tend to average a few extra hp more. The Z28 vs SS differences pretty much are contained to the exhaust. The Z28 vs the optional SLP SS dual/dual exhaust is kind of like adding a catback. People say the stock SS exhaust is better than the Z's, but my SS's stock muffler was just as heavy. So, I'm not so sure. The whole ram air thing is pretty much marketing. It might help deliver a little more cool air to the motor. But, once the car get's moving, a stock Z28 gets cold air too from behind the black 'catfish' grill. You just can't see it as easily. In the end, I'd say the biggest differentiator between an SS and Z28 is weight. 100lbs will make more of a difference than 5hp.

 

look at it this way...once you modify the hell out of it...

the only difference between the z28 and SS ...is looks...and even that is easily modified.


if you want a ramair setup...get a SSRA
if you want tighter suspension...get some 32/21mm sway bars

 

an LS1 is an LS1. The m6 cars dyno a bit more. The 01+ 3 or 4 more.

Not nothing to worry about.

 

The answer to your question is: The 305 is not correct unless you are referring to the possiblity of a 305 to the Rear wheels, which is in fact possible. I believe the mfgr. used 305 to convince you that the corvette had alot more hp---because gee it's a corvette.

Your 345 figure is what the mfgr. should have quoted, since that is closer to the actual front wheel numbers would be, given the RWHP numbers learned from the chassis dyno tests----bearing in mind that the mfgr never uses chassis dyno numbers.

I.e,. I believe you are looking at (2) different measurements, to wit: 305 to the rear wheels--as measured by a chasssis dyno, but 345 at the crank, as measured by an engine dyno with no drive train attached.

 

thats what i thought i was reading, that the 305 rating is pretty much to the wheels with these cars. I understand the whole losing power threw the drive drain ect, just trying to to get the numbers.
So can anyone fill in the blank.....

1999 Z28 would have something close to ________ rwhp.

1999 Z28 would have something around __________ hp at the flywheel.

 

300rwhp 350fwhp give or take

forget about the stock for stock argument. get a ls1, and mod it, end of story

 

Your Z would have 300RWHP. At the crank 345.

 

Manufacturers always quote net flywheel hp. 98-00 TAs, Formys, and Z28s were "rated" at 305 and 01-02s were "rated" at 310. Which as stated here were gross underratings to appease the 'vette guys.
Then the WS6 and SS cars were "rated" at 320-325. Then SLP and Berger got involved and muddied up the waters by adding a few boltons and removing the underrating and proclaiming 345 to 385 hp packages