Hi flow throttle body power increase?
- Thread starter Mike1
- Start date
MudderChuck
New member
Most people I´ve heard that have done the mod. and some of the manufactures literature, say most of the increase, is in the mid to high RPM range. 2000 RPM is a pretty good clip in high gear.
Bigger throttle body equals lower vacume at greater than say half throttle, could cause problems, especially if your vacume system has some small leaks, things add up. Lower than expected intake vacume. can give some of your sensors, a hissy fit, been there done that. Can actually cost you torque or grunt, right at the RPM range, where you need it most, low to mid.
Bigger throttle body equals lower vacume at greater than say half throttle, could cause problems, especially if your vacume system has some small leaks, things add up. Lower than expected intake vacume. can give some of your sensors, a hissy fit, been there done that. Can actually cost you torque or grunt, right at the RPM range, where you need it most, low to mid.
mingez
New member
This dude has a write up on it. He claims that it increased throttle response. I haven't heard much negative about this mod.
http://www.jeepin.com/features/throttlebody/index.asp
So far, he's been right on with all of his recommendations, and I know that he isn't affiliated with J and C.
http://www.jeepin.com/features/throttlebody/index.asp
So far, he's been right on with all of his recommendations, and I know that he isn't affiliated with J and C.
Bounty__Hunter
Super Moderator
I noticed quicker throttle response, and more power, but with a 2.5L engine. Most noticable was being able to climb hills easier and further before having to downshift.
MudderChuck
New member
Many people buy the bigger throttle body, instead of regearing, thinking that more power is gonna turn the big tires better. May a little, but I don´t think a lot. Might help it rev a little faster, but most of the difference is gonna be at higher RPM´s.
Heard of many who installed adjustable MAP sensors, after the throttle body change, to deal with the reduced intake vacume and to tune the throttle body function a bit.
Heard of many who installed adjustable MAP sensors, after the throttle body change, to deal with the reduced intake vacume and to tune the throttle body function a bit.
MudderChuck
New member
Picking gears, is usually done by matching tire size, to the new gear set. First thing to do is figure, what tires you are gonna be running, what differential and gear set you have.
Many of the major gear suppliers, have a chart showing, the shape of the differential cover, to identify the differential you have.
Often there is often a tag, on a differential cover bolt, that shows the number of teeth in the pinion and the ring gear, simple dividsion will give you the ratio. Sometimes the tag gives the ratio, like 3.55 or 3.73.
What kind of driving you do, also has imput into which gears you choose.
Shopping and sales can save a bunch, major suppliers are often the best bet. Customer service is also a criteria when choosing a gear supplier.
Gear changes aren´t often a do it yourself operation. Though they can be done youself, with some special tools and serious research.
Many of the major gear suppliers, have a chart showing, the shape of the differential cover, to identify the differential you have.
Often there is often a tag, on a differential cover bolt, that shows the number of teeth in the pinion and the ring gear, simple dividsion will give you the ratio. Sometimes the tag gives the ratio, like 3.55 or 3.73.
What kind of driving you do, also has imput into which gears you choose.
Shopping and sales can save a bunch, major suppliers are often the best bet. Customer service is also a criteria when choosing a gear supplier.
Gear changes aren´t often a do it yourself operation. Though they can be done youself, with some special tools and serious research.
mingez
New member
Mike1 said:
Here's a chart. One for lift size, and one for gear/tire ratio. The gear/tire chart is subjective. You'll hear many arguments refuting the numbers, but it's about the concensus of what I've read and heard from others.
I run 33x 12.50 sized tires, and I have 4.56 gears installed. I think I could use 4.88's though. (if they made 4.88's for my axel... damn commies.):x
click here: http://www.collinsbrosjeep.com/tiregear.htm
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