How much boost can I run on a 5.3l on pump gas?
12-08-2012, 10:31 PM
#1
Registered User
Thread Starter
Join Date: Dec 2012
Location: Grande prairie ab
Posts: 1
Likes: 0
Received 0 Likes
on
0 Posts
How much boost can I run on a 5.3l on pump gas?
Ive got an L33 engine that i want to build for as much boost as i can run on pump gas.. With low compression pistons, ported and polished heads and a stronger valvetrain what kind of boost could i run? And any suggestions on what components to use for this build?
This is my first LS engine build so any advice would be appreciated
This is my first LS engine build so any advice would be appreciated
12-09-2012, 10:37 AM
#5
Launching!
Join Date: Mar 2009
Location: Bolingbrook, illinois
Posts: 242
Likes: 0
Received 0 Likes
on
0 Posts
Theres an article on Truckin where they took a 150k mile 5.3, stock bottom end, cleaned the rings, gapped them a lot and put in a turbo friendly cam, some decent heads and 70 pulls at the max 23.9 pounds of boost. made 1300hp. they wanted to find the limit to boost, and they stopped because there was zero compression on the back cylinder. popped a valve cover off and a rocker just fell off the valve, like twisted, so they took the charge pipe off and the engine still ran with the broken rocker. over 70 pulls and they stopped at 23 pounds and it still ran. IIRC they used an air to water intercooler but im not sure they used meth. still trying to figure out why they obtained 500hp N.A with a cam, heads and LSXRT intake... but anyhoo max boost around 23 pounds got the 03 LM7 block 1300hp and 1100tq. read it yesterday. it made me wanna buy things.
12-09-2012, 01:38 PM
#6
Theres an article on Truckin where they took a 150k mile 5.3, stock bottom end, cleaned the rings, gapped them a lot and put in a turbo friendly cam, some decent heads and 70 pulls at the max 23.9 pounds of boost. made 1300hp. they wanted to find the limit to boost, and they stopped because there was zero compression on the back cylinder. popped a valve cover off and a rocker just fell off the valve, like twisted, so they took the charge pipe off and the engine still ran with the broken rocker. over 70 pulls and they stopped at 23 pounds and it still ran. IIRC they used an air to water intercooler but im not sure they used meth. still trying to figure out why they obtained 500hp N.A with a cam, heads and LSXRT intake... but anyhoo max boost around 23 pounds got the 03 LM7 block 1300hp and 1100tq. read it yesterday. it made me wanna buy things.
As for the boost level, I wouldn't personally run more than 11lbs (91 octane) on my daily driver 5.3l. The shorter stroke of the 4.8l helps those engines stay together longer.
Trending Topics
12-09-2012, 05:23 PM
#8
it runs pretty good on 16 psi too 
will be throwning in some good race gas next weekend, might turn it up a lil bit at the track.
and as far as being low compression, it does just fine out of boost.
will be throwning in some good race gas next weekend, might turn it up a lil bit at the track. and as far as being low compression, it does just fine out of boost.
