MicroSquirt.com read only forum (Jan.15,2018)

Hey guys, please feel free to use this thread for any HD related questions.

I've got an old '73 1000cc Sporty that needs induction help badly. Has an S&S superB that has never been right and looks like it never will.

I'm wondering what folks have tried for throttle bodies for HD? I've seen somewhere that a fellow modified an old S&S to use as a TB but it almost seemed it'd be as easy to make one from scratch if you could get a suitable throttle plate somewhere.

I'm also wondering about injector size and whether it's wiser to use one or two injectors. Probably sometime this summer or perhaps next fall I'll spring for a uS to put on it.

The best throttle body to use in this situation would be from a fuel injected Buell. These come up for sale on eBay constantly since many take Buells and scrap them out for chopper parts. The chopper guys hate FI so these parts go for cheap. The whole setup including the throttle body, tps, manifold, two injectors, and injector rail usually go for about $100 depending on who is bidding. The manifold connection to the throttle body is exactly the same as the Keihin CV carb so you'll need to buy a flange to spigot style carb adaptor to hook one to your manifold.

For the injection, I'm not sure your stock manifold has enough room to mount two injectors since the older style manifold is really short and has alot of surface area taken up with the clamps. If you can get two on it, then the stock Buell injectors would be sized pretty close to ideal. If not, one larger one in the middle should work fine since the four guys that I've run across using MS on a Buell have found that two squirts simultaneous works best. This probably holds true for all v-twins until someone writes code for odd-timed sequential injection.

formerSlimJim wrote: This probably holds true for all v-twins until someone writes code for odd-timed sequential injection.

Al has in the beta code the ability to trigger from two input tach signals, i.e. two hall sensors or VR sensors. One input triggers one injection channel and one ignition channel, the other input triggers the other coil and injector bank. They are independent from each other, things like RPM, etc are computed from the channel 1 input. Since they are independent, the crank degree spacing between them (i.e. delta T between channel one and channel 2) does not matter. So the unit supports odd-fire, and it also injects based on which input (channel 1 input fires injector 1, channel 2 input fires injector 2).

- Bruce

That's interesting. I knew of the second trigger and odd fire that has been added but I missed that the code would also support odd squirt.

I'm planning to put Mega or Microsquirt on a '98 Weber/Marelli Road Glide. Stock inputs are a 36-1 crank sensor and 2 "tooth" cam sensor/cup for determining which cylinder to fire. I was trying to figure out how to blend something like dual wheel and EDIS but it doesnt come together easily without a second channel. Unless I just haven't read that part in the Manual yet.
So....do both of these circuits in uSquirt have to be identically triggered or is there a way to compare the sensors to do sequential squirt AND spark? I'm guessing I'll get to do some coding.

--Oh wait, there's alfa code for MSnS addressing this that might solve it.
--Howd I miss that?
--If it's has been done successfully I'm interested.
--I have a bike to try it on when uS comes out, if not.

>I'm wondering what folks have tried for throttle bodies for HD?

As wth the Buell Bits, the Weber-Marelli Big Twin intakes are pretty often cast away. By folks going to carbs. "Everyone knows" you "can't make any power" without the Delphi TB, and hacks for that stock Weber controller dont exist, even in the Ducati world.
You can find entire EFI setups off E(vil) Bay pretty cheap. The intakes have longish 38mm runners so if you have a mild engine and are looking at lower RPM, the stock 80" setup ought to do you. With harness, TPI sensor, regulator and injectors (21#/hr), They are out there usually around $150-200. They are set up for 2Bar fuel pressure. The SE (red) injectors are 32#/hr I believe.
Stock, my Evo runs and idles OK, but the Marelli Controller is easily confused and justifiably hated. Hence the interest in Megasquirt.

You'll want the in-tank pump, regulator and recirc hardware as well. There are kits available for modfying tanks to and from EFI, but it's cut and weld, not bolt-up, due to the recirc line. IIRC the Buell is Delphi and runs higher fuel pressure.

I dont know the status of a stock sportster tank with FI internals.
HTH

I have my name on the DIY waiting list and I'm looking forward to trying the new MicroSquirt on my 2000 EFI Harley.

I too was also wondering how to set up the MicroSquirt with the current 36-1 crank sensor and 2 "tooth" cam sensor/cup.

My current aftermarket ECU is called Twin Talon and it's made by Internal Combustion Technologies. It handles both fuel and spark but I'm looking forward to having acceleration enrichment and closed loop O2 tuning.

mikestiffler wrote:I have my name on the DIY waiting list and I'm looking forward to trying the new MicroSquirt on my 2000 EFI Harley.

I too was also wondering how to set up the MicroSquirt with the current 36-1 crank sensor and 2 "tooth" cam sensor/cup.

My current aftermarket ECU is called Twin Talon and it's made by Internal Combustion Technologies. It handles both fuel and spark but I'm looking forward to having acceleration enrichment and closed loop O2 tuning.

IIRC the '99 and up are running Delphi as stock. Right?
Mines Marelli and is sequential, the Spark and Injector fire at the same time. The 2 microSquirt output channels would seem to be optimal for this aproach.

I also like the full feature set of Mega squirt, but want/need a small watertight enclosure. I was originally working on adapting my Buick TBI controller to the Harley. But it'd require more of a hack, different inputs, more space, weatherproofing, and burning EPROMS, (as on my Buick) at about the same cost overall. Without wideband, or an easy interface.

Megasquirt code has the ability to do diferent types of wheel decoding, and odd-fire. It looks like a minimum amount of "code slinging" would be needed to get it all together for this setup. Mostly drag-n-drop, and config. I'll let you know how my project goes.

I apologize for my ignorance, but what is IIRC?

My 2000 Ultra and my wife's 2001 Road King have the Marelli ECUs. If I'm not mistaken 2001 or 2002 softails had the Delphi system. I'm not sure when the Buells got the Delphi system, but I don't think they ever had the Marelli system.[/code]

what is IIRC?

mikestiffler,

IIRC = if I recall correctly

Lance.