Throttle body intake question
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Stage I
Joined: Dec 2019
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From: Florida
Throttle body intake question
I have 05 classic with big bore kit cbc http heads stroked to 103 with stock 88 injectors and throttle body also big cams and pro pipe want to go to bigger injectors and throttle body .what to stick with harley parts any suggestions
Seasoned HDF Member
Joined: Sep 2008
Posts: 14,113
Likes: 11,156
From: San Diego, CA
If you have a good, experienced tuner, I would consult with them about throttle body and injector size...
You need to feed the engine the proper amount of fuel, but bigger isn't always better....
Tell your tuner what mods you are running, what your performance goals are, and then listen to their recommendations....
Stellar HDF Member
Joined: Nov 2005
Posts: 3,183
Likes: 836
From: KMHT KFMY
I thought the 25 degree injectors ( which I think were in that year) flowed pretty good, the tuner is going to set the injector pulse to give it the fuel it needs.
as to the 58MM throttle body..... you'd need a set of heads that really flowed to need that much capacity....
It is really up to the person who built the engine to tune it.... there are sooooo many variables in a Harley motor, especially where head work has been done... it is the ultimate quadratic equation ( or big jigsaw puzzle) trying to match cams with pistons, with heads, and exhaust ... plus a tuner to get all the components to play nice together... something that works in a TC88 runs like crap in a slightly larger engine...
as to the 58MM throttle body..... you'd need a set of heads that really flowed to need that much capacity....
It is really up to the person who built the engine to tune it.... there are sooooo many variables in a Harley motor, especially where head work has been done... it is the ultimate quadratic equation ( or big jigsaw puzzle) trying to match cams with pistons, with heads, and exhaust ... plus a tuner to get all the components to play nice together... something that works in a TC88 runs like crap in a slightly larger engine...
Grand HDF Member
Joined: Aug 2014
Posts: 4,725
Likes: 1,787
From: Toledo ohio
I am considering a stage 4 for my 14 103. I talked to Fuel Moto and Zippers and they both say the stock intake and injectors are good for up to 120 hp or so. Any higher you would need to go with the big intake and higher flow injectors.
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Sep 26, 2019 12:20 PM
