Hello!
I am using MS 2 with an EDIS 4 setup; I was using pin 2(IDM) on the EDIS module to drive my Autometer Shift-Lite tach - but at 7500 rpm the needle starts to flicker heavily. So I tried pin 11 (should be the CTO) of the module to see if there is a difference - but there wasn't one at all!
On the datalogg I can see the engine is reving to (the set) rev limit at 8000 perfectly - no spikes or errating readings.
(Maybe the IDM and CTO port of the module are connected internal?!; maybe there is a built in "engine failure signal" from the module to the OEM ECU - because I guess in OEM applications they never reved to 7500+rpm....)
So my question: Can I add my tach signal input cable to the PIP signal cable which is a perfect square wave signal up to 8000RPM?
Thanks!
Harry
EDIS4 - tachometer goes mad at 7500RPM
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Read the manual to see if your question is answered there before posting. Many users will not reply if the answer is already available in the manual.
If your question is about troubleshooting, configuration, or tuning, you MUST include your processor type (MS-I or MS-II) and code version in your post. If your question is about PCB assembly or modifications, you must also include the main board version number (1.01, 2.2 or 3.0). For tuning/troubleshooting questions, please attached a datalog and your MSQ file to your post.
If you have questions about MS1/Extra or MS2/Extra code configuration or tuning, please post them at www.msextra.com Such questions posted here will be moved to: a temporary MSextra sub-forum, where they will be removed after 7 days
The full forum rules are here: Forum Rules, be sure to read them all regularly.
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Turboharry
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Re: EDIS4 - tachometer goes mad at 7500RPM
Driving the tacho from EDIS PIP is OK, as long as you check the load.
Scope the PIP wire and note the amplitude, should be > 10 Volts.
Then add the tach wire and recheck amplitude, should still be > 10 V,
but the tacho may well load it down.
If so, fix a simple emitter follower and drive that from the PIP, the input
impedance on a typical 2N2222 emitter follower is > 25 kOhms and
that will settle the issue.
Heribert
Scope the PIP wire and note the amplitude, should be > 10 Volts.
Then add the tach wire and recheck amplitude, should still be > 10 V,
but the tacho may well load it down.
If so, fix a simple emitter follower and drive that from the PIP, the input
impedance on a typical 2N2222 emitter follower is > 25 kOhms and
that will settle the issue.
Heribert
If it is not understood , it will not work!
-
Turboharry
- MegaSquirt Newbie
- Posts: 2
- Joined: Wed May 14, 2008 7:12 pm
- Location: Austria
Re: EDIS4 - tachometer goes mad at 7500RPM
Hi Heribert,
thanks for the reply; the problem is I don't have a scope and I am not an "elecronic guru".
Do you have a schematic for me how to connect the transistor?
Would it maybe also work to add just a resistor(poti) on the input side of the tach to put the load down, but still let enough signal through to drive the tach?
Harry
thanks for the reply; the problem is I don't have a scope and I am not an "elecronic guru".
Do you have a schematic for me how to connect the transistor?
Would it maybe also work to add just a resistor(poti) on the input side of the tach to put the load down, but still let enough signal through to drive the tach?
Harry