Forced Induction Superchargers | Turbochargers | Intercoolers

crazy amounts of torque on the dyno..

Thread Tools
 
Search this Thread
 
Old Dec 4, 2014 | 09:53 AM
  #1  
1bad03snake's Avatar
Thread Starter
TECH Enthusiast
iTrader: (16)
 
Joined: Dec 2008
Posts: 548
Likes: 1
From: Pasadena,Tx
Default crazy amounts of torque on the dyno..

My car is making 200 lbs more torque than hp on a mustang dyno. 870ftlbs at 3500 rpm. Do you think it's a converter issue? My tuner says the staor is wrong. I have a fti sst
Reply
Old Dec 4, 2014 | 10:05 AM
  #2  
JoeNova's Avatar
Restricted User
 
Joined: Mar 2014
Posts: 7,192
Likes: 109
From: Ohio
Default

Wouldn't happen to be running methanol would you?

Its typical to make more torque than HP on a mustang dyno, but that is a pretty insane amount of torque at 3500 RPM.
Reply
Old Dec 4, 2014 | 10:10 AM
  #3  
1bad03snake's Avatar
Thread Starter
TECH Enthusiast
iTrader: (16)
 
Joined: Dec 2008
Posts: 548
Likes: 1
From: Pasadena,Tx
Default

93 octane and 100% meth. 15gpm nozzle
Reply
Old Dec 4, 2014 | 01:50 PM
  #4  
chiaj144's Avatar
Banned
iTrader: (4)
 
Joined: Dec 2009
Posts: 483
Likes: 1
From: Usa
Default

My car did the same thing on the dyno. Part of it is the converter flashing and part of it in my case was boost falling off. My car would make commanded boost when the converter flashed but start bleeding off until max rpm as the roller couldn't keep the car loaded. I can't remember exactly but I think it was close to 3lbs. I made 170 more torque. On the street the car made full boost through the entire rpm range and ran great. I wouldn't worry about anything unless you see an issue on the street or track.
Reply
Old Dec 5, 2014 | 07:17 AM
  #5  
408GT's Avatar
TECH Resident
15 Year Member
Liked
Loved
Community Favorite
iTrader: (2)
 
Joined: Jan 2008
Posts: 966
Likes: 19
From: GA
Default

When I had small twins on my L92, the dyno showed 600 whp and over 900 ft/lbs. I don't remember what kind of dyno it was. Tuner said it was something with the converter.

Denmah had the same results when he did the small twins on that white truck. low power lots of torque.
Reply
Old Dec 5, 2014 | 09:03 AM
  #6  
Forcefed86's Avatar
8 Second Club
15 Year Member
Liked
Loved
Community Favorite
iTrader: (4)
 
Joined: May 2011
Posts: 8,483
Likes: 1,027
From: Wichita, KS
Default

Talk to ur converter supplier and find out what it has in it. What kind of rpm drop do you see on the shifts? Slippage up top? Basic rundown of your setup and turbo? Boost level at pk torque?

Id take it to the track and see how it acts. Bet you could leave on 1-2 psi on the foot brake and build boost really fast. If your not slipping excessivly on the top end id leave it.
Reply
Old Dec 5, 2014 | 09:52 AM
  #7  
NicD's Avatar
7 Second Club
20 Year Member
Photogenic
Liked
Loved
iTrader: (7)
 
Joined: Nov 2001
Posts: 3,170
Likes: 690
From: Chandler, AZ
Default

That big torque spike is pretty typical on a mustang dyno with a stalled auto, I'd ignore it and just look at the horsepower curve.
Reply
Old Dec 5, 2014 | 10:51 AM
  #8  
LJMSJohn's Avatar
FormerVendor
 
Joined: Aug 2014
Posts: 473
Likes: 1
Default

Typical of a stalled auto on a mustang.... its converter flash....

For the dyno to say the converter is wrong.... is a big stretch....
Reply
LS1 Tech Stories

The Best V8 Stories One Small Block at Time

story-0

Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

 Verdad Gallardo
story-1

6 Common C5 Corvette Failures and What's Involved In Repairing Them

 Pouria Savadkouei
story-2

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

 Verdad Gallardo
story-3

Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

 Pouria Savadkouei
story-4

Top 10 Most Powerful Chevy Trucks Ever Made!

 
story-5

Hennessey's New Supercharged Silverado ZR2 Has 700 HP

 Verdad Gallardo
story-6

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

 Verdad Gallardo
story-7

Awesome K5 Blazer Restomod Comes With C7 Corvette Power

 Verdad Gallardo
story-8

10 Camaros You Should Never Buy

 
story-9

10 LS Engine Myths That Refuse to Die

 Verdad Gallardo
Old Dec 5, 2014 | 01:04 PM
  #9  
willizm's Avatar
9 Second Club
iTrader: (10)
 
Joined: Apr 2009
Posts: 1,230
Likes: 3
From: Joliet,IL and Las Vegas 50/50
Default

Originally Posted by Forcefed86
Talk to ur converter supplier and find out what it has in it. What kind of rpm drop do you see on the shifts? Slippage up top? Basic rundown of your setup and turbo? Boost level at pk torque?

Id take it to the track and see how it acts. Bet you could leave on 1-2 psi on the foot brake and build boost really fast. If your not slipping excessivly on the top end id leave it.
I had the same sort of thing happen with me on the dyno but at the track I have very little slip. I think it's just the converter flash. Other than dyno numbers being weird I my Yank-PY3400 works awesome at the track and on the street.
Reply
Old Dec 5, 2014 | 04:25 PM
  #10  
gsteele's Avatar
TECH Enthusiast
10 Year Member
Liked
 
Joined: Mar 2013
Posts: 503
Likes: 38
Default

I am having trouble reading the printout but what HP is it showing at 3500? 870 torque is 580 HP at 3500 and it does not look like that is what it is indicating. It looks like a pretty flat HP curve after 3500. Again, I am having trouble reading it as it is blurry.
Reply
Old Dec 5, 2014 | 05:34 PM
  #11  
1bad03snake's Avatar
Thread Starter
TECH Enthusiast
iTrader: (16)
 
Joined: Dec 2008
Posts: 548
Likes: 1
From: Pasadena,Tx
Default

Yea the hp curve is pretty flat. Ill.get a better pic when I get home. Your seeing it right 870/580 at 3500 I'm going to try to make it to the track next friday and see how it runs.
Reply
Old Dec 5, 2014 | 08:14 PM
  #12  
coltboostin's Avatar
TECH Fanatic
10 Year Member
Photogenic
Photoriffic
Shutterbug
 
Joined: Jun 2013
Posts: 1,163
Likes: 16
From: Avon, Ohio
Default

Originally Posted by LJMSJohn
Typical of a stalled auto on a mustang.... its converter flash....

For the dyno to say the converter is wrong.... is a big stretch....
Bingo.

Dyno operator does not even know how his dyno works.
Reply




All times are GMT -5. The time now is 10:50 PM.

story-0
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

Slideshow: This heavily modified 1971 Camaro mixes classic muscle car styling with a fifth-generation Camaro interior and modern LS3 power.

By Verdad Gallardo | 2026-05-12 18:06:42


VIEW MORE
story-1
6 Common C5 Corvette Failures and What's Involved In Repairing Them

Slideshow: From wobbling harmonic balancers to failed EBCMs, these are the issues that define long-term C5 ownership and what repairs typically involve.

By Pouria Savadkouei | 2026-05-07 18:44:57


VIEW MORE
story-2
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-3
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-4
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-5
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-6
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-7
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-8
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-9
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