[Z06] 2003 vs. 2004 Z06 Difference?
Melting Slicks
Joined: Apr 1999
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From: New Lebanon.Ohio
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Originally Posted by AFVETTE
The shocks were the biggest change. I installed them on my 03, there is a difference.
It's hard to prove but owner reports seem to indicate the 04's are a little stronger. It appears some of the fat that GM built into the LSX series of motors was taken out yielding slightly more HP. Many 04 owner's report getting "lean" codes when they install any low restriction intake like Blackwing etc. Where as, on almost every other LSX motor even after installing an intake the AFR's are still rich. If I had to guess this factory tweaking (if true) may have yielded another 5 HP or so. But every little bit helps. Again there is no official confirmation by GM on this, just anecdotal evidence based on what 04 owners report on the forum.
Hopefully some 04 owners will respond with their opinions as well as dyno numbers and if any of them experienced the "lean codes" after installing an intake.
Tom
It's hard to prove but owner reports seem to indicate the 04's are a little stronger. It appears some of the fat that GM built into the LSX series of motors was taken out yielding slightly more HP. Many 04 owner's report getting "lean" codes when they install any low restriction intake like Blackwing etc. Where as, on almost every other LSX motor even after installing an intake the AFR's are still rich. If I had to guess this factory tweaking (if true) may have yielded another 5 HP or so. But every little bit helps. Again there is no official confirmation by GM on this, just anecdotal evidence based on what 04 owners report on the forum.
Hopefully some 04 owners will respond with their opinions as well as dyno numbers and if any of them experienced the "lean codes" after installing an intake.
Tom
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Joined: Oct 2000
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From: N. Alabama
Originally Posted by HEB
So this means when I install my Blackwing,it will throw a lean code?? If so should I take the Blackwing off? HEB
I have thrown no codes......
Burning Brakes
Joined: May 2004
Posts: 782
Likes: 27
From: Bend OR
04, HAlltech TRAP, no codes. Got a buddy- 03, TRAP, so many codes he took it off.
I heard on here somewhere that the 04 FI included bigger injectors, but maybe that was just an assumption based on the "better capabilities" alluded to above. ??
I heard on here somewhere that the 04 FI included bigger injectors, but maybe that was just an assumption based on the "better capabilities" alluded to above. ??
Team Owner
Joined: Oct 2001
Posts: 56,377
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Originally Posted by acrace
The '04s also had softer rear sway bar bushings and stiffer front control arm bushings (don't remember if it was the upper or lower control arms).
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