Supercharging an LT4?
Melting Slicks
Joined: Mar 2002
Posts: 2,526
Likes: 104
From: Stafford Va
What would I be looking at for HP gains? I have a LT4/ hot cam, headers and side pipes and running an OBD1 reprogramed computer. Its in a 64 Corvette GS. I am thinking it may not be worth the investment???? Thanks
Instructor
Joined: Dec 2005
Posts: 197
Likes: 0
From: Woodland California
supercharged LT4 experience
Originally Posted by Zix
Are you speaking from experience?! 
But you'd have to admit, once it's done it's worth the effort!
But you'd have to admit, once it's done it's worth the effort!
Melting Slicks
Joined: Dec 2001
Posts: 2,437
Likes: 1
From: Gainesville Fl
i know im new at forced induction but what is alky injection? is it part of an intercooling device for a blower? i looked at hte packages for the LT4 on his website and those are some impressive numbers. im assuming most of those are with forged pistons and reduced compression ect to run about 12lbs of boost but is that on a stock displacement? 349ci?
Melting Slicks
Joined: Dec 2000
Posts: 2,719
Likes: 60
From: Fremont Oh
Alky / water injection is added at high pressure about 100psi through a nozzle in the intake to cool the intake air coming into the engine, typically it is good for another 75 or so horsepower...
It is used either alone or in place of a air / air ntercooler... or both together, depending on what you are doing...
Most of the numbers you are seeing are from lt1 350's there are a few runing 383's and fewer 396's about the are supercharged...
Mo
It is used either alone or in place of a air / air ntercooler... or both together, depending on what you are doing...
Most of the numbers you are seeing are from lt1 350's there are a few runing 383's and fewer 396's about the are supercharged...
Mo
Melting Slicks
Joined: Dec 2001
Posts: 2,437
Likes: 1
From: Gainesville Fl
Originally Posted by Mo_Bandy
Alky / water injection is added at high pressure about 100psi through a nozzle in the intake to cool the intake air coming into the engine, typically it is good for another 75 or so horsepower...
It is used either alone or in place of a air / air ntercooler... or both together, depending on what you are doing...
Most of the numbers you are seeing are from lt1 350's there are a few runing 383's and fewer 396's about the are supercharged...
Mo
It is used either alone or in place of a air / air ntercooler... or both together, depending on what you are doing...
Most of the numbers you are seeing are from lt1 350's there are a few runing 383's and fewer 396's about the are supercharged...
Mo
Melting Slicks
Joined: Dec 2001
Posts: 2,437
Likes: 1
From: Gainesville Fl
Originally Posted by Mo_Bandy
no, it really is dependant on how hot the incoming air is enterng the intake, it is not like a shot of NOS...
The 75 hP is roughly the gains I saw..
Mo
The 75 hP is roughly the gains I saw..
Mo
im sorry. i wasnt talking about alky injection. i meant if most of these guys are using kits from blowerowrks on stock discplacement motors and getting close to 600rwhp i should be able to get quite a bit more with a 396 motor
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Cruising
Joined: Mar 2006
Posts: 10
Likes: 0
From: Clemson sc
Originally Posted by vstol
thanks when the time comes $$ will go into a rebuild and not supercharging my LT4.
Advanced
Joined: Feb 2006
Posts: 62
Likes: 2
From: Denver CO
IMHO the LT4 is built around old school normally aspirated HP hence the high compression ratio. For the cost of a supercharger, comp ratios changes, or a high dollar blower with low boost which defeats the purpose of the blower in the first place, you may be disappointed. You can build a reliable very quick car working with the platform you already have such as performance tires or drag radials, driving skill, a good clutch, sensible engine mods, programming etc.
If you must blow, leave the LT4 alone. Find an LT1 engine which is cheaper and more plentiful than the LT4. Take your time and build the engine on a stand for the boost you want. When done, swap your blower built LT1 where your LT4 used to live. Obviously pcm changes/programing will be required.
If you must blow, leave the LT4 alone. Find an LT1 engine which is cheaper and more plentiful than the LT4. Take your time and build the engine on a stand for the boost you want. When done, swap your blower built LT1 where your LT4 used to live. Obviously pcm changes/programing will be required.
Instructor
Joined: Dec 2005
Posts: 156
Likes: 0
From: vancouver bc
bad tune or too much pwr kills ....but i do agree that too high of a compression make things tricky but it can be done.
alky injection is old school but it works ..if its not a daily driver nitrous works great on air inlet temps...
alky injection is old school but it works ..if its not a daily driver nitrous works great on air inlet temps...
