When to upgrade tb
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Outstanding HDF Member
Joined: Jan 2014
Posts: 2,482
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From: Minnesota
When to upgrade tb
I'm planning a 107 build on my 14sg this winter. I will probably have my local guy bore it and do a mild port on heads (stock valve size) and smooth throttle body. Was planning about 10.5-10.8 compression and probably woods cams.
My question is, when do you need to increase the throttle body? With this build would I see a increase with a larger tb over ported 50mm? If any change where would it be, tq or hp? High or low?
My question is, when do you need to increase the throttle body? With this build would I see a increase with a larger tb over ported 50mm? If any change where would it be, tq or hp? High or low?
Seasoned HDF Member
Joined: Dec 2009
Posts: 9,165
Likes: 1,910
From: Doghouse... mostly
A massaged 50 mm should be fine for a 107" build. As far as the increase you're expecting, you won't see that much with a larger unit, maybe 1-2 hp and 3-4 on the overall tq. So unless you're into racing where you need to squeeze every bit out of the motor there's other places to invest the $$ into the motor such as the heads.
Road Captain
Joined: Mar 2009
Posts: 689
Likes: 6
From: Glen Rose TX
I'd think that instead of a Mild Port and stock valves and a bored TB you would be better off putting the money into a full head-port with OS intakes as Kirby suggests and then matching the ports on the TB/Intake/Heads.
Your current plan is doing both sort of half way
Your current plan is doing both sort of half way
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