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Message started by YonuhAdisi on 05/06/07 at 09:53:09

Title: From Carb to Fuel injected
Post by YonuhAdisi on 05/06/07 at 09:53:09

Has anyone here done a fuel injection mod? I'm thinking about getting rid of the carb altogether and seeing what can be done with replacing it with a throttle body fuel injection set-up.

Right now its only in the "I wonder if that will work" stage and was wondering if someone could either give me advice on what throttle body injection set-up would work best or if it will work at all.

Title: Re: From Carb to Fuel injected
Post by Max_Morley on 05/06/07 at 12:41:49

An engineering student in Western Wa if I remember correctly, had started on this project about a year ago. Need to find a programmable box, have unlimited dyno time to figure out all the 3D computer programs for engine load, throttle position, RPM, charge ait temperature. It is possible but would be expensive. Max

Title: Re: From Carb to Fuel injected
Post by justin_o_guy on 05/06/07 at 20:43:31

Okay, I admit, I am totally out of my element here, but, I have read that in order to jet one right & easily, an oxygen sensor can be placed in the header p[ipe. I understand that & I think most do. Given that as fact, then a "reader" of the sensor could be used to "adjust" the injector & , via a feedback loop, maximize the mixture, based on a preset preferred output from the oxygen sensor. If the sensor reads rich, it leans the mix, if lean, it richens. Is that reasonable? It SAYS easy,, no idea how hard it would be to do it. I dont even know if doing it perfectly would actually create a usable injector system.. Just a thot,, please, if yer gonna laff, do it quietly? OOOkay, I am goin back to my corner now..

Title: Re: From Carb to Fuel injected
Post by azjay on 05/07/07 at 07:00:56

the newer generation of harley F.I. is more programmer friendly than the earlier version. an 883 sportster fuelie system may be an option.

Title: Re: From Carb to Fuel injected
Post by Max_Morley on 05/07/07 at 10:21:56

From the retired Auto teacher, you are correct, the O2 sensor does trim the the A/F ratio to 14.7:1, but the basic injector on time (in ms) is determined by the factors I mentioned. Also ignition timing mapping is part of the math the computer accomplishes. It is all doable, but payback is going to take forever. Max

Title: Re: From Carb to Fuel injected
Post by YonuhAdisi on 05/07/07 at 15:59:19

Well, that definately sounds more complicated than I thought it might be. Here I was thinking, take off carb, put on throttle body and you're ready to rock. I will just have to do much more research on it and take it slow.

Title: Re: From Carb to Fuel injected
Post by justin_o_guy on 05/07/07 at 21:06:08

Remember. I am talkin way over my head, but I think I kave this right. When the throttle is cranked open part way, a throttle position sensor has to tell the injector"He wants 40% throttle" or 50% or Wide Open, shoot the gas in there!!" & the O2 sensor will be deciding if the injector is doing the right job & telling the computer to make adjustments. This isnt a weekend project. Well,, not for me anyway//

Title: Re: From Carb to Fuel injected
Post by YonuhAdisi on 05/07/07 at 21:38:02

It definately won't be a weekender for me either. Now if I could only find a full kit with everything from the wiring to the throttle body and injector it just might be a weekender.

Title: Re: From Carb to Fuel injected
Post by slavy on 05/08/07 at 10:53:50

I would never even think about something like that !
I like the simplicity. If there was a way to do it cheaper, I'd go back to the kick starter, remove all the safety systems , go to a magneto and the only thing left will be to ride and make sure there is oil and gas in the bike.