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ECM/Fuel Management systems ECM/Fuel Management systems For Road Glides

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post #1 of 7 (permalink) Old 01-17-2019, 11:56 AM Thread Starter
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Injectors

I'm starting to research a 124 crate swap for my ride. I got in touch with S&S and they recommended 6.2 or larger injectors along with at minimum a 58mm throttle body. My question would be, what brand of injectors and or throttle body is everyone using for their builds? I'm finding a bunch of injectors but there seems to be limited brands for throttle by wire models

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post #2 of 7 (permalink) Old 01-17-2019, 12:19 PM
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I've never had any issues or even heard anything negative about the HD SE high flow injectors. Same with the SE 58, 64, or 66mm TB's. If you are not going to be racing too much I would just stick to the 58mm TB and not worry about anything bigger. Makes it a bit easier to tune.

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post #3 of 7 (permalink) Old 01-18-2019, 08:16 AM
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I’m putting am HPI 58 elyptical and SE 5.3 injectors on my 124. Not an S&S crate engine but...
5.3 is enough for 124 according to HPI and I would think they know throttle bodies. As I understand it, and I may not understand it, a larger throttle body will work and may get you a higher peak HP but may have bad manners at low to mid throttle. Might make the power....like a light switch, not real smooth but on/off. Hoping that makes sense. That was how it was explained to me anyway. Very possible that I’m wrong.
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post #4 of 7 (permalink) Old 01-18-2019, 08:34 AM
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Originally Posted by MightyWhitey View Post
I知 putting am HPI 58 elyptical and SE 5.3 injectors on my 124. Not an S&S crate engine but...
5.3 is enough for 124 according to HPI and I would think they know throttle bodies. As I understand it, and I may not understand it, a larger throttle body will work and may get you a higher peak HP but may have bad manners at low to mid throttle. Might make the power....like a light switch, not real smooth but on/off. Hoping that makes sense. That was how it was explained to me anyway. Very possible that I知 wrong.

This is some very good information and I would agree with the 5.3 being enough for a 124".

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post #5 of 7 (permalink) Old 01-19-2019, 04:17 PM Thread Starter
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I知 putting am HPI 58 elyptical and SE 5.3 injectors on my 124. Not an S&S crate engine but...
5.3 is enough for 124 according to HPI and I would think they know throttle bodies. As I understand it, and I may not understand it, a larger throttle body will work and may get you a higher peak HP but may have bad manners at low to mid throttle. Might make the power....like a light switch, not real smooth but on/off. Hoping that makes sense. That was how it was explained to me anyway. Very possible that I知 wrong.
yeah when I spoke with S&S they said for their 124 high compression (10.8:1) motor they recommend a larger 66mm t-body with a minimum of 6.2 injectors because it will have more HP over TQ as apposed to the lower compression (10.2:1) motor that they say will have more TQ than HP. he told me the low compression motor should be fine with a 58mm t-body and the same injectors. I would imagine id get 6 different suggestions from six different companies. im 99% sure im going with their low compression motor anyway but im just trying to get as much info as I can before I start buying the wrong stuff

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post #6 of 7 (permalink) Old 01-19-2019, 04:35 PM
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yeah when I spoke with S&S they said for their 124 high compression (10.8:1) motor they recommend a larger 66mm t-body with a minimum of 6.2 injectors because it will have more HP over TQ as apposed to the lower compression (10.2:1) motor that they say will have more TQ than HP. he told me the low compression motor should be fine with a 58mm t-body and the same injectors. I would imagine id get 6 different suggestions from six different companies. im 99% sure im going with their low compression motor anyway but im just trying to get as much info as I can before I start buying the wrong stuff

The info they gave you is good but it's all in how you want your power. Lower compression and Tq is what you want for touring. I wouldn't worry about getting peak Hp unless I wanted it to race. Tq is still what gets these big bikes down the road.


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post #7 of 7 (permalink) Old 01-19-2019, 05:03 PM Thread Starter
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The info they gave you is good but it's all in how you want your power. Lower compression and Tq is what you want for touring. I wouldn't worry about getting peak Hp unless I wanted it to race. Tq is still what gets these big bikes down the road.


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yeah im fully aware of this. this is my first build/engine swap or whatever so Im trying get enough info so I can try to do it right the first time and eliminate money wasted on wrong parts if at all possible lol. im not worried about doing 200mph down the highway lol
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