SuperMID revisited

[Matt Timion]

Originally Posted by SVOboy

It takes one injectors signal and multiplies it by four, but I'm sure this can be corrected in the fuel parameter to account for three or even one injector, but I'm not to sure how flexible it is.

My understanding is that you calibrate the supermid to a certain distance. This essentially means that as along as some observable injector pulse is there the supermind can be calibrated correctly to your engine.

[krousdb]

Originally Posted by Matt Timion

My understanding is that you calibrate the supermid to a certain distance. This essentially means that as along as some observable injector pulse is there the supermind can be calibrated correctly to your engine.

A message from your local SuperMID Technical support geek.....

Nooo Matt. There are two inputs, injuctor pulsewidth and distance. Each one has to be calibrated by adjusting the fuel parameter or the distance parameter.

There is enough range in the distance parameter to accommodate just about any tire size, so long as your VSS output meets the industry standard. So far we know that Toyota and Honda use that standard.

As for the fuel metering, that is more problematic. The SuperMID measures one injector and multiplies the result by four, same as the OEM Prius instrumentation does. The mid range of the fuel parameter adjustment is approx equivalent to a 190cc Honda injector X four cylinders. There is enough range to accommodate a 240cc Honda injector and possibly up to a 300 cc injector. Likewise, if a 3 Cyl Metro uses something similar to a 190cc injector, the possibly there is enough range to calibrate the MID even though you have three cylinders.

As for DFPI and TBI, I doubt that you would get accurate numbers. But you would still get numbers that can be converted manually to a FE value. Like I was saying earlier, the MID can be used as a fuel meter. The value returned may not be in liters or gallons, but a value nonetheless. Yes, it is a hassle to convert, but it is better than nothing.

[Matt Timion]

Originally Posted by krousdb

A message from your local SuperMID Technical support geek.....

Nooo Matt. There are two inputs, injuctor pulsewidth and distance. Each one has to be calibrated by adjusting the fuel parameter or the distance parameter.

This seems a bit too complicated for me.

In theory, you can hook it up to one injector wire and the vss. You could then calibrate it on distance (drive 130 miles, etc. and then tell it how far your drove) and fuel (burn through X number of gallons and then tell it how much fuel you used). It could then determine the correct pulse duration for both the VSS and the injector wire. This would be independant of number of cylinders, engine size, tire size, etc.

Mulitplying by four automatically discounts vehicles like the Insight, all 88-91 DPFI hondas, 3 cylinder Geo Metros, etc.

Then again it's important to remember the origins of the SuperMID, which was originally designed to work only for the Prius and not as a universal application.

[Gary Palmer]

From the way you are describing the SuperMID, I don't think it would work on the DPFI system, on the Honda's. From what I've read it sounds to me like the Honda uses one of the injector's as the primary and one of the injector's as a supplementary one, for when you have the throttle more open. It sounds like the SuperMID presumes that all of the injector's are open for the same duration.

Do you have any idea what type of a signal is generated for the speed on the Geo?

[Matt Timion]

Originally Posted by Gary Palmer

From the way you are describing the SuperMID, I don't think it would work on the DPFI system, on the Honda's. From what I've read it sounds to me like the Honda uses one of the injector's as the primary and one of the injector's as a supplementary one, for when you have the throttle more open. It sounds like the SuperMID presumes that all of the injector's are open for the same duration.

This is exactly right. The Honda DPFI system is more or less a carburator with fuel injectors. It fires one injector for all four cylinders under normal conditions. If the SuperMID read this information and then multipled by four it would be equivilant to a 16 cylinder engine (4x4). That's just not going to work.