Dyno Experts, Please Stand Up...

[Grady Clay]

Don,

Thanks for the reference. A few clicks and a copy will be at my local branch library tomorrow (CARL is wonderful). I’ll post a review.

Plint, Michael and Anthony Martyr
Engine Testing Theory and Practice
1998, Butterworth Heinemann Publisher
ISBN 0750640219, US$74.95

Poking around I found this data acquisition system. This would work well with my Stuska dyno.

Here is a good knock analyzer for the dyno.

Even better engine analyzer can be found.

Best,
Grady

[donporfi]

Hey Grady:
If you are in the market for an engine or chassis dyno with data acquisition system, check this company: www.schenckpegasus.com
But beware, with the cost of a complete test cell you can buy several Carrera GTs.

[ssetek]

Originally posted by H20911
Many things are compensated for. As far as mech advantage of lower gears (higher final drive ratio). The dyno will comp for that because it will accel. faster but have topped out quik. So the time ran in the range will be less.
In other words a car that has (old chevy) 4.56 gears will not show better than a car with 3.73 gears all else being equal.

As side note I am not a fan of roll on dynos because they slip and you can come off if not strapped tight enough.

I have a nice Mpeg of a buick grand national that is smoking the tires on the roller so I know that the final numbers are off.

Here is mine on the rack. Did it run? No, because the rear bumper was off and the guy at the shop did not feel good at running wide open in 4th gear with out good cross strapping to hold it on.




I did not feel good about it either.
The next time if I can't bolt to the axle I won't go.

i have a dyno dynamics dyno and it will compensate for inlet air temp --probe inserted into coupler at throttle body-- , air desity, --inputed from weather station at time of runs-- , humitity --also from weather station-- , ambient air temp -- again weather station-- , drivetrain inertia --calculated from a loaded ramp up and then pull down from dyno-- , runs on saddled 8.5 in rollers that weigh 85 lbs not the typical 4k to 6k that dynojet and mustang dynos use so tourque numbers are realistic not skewed by the inertia of the rolling drum, as far as slippind goes we just had a dyno day and we had a 1575 hp chevy truck that put down 827 on motor and 2 stages of 500 hp nitrous with no wheel slip only on our traction bar stap setup which consists of 2 big straps and we used 2 small ones for saftey and thats it, no crazy cross straping and like 20 sets of straps and still have wheelslip, threr is allot of misinformation on dynos out there,

here a pick of our dyno the bar that runs arround the back of the car holds the strap system 2 staps run under the car over the axle or bannana arm and attach to that bar and thats it.

[Grady Clay]

Don,

That link crashed my MSN com program. What’s the deal?

Best,
Grady

[camgrinder]

Grady,
What advantages do the Hi-techniques system have over the Depac stuff?

[89911]

I posted a good article a while ago that had some pertinent info:

Is your dyno lying?

[donporfi]

Grady,
Sorry you had problems with the link. I do not why. That site has been on the internet for years now.

[bkreigsr]

the last scca autox I did, there was a portable dyno on a truck.

part of his printout included a time & speed for the 1/4 mile.

can they do that with any sort of accuracy when they are not taking into consideration vehicle weight and coefficient of drag?

Bill K