Speeduino vs microsquirt for e85 build?
TECH Regular
Joined: Sep 2014
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A little about Elton Johns Jacket...
In all the reading and research I've done on sequential vs. batch fire, it seems the benefits of sequential are minimal until you get into individual cylinder tuning. And even the benefits there aren't substantial, it's just not an option that's available with batch fire.
Outside of individual cylinder tuning, the main benefits of sequential injection seem to be the ability to achieve a leaner idle AFR and slightly better emissions in the lower/cruising rpm's.
If you can live with a slightly rich idle, slightly elevated emissions at cruise, and wont ever take the time to put an O2 sensor in every exhaust runner to squeeze every last bit of power out of her on a multi day engine dyno session... don't pass on a MicroSquirt just because it's not "sequential". If it otherwise suits all your needs, sequential isn't any sort of thing worth the price to say you have it.
In all the reading and research I've done on sequential vs. batch fire, it seems the benefits of sequential are minimal until you get into individual cylinder tuning. And even the benefits there aren't substantial, it's just not an option that's available with batch fire.
Outside of individual cylinder tuning, the main benefits of sequential injection seem to be the ability to achieve a leaner idle AFR and slightly better emissions in the lower/cruising rpm's.
If you can live with a slightly rich idle, slightly elevated emissions at cruise, and wont ever take the time to put an O2 sensor in every exhaust runner to squeeze every last bit of power out of her on a multi day engine dyno session... don't pass on a MicroSquirt just because it's not "sequential". If it otherwise suits all your needs, sequential isn't any sort of thing worth the price to say you have it.
TECH Regular
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On a V8, the Micro has no option but to run Batch Fire Injection and Wasted Spark Ignition, so there's no use for the cam position (VR2) input. So, there is the capability in/of the hardware to do boost by gear. However I don't know if it's a function that's actually available in Tuner Studio for the Micro or not.
There are spare outputs. But again, I don't know if the functionality is there in the software for a bump box or not.
So, all those "could" be possible. However, it does come down to choosing one thing over another... Because, yes, there are limited inputs and outputs left, beyond the bare minimum needed to run the engine. Do I want this function or that function? If ya don't want to have to make those choices, don't get the Micro.
The difference between a micro squirt and ms3x is 350$
How is this even a discussion?
Even if your ENTIRE build is ebay/china, 650$ is still only a fraction of the cost of whats invested.
And then you dont have to pick and choose what functions you want
And you can have idle control, which seems to be conveniently over looked in this thread. LOL
How is this even a discussion?
Even if your ENTIRE build is ebay/china, 650$ is still only a fraction of the cost of whats invested.
And then you dont have to pick and choose what functions you want
And you can have idle control, which seems to be conveniently over looked in this thread. LOL
TECH Fanatic
Joined: Oct 2015
Posts: 1,280
Likes: 28
From: Pittsboro, IN
The difference between a micro squirt and ms3x is 350$
How is this even a discussion?
Even if your ENTIRE build is ebay/china, 650$ is still only a fraction of the cost of whats invested.
And then you dont have to pick and choose what functions you want
And you can have idle control, which seems to be conveniently over looked in this thread. LOL
How is this even a discussion?
Even if your ENTIRE build is ebay/china, 650$ is still only a fraction of the cost of whats invested.
And then you dont have to pick and choose what functions you want
And you can have idle control, which seems to be conveniently over looked in this thread. LOL
TECH Addict
Joined: Oct 2016
Posts: 2,513
Likes: 480
From: PDX-OR-USA
I have a 4cyl jeep wrangler, mildly built, the stock ECU is 350 bucks rebuilt WHEN it fails, the Micro is the perfect solution for me, since the fail mode on the stock ECU fails the injector driver most often, just add the Micro and let teh stock one run the check engine light and tach... 
Not to mention the stock ECU uses calculated data not tables off the TPS / MAP / TEMP /O2, and runs rich as hell stock, its a easy decision. Now if it was FI'd and more maybe the MS3 would be the better pick.. But for now it will get me a double win, cost about the same as stock and works better.
Oh and Sprint cars on mechanical injection do OK in "Batch fire" mode on the injection.. Yea they dont idle but when would I idle a sprint? LOL
Not to mention the stock ECU uses calculated data not tables off the TPS / MAP / TEMP /O2, and runs rich as hell stock, its a easy decision. Now if it was FI'd and more maybe the MS3 would be the better pick.. But for now it will get me a double win, cost about the same as stock and works better.
Oh and Sprint cars on mechanical injection do OK in "Batch fire" mode on the injection..
Yea they dont idle but when would I idle a sprint? LOL TECH Regular
Joined: Sep 2014
Posts: 433
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The difference between a micro squirt and ms3x is 350$
How is this even a discussion?
Even if your ENTIRE build is ebay/china, 650$ is still only a fraction of the cost of whats invested.
And then you dont have to pick and choose what functions you want
And you can have idle control, which seems to be conveniently over looked in this thread. LOL
How is this even a discussion?
Even if your ENTIRE build is ebay/china, 650$ is still only a fraction of the cost of whats invested.
And then you dont have to pick and choose what functions you want
And you can have idle control, which seems to be conveniently over looked in this thread. LOL
Otherwise, why pay more for functionality you're not going to use or don't need? The cost to upgrade is an *** load of cash to pay for nothing.
IAC has been mentioned a few times. In stock form the MicroSquirt is capable of operating a PWM style valve, but requires an additional $60 external box to operate a GM stepper idle valve.
And idle control can be achieved through ignition timing and the Adaptive Idle Control feature... which was also mentioned.
I'm aligned with your thinking for my personal project, even though I went the MicroSquirt route. I wish I had more functionality. However, it would be rather ignorant for me to blanket the needs of all the world with my personal needs and narrow point of view.
If someone asked me what I'd get the next time around. MS3 Pro. If someone asks me what I think they should get, I'd ask them what their needs are. If the Micro covers it, I have no problem recommending it. The Micro is a very capable unit for a ton of applications.
The LS modded Micro with generic wire harness is $400. The Gold Box with generic harness is $950. More than twice the cost.
Doubt you'd pay $3k+ for an ECU, when you could get what you need from the $1500 unit you're eyeballing. But, maybe you would? Nothing wrong with that.
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even if I dont use micro/mega or this new thing ( or FI tech for that matter) i am glad they are there.