How much boost can a stock 5.3 take. What kind of rpms do you spin and what kind of timing are you running under boost. Im running 8 pounds and 16 degrees and shifting at 5200
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How much boost can a stock 5.3 take. What kind of rpms do you spin and what kind of timing are you running under boost. Im running 8 pounds and 16 degrees and shifting at 5200
It can take all of the boost...j/k. They can take quite a lot, but I personally wouldn't run any higher than what your map sensor can read. The amount of timing is going to vary greatly depending on fuel, plugs, intercooler setup, type of boost, level of boost, etc. Shift rpm is also going to vary depending on cam/valve train, application and power curve. That being said why are you shifting so early? You should be able to push that back about 1k rpm.Quote:
Originally Posted by WACHS1981
I've seen 18-20 psi on the internet, somewhere around 700-800whp. At that point you are just waiting for the rods to bend lol.
The fastest stock bottom end 5.3 is running 4s in the 1/8th at 40 psi on methanol haha
https://sites.google.com/site/sloppywiki/
he even has the tunes on there for ya to look at
http://www.hotrod.com/how-to/engine/...g-bang-theory/
Read the whole thing... end is great.
Gen3 LM7 very happy at 12PSI.
90 Octane Unleaded limits my spark : 11 degrees up high, dipping to 8 degrees between 4000-4400 rpm.
I have Just started spraying 6 gph 70% methanol a couple days ago, might be able to get more spark advance.
good job replying to a 10 year old thread...Quote:
Originally Posted by Fullpower
Damn your Alaska smoke signal internet, lol. You just resurrected a thread from 10 years ago.Quote:
Originally Posted by Fullpower
10 years? Feels like just yesterday lol
Kind of makes me feel old as dirt when I realize this forum has members who were not yet born when I joined.Quote:
Originally Posted by horsepowerguru427
Since we are on this. 250K mile stock LM7 in a 2003 Avalanche. 12 psi from an intercooled Torque Storm at 5,800 rpm. 16 total timing until the IATs heat up over 110F and AFR is high 10s/low 11s until it gets over 8 psi at which point I richen it up into the low-mid 10s. Remember it has no added ring gap and added fueling helps reduce the heat. 2nd gear WOT in 100F ambients, IATs reach 140F and timing is down to 13.5. Oh yea it has a stock rebuild of the 4L60E a few years ago too. What can go wrong with this one, lol. My buddy is FULL SEND with stuff too. He full sent it with a nearly empty tank of fuel, starved the fuel rail and had it misfire heavily under boost. It survived.
Agreed! I graduated high school in the same year you joined. Been doing this stuff longer than some of my customers now have been alive. My vehicle in high school had a SBC with a Q-Jet/HEI on it.Quote:
Originally Posted by gametech
Is it turbocharged, centrifigual, or turbo? Do you have 12 psi at 4,000-4,400? The one I tuned is like 6-7 psi in that RPM range with the intercooled Torque Storm on it and wants more like 18-19* there.Quote:
Originally Posted by Fullpower
I've ran as much as 18 PSI through numerous stock bottom end and 100% stock internal engines. I've had many last years at 15 PSI on pump gas, 93-94 around here.
Just gotta run em fat and keep the timing low enough and hope for the best LOL.
Class of 06...I feel you, man. quadrajet was the first carb i ever rebuilt. They run good, whenever they run good...Quote:
Originally Posted by Fast4.7