Ls6 intake manifold

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May 14, 2019 | 03:58 PM

#21

NemesisC5

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From: Port Arthur, Texas 77642

I stand corrected....it appears the LS6 intake on 2001 & up C5's adds not only 5 HP but an additional 25 FT/LB TQ.
View attached PDF with "print screen" showing dyno graph of 2000 and 2001 comparison...

Horsepower net:

2000 257 kW / 350 PS / 345 hp (SAE net)/ 5600

2001 261 kW / 355 PS / 350 hp (SAE net)/ 5600

Torque net:

2000 475 Nm / 350 ft-lb / 4400

2001 509 Nm / 375 ft-lb / 4400

You can go to site below for specs and performance benchmarks on most production cars

https://www.automobile-catalog.com/

Attached Images

2000 C5 vs 2001 C5 Power Graph.pdf (100.9 KB, 106 views)

May 15, 2019 | 10:50 AM

#22

1997 C5

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From: Volo, Illinois

Quote:

Originally Posted by turabo87

I did this mod too when I did my LS6 intake upgrade to my 99'. It's a common mod. I have zero issues. I also kept all my steam ports stock. I did not want to mess with the steam ports; I'm a firm believer they're there for important cooling reasons.

I read LS1 intake manifold has a hole right behind the throttle body for EGR(guessing stand for emission gas recirculation) and LS6 intake doesn't. So what do I do when I install the LS6 intake on my 97C5 wsince there's no EGR hole?

May 15, 2019 | 11:10 AM

#23

arthursc2

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eliminate the EGR

May 15, 2019 | 12:01 PM

#24

1997 C5

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From: Volo, Illinois

Quote:

Originally Posted by arthursc2

eliminate the EGR

If I do do I need a plug to plug off the hole on the intake manifold? if yes, where can i get one?

Will I pass emission once EGR is eliminated?

I just went and got a emission test I'm good for few years till next test.

May 15, 2019 | 02:13 PM

#25

arthursc2

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There is no spot for the EGR on the LS6 manifold, you said it yourself

LS6's pass emissions without an EGR, I dont see why you wouldnt, just get it tuned out when you get a tune

You will need a block off plate for the exhaust side of things

May 15, 2019 | 03:10 PM

#26

grampi50

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Quote:

Originally Posted by NemesisC5

If I remember correctly, the bump in HP and torque for the '01 and newer models didn't come from just the intake...they also came with a different cam and a different tune...

May 15, 2019 | 03:22 PM

#27

C5Dobie

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Joined: Jan 2014

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From: MA

Quote:

Originally Posted by Chris Draper

Intake alone I would not expect much. I did LS6 heads, intake, and tune and got 30rwhp gain.

I have a C5Z currently, but back in the day I put junkyard 243 LS6 heads (off a wrecked CTSv I believe) & they added just under that for me, of course I think the LS1 in the '04 GTO was a lil stronger from the factory than a early gen C5 to begin w/

May 15, 2019 | 05:37 PM

#28

NemesisC5

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From: Port Arthur, Texas 77642

Quote:

Originally Posted by grampi50

If I remember correctly, the bump in HP and torque for the '01 and newer models didn't come from just the intake...they also came with a different cam and a different tune...

You are correct on both and also 85mm MAF IIRC. Cam specs below pulled from an old document I had saved back in 2006

2000 LS1 cam specs: Int dur 198, exh dur 209, int lift .500. exh lift 500, LSA 115.5
01-04 LS1 cam specs: Int dur 196, exh dur 208, int lift 467. exh lift 479, LSA 116

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May 15, 2019 | 05:54 PM

#29

1997 C5

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From: Volo, Illinois

Quote:

Originally Posted by arthursc2

I haven't put on the LS6 intake yet- I passed emission with the what's on the car from factory the LS1. I wasn't planning on getting tune after LS6 is installed.
I plan on putting on 243 heads, cam, long tube headers but that's a project way down the road year or two from now.

if I don't get a tune after LS6 intake swap will i get a check engine light on?
Where can i get this block off plates? I'm new to this i had no idea it was this complicated just to sway out to LS6 intake.
Visual photos would really help.....

May 15, 2019 | 08:36 PM

#30

arthursc2

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Lol if you think this is complicated.... hahaha

its like 10 bolts, all from the top. This is the easiest mod you can do.

You need a tune. You will get a light.

May 15, 2019 | 09:08 PM

#31

pjdbm

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Joined: Mar 2017

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From: Long Island New York

Quote:

if I don't get a tune after LS6 intake swap will i get a check engine light on?

I did not get any codes, this is a direct swap, absolutely noting extra to do here.
You dont need to get a tune although it would be better but if you plan on doing other mods, wait.

May 15, 2019 | 09:15 PM

#32

arthursc2

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If he deletes EGR without a tune, he will get a light

May 15, 2019 | 09:21 PM

#33

pjdbm

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From: Long Island New York

What EGR? The EGR was on other cars, not the Vette. Are you talking about the secondary Air system with the two exhaust manifold ports? which if eliminated, that will throw a code?

May 15, 2019 | 10:44 PM

#34

arthursc2

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He claims his early LS1 has an EGR inlet on the manifold behind the throttle body. The LS6 has no such provision, and thus will require an EGR elimination

May 16, 2019 | 12:46 PM

#35

1997 C5

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From: Volo, Illinois

Quote:

Originally Posted by pjdbm

I did not get any codes, this is a direct swap, absolutely noting extra to do here.
You dont need to get a tune although it would be better but if you plan on doing other mods, wait.

Ok, thanks now I know I don't have to get a tune. The research I did states the difference from LS1 to LS6 intake is the LS1 intake has a hole right behind the throttle body for EGR, LS6 doesn't have one. Did you eliminate the egr? or just cap off at the egr hoses?

Sorry for this trivial question but i'm not mechanically inclined and knowledgeable don't know much about cars. I"m a newbie in this field.

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