[Z06] Headers and tune complete. Interested in your thoughts.
Thread Starter
Race Director
Joined: Feb 2003
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From: Everyday you must choose between the pain of discipline and the pain of regret. Fredericktown, OH
Headers and tune complete. Interested in your thoughts.
I have an '02 Z with right at 2000 miles on it.
Just had LG Street headers, their cats, and x-pipe installed.
The base line pull was 345+-. After the headers and tune, it made 373. The actual gain with the headers/tune is consistent with what I see - roughly 30+ RWHP.
As a general obervation, I was a little disapointed and was hoping to see 380+. But, when I consider the baseline was lower than many stock Zs, I wonder. Do I have an underperforming Z? Is the dyno not reading as high of numbers as some others (its a Dyno-Jet). A combination of both?
The shop is very reputable and very nice guys. I know they've tuned other cars and gotten good numbers. And as I said, I am pleased with the net gain, just not the final number.
I am just curious of your overall observations.
Just had LG Street headers, their cats, and x-pipe installed.
The base line pull was 345+-. After the headers and tune, it made 373. The actual gain with the headers/tune is consistent with what I see - roughly 30+ RWHP.
As a general obervation, I was a little disapointed and was hoping to see 380+. But, when I consider the baseline was lower than many stock Zs, I wonder. Do I have an underperforming Z? Is the dyno not reading as high of numbers as some others (its a Dyno-Jet). A combination of both?
The shop is very reputable and very nice guys. I know they've tuned other cars and gotten good numbers. And as I said, I am pleased with the net gain, just not the final number.
I am just curious of your overall observations.
Melting Slicks
Joined: Jul 2004
Posts: 2,846
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From: Sandy Ego CA
These LS6 engines seem like they go faster the more miles you put on them, I don't know who tuned your Vette up but I would put some miles on it and then have it retuned by a different tuner.
Racer
Joined: Nov 2004
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It sounds like the car's baseline is a little low. I haven't seen anything lower than 350 rwhp posted on a stock 02-04. Your gains seem pretty good so I wouldn't question the tune and you mentioned the dyno has put out some high numbers in the past, so that rules that out. It's really not horrible, your about 5 rwhp lower than a lot of 02-04 Z's that made ~350 rwhp.
Thread Starter
Race Director
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From: Everyday you must choose between the pain of discipline and the pain of regret. Fredericktown, OH
Originally Posted by RoHo
These LS6 engines seem like they go faster the more miles you put on them, I don't know who tuned your Vette up but I would put some miles on it and then have it retuned by a different tuner.
It just seems like the overall set of numbers is lower than I expected, even the baseline and that has nothign to do with the tuner.
Thread Starter
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From: Everyday you must choose between the pain of discipline and the pain of regret. Fredericktown, OH
Originally Posted by ksett
It sounds like the car's baseline is a little low. I haven't seen anything lower than 350 rwhp posted on a stock 02-04. Your gains seem pretty good so I wouldn't question the tune and you mentioned the dyno has put out some high numbers in the past, so that rules that out. It's really not horrible, your about 5 rwhp lower than a lot of 02-04 Z's that made ~350 rwhp.
I am probably making something out of nothing. I just got back from a drive and it feels very strong. I've had faster cars than this and this thing feels very good.
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Burning Brakes
Joined: Aug 2004
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From: Burton TX
Do you have big aftermarket wheels? Did they check the plugs? That could be 5hp maybe. It also could be your car that day. I have had +/- 10rwhp on the same dyno only a week apart, on the same tune. Like others have said, dont get caught up to much on the numbers, but on how well it performs.
Melting Slicks
Joined: Aug 2000
Posts: 2,568
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From: Miami Fl
Mine dyno'd about 345 when it had 3K miles on it for the baseline. Andy from A&A explained to me that their dyno is set up very conservative and that was about right for a bone stock Z.
They get more power with more miles. How does it feel to you?
They get more power with more miles. How does it feel to you?
Thread Starter
Race Director
Joined: Feb 2003
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From: Everyday you must choose between the pain of discipline and the pain of regret. Fredericktown, OH
Thanks for all the replies! It seems like I had seen too many "355-360 stock" estimations.
The car feels very good and strong, no soft spots in the curve. It idles very good and I am pleased with the gains the tuner got.
It is good to hear mine isn't the only one in the 370s with headers.
I also appreciate the comment on +-10 HP on same dyno. I never had a real grasp on what the actual margin of error was on a chassis dyno. I also was relieved to hear a number of supporters of the notion they make more HP as they break in a bit.
The car feels very good and strong, no soft spots in the curve. It idles very good and I am pleased with the gains the tuner got.
It is good to hear mine isn't the only one in the 370s with headers.
I also appreciate the comment on +-10 HP on same dyno. I never had a real grasp on what the actual margin of error was on a chassis dyno. I also was relieved to hear a number of supporters of the notion they make more HP as they break in a bit.
Le Mans Master
Joined: Dec 2001
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From: Winchester TN
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St. Jude Donor '03-'04-'05-'06-'07-'11
Hi LT4-CE
Nice numbers! The LGs are a real kick in the pants, aren't they?
best regards -
mqqn
Nice numbers! The LGs are a real kick in the pants, aren't they?
best regards -
mqqn
Melting Slicks
Joined: Aug 2000
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From: Miami Fl
LT 4 CE- If you go to a dyno day where other Z's are putting out 350, 360 or whatever and yours in at 340, then, yes, you should check it out, but if the folks from you shop told you that 340(ish) was the norm, then your good.
Race Director
Joined: Oct 2000
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From: N. Alabama
I dynoed on the dynojet at 348 hp w/21k miles on the clock. The dyno here in Smyrna measures most all Z's within the same range. Don't believe all you read on this forum..
While the car was strapped to the dyno, I installed the Honker intake. HP jumped 11 and torque went up 13. If I remember correctly, I am now at 359hp and 347 torque.
While the car was strapped to the dyno, I installed the Honker intake. HP jumped 11 and torque went up 13. If I remember correctly, I am now at 359hp and 347 torque.