Q&A Forum
hi
rpm input ?
i currently use a rpm converter on my DTEC inertia dyno
i can read rpm from spark plugs
coils
read from ecu also
if your just using roller as main rpm input ,, slippage... cause bhp/torque/rpm/ time error
what system as rpm engine input is your dyno using
ps.
multi spark per rpm ...eg harley fire twice in 1 rpm
Hi,
The system uses roller RPM only. You need to either enter the gear ratio or let the system calculate the gear ratio, from there you get engine RPM.
ive used on my old dyno an inductive clamp for rpm. you can use obd for take rpm too but i when i tested some cars with a lot of tracction losses, it Will not worth as test, on yourdyno i asume Will make a weird pull dyno sheet but anyway if you have good rpm Reading and you still have traction losses problems, you cant get a good test. i think i Will be worried first to get all cars dont loost traction for get better readings on the dyno.
Hi
Wheel spin
Www.bike-dyno.com.au
Is my mobile motor cycle dyno
I use an Australian system Dtec version 2
Has lot features
Can plot wheel spin. Vs roller rpm/ tourque
I have spend many hours / months bug fixing this system
Your dyno
Best feature is able to control a load cell ... eddy current
I'm tying to justify the $1000 aud
Yes, lots of requests for using one RPM input for engine RPM and the other for roller RPM. It is next on the to-do list, just very busy times now.
will this issue be addressed on version 4 to use engine as well as wheel speed rpm
Yes. It is just a software update.
Brilliant the addition would make this even more accurate
Dtec gauges/graphs screen display look awesome but Darren no long does dyno load control Darren only sells inertia dyno software/hardwre his main guy who did the electronics hardware and software suddenly passed away.
Yes. It is just a software update.
What speed sensor would do you recommend
Would be nice just to interface on the ignition coil negative side and inform the siftware what it is reading ( ie different ignition systems 2,3,4,5,6,,,,,12 cylinder engines, waste spark so on. ) so it graphs side by side with differential speed and engine RPM.
I agree it nice with a feature to input wasted spark, etc. I will include this.
The signal that is connected to YourDyno must be a 0-5V signal. There are a few options.
- It can come from the primary side of the coil (12V) with a simple 5.1V zener + 1k resistor circuit to convert to 0-5V.
- Hall effect sensors like the one used by YourDyno can also detect current pulses, so it may be possible to just tape a standard YourDyno sensor to the spark plug wire. I will test a bit.
- Lots of ECUs have a tach output that you can connect to.
- Anything else that produces a 0-5V signal with a frequency that follows the engine speed.
just asking..it's not posible to convert using rpm signal to show speed? with rpm and gear ratio it's not posible maybe?
I agree it nice with a feature to input wasted spark, etc. I will include this.
The signal that is connected to YourDyno must be a 0-5V signal. There are a few options.
- It can come from the primary side of the coil (12V) with a simple 5.1V zener + 1k resistor circuit to convert to 0-5V.
- Hall effect sensors like the one used by YourDyno can also detect current pulses, so it may be possible to just tape a standard YourDyno sensor to the spark plug wire. I will test a bit.
- Lots of ECUs have a tach output that you can connect to.
- Anything else that produces a 0-5V signal with a frequency that follows the engine speed.
Like you said ,Yes nearly all(most) vehicles have a tacho out in the engine bay and understand its a 12Volt need to be stepped down to a 5 volt signal to interface with yourdyno hardware.
The issue i see using " Hall effect sensors like the one used by YourDyno can " with a lot of cars/motorcycles and engines the spark plug wires which are hidden under manifolds and covers and not to mention the coil_on_plug arrangements on a lot of cars too, which are difficult to access.
Be nice if you could somehow canbus the OBD2 into the yourdyno on one of the inputs.