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How much boost can a 4.3 handle

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Old 01-20-2009, 12:35 AM   #1
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How much boost can a 4.3 handle

i am wanting to supercharge my 98 ss and kinda wonderin how many psi the stock 4.3 vortec can take?
Old 01-20-2009, 09:47 AM   #2
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Re: How much boost can a 4.3 handle

i think is 6lbs or 8lbs but don't quote me on that
Old 01-20-2009, 09:58 AM   #3
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Re: How much boost can a 4.3 handle

yea im interested in this to..
Old 01-20-2009, 10:02 AM   #4
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Re: How much boost can a 4.3 handle

The limitation is getting the supercharger to hold together, not the engine. You can pretty easily run 15-20 PSI on the engine.
Old 01-20-2009, 12:57 PM   #5
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Re: How much boost can a 4.3 handle

Quote: Originally Posted by King_Ice_Flash2
The limitation is getting the supercharger to hold together, not the engine. You can pretty easily run 15-20 PSI on the engine.

That seems alittle high for a stock motor!
Old 01-20-2009, 02:33 PM   #6
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Re: How much boost can a 4.3 handle

Try reading some of the posts in the "BLOWERS AND BOTTLES" section. Some members have run more than 20 on a stock engine, and it lasted quite a long time.
Old 01-22-2009, 04:05 AM   #7
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Re: How much boost can a 4.3 handle

Quote: Originally Posted by King_Ice_Flash2
Try reading some of the posts in the "BLOWERS AND BOTTLES" section. Some members have run more than 20 on a stock engine, and it lasted quite a long time.
What kind of fuel managment are they running cause i plan on running the stock ecu?
Old 01-22-2009, 09:53 AM   #8
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Re: How much boost can a 4.3 handle

What are you driving?
Old 01-23-2009, 04:22 AM   #9
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Re: How much boost can a 4.3 handle

Quote: Originally Posted by King_Ice_Flash2
What are you driving?
A 98 s10 ss sir............
what are you driving???????????
Old 01-23-2009, 10:00 AM   #10
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Re: How much boost can a 4.3 handle

I would seriously consider upgrading to the 2001-2002 PCM if you are doing forced induction and keep the stock PCM. There is a lot more available tuning packages for the LS1 PCM than the Vortec controller, and there are a lot more options to tweak inside of the PCM.

Take a look through here should give you a pretty good idea what is involved:
http://www.pacificp.com/forum/viewtopic.php?t=3240

Me, I have a 2003 4.3L S10 long bed pickup in various states of disassembly for my turbo project.
Old 01-23-2009, 04:45 PM   #11
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Re: How much boost can a 4.3 handle

if your confident in your tuning skills and have the time to spend to get the tune perfect, then i wouldnt hesitate to running 20 or so psi

if your using an fmu or a mail order tune, or basically not to confident in the tune i wouldnt run more then 10 or so

i ran mine at 23 to 25 psi for quite some time on a bone stock short block. i invested many hours tuning it though
Old 01-26-2009, 01:21 AM   #12
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Re: How much boost can a 4.3 handle

Quote: Originally Posted by King_Ice_Flash2
I would seriously consider upgrading to the 2001-2002 PCM if you are doing forced induction and keep the stock PCM. There is a lot more available tuning packages for the LS1 PCM than the Vortec controller, and there are a lot more options to tweak inside of the PCM.

Take a look through here should give you a pretty good idea what is involved:
http://www.pacificp.com/forum/viewtopic.php?t=3240

Me, I have a 2003 4.3L S10 long bed pickup in various states of disassembly for my turbo project.
so just getting an ls1 pcm would be better than just sending my stock one in and getting it remapped?
Old 01-26-2009, 08:35 AM   #13
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Re: How much boost can a 4.3 handle

You will still have to get a custom tune done, but finding someone to do it will be a lot easier.
Old 01-28-2009, 10:28 AM   #14
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Re: How much boost can a 4.3 handle

You're lookin at alot of possibilities with getting supercharger on a stock motor, from the manufacturer, vehicles with superchargers are well thought out as far as cams and camshafts, air fuel mixture, and things like that go. Just slapping one on and expecting performance might hurt your feelings.

Last edited by redchief31; 01-28-2009 at 10:29 AM.
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