Dyno Dynamics

Nissan GTR: Saw Tooth Oscillations On High resolution graphs due to 4WD clutch cycling

When testing Nissan GTR 4WD/All wheel drive vehicles, I sometimes get saw-tooth wiggles on the tractive effort and power graphs.

• What sort of things should I look for, or check?
• How do I answer my customer, who has been told that it's a fault in the dynamometer?

Auto Graph SnapShot Settings

I would like the dynamometer to press the SnapShot button for me automatically every 5 km/h or 200 rev/min when I am graphing.

• How do I turn this feature ON ?
• How do I select RPM or road speed as the interval?

Cooling Fan belt adjustment

The cooling fan belt squeals on startup,

or

The cooling fan vibrates on startup.

• How do I adjust the drive belt?

Cooling Fan electrical connection

The fan only blows a small amount of air since electrical work has been carried out at my premises,

or

The fan only blows a small amount of air since new.

• How do I fix this?

Searching for graphs

I have drawn graphs for this vehicle.

• How do I find them, view them and print them?

AFR Probe types

I have heard of UEGO AFR sensors.

• How do they differ from standard sensors?

Inertia: How it affects dynamometer readings

I know that the size of the vehicle flywheel affects performance but not power.

• How do I tell the dyno what the vehicle drive-train inertia is?
• How do I measure vehicle drive-train inertia?

Holden Independent Rear Suspension

I don't usually experience traction problems or rubber with most vehicles, but even low powered IRS equipped vehicles can sometimes produce rubber.

• How do I fix this?

Editing existing Logos

Our company details have changed.

• How do I change my logos to suit?

Low Boost

Frequently the maximum boost achieved on the dynamometer is less than the boost achieved on road.

• What causes this?
• What can I do to reduce this effect?

Marketing your Dynamometer

I want to get more work for the dyno. I want to use the dyno to promote my business.

• I could do with some suggestions on how to use the dyno to improve my business.

Changing Dynamometer maximum speed in Ramp Mode and optionally, in Speed Mode

The dynamometer maximum speed limit is not high enough for graphing.

• How do I change this?

Noise and the Neighbors

I am planning to install a chassis dynamometer.

OR

I am thinking of moving my chassis dynamometer operation to a new location.

• One new neighbor has asked me what sort of noise levels he/she can expect.

Phase 2 to Phase 3 Upgrade

I am going to upgrade my old Phase 2 dynamometer control system, to the latest Phase 3 system.

• What do I get?

Power Correction

I have (in the past) made power measurements on a particular engine under one set of atmospheric (or other) conditions, and now wish to compare these results under a different set of conditions.

• How can the dynamometer help?
• What limitations are there?

Power Variation between runs

I ran this vehicle earlier/yesterday/last month, and measured the power. I have tested again today with no apparent changes to the vehicle, and the power is different.

• What sort of things should I look for or check?