JGKadell

iTrader: (4)

Would that make sense?
I bought a set of TTS long tube headers and they came off a 2000 so the EGR stuff was different. I didn't have the right stuff so I just left it off and put an expansion plug in the intake until I get the LS6 intake.
I have a custom tune by MCG of St Louis and it was done when the EGR was in tact with the Mac headers.

My dyno was pretty nice though

330.4 HP @ 6100
318.3 TQ @ 4100

jrp

iTrader: (16)

the EGR should be the same as the 00, its the air pipes that are different.

i ran with a block off plate, !egr/!air,!rear o2 sensors with no tuning and no problems after my LT, Y, catback install.

2xLS1

iTrader: (25)

98-99s use a different EGR tube than the 00s. It bolts to a different location on the 00s cast iron manifolds.

I just did the same thing yesterday putting 98-99 MACs on a 00. Used the rubber exp. plug in the manifold.

You say the A/F went crazy, but you gave no details. Kind of hard to comment without some details.

jrp

iTrader: (16)

thanks for the info, i didnt know that. so then the 2000 headers are a one off then huh if both the air and egr have a different setup.

JGKadell

iTrader: (4)

http://jk1066.autotechforums.com/misc/a%20f%20scan.jpg

2000silverbullet

iTrader: (5)

What did it look like before you changed headers and egr? Looks like your running a pretty good a/f mixture and than really really rich. Are you sure there was no problem before the header install / egr removal? Do you have a base line? Where is the RPM band on that graph? Again hard to help with so little info.

JGKadell

iTrader: (4)

yhr rpm is at the bottom of the graph, and yes I have baseline #'s

2xLS1

iTrader: (25)

I think there was a problem with the wideband on the dyno. IMO, I think your car would be noticeably running like crap if the A/F was really jumping around like that. If the plug in the manifold was leaking or there was air getting into the exhaust system, it would go lean across the board.

JGKadell

iTrader: (4)

its possible. but my friend did his car after mine and it seemed ok
here is a dyno sheet from last spring
http://jk1066.autotechforums.com/dyn...ragingdyno.JPG

2xLS1

iTrader: (25)

What did the HP and TQ curve do when the A/F was jumping around? If they were stable or unaffected I'd still have to say it was the wideband malfunction.

felton316

Do you still have the Cat Over Temp protection on in the tune you have? That's what the graph kind've looks like to me.

JGKadell

iTrader: (4)

the cat overtemp is off