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Estimated RWHP?

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Old Nov 20, 2011 | 12:54 PM
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Default Estimated RWHP?

I have a stock 2005 C6 Z51 with the 6-speed manual. Just ordered a couple things and was wondering what I could expect for actual RWHP?

- Magnaflow Exhaust system...no X-pipe or header
- 160 degree thermostat
- Vararam VR-SC1
- Vararam throttlebody spacer

Thanks for your help!
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Old Nov 20, 2011 | 01:00 PM
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340
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Old Nov 20, 2011 | 01:06 PM
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I have an 08 auto with a vararam and stingers. I dyno'ed in at 367hp 357tq. I'd say you're not far off from my numbers

Last edited by matt_lowry123; Nov 20, 2011 at 01:08 PM. Reason: Had numbers backwards
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Old Nov 20, 2011 | 02:44 PM
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Its got to be higher than 340 right? I am hoping to have 360 with a good tune. Next mods are CoW Booster and tune.
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Old Nov 20, 2011 | 03:27 PM
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Originally Posted by Toigs325
I have a stock 2005 C6 Z51 with the 6-speed manual. Just ordered a couple things and was wondering what I could expect for actual RWHP?

- Magnaflow Exhaust system...no X-pipe or header (+5)
- 160 degree thermostat (0)
- Vararam VR-SC1 (+10 at high speed)
- Vararam throttlebody spacer (0)

Thanks for your help!
My guesses.
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Old Nov 20, 2011 | 03:47 PM
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Originally Posted by Toigs325
Its got to be higher than 340 right? I am hoping to have 360 with a good tune. Next mods are CoW Booster and tune.
You lose 15% to 18% through the powertrain. 360 with a tune sounds right. I got almost 400 with headers, K&N, MagnaFlow and a tune.

Got over 500 with additional changes.

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Old Nov 20, 2011 | 05:14 PM
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I would agree with the guys above... 345ish without tune amd 360 or so with tune.
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Old Nov 20, 2011 | 05:42 PM
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Originally Posted by Toigs325
Its got to be higher than 340 right? I am hoping to have 360 with a good tune. Next mods are CoW Booster and tune.
Your current mods won't show much of anything over stock on a dyno, so 340 is a gift. The CoW Booster only changes your foot pedal position related to the throttle plate, so no HP there either.

The tune done by a qualified tuner on a dyno will get the most immediate improvement. But if then tweaked on the street, will be the most performance increase. The Vararam on the dyno is insignificant, but makes power when moving. (faster is better )

If you're just looking for a number on a dyno sheet, you can create one of any HP on your computer for cheap. If real world performance figures are what you desire, then go to the dragstrip.
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Old Nov 20, 2011 | 05:46 PM
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335-350 at best.
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Old Nov 20, 2011 | 05:58 PM
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stock the manual LS2s put down 350-355 so i would guess 365-370 with a tune
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Old Nov 20, 2011 | 06:00 PM
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Originally Posted by dicky
stock the manual LS2s put down 325-350 so i would guess 365-370 with a tune
Fixed it.
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Old Nov 20, 2011 | 06:10 PM
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I am going for functional and reliable performance for the street. I just wanted a ballpark number to be able to tell someone when they say "wow, this thing is quick, how much horsepower does it have." After the CoW Booster and tune from Chuck in February, I am going to strap a 100hp Zex nitrous kit on it next year...that should be enough to get me in trouble I think. Thanks for the responses
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Old Nov 20, 2011 | 09:42 PM
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Originally Posted by Toigs325
I am going for functional and reliable performance for the street. I just wanted a ballpark number to be able to tell someone when they say "wow, this thing is quick, how much horsepower does it have." After the CoW Booster and tune from Chuck in February, I am going to strap a 100hp Zex nitrous kit on it next year...that should be enough to get me in trouble I think. Thanks for the responses
Call me when you're ready.... Right now, I'm talking with VARARAM about a trip to their

facility in January or February.

I'm gonna be giving deals on VARARAMS, stats, tunes, headers, CoW BOOSTERS and

what ever other stuff I can think of.....

SPREAD THE WORD.... Chuck CoW is COMING TO TEXAS THIS WINTER!

Tell your friends!
Chuck CoW
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Old Nov 21, 2011 | 08:07 AM
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340 is the baseline for what you have. A Tune is good for 20 rw. The VR
will give you more but not on the DYNO. The COW DEVICE will make your Car more responsive along with the tune. You need Headers (LT's) and a FAST Manifold with a Ported TB. You will notice quite a difference and
you just might make 400 RWHP. Good luck. Leon
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Old Nov 21, 2011 | 06:37 PM
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Originally Posted by Chuck CoW
Call me when you're ready.... Right now, I'm talking with VARARAM about a trip to their

facility in January or February.

I'm gonna be giving deals on VARARAMS, stats, tunes, headers, CoW BOOSTERS and

what ever other stuff I can think of.....

SPREAD THE WORD.... Chuck CoW is COMING TO TEXAS THIS WINTER!

Tell your friends!
Chuck CoW
What part of TX and when? I might need to jump on the band wagon!!
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Old Nov 21, 2011 | 08:02 PM
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Originally Posted by matt_lowry123
What part of TX and when? I might need to jump on the band wagon!!
PASADENA.....


But, NO PORTED THROTTLE BODIES.... Waste of money.

The CoW BOOSTER will fix you up right!

Chuck CoW
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Old Nov 21, 2011 | 09:29 PM
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Originally Posted by Chuck CoW
PASADENA.....


But, NO PORTED THROTTLE BODIES.... Waste of money.

The CoW BOOSTER will fix you up right!

Chuck CoW

Thanks!!! I'm saving up my money as we speak!!!
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Old Nov 21, 2011 | 11:37 PM
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Originally Posted by saplumr
Fixed it.
yeah my 1st c6 ('05) m6 put down 330 bone stock... So i think you're around maybe 340, and would be about 350ish w/ a tune.
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Old Nov 22, 2011 | 05:49 AM
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So we are back to post #2. 340
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Old Nov 22, 2011 | 08:57 AM
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Originally Posted by Chuck CoW
PASADENA.....


But, NO PORTED THROTTLE BODIES.... Waste of money.

The CoW BOOSTER will fix you up right!

Chuck CoW
Sure. I've seen ported throttle bodies pick up 7-9 rwhp consistently on many different vehicles including many of my own. Even responsiveness is improved. Nothing wrong with your product if people like the feel of accelerating faster, without actually gaining any hp or tq, but I prefer actual gains over perceived gains.
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