Just Dynoed with weird results
Thread Starter
Registered User
Joined: Oct 2000
Posts: 360
Likes: 0
From: Port Angeles
Just Dynoed with weird results
The one thing I can do as well as anyone on this board is throw away money. I just had my S2000 dynoed with the following results: HP 173 and torque 295. Honda must have put in a slightly different rear end in this car. The shop manufacturers chips for various American cars and is run by a couple of old codgers (actually they seem to know a heck of alot about some cars). They have a Precision load cell dyno which measures hp by putting a load on the engine as opposed to testing through inertia. It cost $50,000 so I guess it serves a purpose. I don't know what these results indicate except that I am out $90. Even if you reduce the torque with the gear ratios (tested in fourth gear) it is still much too high. The operator said that the hp would be about 20% higher if measured on a dynajet. Anybody have any experience with this type of dyno?
They did have an incredible 1972 Detomasso Pantera which they are restoring using some beautiful carbon fiber parts and installing fuel injectors rather than carbs.
They did have an incredible 1972 Detomasso Pantera which they are restoring using some beautiful carbon fiber parts and installing fuel injectors rather than carbs.
Thread Starter
Registered User
Joined: Oct 2000
Posts: 360
Likes: 0
From: Port Angeles
UL,
I thought you would be the man to know all this stuff. They said it was load cell dyno. The operator dials in a torque number on the machine and then will keep turning it down until he feels the engine start to bog and then uses this torque figure to test for the hp. I should have left right after they had me put the front wheels on the rollers. If I hadn't been there it would have been interesting when they put the car into gear. He said that inertia type dynos like the dynapack (sp)
do not load the engine and will give higher readings.
The Pantera was nice. I had to pay $90 to see it, though.
I thought you would be the man to know all this stuff. They said it was load cell dyno. The operator dials in a torque number on the machine and then will keep turning it down until he feels the engine start to bog and then uses this torque figure to test for the hp. I should have left right after they had me put the front wheels on the rollers. If I hadn't been there it would have been interesting when they put the car into gear. He said that inertia type dynos like the dynapack (sp)
do not load the engine and will give higher readings.
The Pantera was nice. I had to pay $90 to see it, though.
Thread Starter
Registered User
Joined: Oct 2000
Posts: 360
Likes: 0
From: Port Angeles
For anybody who is interested, this explains the difference between dynos. Nascar uses a dynojet and they seem to be pretty consistant from machine to machine.
An acceleration dyno uses the power of the engine to accelerate a known weight to speed. By calculating the time it takes to get up to speed, the horsepower is determined.
Other dynamometers uses a load cell to increase the load on an engine, creating a realistic map of what an engine does under riding conditions.
(From Dynojet literature) DynoJet is the official dyno of NASCAR and many other racingorganizations worldwide. It is repeatable to within tenths of a horsepower. To prove this point, Sport Compact Car magazine took one of their cars to several different DynoJet dyno facilities for testing and all of the different
DynoJet dynos gave nearly identical horsepower figures. That same car was taken to several different Clayton or
Mustang "load cell" dynos and none of the figures were even remotely close to being the same.
An acceleration dyno uses the power of the engine to accelerate a known weight to speed. By calculating the time it takes to get up to speed, the horsepower is determined.
Other dynamometers uses a load cell to increase the load on an engine, creating a realistic map of what an engine does under riding conditions.
(From Dynojet literature) DynoJet is the official dyno of NASCAR and many other racingorganizations worldwide. It is repeatable to within tenths of a horsepower. To prove this point, Sport Compact Car magazine took one of their cars to several different DynoJet dyno facilities for testing and all of the different
DynoJet dynos gave nearly identical horsepower figures. That same car was taken to several different Clayton or
Mustang "load cell" dynos and none of the figures were even remotely close to being the same.
Thread
Thread Starter
Forum
Replies
Last Post