Kyle89

What is the highest these gen iv motors are good to rev up to and push power wise. truck is always on the dyno in our shop for tuning on hptuners.

billet wheel upgraded d1sc 3.8" pulley
gates green belt hd
dual core fmic 3" ic piping
tial 50mm bov -2psi spring
gm iat
gm 3 bar map from cruze turbo
60lbs deka injectors
pac 660 dual springs
chromoly push rod
ls7 lifters
dod delete
vvt delete
comp custom grind cam 227in/239ex @50 .619in .600ex 115lsa
hd timing chain
lc9 timing chain tensioner
arp headstuds
ls9 headgaskets
texas speed 1 3/4" long tubes and y pipe
3" stainless exhaust no cats magnaflow race muffler straight through
truck is factory flex fuel so using stock fuel pump


o yeah The motor is a LC9 aluminum block and i also have a alky injection system thats not hooked up but may be. (i dont want to rely on meth for detonation)

i have the blower pulley'd up so its no were near its max rpm range yet. what do you guys think i can really push this truck to on the stock bottom end rpm and power/torque wise either on 93 and meth (when i have it turned on to beat the truck up), or on straight e85. not sure how i feel about e85 and meth mixed. please chime in and lmk your opinions.

Thanks guys and girls

Vortec350ss

iTrader: (20)

I wouldnt want to go much past 6700 RPM with it.

Thats a big boy cam for a 5.3! Given the rpm constraints you probably could have made a more meaty curve with a tighter LSA. Id like to see that cam on a 112 or 113+4.

Kyle89

That can all motor made the 5.3 pick up almost 50hp. It's setup for the blower/ turbo the truck will have a t kit on it after the testing on the d1sc i already built a kit for that too. I know that cam is a good bit for the 5.3 would've been great on a 6.0 or 5.7 but gonna push it hard so what can be gotten out of it. What is the max power you have seen out of a stock bottom end ? I've seen guys do 1000 idk how long for though but reliably with spot on tune 5-600whp should be fine no ?

Vortec350ss

iTrader: (20)

Oh yea you'll be fine at 600 at the tires without a doubt.

With a blower that power limit is less defined, but guys with turbos have made close to 1000, yes. Help us find out!

Kyle89

Sweet i figured that's a good spot to goal for on low boost with the blower on the stock fuel pump. Haven't seen anyone complains of the flex fuel truck pumps yet have u experienced anything with them yet

Kyle89

Do you know what boost pressure the turbo guys are putting on the Gen IV 5.3 bottom ends ? Piston rings rods are what i question the crank and block not so much

Vortec350ss

iTrader: (20)

20psi and more...

Kyle89

Wait you have seen or some yourself 20psi ish on a stock rod piston Gen IV 5.3? I can't imagine them taking that much cylinder pressure. A lot is the tune i know that's the heart but dang good amount

Vortec350ss

iTrader: (20)

I have seen iron block strong rod 6.0's taking that boost. Not sure about alum blocks... but guys always push it further than you would think they can.

FFDP

iTrader: (2)

Of several of the guys on here and several reputable video's on youtube, many people have pushed well over 800-1000rwhp on stock connection rods without them bending or breaking. The stronger H-beam rods are no joke.