SSpilot

In my attempt to become more mechanically incliended, I was reading, "LS1/LS6 Performance" by, Chris Enders and found out that I, and all 2001 and 2002 LS1's (F-body or C5) have LS6 intake manifolds. Anyway, thought I would share, the book has some good stuff that is tried and proven, so you can learn from others mistakes.

Cal

iTrader: (1)

I heard they switched over to the LS6 manifold somewhere mid 2001 model year, so not all '01s have it. Unfortunatly, you can't tell by looking at it unless you take it off the car.

SSCamaro99_3

iTrader: (1)

EGR=LS1
No EGR=LS6

BIG PD

welcome to the 21st century

machine68

You've got to be carefull about the EGR specifying whether you have a LS1 or an LS6 because my 98 corvette engine doesn't have EGR and it's an LS1.

hondakiller

iTrader: (3)

thought all the EGR-less ls1 intake cars were overseas?

unit213

Not exactly. Some LS1 intakes don't have the EGR provision (97 C5).

Red Shift

hondakiller Isn't yours EGR?
My 98 Z28 is.

00z

wouldnt 2001 f-bodys that did have a ls1 intake carry an egr if not it wouldnt carry an egr?

Speedfreaks101

Vettes did not have EGR.
Any F-body without egr has a LS6 style intake.

CamaroSS

iTrader: (2)

What is EGR, I have never heard this used ever?

Red Shift

EGR=Exhaust Gas Recirculation. Emissions bullshit. Does nothing for performance. Pumps in exhaust gasses back into your intake to cut down on hydrocarbons that may be missed by the cats.

I have heard people say that it hurts performance to disconnect it. I have heard people say that disconnecting does nothing. But I would believe if you could lower your intake temp, by not pumping in 300+ degree dirty air, you would have to realise at least a small perf gain?

Red2000SS

Yes, EGR = Exhaust Gas Recirculation, but I always heard that the purpose of the EGR was to reduce NOx emmisions by reducing combustion temperatures, I don't think EGR does squat for Hydrocarbon emmissions.

SScam68

iTrader: (20)

Red2000SS

Your correct about the EGR and NOX. The CATS remove the hydrocarbons

Red Shift

oops

hondakiller

iTrader: (3)

yes mines EGR but id heard about some EGR-less ls1 intake cars overseas or something.

machine68

One thing that is overlooked about EGR is fuel economy.

Exhaust gases can be considered an inert gas. That means you can fill the combustion chamber with an unburnable gas and use less fuel to achieve complete combustion. When you lower combustion temperatures in this manner you can increase your lean burn potential under cruising and light load conditions. Think of it this way. When you lower the combustion temperature you can lean the engine out more without knocking.

Therefore if the ECU is programmed correctly you have the EGR working only under light load and cruising conditions. The beauty of computer control is that when you give it any kind of throttle the computer turns off the valve. Hence, no change in performance be disconnecting the EGR system.

Since I am using a race computer on my corvette engine I am slightly bummed that I don't have EGR because my potential fuel economy is lowered.

Mark

Red Shift

OK I thougt you didn't have egr stock. I'm really surprised that 01-02's dont.

2000LS1

The 1997-2000 Corvettes all had EGR-less LS1 intake manifolds. That's why you gotta be careful buying an "LS6 intake" on Ebay and thinking it's LS6 just because it doesn't have an EGR hole, you have to look at the bottom too.
I don't know anything about overseas EGR-less LS1 intakes.

2000LS1

I have read that 01-02's F-bodies got a different camshaft to compensate for dropping the EGR.