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supercharging a 3.8

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dirtybird

Post subject: supercharging a 3.8

Posted: Tue Jan 14, 2014 10:23 am

LE Member

Joined: Tue Jan 14, 2014 10:19 am
Posts: 5
Year and Trim: 1997 Pontiac firebird 3.8 base

are a 3.8 heads different for a supercharged and non-supercharged engine? if so, what are the differences?

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MattStrike

Post subject: Re: supercharging a 3.8

Posted: Tue Jan 14, 2014 11:49 am

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Yes. The fuel injectors are in the heads on the L67. But I think everything else is the same.

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2003 SSEi

Post subject: Re: supercharging a 3.8

Posted: Tue Jan 14, 2014 12:17 pm

Posts like an L67

Joined: Fri Aug 01, 2008 11:57 am
Posts: 1382
Year and Trim: 2003 SSEi.

LOTS of Mods

MattStrike wrote:

Yes. The fuel injectors are in the heads on the L67. But I think everything else is the same.

Matt is correct, the only difference is the injector bosses in the L67 heads

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dirtybird

Post subject: Re: supercharging a 3.8

Posted: Tue Jan 14, 2014 1:21 pm

LE Member

Joined: Tue Jan 14, 2014 10:19 am
Posts: 5
Year and Trim: 1997 Pontiac firebird 3.8 base

thanks, I appreciate the response, I thought standard heads might be higher compression than s/c heads. I had received the heads as part of the package and didn't know if I needed to change them as well.

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MattStrike

Post subject: Re: supercharging a 3.8

Posted: Tue Jan 14, 2014 1:56 pm

Certified Bonneville Nut

Joined: Tue Aug 25, 2009 8:32 pm
Posts: 4760
Location: SE Michigan
Year and Trim: '99 Montana
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'92 Trofeo

The s/c engine has different connecting rods and pistons (and flywheel). The piston has the CR difference, as well as a skirt coating.

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dirtybird

Post subject: Re: supercharging a 3.8

Posted: Tue Jan 14, 2014 4:00 pm

LE Member

Joined: Tue Jan 14, 2014 10:19 am
Posts: 5
Year and Trim: 1997 Pontiac firebird 3.8 base

you appear well informed Matt, thanks for the replies. I may very well be seeking out more of your expertise and advice. thanks again

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crash93ssei

Post subject: Re: supercharging a 3.8

Posted: Tue Jan 14, 2014 4:10 pm

Retired Moderator

Joined: Mon May 19, 2008 6:08 pm
Posts: 7671
Location: Midland, Michigan
Year and Trim: 2002 SE

With supercharging your F Body, you also will need to figure something out for the inlet of the supercharger as it will be going directly into the firewall. It has been done before so it is not impossible, but not as easy as a top swap on a car that also came from the factory supercharged.

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SSEi95

Post subject: Re: supercharging a 3.8

Posted: Tue Jan 14, 2014 4:13 pm

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Joined: Sun May 18, 2008 10:53 pm
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Location: Minneapolis, MN
Year and Trim: 2002 SSEi
'01 Sierra C3

Not sure what you are working on, but if you are swapping engine parts between an S/C and N/A you may find these useful:

performance/topic194.html

performance/topic1687.html

There is more floating around the forum too, but I can't find them at this moment.

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nos4blood70

Post subject: Re: supercharging a 3.8

Posted: Tue Jan 14, 2014 8:06 pm

Certified Bonneville Nut

Joined: Mon May 10, 2010 6:11 pm
Posts: 9522
Location: Chicago, IL
Year and Trim: 2003 SLE

This is something like what Crash93ssei is talking about.

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dirtybird

Post subject: Re: supercharging a 3.8

Posted: Thu Jan 16, 2014 5:49 pm

LE Member

Joined: Tue Jan 14, 2014 10:19 am
Posts: 5
Year and Trim: 1997 Pontiac firebird 3.8 base

not bad.... I had the same idea but a bit more intrusive, I like the way that's done , it will save me a great deal of relocation of fittings, not to mention time. Thanks everyone !!

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