My 454 LSX NA Build
03-07-2009, 09:55 PM
#44
TECH Enthusiast
iTrader: (19)
Join Date: Dec 2001
Location: deam land
Posts: 623
Likes: 0
Received 0 Likes
on
0 Posts
I'll post it when I ge it. And yes, I'm skeptical too. But after looking at everything its certainly possible. And the guys in Australia that told you that you should have made 650 RWHP, they're correct. They've been doing this for 5 years now, they past the 600 RWHP mark 5 years ago with nice tunes and nice idles. The ITB's are the key to the power.
But you do know there's something really wrong with your 427ci. That Harrop, when tuned properly and improperly can have huge hp ranges. Not saying that's what was up with yours, just saying.
My 427ci is 7 years old, uses a ported LS6 intake, ported LS6 heads and a stock ported TB. 11.3:1 cr and an auto tranny 4L60E. Cam is only 244/244 .610/.610 114 lsa.
I make 490 RWHP with no cats through a full exhuast. Idles like a baby.
Made 487 RWHP on a different dyno about 1 year later.
On the other hand, I know at least 10 guys with C6 Z06's (427ci) who are in the 580-610 RWHP range after head porting, cam upgrades, exhaust upgrades and a tune. M6 of course. The guys who made upowards of 610 RWHP have pretty nice cams, but definitely not as big as yours was. If these guys throw a Harrop on there with a good tune they will make another 60 RWHP. E85 and bump up the compression, and there's more power. Put a huge cam in also like you and the 454ci guy has, more power, and on top of that the 454ci guy has 27 more cubes, when in a properly built engine is good for another 32 hp right there. That does all equal up to right about 750 RWHP.
Plus, he has a mid engine set-up and that tranny he's using has minimal drivetrain loss.
He is flying to my town to tune my 454ci with the Harrop, we'll see what he does with mine. Its a 4L80E so obviously I won't get near 750 RWHP, but I'm confident I'll be at 650-680 RWHP or more. But I have to wait for the new Edelbrock heads from WCCH, whenever they are ready for shipping anyway. I'm also going E85 or race gas and high compression.
But you do know there's something really wrong with your 427ci. That Harrop, when tuned properly and improperly can have huge hp ranges. Not saying that's what was up with yours, just saying.
My 427ci is 7 years old, uses a ported LS6 intake, ported LS6 heads and a stock ported TB. 11.3:1 cr and an auto tranny 4L60E. Cam is only 244/244 .610/.610 114 lsa.
I make 490 RWHP with no cats through a full exhuast. Idles like a baby.
Made 487 RWHP on a different dyno about 1 year later.
On the other hand, I know at least 10 guys with C6 Z06's (427ci) who are in the 580-610 RWHP range after head porting, cam upgrades, exhaust upgrades and a tune. M6 of course. The guys who made upowards of 610 RWHP have pretty nice cams, but definitely not as big as yours was. If these guys throw a Harrop on there with a good tune they will make another 60 RWHP. E85 and bump up the compression, and there's more power. Put a huge cam in also like you and the 454ci guy has, more power, and on top of that the 454ci guy has 27 more cubes, when in a properly built engine is good for another 32 hp right there. That does all equal up to right about 750 RWHP.
Plus, he has a mid engine set-up and that tranny he's using has minimal drivetrain loss.
He is flying to my town to tune my 454ci with the Harrop, we'll see what he does with mine. Its a 4L80E so obviously I won't get near 750 RWHP, but I'm confident I'll be at 650-680 RWHP or more. But I have to wait for the new Edelbrock heads from WCCH, whenever they are ready for shipping anyway. I'm also going E85 or race gas and high compression.
03-08-2009, 07:46 PM
#51
TECH Regular
iTrader: (38)
Join Date: Sep 2008
Location: edmond, ok
Posts: 498
Likes: 0
Received 0 Likes
on
0 Posts
Goodluck on your setup, i have a mild build 454 LSX, TEA ported 317's, ported and shaved Fast 90, the cam is just 254/256 595/595 at 112+2. With a Y=and SLP Dual Dual. Made 550/536.
03-08-2009, 10:57 PM
#52
TECH Fanatic
Thread Starter
iTrader: (13)
Join Date: Jan 2009
Location: Fenton, MI
Posts: 1,644
Likes: 0
Received 0 Likes
on
0 Posts
Thanks supercobra. Im having fun with this build. Just looking to have a beautiful car i can take to shows, drive everyday, yes even when it rains, and run respectable times in. low 10's i hope.
Im looking for everything basically, not too many comprimises so far.
Im looking for everything basically, not too many comprimises so far.
