hey there! im in the process of upgrading my setup and i would like to change my stock throttle body to a bigger diameter one, now i understand that the biggest diameter i can upgrade to is 62mm without any major mods , against the stock ones 58mm? ive found several in the internet , from painless, hesco etc! anyone had any experience with those or used a different one that he could recommend to me? thanks in advance!
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throttle body upgrade
- Thread starter nickPRO
- Start date
- Location
- Minneapolis, MN
Your stock TB can be bored to 60mm, either in your garage or at a machine shop. Search for one of the several DIY write-ups. 60mm is sufficient for any mildly modified 4.0L.
jeeperjohn
NAXJA Forum User
- Location
- Temecula, CA
I have mine bored to 64mm. The only real difference I see is better throttle response. I would not spend any money on the throttle body unless you are doing a stroker. There are really not any gains worth the cost.
trail rate this
NAXJA Forum User
- Location
- Cape Coral, FL
I've bored them as far as 63mm. I love my 63mm. I have yet to have anyone tell me they didn't notice a difference on a stock 4.0. I bore them a lot cheaper than any place you'll find on the net.
HaleYes
NAXJA Forum User
- Location
- Clay County, IL
At 60mm you can still use the stock butterfly.
Any bigger than that and you need a new butterfly.
sjx40250
NAXJA Forum User
- Location
- Alexandria VA
And the intake manifold port is 60. I agree with JeeperJohn. The improvement is in throttle response and that is about it. Don't forget about the venturi in the intake hose between the box and the TB. You may want to remove that too.
joe_peters
NAXJA Forum User
- Location
- Grants Pass, OryGun
Read this article @ JP Magazine on 4.0 Myths:
http://www.jpmagazine.com/techartic...iter_engine_myth_busting_true_lies/index.html
http://www.jpmagazine.com/techartic...iter_engine_myth_busting_true_lies/index.html