99-00, 01-05 and MSM Megasquirt MS2 DIYPNP "Enhanced" group buy
10-12-2010, 07:47 AM
#321
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I would like a mspnp for my 04 msm but what needs to be done to switch over to cop in the near future?
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10-12-2010, 03:20 PM
#323
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Another update.
Boy am I glad I tested the MSM unit on my car! The reason why the A/C wouldn't work on my car? Get this: there was crosstalk (interference) between the high-speed idle valve signal and the tacho input on the board. The result? As long as the idle valve was plugged in, my board would read outrageous RPMs, like 10-15K. Unplug the idle valve and all was good. So the A/C wasn't engaging because it thought that the engine was doing 10K RPMs and didn't engage the A/C to protect the compressor.
The reason why this didn't show up on the test bench? Instead of an idle valve, the stimulator I made uses a 1K resistor and a LED to indicate activity. Given 14V, that gives us 14mA of current - nothing interesting. On the other hand, the idle valve has a combined impedance of about 10 Ohms - that works out to 1.4 amps. That's strong enough to create interferance on nearby circuits - the tacho in circuit in this case.
That illustrates the importance of testing on a car, which I'm glad I did.
I swapped the tacho in circuit with the PSP circuit that isn't cross-talk sensitive (it's pulled high to 12V) and all is good now - the A/C works and the RPMs are correct. I'm going to do the mod on the rest of the ECUs and I'm shipping the first batch tomorrow.
Thank you guys for being so nice to me, I'm really hoping you'll enjoy these units.
Dimitris
Boy am I glad I tested the MSM unit on my car! The reason why the A/C wouldn't work on my car? Get this: there was crosstalk (interference) between the high-speed idle valve signal and the tacho input on the board. The result? As long as the idle valve was plugged in, my board would read outrageous RPMs, like 10-15K. Unplug the idle valve and all was good. So the A/C wasn't engaging because it thought that the engine was doing 10K RPMs and didn't engage the A/C to protect the compressor.
The reason why this didn't show up on the test bench? Instead of an idle valve, the stimulator I made uses a 1K resistor and a LED to indicate activity. Given 14V, that gives us 14mA of current - nothing interesting. On the other hand, the idle valve has a combined impedance of about 10 Ohms - that works out to 1.4 amps. That's strong enough to create interferance on nearby circuits - the tacho in circuit in this case.
That illustrates the importance of testing on a car, which I'm glad I did.
I swapped the tacho in circuit with the PSP circuit that isn't cross-talk sensitive (it's pulled high to 12V) and all is good now - the A/C works and the RPMs are correct. I'm going to do the mod on the rest of the ECUs and I'm shipping the first batch tomorrow.
Thank you guys for being so nice to me, I'm really hoping you'll enjoy these units.
Dimitris
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10-12-2010, 04:10 PM
#325
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Dimitris, you're nothing short of thorough! Excellent find regarding the noise btw.
I saw earlier that you wrote about testing the 99-00 units on a 1.6. Electronically (in terms of ECU and ancillaries) are these identical to the 1.8 in the 99-00 cars? I can't think of anything so I'm amusing they are.
I saw earlier that you wrote about testing the 99-00 units on a 1.6. Electronically (in terms of ECU and ancillaries) are these identical to the 1.8 in the 99-00 cars? I can't think of anything so I'm amusing they are.
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10-12-2010, 04:31 PM
#326
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Yes, the 1.6 is exactly the same as the 1.8 as far as electronics are concered. This 1.6 was just turboed, so there was no refrigerant in the A/C piping - hence the A/C wouldn't work anyway. The battery light WAS flashing with the engine off, which led me to believe at the time that this particular car was just having a bad battery - if your car is is giving less that 10V with the engine off, the battery light will flash slowly to alert you to this fact. The truth is that the circuit was (falsely) reading RPMs, so it was thinking that engine was running but the alternator wasn't charging - so it was flashing to let you know. Now that it doesn't read RPMs with the engine off, it remains lit until the engine catches.
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10-12-2010, 04:33 PM
#327
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Any ETA on the VVT add on
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10-12-2010, 04:37 PM
#329
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10-12-2010, 04:41 PM
#331
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Either way if I am spending money for a stand alone I want VVT. I will say I am loving the work you have done so far. You are very skilled
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10-12-2010, 08:03 PM
#333
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10-12-2010, 09:09 PM
#335
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Sorry for the slight thread jack, but I should hopefully have my car up and running early next week and should be getting on of the first VVT controllers for testing very shortly after that. I will also be getting tuned at DIY and I will be posting my results as soon as they happen.
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10-12-2010, 09:32 PM
#336
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Looks great!
It's coming together. We are anticipating the first 50 units available at the very end of next week. Feel free to start a new thread if you want more details on it; I don't want to muddy this one up.
It's coming together. We are anticipating the first 50 units available at the very end of next week. Feel free to start a new thread if you want more details on it; I don't want to muddy this one up.
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10-12-2010, 10:54 PM
#337
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Will these units come boxed (like PnP units) or do they need a box either?
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10-13-2010, 04:42 AM
#340
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Wow! They look great Dimitris.
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