HarleyTechTalk

I'm converting my 2000 FLHTPI from Magneti Marelli to Carburetor.  The guy I bought the CV40 carb from says he's done the conversion to a customer's bike without replacing the ECM - that is to say they just bolted on a carb and hooked up a petcock, but left the ECM and coil to do the firing of the ignition. No new ignition wiring harness, module or coil!

Anyone else do theirs that way? The guy said that the customer's been tickled with the change-over for the past two years. If nothing else, is there any reason why not to try it?

(To  : My main problem with my EFI is the "just off idle" throttle responsiveness (horrible in slow traffic or a parking lot), but also the throttle response in general, the vibration at 1200 RPM, the inability to try out different pipes, the inability to just tinker with it for the hell of it. I got the SERT to get things right, but having read the disc it came with, I'm not too keen on dinking with the spreadsheets (especially since it doesn't show where you're at). Dyno guys cost too much and scorn Magneti Marelli anyway.The shop that dyno'd my SERT gave me the impression that timing wasn't one of the things they modified much, anyway.)

Thanks


2000 FLHTPI
1976 850 T-3 Moto Guzzi

Might work but I'd wonder what the ecm does to the timing without any TPS.. If it uses MAP and RPM for timing, It'd prolly work..

Is it possible you could get it to run by doing what was suggested? Yeah.
Would I do it that way? I can think of a lot more reasons not to than I can to do it that way ... your bike, do what you will.

Ed

aka "Mr. Negative IACS"

Me thinks a # 32478-99 will do it.
Scott

Quote from: Hillsidecyclecom on November 17, 2009, 01:20:43 PM
Me thinks a # 32478-99 will do it.
Scott

Ignition module required as it takes signal from MAP sensor and adjusts spark timing !!  Also accepts signal from Bank Angle Sensor.

All I said was it could run ... I didn't comment on how well it would run. 

Yep, timing and BAS were among the first things that came to mind ... others too.

Ed

aka "Mr. NIACS"

Ed,
What does the "N" stand for?
Oh, I went back a couple of posts, I see now.
Scott

Scott,

A summation of the things I've been "accused" of being here:

Negative Attitude
Insider A$$hole
taking Cheap Shots

It may be a growing list and aka ... ya know like merit badges in the Boy Scouts 

Ed

aka "Mr. FOSNIACS"

Had to try to figure out all the acronym stuff.  Looks like I asked this at the wrong time. I guess so long as the I doesn't stand for ignorant, the ACS is pretty easy to ignore online. 

My other bike still has points, and you adjust the carbs by disconnecting one plug wire and counting how many times the other cylinder fires before stalling. So I know I'm stepping into another dimension here.

Nevertheless, it seems as if one electronic controller is as good as another if they do the same thing with the same data.  Aside from alot of exta wires to hide, (and maybe also violating the principle of not doing it "up-to-code")  I thought I ought to check if a Knowledgeable person had pressing reasons not to do this.

My main reason, of course, to skip the new module, coil and harness is to try to save about 600 bucks!

Mr Ignorant Asking for Cheap Suggestions

Thanks again.

Scott and FyrFtr,

The MAP will still be hooked up to the new manifold.

Joe

Quote from: ederdelyi on November 17, 2009, 01:43:26 PM
A summation of the things I've been "accused" of being here:

Negative Attitude
Insider A$$hole
taking Cheap Shots.....
aka "Mr. FOSNIACS"

Thanks a lot Ed. I worked my butt off for years for that reputation and in a matter of a couple weeks you rip it right out from under me.
Glad we can share,
Bob

Bob,
No problem, your status is secure  I'll be heading up North soon and plan on going off the grid until after the first of the year. I'll leave it to you and others to add to their "merit badges".

RJ,
You will have an Alpha-N controller with no TPS with which to determine what ignition advance setting to use. The MAP sensor is only used by the MM controller as a BARO sensor and only uses it to determine atmospheric pressure on initial startup. That's one problem, there are more ... BWTFDIK?


Y'all have s nice holiday season

Ed

aka "Mr. FOSNIACS" MSBS

Ed,
I had to look up Alpha N, but now I understand what you're saying. Thanks. I wonder now if those guys at the shop actually converted a Delphi to carb or if they're full of (mistakenness).

Quote from: ederdelyi on November 17, 2009, 01:43:26 PM
Scott,

A summation of the things I've been "accused" of being here:

Negative Attitude
Insider A$$hole
taking Cheap Shots

It may be a growing list and aka ... ya know like merit badges in the Boy Scouts 

Ed

aka "Mr. FOSNIACS"

On other boards, I have been whispered about in PM's, e-mails and 3-way, tape-recorded conversations as a form of Satan, and other words that have aggressive "K" sounds in them!!
Scott

QuoteI'll be heading up North soon and plan on going off the grid until after the first of the year.

Heck I've been "off the grid" for 10 years.. Off the grid right now... Max

Quote from: ReadyJoe on November 17, 2009, 02:05:23 PM
Had to try to figure out all the acronym stuff.  Looks like I asked this at the wrong time. I guess so long as the I doesn't stand for ignorant, the ACS is pretty easy to ignore online. 

My other bike still has points, and you adjust the carbs by disconnecting one plug wire and counting how many times the other cylinder fires before stalling. So I know I'm stepping into another dimension here.

Nevertheless, it seems as if one electronic controller is as good as another if they do the same thing with the same data.  Aside from alot of exta wires to hide, (and maybe also violating the principle of not doing it "up-to-code")  I thought I ought to check if a Knowledgeable person had pressing reasons not to do this.

My main reason, of course, to skip the new module, coil and harness is to try to save about 600 bucks!

Mr Ignorant Asking for Cheap Suggestions

Thanks again.

I have a new Igntion Moduloe for a 99nTwin Cam touring and also a bank angle sensor if you need them.  You also will still need to use the cam position and crank position sensors.  If you go to after market like Dayton TwinTec, you can eliminate the cam position sensor.  2004  model use a TSSM/Turn Signal Security Module which has internal BAS function.

FYRFTR,

Thanks. I think I probably will go with the DTT, so as to eliminate cam sensor, include coils, and get some adjustability.

(Though I'm kind of thinking if I could get a stock one from an '01 for cheap (assuming they ignore cam sensor) that I might try that first and go to a DTT later if I'm dissatisfied.  I'll still need coil though.)

Joe

You can purchase a SE module and the coil for about $175.00 on the internet.  Why are you replacing the coil?  The coil is a single fire on all twin Cams, no wasted spark!!

I've read that the coil that goes with the MM FI is different from and won't work with the carb ignition set up. I haven't actually checked part numbers, but every parts list and post I've read seemed to agree on that.

Quote from: ReadyJoe on November 18, 2009, 10:48:23 AM
I've read that the coil that goes with the MM FI is different from and won't work with the carb ignition set up. I haven't actually checked part numbers, but every parts list and post I've read seemed to agree on that.

Call your dealer and check it out !!  manuals make no distinction !!  In any event you will pay over 350 for the DTT coil and module and the SE can be had for half as much.  What are you using for a wiring harness?

You *can* use the same coil. They're pretty spendy, especially if you don't *need* it. How it's hooked up depends on your wiring harness. The last one I did I soldered and heat shrinked the wires to the original coil plug and it's been going fine ever since.

HTH,

Dale

Ignition harness 32435-00.  Couldn't find an -01.  Should arrive next week.

So is the coil the same, only the connector is different?  (I haven't actually seen the connectors yet.)

 I "coverted " about 2 years ago `01  flht M&M to carb.. used the same ign coils   (efi)  with a stock 02  ign  and 02  ign harness  ,later upgraded to DTT .........bladerunner

HarleyTechTalk > General & Model Specific > Twin Cam > M&M to carb conversion

The ignition coil for TC's (at least the first 7 years) has one part number, it is the same coil used both for carb and FI. The different coil story you have read about is in regard to EVO M&M FI's

xlfan