Megasquirt mounting location, where? Options

[yarin]

For you MS guys using a relax box where did you mount the brain?

I bought the 12' unterminated relay cable from DIYautotune. I'd like to mount the box under the dash, but 12' isn't enough to reach. I mounted my relay box next to the stock relay box. I'll measure again tomorrow, but i'm pretty sure it wont make it.

Where did you guys mount your MS box? I thought about mounting it in the middle of the firewall between the two seats, but I don't want to expose it to direct sunlight. I know the compnents on MS II are OK to higher temps, but I see no reason to expose it to high temps. My next idea was to mount it inbetween the seats on top of the tunnel. But I know that the when someone releases a 5 pt harness one of the belt is going to smack the unit.

Any other ideas?

[lapuwali]

I have a partially assembled MSv2.2 on my workbench that has no output drivers. I was planning on using it for data acquisition, since it will talk to MT and sensors right now (and I'm buying a v3.0 board). I'm going to use a few thermistors and measure: the rear trunk, inside the stock ECU box, and the relay board area while driving around with carbs on the car. Unfortunately, I'll be unlikely to see air temps above 25dC while I do this, since it rarely gets hotter than that here until after I hope to start my MS conversion.

Mark Henry is running his SDS ECU insided the stock ECU housing, with good results. I am, right now, leaning towards doing the same thing with MS. The stock box can be adequately sealed from the weather, and it's already been shown that the front of the engine bay doensn't get anything like as hot as the rear of the engine bay or the rear trunk. Mark has also logged inlet air temps of 50dC on a hot day (high 30s C), so my guess is the temps inside the stock ECU box won't rise above that, which is well below the 70-85dC limit for MS1, and way below the 125dC limit for MS2.

A few minutes with a $2 thermistor and a multimeter should give you some idea of how hot the front of the engine bay gets while your car is running. My 914 doesn't run right now, or I'd do this myself.