Z/28 Stock HP - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

budkole` · 01-08-2015, 08:07 AM

Can anybody either confirm or deny that the ls7 is the z/28 actually makes more than 505 at the crank. I've seen dyno results indication that it's more like 545-550 hp. Anybody care to chime in?

MRREVINTO7 · 01-08-2015, 08:24 AM

445-455 rwhp is what I have seen ...So add roughly 67 hp to that for around 15% drive line loss so it's close so is around 505-520 crank hp ..LS7 would have to make like 480-490 rwhp in order to be around 550 crank hp I think that's a bit optimistic . .the LS3 IS in my eyes a over achiever in my book ..rated at 426 ..but my car layer down 395 rwhp stock with 330 miles in a 14 1LE trim then did a cam ..235/243 621-621 113 lsa and ARH long tubes and made 480 rwhp 430 tq......that's my take on it ...

MARKSTI · 01-08-2015, 10:45 AM

Seems like they put down the about/around the 505 hp as they claim...there is always alittle wiggle room for most any car tho.
Confirmed by a number of dynos and all the 1/4 trap speed data

silver surfer ZL1 · 01-08-2015, 05:17 PM

I had mine on the dyne last week in Dallas: (stock)

Mikebrinda · 01-08-2015, 09:55 PM

Makes sense to me every automaker undershoots the actual HP number, so the lawyer lawsuit machine does not get cranked up. Better to under-promise on HP numbers and over-deliver, than vice-versa.

*DGthe3* · 02-17-2015, 07:31 PM

Quote:

Originally Posted by Mikebrinda

Makes sense to me every automaker undershoots the actual HP number, so the lawyer lawsuit machine does not get cranked up. Better to under-promise on HP numbers and over-deliver, than vice-versa.

Except that there is very little margin to do that when you advertise as SAE certified (like GM does). I think the engines have to be within 2% of what is claimed. Thats 10 hp on 500 ... not a whole lot of wiggle room.

X25 · 02-17-2015, 07:59 PM

Z/28's engine power certification calls for 93 octane RON, unlike most other engines listed:

http://standards.sae.org/cpgm1_14ils7cam/

And here is the main list (click on engine tab):
http://www.sae.org/certifiedpower/data/

01-08-2015, 08:07 AM	#1
budkole` Drives: 2014 #405 Z/28 Join Date: Dec 2014 Location: St. Louis Posts: 24	Z/28 Stock HP Can anybody either confirm or deny that the ls7 is the z/28 actually makes more than 505 at the crank. I've seen dyno results indication that it's more like 545-550 hp. Anybody care to chime in?

01-08-2015, 05:17 PM	#4
silver surfer ZL1 Drives: 2013 silver ZL1 Join Date: Apr 2013 Location: colorado springs co Posts: 226	I had mine on the dyne last week in Dallas: (stock) __________________ 2015 Z28 Black #16 600rwhp N/A Colorado speed and performance build: hand ported heads, titanium valves, hand ported throttle body,fast lsxr intake, custom cut lunati cam, lunati push rods, fm high performance lifters, dual beehive springs + titanium retainers, trunnions upgrade, ARH headers + x pipe, fast fuel rails, c5r timing chain, katech high volume oil pump, ati underdrive pulley, Taylor wires. Sold---2013 ZL1 M6 Silver Ice Metallic: 767 rwhp Last edited by silver surfer ZL1; 01-08-2015 at 05:36 PM.

02-17-2015, 07:59 PM	#7
X25 Drives: '16 C7 Z51 Join Date: May 2012 Location: Redmond, WA Posts: 3,056	Z/28's engine power certification calls for 93 octane RON, unlike most other engines listed: http://standards.sae.org/cpgm1_14ils7cam/ And here is the main list (click on engine tab): http://www.sae.org/certifiedpower/data/ __________________ '16 Corvette C7 Z51 1LT (Build Thread) '14 AGM 1SS 1LE [COTW 11/17/14] (Build Thread) (SOLD) '13 Mazda MX-5 Club (Build Thread) '17 RAM 1500 Crew Cab 4x4 Night Edition '15 Nissan Rogue S AWD

01-08-2015, 08:24 AM	#2
MRREVINTO7 Drives: 14 1Le --14 chevy ss sedan 07shelby Join Date: Sep 2014 Location: ny Posts: 357	445-455 rwhp is what I have seen ...So add roughly 67 hp to that for around 15% drive line loss so it's close so is around 505-520 crank hp ..LS7 would have to make like 480-490 rwhp in order to be around 550 crank hp I think that's a bit optimistic . .the LS3 IS in my eyes a over achiever in my book ..rated at 426 ..but my car layer down 395 rwhp stock with 330 miles in a 14 1LE trim then did a cam ..235/243 621-621 113 lsa and ARH long tubes and made 480 rwhp 430 tq......that's my take on it ...

01-08-2015, 10:45 AM	#3
MARKSTI Drives: 2015 z28 sold Join Date: Dec 2014 Location: As Posts: 80	Seems like they put down the about/around the 505 hp as they claim...there is always alittle wiggle room for most any car tho. Confirmed by a number of dynos and all the 1/4 trap speed data

01-08-2015, 09:55 PM	#5
Mikebrinda Drives: Ferrari F430 Spider F1 Azzurro Arge Join Date: Sep 2013 Location: Irvine Posts: 858 View My Garage	Makes sense to me every automaker undershoots the actual HP number, so the lawyer lawsuit machine does not get cranked up. Better to under-promise on HP numbers and over-deliver, than vice-versa.