What Dynos/tuning give your the best accurate whp #'s?
11-06-2010, 08:29 AM
#16
The Mustang Dyno is most certainly NOT the most accurate.
Roller dyno's have inherent inaccuracy built into their design.
A roller dyno requires the that car be run over a range of RPM's. You know the mass of the roller, and the amount of energy it takes to accelerate it over a certain amount of time. Through a series of equations you can convert this into an estimate of horsepower.
The reason why you see these beautiful arc shaped torque curves... they are estimates.
The Dynapack hub bolt dyno is the best one I've found.
It uses a magnet based braking system to actually measure torque.
As a side benefit this allows you to hold an engine at a given RPM and make changes to the tune under specific circumstance (load,etc.)
All of that said... a standard roller dyno can still be an excellent tool for tuning.
BUT - you asked for the best.
Roller dyno's have inherent inaccuracy built into their design.
A roller dyno requires the that car be run over a range of RPM's. You know the mass of the roller, and the amount of energy it takes to accelerate it over a certain amount of time. Through a series of equations you can convert this into an estimate of horsepower.
The reason why you see these beautiful arc shaped torque curves... they are estimates.
The Dynapack hub bolt dyno is the best one I've found.
It uses a magnet based braking system to actually measure torque.
As a side benefit this allows you to hold an engine at a given RPM and make changes to the tune under specific circumstance (load,etc.)
All of that said... a standard roller dyno can still be an excellent tool for tuning.
BUT - you asked for the best.
I would actually argue that dynapaks are less effective real world tuning tools because you are doing the runs without the wheels. This impacts both the numbers and the way the engine is loaded up. Furthermore, the dynapaks as well as the dyno dynamics dynos only allow a linear acceleration curve when doing a pull. This is very unrealistic and means that the tuner will have to do more fine tuning on the road to adjust for the real world load and acceleration curves. Other dynos like the mustang and dynocom allow the tuner to simulate an actualu real world load curve which better emulates what the car will see on the road.
Thanks
-- Ed
11-06-2010, 09:20 AM
#19
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I'll admit my dyno research is dated; it's very possible that the roller dynos have stepped up their game.
SeaOfGreen - perhaps you could provide a little knowledge before you start calling names.
Sorry if I'm not impressed by your 30 posts.
E-Thug
SeaOfGreen - perhaps you could provide a little knowledge before you start calling names.
Sorry if I'm not impressed by your 30 posts.
E-Thug
11-06-2010, 09:49 AM
#20
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Strange question... A Dyno is a tuning tool, not a benchracing tool. The best answer really would be: "the same dyno and tuner you used last time." I think that's just my opinion though.. Doesn't make much sense to measure your output using one TYPE of dyno and then on another let alone dynos that are set up different. You use the same dyno to see where you are vs. where you were (that delta thingy) so switching dynos would not make sense.
11-06-2010, 09:53 AM
#21
LOWEND I don't post about things I don't know much about, unlike you who thinks they know what there talking about! You even drive a Subaru? E thug? Lol I will meet your little 125pound *** any time son!
Last edited by SeaOfGreen; 11-06-2010 at 09:56 AM.
11-06-2010, 10:04 AM
#24
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thank you for proving my point...
Unless we want to continue talking about the differences in dynos, I am no longer interested in this conversation
Unless we want to continue talking about the differences in dynos, I am no longer interested in this conversation
When your car hits a dyno let know, then we can talk dyno's!
11-06-2010, 11:52 AM
#29
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Dyno's (as you know) are all calibrated differently. Therefore, if you want to compare HP?TQ numbers, both cars need to be tested on the same dyno and under the same conditions. If you really want to compare things though, go to the track and compare drivers. The cars are the tools with the potential for speed, its the drivers (sometimes also tools) that make a car faster (to a certain degree).
Basically though, dyno numbers are not an exact measurement, but rather a reference point.
Basically though, dyno numbers are not an exact measurement, but rather a reference point.
!