How Much Boost?
Thread Starter
Staging Lane
iTrader: (1)
Joined: Jun 2012
Posts: 50
Likes: 0
From: Vancouver, BC, Canada
How Much Boost? How many pounds of boost will a stock lt1 handle before something gives? Will it handle 7lbs reliably? 8lbs? Has anyone tried running bost on a stock engine? The boost will be supplied by a garret t3 turbo.
If I were to try 8psi it would definitely be intercooled as well as possible and I would consider alky too.
I would also have a plan for how to deal with the carnage should something go wrong.
You do understand boost is more or less a measure of how much air is NOT getting into the engine right, bit of an oversimplification but........? You put a cam in it to free up the induction and the boost number can go down while the power number goes up. Not saying that will make it more reliable.
I would at least give it some LT4 springs to keep the valves under control.
You understand a decent heads/cam car will hand you your *** if you are just putting boost to an otherwise completely stock engine on pumpgas right? I am not saying don't do it, if you want the extra power with perfectly stock manners this will get you a boost in power without the raised idle, higher peak rpm, stall and gearing etc a heads/cam setup would need.
I would also have a plan for how to deal with the carnage should something go wrong.
You do understand boost is more or less a measure of how much air is NOT getting into the engine right, bit of an oversimplification but........? You put a cam in it to free up the induction and the boost number can go down while the power number goes up. Not saying that will make it more reliable.
I would at least give it some LT4 springs to keep the valves under control.
You understand a decent heads/cam car will hand you your *** if you are just putting boost to an otherwise completely stock engine on pumpgas right? I am not saying don't do it, if you want the extra power with perfectly stock manners this will get you a boost in power without the raised idle, higher peak rpm, stall and gearing etc a heads/cam setup would need.
Trending Topics
For 99% of LT1 NA setups, you won't find the limits.
For a boosted application, I don't know, out of my experience. You just have to consider you're running a richer A/F ratio AND sucking up power you don't even see just to drive the blower, so it won't be as high as an NA or nitrous setup. I'd expect somewhere in the 700's net crank.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
Five Reasons the Camaro Was the Most Pivotal Player in the Pony Car Wars 2.0
Brett Foote
10 Reasons the LS7 Is GM's Most Extreme Naturally Aspirated V8 Engine Ever
Verdad Gallardo For a well tuned setup that runs efficiently NA, plus a moderate ~200 shot on top of it, the stock lines and rails will support at least 850 crank hp, from the setups I've been around. Some say more, but I can't vouch for that.
For 99% of LT1 NA setups, you won't find the limits.
For a boosted application, I don't know, out of my experience. You just have to consider you're running a richer A/F ratio AND sucking up power you don't even see just to drive the blower, so it won't be as high as an NA or nitrous setup. I'd expect somewhere in the 700's net crank.
For 99% of LT1 NA setups, you won't find the limits.
For a boosted application, I don't know, out of my experience. You just have to consider you're running a richer A/F ratio AND sucking up power you don't even see just to drive the blower, so it won't be as high as an NA or nitrous setup. I'd expect somewhere in the 700's net crank.
i think that pounds of boost that a stock engine will take is kind of vague statement now as a supercharger guy i personally have seen a alot of guys run 8# w either a p600 or a p1 but guys that have tryed wiith a d1 have have failed within a month but u are not talking apples to apples so i dont know much abt the volume sizes of turbos but i would b curious to know the size of the turbo used where 7# caused faused failure was there fuel issues were they running a rich (safer) tune or were they pushing it. i know in the FI section they have a failure chart maybe look at that and make a informed decision that i personallly think wo knowing the individual tune ur just guessing.
Thread Starter
Staging Lane
iTrader: (1)
Joined: Jun 2012
Posts: 50
Likes: 0
From: Vancouver, BC, Canada
Thanks Guys, helps alot. I guess where I go from here is to get the build started. If it lets go ill just have an excuse to upgrade 
. Ill make sure to run a safe tune and timing will be kept under control aswell. If it holds for a long time then its just a testament to these engines and when i have a replacement ready to go ill throw more t it till it goes. 
Thanks again
. Ill make sure to run a safe tune and timing will be kept under control aswell. If it holds for a long time then its just a testament to these engines and when i have a replacement ready to go ill throw more t it till it goes. Thanks again One difference between boost from a turbo vs a blower is a turbo is backing up the exhaust building heat, where the nice headers and free exhaust of a supercharger let the heat escape more easily.
The heat held in the chamber by a turbo could easily be the deciding factor far as why say a blower gets away with 8psi but a turbo might only be OK at 6psi
The heat held in the chamber by a turbo could easily be the deciding factor far as why say a blower gets away with 8psi but a turbo might only be OK at 6psi
One difference between boost from a turbo vs a blower is a turbo is backing up the exhaust building heat, where the nice headers and free exhaust of a supercharger let the heat escape more easily.
The heat held in the chamber by a turbo could easily be the deciding factor far as why say a blower gets away with 8psi but a turbo might only be OK at 6psi
The heat held in the chamber by a turbo could easily be the deciding factor far as why say a blower gets away with 8psi but a turbo might only be OK at 6psi
...which brings us back to the point that one really should be shooting for a hp level and not a boost level
Thanks for the info guys it is most helpful, I'll check the FI page for the chart. The reason I'm asking is because I may go twin turbo over the winter and was wondering if I needed to add fuel lines and rails to the budget. I have a pair of Turbonetics 62-1 Q trim .96 a/r turbos from another project that are just sitting around so I thought I'd look at using them since they're paid for already. I should be able to make ~ 850 - 900 rwhp with them, I already have a built engine but I'll either be swapping pistons to lower my scr or buying a set of AFR 210's with the 65cc combustion chambers to lower the scr.
i m not quite sure on octane i think a/f ratio is the important factor im sure it wld help.I was always told 7-8 lbs was a tolerable amnt of boost for a stock bottom end. WITH a small supercharger i.e. p600 or a p1. But a safe tune goes a long ways towards saving ur bottom end.
Teching In
Joined: Nov 2010
Posts: 14
Likes: 0
Thanks thats what I was thinking. I Have a forged piston shortblock waiting just wanted a starting point before I swapped. Talked to a tuner he was telling me 10lbs would be safe but i questioned that. Madtuner is local to me I think Ill be calling him after first of year.
TECH Fanatic
Joined: Nov 2008
Posts: 1,776
Likes: 1
From: South Dakota
There both going to have heat. Superchager is going to heat the heck out of your intake