I have upgraded my 96" to the FM 107" with TW555 cams, 2-1 pipes, K&N a/c, and tmax as a tuner. Do I need to consider upgrading the throttle body from the stock 46mm to something larger (S&S)?

I know FM polish and port a stock TBW touring throttle body but looks like the increase in hp/tq is marginal. So wondering if something I need to consider as I have increased bore, exhaust, a/c but kept the TB stock. Havent found any research on pros/cons.

Thanks,
Don

2008 FXDC

 

You should try headwork first.

 

Don't really want to up the compression as the quality of gas can be suspect once I get out of Manila.

 

Talk to Eric or Jimmy ay horsepower inc. They can rework your throttle body or one that hpi makes depending on what you need .

 

I do... i actually stock a TB for exchange... we can port and polish it and also powder it if you would like... i also upgrated to 12* injectors when i did mine... but have a good amount of customers that have just done the swap with our TB mods and have reported back great feedback! there are a few guys on here as well

 

A sidebar, later down the road, I plan on doing the FM 107 upgrade, how do you like yours? Noticeable difference?

 

to answer your original question, All the TB does is supply ai/ fuel mixture. So don't bother with your TB until you have your heads done.


LOL thank you johnnyjellybeans! of course air too!

 

Actually ..... it supplies air. maddghost..... you going tonight?

 

I went from 96" to 103" and had some head work done. Went with Woods 777 cams. I removed the stock TB and installed the SE 50 mm unit. Came with all of the sensors/actuators as well as the higher flowing injectors that a higher output engine is going to require.

 

If you go with a larger tb, is a stage 1 ac too restrictive to see the benefits?