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What's so great about the MIMA modification?

1439 Views 2 Replies 3 Participants Last post by  Double-Trinity
After driving approximately 2,000 miles with the MIMA modification, I can say without reservation that this feature has exceeded expectations, and that for me, the “novelty” hasn’t yet worn off. In fact, I don’t think it ever will :) .

Those of you who’ve been waiting patiently for the MIMA modification will hopefully soon wonder how you’ve ever lived without it.

My driving habits are basically conservative with regard to fuel consumption. However, it’s been a great adventure to develop a new approach to driving that involves selecting the mode of operation, a joystick that controls the level of assist and regeneration, and additional attention to operating parameters, specifically engine RPM, battery current, speed, and battery temperature. This isn’t necessarily easy on busy highways and in gridlock traffic, but eventually, with practice, it becomes more familiar.

Except in extreme weather conditions, when the MIMA mode is not necessarily useful, the daily commute with this modification is never boring. Initially, I activated the MIMA mode approximately 20% of the time. Now, it’s activated approximately 80% of the time.

With fuel prices increasing these days, my colleagues are increasingly curious about Sputnik’s fuel economy. While most could only wish for 50+ mpg, my consistent 90+ mpg, when not an initiator of disbelief, is an increasingly common subject of discussion around the water cooler.
With mounting evidence of auto emissions being a contributing cause for global warming, a relatively simple modification that provides a 15%+ improvement in fuel economy seems like a moral imperative.

While I don’t really fit into the “boost head” category, I’ll admit to the occasional urge to demonstrate to the driver of an adjacent behemoth who casts a condescending glance at the stop light, just what 10+ kilowatts of additional power can do in a lightweight vehicle such as the Insight.

It seems as though one of the greatest reservations about installing this modification has been apprehension about premature battery pack failure. I’m still not without such apprehension. However, despite the ability to apply over 100 amps of assist, and over 60 amps of regeneration current, I mostly limit the assist to 60 amps, and the regen to 40 amps.
Since installing the modification, I’ve had only 2 negative recalibrations. Considering the preceding driving conditions in both cases, neither of these were a total surprise.
By having control over assist and regen, and ultimately the state of charge, all while monitoring battery temperature (affected by climate, parking conditions, and usage) I now have much less apprehension about premature battery pack failure than I did before installing the MIMA modification.
In the case of the “other” MIMA modified Insight, it seems remarkable how the battery pack continues to survive in apparent perfect condition, despite extreme cycling during development, test, and “high performance” :twisted: driving.
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Good comprehensive post in regard to MIMA, fun, and fuel efficiency. :)

The old racer's adage:

"Speed costs money. How fast do you want to go :?: "

is what comes to my mind in this situation. I more than suspect that IMA pack life *IS* being reduced with _anything_ that is more "aggressive" than "stock".

Just as long as you install with MIMA with your eyes wide open... :shock:

HTH! :)
The main reason something like this would appeal to me is so that it would be possible to kill "forced charging" and only recapture energy when I want to with regen, rather than leeching power from me when I'm cruising to make up for assisting to get up to speed. I'd probably discharge the pack not much, if at all, more than I do on the current drive, but by doing so strategically I bet I could get a several more MPGs from my Civic. This is especially true when going up the hill I live on. The car starts to force-charge just before I reach the top, whcih is unfortunate as I generally charge the battery to capacity on the way back down as it is. I suspect the reason why force-charge is done is so that full power will always be available in case of an emergency, but when I'm cresting a hill in a residential neighborhood, I know I won't need battery reserve so I can "floor it." It should be enough to just not use the pack any more until the trip back down. It's cases like this where an MIMA with a skilled driver will always outperform any pre-programmed algorithm.

For city driving, this would help as well, just to give me a bit of an extra boost for getting off the line from the battery without revving the engine as high. I could then have a more aggresive "regen" as I coast to a stop at the next light. I personally don't like to hold up traffic with long dragged out accelerations just to save fuel, unless the road is empty. (although there is merit to a lot of the hypermile tricks, if every single car on the road accelerated at a crawl and kept tons of space from each other, traffic flow would be much more congested than it already is)

[moderator edit to prevent un necessary thread "bump" up the list]

For those interested in the MIMA project or those still wondering what it is the threads have become too fragmented for the developer to maintain and he has requested that his other MIMA threads be locked.

Please understand that any further suggestions for design changes will not be honored since the process is too far along. However, since its *opertation* can be easily modded in software such limited opinions will be welcome.

A few of the old threads that will most likely answer all your questions are here:

Hybrid controls and the MIMA project ... php?t=2471

Mima Statue Update ... php?t=3176

MIMA L works in a CVT (automatic circuitry with foot pedal) ... php?t=3233
(Moderators note: the newest version of MIMA is CVT compatible)

MIMA Display and Joystick Housings ... php?t=3353

The developers site is here:

Its a complex topic and modification. And one that should be carefully reviewed if your deciding on purchase. The purchase thread is here: ... 9&start=15

The subject is still open for discussion at the developers selected for consolidation thread here: ... php?t=3357

Locking other threads. Future MIMA threads will be locked and follow-up's directed to the thread above.

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