future Microsquirt conversion????

toon2 · Post by **toon2** » Wed Dec 27, 2006 9:19 am

I currently have a 32 HP, 2cyl. generac motor. It's carbed, and I would like to convert it to FI with Micro Squirt. The motor is used in harsh conditions on a duck boat so I would like to keep the install as basic as possible.
My plan:
Use the current TB and install injector ports on the intake Man.
Install a CHTS

My questions and concerns:
NO relay board( due to the avail. room and conditions) will this work?
No TPS, I connot seem to find a good location on the carb to mount one.
Can the ATS be mounted befor the TB( most apps. I see are after).
NO O2 sensor
My plans are for fuel only right now. I would like to do spark later. The motor has a max RPM if 3600 currently, if I am able to get spark advance is it possible to get more rpm?

I'm sure I left a few things out. I am open to all comments and suggestions.

Thank's, Keith

toon2 · Post by **toon2** » Thu Dec 28, 2006 8:17 am

It seems I don't get a lot of resposes to my posts, what am I doing wrong?

Matt Cramer · Post by **Matt Cramer** » Thu Dec 28, 2006 8:59 am

This board moves a bit more slowly compared to the regular MS forums, as the Microsquirt is just undergoing beta testing at the moment. To answer your questions:

1. You will not need a relay board, but you will need to mount the appropriate relays and fuses in some way.

2. You can run MAPdot acceleration enrichment and make this work with no TPS.

3. Yes, you can run the intake air temp sensor upstream of the throttle body.

toon2 · Post by **toon2** » Thu Dec 28, 2006 9:20 am

thank's Matt,

is there anthing that you can think of that I may have left out for a full FI conversion??

newtyres1 · Post by **newtyres1** » Thu Dec 28, 2006 1:26 pm

You'll probably need a wideband 02 sensor and controller to get it properly tuned. I guess you'll want max fuel economy? After it's tuned you wouldn't really need the wideband. The Innovate LC-1 costs US$200.

Ian.

toon2 · Post by **toon2** » Thu Dec 28, 2006 2:24 pm

are you saying that I could tune the motor with the O2 sensor and then remove it??

In this case fuel economy isn't a concern. The motor is used for short periods of time(30 min. max).

Throttle response is more of a concern. When in use, I would say that 50% of the time it's at WOT, the other 50% is in and out of the throttle, trashing through mud bogs , Tules, weeds, ect..

The motor was setup for dixie chopper lawn mowers and generators that are to be started and then run wide open. The carb lacks a accel pump, if the throttle is opened to fast it will lean out. Some of the time this is workable but there are times when it is a pure PITA.

I am currently MSing a porsche 914 which led me to the possibility of Microsquirting my boat motor. It will be a big undertaking but if it's possible , will be worth it. Keith

newtyres1 · Post by **newtyres1** » Thu Dec 28, 2006 3:38 pm

toon2 wrote:are you saying that I could tune the motor with the O2 sensor and then remove it??

Yes sure, I haven't had any 02 sensor controlling the MS in my bike for more than 12 months, and have not had any issues at all. It runs 100% open loop all the time. The AFR has stayed solid as a rock as I monitor it with the wideband via 10 LED's spanning 11 to 16 AFR. All that does is give me peace of mind, it doesn't really do anything else. Once you have your engine tuned right and you're happy with the tune, then nothing seems to change after that.

So you could use the same wideband that I presume you are going to use to tune your Porsche, unless you're happy to keep one on the boat, your choice...

Ian

toon2 · Post by **toon2** » Fri Dec 29, 2006 6:36 am

doesn't the O2 sensor give real time feed back to MS?If it is removed and the feed back is not there , how are the settings saved? what will the VE tables look like?

MegaScott · Post by **MegaScott** » Fri Dec 29, 2006 9:59 am

The idea is that you are not going to make any more modifications to your engine, and the engine is properly tuned, say within 1-2%. Now you disable EGO correction and just run with the values that are in the VE table, it should run the same as long as you don't change anything, no O2 sensor required at that point.

toon2 · Post by **toon2** » Fri Dec 29, 2006 2:09 pm

so the O2 sensor is used for the initial tune only......cool trick.