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Old 07-31-2017, 04:03 PM   #1
Z06zak
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Default c5z headers & intake dyno results

Already posted this over on LS1Tech but figured it would be useful here as well...
Had my car tuned last week after getting the long tubes and the intake installed. Overall I'm very happy with the numbers considering the conditions and the conservative tune, the car feels and sounds amazing. Shout out to Powertech Performance in St. Pete. If any of you guys are in the Pinellas/St. Pete/Tampa area I highly recommend you check them out. Joe (owner & tuner) is an awesome guy and the LS platform is his expertise. He walked me through the tune while it was on the dyno and explained what changes he was making as he went along.

Car: 04 c5 z06, 40k miles

Mods: American Racing 1 3/4" long tubes, off-road x-pipe no cats connected to stock Ti axle-backs. Vararam B2 intake w/ power duct.

Conditions: 92F outside/114F in dyno room, 85% humidity, approx 15ft above sea level.

Stock Baseline: 351hp & 329tq

Final Pull: 388hp & 370tq at only 20 degrees of timing.
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Old 08-02-2017, 02:09 PM   #2
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Is this with or without a tune?
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Old 08-03-2017, 10:23 AM   #3
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Is this with or without a tune?
Final numbers are after tune
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Old 08-03-2017, 10:46 AM   #4
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Solid numbers. I think my 01z only made like 377 with those mods.
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Old 08-04-2017, 11:56 AM   #5
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Solid numbers. I think my 01z only made like 377 with those mods.
Well this is shown in STD so SAE numbers would likely be around 377
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Old 08-06-2017, 08:08 AM   #6
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37 Hp and 41 Tq gains for headers and intake is spectacular. Congrats.
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Old 08-08-2017, 02:14 PM   #7
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Nice job OP. Few more mods and you can crack 400 with the stock cam easy.
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Old 08-10-2017, 11:57 AM   #8
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37 Hp and 41 Tq gains for headers and intake is spectacular. Congrats.
Thanks. Although I kind of wish I would have just gone with 1 7/8" to squeeze out the last few ponies.
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Old 08-10-2017, 12:05 PM   #9
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Nice job OP. Few more mods and you can crack 400 with the stock cam easy.
Really? Maybe a Fast 92 w/ ls2 tb and more timing? I think if I went with 1 7/8" long tubes instead + the fast 92 combo I could crack 400 in STD reading. Unfortunately we couldn't push timing past 20 degrees without seeing some slight knock. Tuner believes its most likely due to the 114+ temp and 85+ humidity holding it back but many others seem to be able to throw 26 degrees or more at their engine with zero issues in similar conditions. It bothers me and I'm wondering if there is some underlying issue causing the low timing knock.
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Old 08-10-2017, 04:25 PM   #10
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Really? Maybe a Fast 92 w/ ls2 tb and more timing? I think if I went with 1 7/8" long tubes instead + the fast 92 combo I could crack 400 in STD reading. Unfortunately we couldn't push timing past 20 degrees without seeing some slight knock. Tuner believes its most likely due to the 114+ temp and 85+ humidity holding it back but many others seem to be able to throw 26 degrees or more at their engine with zero issues in similar conditions. It bothers me and I'm wondering if there is some underlying issue causing the low timing knock.
I'm making 442/395 with the stock cam and heads on my 03Z06.

Are you running a catch can?
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Old 08-10-2017, 10:00 PM   #11
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Very nice. My 03Z 60k miles with the same exact setup, except my x-pipe is catted, made 392. I love how much harder it pulls in upper rpm's with long tubes, and the sound is glorious.
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Old 08-10-2017, 10:04 PM   #12
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Thanks. Although I kind of wish I would have just gone with 1 7/8" to squeeze out the last few ponies.
1 7/8 versus 1 3/4 wouldn't make much difference, maybe 2 to 3 hp. I think if you had your heads ported you would easily break 400 hp.
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Old 08-11-2017, 10:37 AM   #13
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I'm making 442/395 with the stock cam and heads on my 03Z06.

Are you running a catch can?
No catch can yet but it is certainly on the to-do list. Although, I doubt that I am getting enough blow-by to cause knock at such low timing and I don't seem to be burning much oil between changes. I read your thread and no offense but those numbers simply defy logic, I consider your results to be an extreme outlier and not gospel. Not hating, just my honest opinion. Other than that it's an awesome set up and I'm sure it gets down.
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Old 08-11-2017, 10:39 AM   #14
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Very nice. My 03Z 60k miles with the same exact setup, except my x-pipe is catted, made 392. I love how much harder it pulls in upper rpm's with long tubes, and the sound is glorious.
Sweet, and yes it pulls much harder through all rpm
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Old 08-11-2017, 10:41 AM   #15
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Originally Posted by Spaceme1117 View Post
1 7/8 versus 1 3/4 wouldn't make much difference, maybe 2 to 3 hp. I think if you had your heads ported you would easily break 400 hp.
Yeah definitely but I wont be doing heads for long time. Cam is next on the list for power mods.
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Old 08-11-2017, 05:54 PM   #16
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Nice results!
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Old 08-12-2017, 12:43 AM   #17
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Originally Posted by Z06zak View Post
No catch can yet but it is certainly on the to-do list. Although, I doubt that I am getting enough blow-by to cause knock at such low timing and I don't seem to be burning much oil between changes. I read your thread and no offense but those numbers simply defy logic, I consider your results to be an extreme outlier and not gospel. Not hating, just my honest opinion. Other than that it's an awesome set up and I'm sure it gets down.
Thanks. That's the response most people give me. It's a legit build and the track has backed it up. It traps what most cam only cars do on here.
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