Should I get a Throttle Body and Injectors?? - Road Glide Forums
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post #1 of 7 (permalink) Old 11-24-2012, 11:01 AM Thread Starter
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Should I get a Throttle Body and Injectors??

I am having CNC heads put on my 103" that are ported and polished and they have bigger valves, I am keeping the compression ratio at 10:1 to 1 so I am wondering if the 58MM throttle body with upgraded injectors would be beneficial or will the stock 50MM TB and injectors work well with this upgrade? I do a lot of touring and I don't hot rod to much (I get on it now and then) but I like the power to pull on long grades and to pass without downshifting.

08 FLTR candy red sunglo, 103 Stage II, Woods TW-222 cams, V&H Dresser Duals with Monster Rounds, Thundermax tuner, Willy Shiny Wheels and Forks and a bunch of other stuff.
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post #2 of 7 (permalink) Old 11-24-2012, 12:28 PM
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Depends on a lot of factors . First call an engine builder. Second more than likely you can port your current tb and use the current injectors. My brothers 124 has the 5.3g injectors and works really well. He also has the 58mm th and works well. Try porting the Tb first and run look at injectors later.
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post #3 of 7 (permalink) Old 11-24-2012, 08:43 PM
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You looking for max horsepower and high rpm? 50mm is sufficient if you're not looking to break into the 120+ range MY opinion... My 95" build with stock 50mm made plenty of power.
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post #4 of 7 (permalink) Old 11-24-2012, 08:52 PM
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Yeah my buddies 95 was nice with the 50 mm tb and now rips with his 54 mm tb. Call a builder.
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post #5 of 7 (permalink) Old 11-25-2012, 10:02 AM Thread Starter
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From what info I am looking up the stock will be fine for the build that I will have so I am going to stick with the 50 mm for now.

08 FLTR candy red sunglo, 103 Stage II, Woods TW-222 cams, V&H Dresser Duals with Monster Rounds, Thundermax tuner, Willy Shiny Wheels and Forks and a bunch of other stuff.
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post #6 of 7 (permalink) Old 11-26-2012, 05:44 AM
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Your 50 will work fine in your application.
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post #7 of 7 (permalink) Old 11-26-2012, 06:51 AM
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when thinking of a larger TB,give thought to where you want the power,if its down low,stick with the stocker.if your looking for high RPM power,a bigger TB is the ticket,but one thing alot of riders/builder overlook is runner size,bigger runners on a smaller TB will make more of a CFM increase than a bigger TB with stock sized runners
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