Tremek Car Video Forum

Gilly · 18 Mar 2004, 04:03 am

Yes I could search the net but I'd rather get the insight of people here and this place needs more tech talk so...

Can anyone please give me an explanation of how you run a car whilst dyno testing? Do you run from a certain RPM in a certain gear, or do multiple passes in multiple gears and then get an average? what does the test show? just BHP and Torque?

Thanks

Pa231 · 03 Apr 2004, 06:59 am

I have a question too about dyto test.

dyno test

What kind of test is that? (the technic, not the instrument)

Ramsie · 06 Apr 2004, 10:12 pm

Im not exactly sure, I know a few people that have been on the dyno (with some pretty impressive numbers!) and ill ask them. After I get my nitrous oxide hooked up im going to see what kind of numbers I can pull off, and also get it tuned.

Im expecting to put down somewhere around 470 with a 100 shot, im going to get tuned for 120 or 150 though

JohnnyWash1 · 08 May 2004, 08:25 pm

A dyno run is done completely through one gear, usually the gear closest to a 1:1 ratio. Without a perfect 1:1, the computer software will have to perform one more calculation to get your real number---not a big deal; it is simply preferred to rely less on a computer. The test computes how much torque, at the wheel, your car is producing. This, in turn, is converted to HP, since HP is just a function of torque. At that point, you have the hp and torque of your engine, measured at the wheels. Keep in mind that your car's driveline will absorb some of this power simply operating; this is referred to as parasitic loss. Basically this is just the power associated with spinning things like your flywheel, driveshaft, transmission, axle..etc. This is why a car will measure lower hp at the wheel than the engine is actually making. One last thing to remember--there are several different brands and types of dynos, but really only two categories--chassis and engine. A chassis dyno is what all of your friends are using and is the one I am discussing. It measures hp at the wheels. An engine dyno is what manufacturers and some tuners use to measure hp at the flywheel--this is done by testing an engine outside of the car, hooked up to no driveline.

Jon

JohnnyWash1 · 08 May 2004, 08:26 pm

Feel free to ask questions--I was too tired to type more.

Jon

Gilly · 09 May 2004, 12:08 am

Some good info there, thanks Johnny and it pretty much expains it for me

18 Mar 2004, 04:03 am	#1 (permalink)
Gilly Fanatic Tremekian Join Date: Feb 2004 Location: UK Posts: 725 Gilly's Gallery	Dyno testing??? Yes I could search the net but I'd rather get the insight of people here and this place needs more tech talk so... Can anyone please give me an explanation of how you run a car whilst dyno testing? Do you run from a certain RPM in a certain gear, or do multiple passes in multiple gears and then get an average? what does the test show? just BHP and Torque? Thanks

06 Apr 2004, 10:12 pm	#3 (permalink)
Ramsie Fanatic Tremekian Join Date: Apr 2004 Location: Anniston,AL Posts: 788 Ramsie's Gallery	Im not exactly sure, I know a few people that have been on the dyno (with some pretty impressive numbers!) and ill ask them. After I get my nitrous oxide hooked up im going to see what kind of numbers I can pull off, and also get it tuned. Im expecting to put down somewhere around 470 with a 100 shot, im going to get tuned for 120 or 150 though __________________ Corvette - Born to race, Bred to win 1999 Chevrolet Corvette FRC - Bolt-On+150NX : Torch Red (G5x3 Cam,AFR 205 Heads,LG LT Headers w/Cats,LS6 Intake Manifold - coming soon - 600rwhp+ 2001 Chrysler Prowler : Prowler Pearl Orange 2004 Nissan 350Z Roadster : Le Mans Sunset Orange 1992 Ford Ranger : Black & Scratched

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03 Apr 2004, 06:59 am	#2 (permalink)
Pa231 Young Noob Join Date: Mar 2004 Posts: 50 Pa231's Gallery	I have a question too about dyto test. dyno test What kind of test is that? (the technic, not the instrument)

08 May 2004, 08:25 pm	#4 (permalink)
JohnnyWash1 Fanatic Tremekian Join Date: Apr 2004 Posts: 752 JohnnyWash1's Gallery	A dyno run is done completely through one gear, usually the gear closest to a 1:1 ratio. Without a perfect 1:1, the computer software will have to perform one more calculation to get your real number---not a big deal; it is simply preferred to rely less on a computer. The test computes how much torque, at the wheel, your car is producing. This, in turn, is converted to HP, since HP is just a function of torque. At that point, you have the hp and torque of your engine, measured at the wheels. Keep in mind that your car's driveline will absorb some of this power simply operating; this is referred to as parasitic loss. Basically this is just the power associated with spinning things like your flywheel, driveshaft, transmission, axle..etc. This is why a car will measure lower hp at the wheel than the engine is actually making. One last thing to remember--there are several different brands and types of dynos, but really only two categories--chassis and engine. A chassis dyno is what all of your friends are using and is the one I am discussing. It measures hp at the wheels. An engine dyno is what manufacturers and some tuners use to measure hp at the flywheel--this is done by testing an engine outside of the car, hooked up to no driveline. Jon

08 May 2004, 08:26 pm	#5 (permalink)
JohnnyWash1 Fanatic Tremekian Join Date: Apr 2004 Posts: 752 JohnnyWash1's Gallery	Feel free to ask questions--I was too tired to type more. Jon

09 May 2004, 12:08 am	#6 (permalink)
Gilly Fanatic Tremekian Join Date: Feb 2004 Location: UK Posts: 725 Gilly's Gallery	Some good info there, thanks Johnny and it pretty much expains it for me

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