Dynamometer Results & Comparisons Dyno Records | Dyno Discussion | Dyno Wars

Dyno flatline

Thread Tools
 
Search this Thread
 
Old Jul 22, 2009 | 05:21 PM
  #1  
OffspringZ28's Avatar
Thread Starter
TECH Enthusiast
20 Year Member
iTrader: (8)
 
Joined: Jan 2006
Posts: 569
Likes: 2
Default Dyno flatline

Hey guys,

check out my graph. it looks there is an abrupt flatline at around 5500rpm. what could cause this? The clutch began to slip a couple days after the dyno and it needed a tune up so I tossed in new plugs and wires. Could this be a valvetrain issue or clutch issue? I was under the impression that a slipping clutch on the dyno would affect trq readings moreso than hp. Thanks for looking!

Reply
Old Jul 23, 2009 | 02:36 PM
  #2  
OffspringZ28's Avatar
Thread Starter
TECH Enthusiast
20 Year Member
iTrader: (8)
 
Joined: Jan 2006
Posts: 569
Likes: 2
Default

Mods are stg 2.5 5.3 heads/TR224 @ 114. Full bolt ons if that helps
Reply
Old Aug 3, 2009 | 08:47 PM
  #3  
OffspringZ28's Avatar
Thread Starter
TECH Enthusiast
20 Year Member
iTrader: (8)
 
Joined: Jan 2006
Posts: 569
Likes: 2
Default

bizzump
Reply
Old Aug 7, 2009 | 11:26 PM
  #4  
XtraCajunSS's Avatar
FormerVendor
iTrader: (2)
 
Joined: Dec 2001
Posts: 1,954
Likes: 4
From: Baton Rouge, LA, USA
Default

What are you running for rocker arms?

Shane
Reply
Old Aug 9, 2009 | 04:45 PM
  #5  
OffspringZ28's Avatar
Thread Starter
TECH Enthusiast
20 Year Member
iTrader: (8)
 
Joined: Jan 2006
Posts: 569
Likes: 2
Default

Originally Posted by XtraCajunSS
What are you running for rocker arms?

Shane
stock
Reply
Old Aug 9, 2009 | 06:37 PM
  #6  
Slowhawk's Avatar
LS1Tech Sponsor
iTrader: (12)
 
Joined: Nov 2001
Posts: 14,865
Likes: 6
From: Bridgewater,Ma
Default

It could be the clutch,the torque is dropping more than it should too.The dyno operator should of known since the clutch peddle wouldn't come back up after the run.
Reply
Old Aug 9, 2009 | 08:36 PM
  #7  
OffspringZ28's Avatar
Thread Starter
TECH Enthusiast
20 Year Member
iTrader: (8)
 
Joined: Jan 2006
Posts: 569
Likes: 2
Default

Originally Posted by Slowhawk
It could be the clutch,the torque is dropping more than it should too.The dyno operator should of known since the clutch peddle wouldn't come back up after the run.
clutch pedal never really acted up. it just slips now under load in 4th and higher gears
Reply
Old Aug 9, 2009 | 10:57 PM
  #8  
SKINNY69's Avatar
Launching!
15 Year Member
 
Joined: Jul 2008
Posts: 205
Likes: 10
From: Newville, PA
Default

Originally Posted by OffspringZ28
clutch pedal never really acted up. it just slips now under load in 4th and higher gears
I think you answered your own question.
Reply
LS1 Tech Stories

The Best V8 Stories One Small Block at Time

story-0

Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

 Verdad Gallardo
story-1

Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

 Pouria Savadkouei
story-2

Top 10 Most Powerful Chevy Trucks Ever Made!

 
story-3

Hennessey's New Supercharged Silverado ZR2 Has 700 HP

 Verdad Gallardo
story-4

Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

 Verdad Gallardo
story-5

Awesome K5 Blazer Restomod Comes With C7 Corvette Power

 Verdad Gallardo
story-6

10 Camaros You Should Never Buy

 
story-7

10 LS Engine Myths That Refuse to Die

 Verdad Gallardo
story-8

Five Reasons the Camaro Was the Most Pivotal Player in the Pony Car Wars 2.0

 Brett Foote
story-9

10 Reasons the LS7 Is GM's Most Extreme Naturally Aspirated V8 Engine Ever

 Verdad Gallardo
Old Aug 10, 2009 | 06:36 AM
  #9  
OffspringZ28's Avatar
Thread Starter
TECH Enthusiast
20 Year Member
iTrader: (8)
 
Joined: Jan 2006
Posts: 569
Likes: 2
Default

Originally Posted by SKINNY69
I think you answered your own question.
True lol. I had just never seen a graph with a slipping clutch so I wasn't real sure
Reply




All times are GMT -5. The time now is 07:08 AM.

story-0
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

Slideshow: A modern Camaro transformed into a retro icon, this limited-run "Bandit" build blends nostalgia with brute force in a way few revivals manage.

By Verdad Gallardo | 2026-04-21 13:57:02


VIEW MORE
story-1
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

Slideshow: Cadillac didn't just crash the high-performance luxury vehicle party, it showed up loud, supercharged, and occasionally a little unhinged...

By Pouria Savadkouei | 2026-04-16 10:05:15


VIEW MORE
story-2
Top 10 Most Powerful Chevy Trucks Ever Made!

Slideshow: Top ten most powerful Chevy trucks ever made

By | 2026-03-25 09:22:26


VIEW MORE
story-3
Hennessey's New Supercharged Silverado ZR2 Has 700 HP

Slideshow: Hennessey has turned the Silverado ZR2 into a 700-hp off-road monster with supercharged V8 power and a limited production run.

By Verdad Gallardo | 2026-03-24 18:57:52


VIEW MORE
story-4
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

Slideshow: A one-off sports car that looks like a vintage Italian exotic-but hides a C6 Corvette underneath-just sold for the price of a new mid-engine Corvette.

By Verdad Gallardo | 2026-03-23 18:53:41


VIEW MORE
story-5
Awesome K5 Blazer Restomod Comes With C7 Corvette Power

Slideshow: A heavily reworked 1972 K5 Blazer swaps its off-road roots for a low-slung street-focused build with modern V8 power.

By Verdad Gallardo | 2026-03-09 18:08:45


VIEW MORE
story-6
10 Camaros You Should Never Buy

Slideshow: There are thousands of used Camaros on the market but we think you should avoid these 10

By | 2026-02-17 17:09:30


VIEW MORE
story-7
10 LS Engine Myths That Refuse to Die

Slideshows: Which one of these myths do you believe?

By Verdad Gallardo | 2026-01-28 18:10:11


VIEW MORE
story-8
Five Reasons the Camaro Was the Most Pivotal Player in the Pony Car Wars 2.0

The world was a better place when it was still around.

By Brett Foote | 2026-01-23 09:20:37


VIEW MORE
story-9
10 Reasons the LS7 Is GM's Most Extreme Naturally Aspirated V8 Engine Ever

Slideshow: The 7.0-liter LS7 was designed for absolute cutting-edge performance.

By Verdad Gallardo | 2026-01-07 18:36:00


VIEW MORE