C6 Tech/Performance LS2, LS3, LS7, LS9 Corvette Technical Info, Internal Engine, External Engine, Tech Topics, Basic Tech, Maintenance, How to Remove & Replace
Sponsored by:
Sponsored by:

Estimated RWHP?

Thread Tools
 
Search this Thread
 
Old Nov 20, 2011 | 12:54 PM
  #1  
Toigs325's Avatar
Toigs325
Thread Starter
Intermediate
 
Joined: Nov 2011
Posts: 35
Likes: 0
From: Greenville Texas
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!
Reply
Old Nov 20, 2011 | 01:00 PM
  #2  
timd38's Avatar
timd38
Race Director
20 Year Member
Liked
Loved
Community Favorite
 
Joined: Aug 2005
Posts: 13,592
Likes: 187
From: Hudson WI
NCM Sinkhole Donor
Default

340
Reply
Old Nov 20, 2011 | 01:06 PM
  #3  
matt_lowry123's Avatar
matt_lowry123
Racer
15 Year Member
All Eyes On Me
 
Joined: Oct 2008
Posts: 415
Likes: 5
From: Owensboro Ky
St. Jude Donor '11
Default

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
Reply
Old Nov 20, 2011 | 02:44 PM
  #4  
Toigs325's Avatar
Toigs325
Thread Starter
Intermediate
 
Joined: Nov 2011
Posts: 35
Likes: 0
From: Greenville Texas
Default

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.
Reply
Old Nov 20, 2011 | 03:27 PM
  #5  
robz's Avatar
robz
Le Mans Master
20 Year Member
 
Joined: Nov 2003
Posts: 8,308
Likes: 157
From: NJ
Default

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.
Reply
Old Nov 20, 2011 | 03:47 PM
  #6  
timd38's Avatar
timd38
Race Director
20 Year Member
Liked
Loved
Community Favorite
 
Joined: Aug 2005
Posts: 13,592
Likes: 187
From: Hudson WI
NCM Sinkhole Donor
Default

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.

Reply
Old Nov 20, 2011 | 05:14 PM
  #7  
taken19's Avatar
taken19
Track Junky
15 Year Member
Conversation Starter
All Eyes On Me
Photogenic
 
Joined: Jun 2007
Posts: 4,074
Likes: 36
From: Orlando Area
Tech Contributor
Default

I would agree with the guys above... 345ish without tune amd 360 or so with tune.
Reply
Old Nov 20, 2011 | 05:42 PM
  #8  
HOXXOH's Avatar
HOXXOH
Race Director
15 Year Member
Liked
Loved
Community Favorite
 
Joined: Sep 2007
Posts: 16,557
Likes: 2,104
From: Peoria/Phoenix AZ
C6 of Year Finalist (performance mods) 2019
Default

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.
Reply
Corvette Stories

The Best of Corvette for Corvette Enthusiasts

story-0

Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)

 Joe Kucinski
story-1

Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!

 Verdad Gallardo
story-2

Top 10 Corvettes Coming to Mecum Indy 2026!

 Brett Foote
story-3

Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!

 Michael S. Palmer
story-4

10 Revolutionary 'Corvette Firsts' Most People Don't Know

 Joe Kucinski
story-5

5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2

 Michael S. Palmer
story-6

2027 Corvette vs The World: Every C8 vs Its Closest Competitor

 Joe Kucinski
story-7

10 Most Common Corvette Problems of the Last 20 Years!

 Joe Kucinski
story-8

5 MOST and 5 LEAST Popular Corvette Model Years in History!

 Joe Kucinski
story-9

2027 Corvette Buyer's Guide: Everything You Need to Know!

 Joe Kucinski
Old Nov 20, 2011 | 05:46 PM
  #9  
saplumr's Avatar
saplumr
Race Director
Supporting Lifetime
15 Year Member
 
Joined: Oct 2005
Posts: 14,555
Likes: 1,255
From: Saint Albans, WV
Default

335-350 at best.
Reply
Old Nov 20, 2011 | 05:58 PM
  #10  
dicky's Avatar
dicky
Burning Brakes
15 Year Member
Liked
 
Joined: May 2006
Posts: 1,110
Likes: 16
From: stuart fl
Default

stock the manual LS2s put down 350-355 so i would guess 365-370 with a tune
Reply
Old Nov 20, 2011 | 06:00 PM
  #11  
saplumr's Avatar
saplumr
Race Director
Supporting Lifetime
15 Year Member
 
Joined: Oct 2005
Posts: 14,555
Likes: 1,255
From: Saint Albans, WV
Default

Originally Posted by dicky
stock the manual LS2s put down 325-350 so i would guess 365-370 with a tune
Fixed it.
Reply
Old Nov 20, 2011 | 06:10 PM
  #12  
Toigs325's Avatar
Toigs325
Thread Starter
Intermediate
 
Joined: Nov 2011
Posts: 35
Likes: 0
From: Greenville Texas
Default

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
Reply
Old Nov 20, 2011 | 09:42 PM
  #13  
Chuck CoW's Avatar
0Chuck CoW
Former Vendor
 
Joined: Nov 2005
Posts: 11,792
Likes: 255
From: Ossining New York
St. Jude Donor '07-'08-'09-'10-'12-'13-'14
Default Call me when you're ready....

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
Reply
Old Nov 21, 2011 | 08:07 AM
  #14  
LSCHLEM's Avatar
LSCHLEM
Melting Slicks
15 Year Member
 
Joined: Sep 2007
Posts: 2,597
Likes: 3
From: READING PA
St. Jude Donor '08-'09-'10
Default

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
Reply
Old Nov 21, 2011 | 06:37 PM
  #15  
matt_lowry123's Avatar
matt_lowry123
Racer
15 Year Member
All Eyes On Me
 
Joined: Oct 2008
Posts: 415
Likes: 5
From: Owensboro Ky
St. Jude Donor '11
Default

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!!
Reply
Old Nov 21, 2011 | 08:02 PM
  #16  
Chuck CoW's Avatar
0Chuck CoW
Former Vendor
 
Joined: Nov 2005
Posts: 11,792
Likes: 255
From: Ossining New York
St. Jude Donor '07-'08-'09-'10-'12-'13-'14
Default Pasadena.....

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
Reply
Old Nov 21, 2011 | 09:29 PM
  #17  
matt_lowry123's Avatar
matt_lowry123
Racer
15 Year Member
All Eyes On Me
 
Joined: Oct 2008
Posts: 415
Likes: 5
From: Owensboro Ky
St. Jude Donor '11
Default

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!!!
Reply

Get notified of new replies

To Estimated RWHP?

Old Nov 21, 2011 | 11:37 PM
  #18  
SoonerC6's Avatar
SoonerC6
Racer
15 Year Member
All Eyes On Me
Liked
 
Joined: Feb 2007
Posts: 315
Likes: 0
From: Norman OK
Default

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.
Reply
Old Nov 22, 2011 | 05:49 AM
  #19  
timd38's Avatar
timd38
Race Director
20 Year Member
Liked
Loved
Community Favorite
 
Joined: Aug 2005
Posts: 13,592
Likes: 187
From: Hudson WI
NCM Sinkhole Donor
Default

So we are back to post #2. 340
Reply
Old Nov 22, 2011 | 08:57 AM
  #20  
COVERT GUY's Avatar
COVERT GUY
Pro
15 Year Member
 
Joined: Jan 2001
Posts: 512
Likes: 0
From: Houston Texas
Default

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.
Reply



All times are GMT -4. The time now is 07:47 AM.

story-0
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)

Slideshow: Ranking the top 10 Corvette engines by torque output.

By Joe Kucinski | 2026-05-05 11:58:09


VIEW MORE
story-1
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!

Slideshow: A Corvette pace car nearly matching IndyCar speeds sounds exaggerated, until you look at the numbers.

By Verdad Gallardo | 2026-05-04 20:03:36


VIEW MORE
story-2
Top 10 Corvettes Coming to Mecum Indy 2026!

Among a rather large group of them.

By Brett Foote | 2026-05-04 13:56:44


VIEW MORE
story-3
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!

Slideshow: the top 10 things Corvette owners want in the C9 Corvette

By Michael S. Palmer | 2026-04-30 12:41:15


VIEW MORE
story-4
10 Revolutionary 'Corvette Firsts' Most People Don't Know

Slideshow: 10 Important Corvette 'firsts' that every fan should know.

By Joe Kucinski | 2026-04-29 17:02:16


VIEW MORE
story-5
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2

Slideshow: Should you buy a 2020-2026 Corvette or wait for 2027?

By Michael S. Palmer | 2026-04-22 10:08:58


VIEW MORE
story-6
2027 Corvette vs The World: Every C8 vs Its Closest Competitor

Slideshow: 2027 Corvette lineup vs the world.

By Joe Kucinski | 2026-04-24 16:12:42


VIEW MORE
story-7
10 Most Common Corvette Problems of the Last 20 Years!

Slideshow: 10 major Corvette problems from the last 20 years.

By Joe Kucinski | 2026-04-14 16:37:05


VIEW MORE
story-8
5 MOST and 5 LEAST Popular Corvette Model Years in History!

Slideshow: 5 most and least popular Corvette model years.

By Joe Kucinski | 2026-04-08 13:25:01


VIEW MORE
story-9
2027 Corvette Buyer's Guide: Everything You Need to Know!

Slideshow: 2027 Corvette buyer's guide

By Joe Kucinski | 2026-04-17 16:41:08


VIEW MORE