MAP sensor placement
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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).
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.
MAP sensor placement
I am having trouble finding a place to put the controller under the dash of my car. Just not enough room and still be accessible. I am thinking of putting in the trunk. First of all, an pros and cons of putting it in the trunk? Second of all, with that long of distance between the MAP sensor and the engine, will response time or distance be an issue? Would it be better to place the sensor on or close to the engine and run wires back to the controller?
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obxer
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From the manual - right under the MAP sensor info:
Had this worry myself - ended up putting my Microsquirt behind the passenger seat.Don't worry about how long your MAP sensor vacuum hose is. Intuitively it seems that shorter should be better. However, a few people have done tests to see how bad the effect of a long hose was on vacuum signal propagation. With a ~100 foot (~30 meters) coil of rubber tubing in between the MegaSquirt® and the engine, the result was that no delay was apparent. This was with about a 10 millisecond resolution clock. The reason for this is that air has so little inertia that it moves very quickly in response to a vacuum (this is how we fill the cylinders, after all!).