Throttle body spacer... worth it?
09-18-2009, 06:16 PM
#21
JK Newbie
Join Date: Jul 2007
Location: Melbourne, Australia
Posts: 11
Likes: 0
Received 0 Likes
on
0 Posts
i like that! haha
09-18-2009, 06:50 PM
#22
JK Super Freak
Back during the days of carbureated engines, and maybe even also in the early days of the T/B injection where the air and fuel were mixed prior to entering the cylinder, perhaps a bit of a gain.
Today however the JK engine is electronically controled multiport injected. That means the fuel and air only come together in the cylinder, and the air must travel through the runners of the intake manifold before it reaches the cylinder. Irregardless of how much air you allow into the t/b since the intake runners remain the same, only a given amount of air will enter the cylinder during the intake cycle of the engine.
Perhaps if one were to add a t/b spacer then somehow force the air through the runners and into the cylinder then there would be a difference, ahhh but wait. Someone has, and it's called a supercharger.
Some company's that produce the t/b spacer, design it to create a vortex, and claim that the vortex gives a better mix. Again this would be true provided the vortex would carry through the intake runners and into the cylinder, but I doubt these rings in the t/b have the capability to perform such a feat.
Countless automotive mechanics I've talked to about this has said the same thing. Installing a throtle body spacer in todays multiport injection systems simply will not any HP increase.
And if we really think about it, if something like that would work, wouldn't the auto manufacturer add one in the factory.
Today however the JK engine is electronically controled multiport injected. That means the fuel and air only come together in the cylinder, and the air must travel through the runners of the intake manifold before it reaches the cylinder. Irregardless of how much air you allow into the t/b since the intake runners remain the same, only a given amount of air will enter the cylinder during the intake cycle of the engine.
Perhaps if one were to add a t/b spacer then somehow force the air through the runners and into the cylinder then there would be a difference, ahhh but wait. Someone has, and it's called a supercharger.
Some company's that produce the t/b spacer, design it to create a vortex, and claim that the vortex gives a better mix. Again this would be true provided the vortex would carry through the intake runners and into the cylinder, but I doubt these rings in the t/b have the capability to perform such a feat.
Countless automotive mechanics I've talked to about this has said the same thing. Installing a throtle body spacer in todays multiport injection systems simply will not any HP increase.
And if we really think about it, if something like that would work, wouldn't the auto manufacturer add one in the factory.
09-18-2009, 08:20 PM
#23
JK Jedi Master
Back during the days of carbureated engines, and maybe even also in the early days of the T/B injection where the air and fuel were mixed prior to entering the cylinder, perhaps a bit of a gain.
Today however the JK engine is electronically controled multiport injected. That means the fuel and air only come together in the cylinder, and the air must travel through the runners of the intake manifold before it reaches the cylinder. Irregardless of how much air you allow into the t/b since the intake runners remain the same, only a given amount of air will enter the cylinder during the intake cycle of the engine.
Perhaps if one were to add a t/b spacer then somehow force the air through the runners and into the cylinder then there would be a difference, ahhh but wait. Someone has, and it's called a supercharger.
Some company's that produce the t/b spacer, design it to create a vortex, and claim that the vortex gives a better mix. Again this would be true provided the vortex would carry through the intake runners and into the cylinder, but I doubt these rings in the t/b have the capability to perform such a feat.
Countless automotive mechanics I've talked to about this has said the same thing. Installing a throtle body spacer in todays multiport injection systems simply will not any HP increase.
And if we really think about it, if something like that would work, wouldn't the auto manufacturer add one in the factory.
Today however the JK engine is electronically controled multiport injected. That means the fuel and air only come together in the cylinder, and the air must travel through the runners of the intake manifold before it reaches the cylinder. Irregardless of how much air you allow into the t/b since the intake runners remain the same, only a given amount of air will enter the cylinder during the intake cycle of the engine.
Perhaps if one were to add a t/b spacer then somehow force the air through the runners and into the cylinder then there would be a difference, ahhh but wait. Someone has, and it's called a supercharger.
Some company's that produce the t/b spacer, design it to create a vortex, and claim that the vortex gives a better mix. Again this would be true provided the vortex would carry through the intake runners and into the cylinder, but I doubt these rings in the t/b have the capability to perform such a feat.
Countless automotive mechanics I've talked to about this has said the same thing. Installing a throtle body spacer in todays multiport injection systems simply will not any HP increase.
And if we really think about it, if something like that would work, wouldn't the auto manufacturer add one in the factory.
(I'm pretty sure the fuel and air come together just prior to the intake valves.)
09-18-2009, 09:41 PM
#24
JK Super Freak
"With electronic multiport injection, fuel is delivered directly to each cylinder via individual injectors. The intake manifold is then used exclusively for air induction (dry intake system). "
09-18-2009, 09:47 PM
#25
What he was reffering to is where the fuel is injected. which is right at the back of the intake valve. versus IN the intake manifold like throttle body injection or carb. Any sequential fuel injection (our 3.8L) fuel is injected in the intake port.
09-19-2009, 01:22 AM
#27
It's simple, really......if the fuel is introduced somewhere AFTER the throttle body, then upgrading the throttle body is totally useless. The air and fuel have to swirl together going into the engine for the effect to work.......not that it ever worked that good to begin with. .....but then, people still buy snake oil, too.
09-19-2009, 03:25 AM
#28
JK Jedi
Join Date: Oct 2007
Location: Colorado
Posts: 5,537
Likes: 0
Received 0 Likes
on
0 Posts
I got one for free with my Airaid and sold it on eBay, made the total investment in the intake about $150, which was about as high as I was willing to go for the limited benefit.
09-19-2009, 04:15 AM
#29
JK Jedi Master
Not to start a debate, however this taken from how the new electronic multiport fuel injection system works:
"With electronic multiport injection, fuel is delivered directly to each cylinder via individual injectors. The intake manifold is then used exclusively for air induction (dry intake system). "
"With electronic multiport injection, fuel is delivered directly to each cylinder via individual injectors. The intake manifold is then used exclusively for air induction (dry intake system). "
Fuel "delivered directly to each cylinder by individual injectors" doesn't mean injected into each cylinder.
I was just indicating our engine is not direct injection, which is a technology still in development for gas engines. It would be a big deal if Jeep had put direct injection in any of their gasoline vehicles. It would not have been ignored in their advertising.
Last edited by ronjenx; 09-19-2009 at 04:19 AM.
09-19-2009, 10:19 AM
#30
JK Super Freak
No debate....
Fuel "delivered directly to each cylinder by individual injectors" doesn't mean injected into each cylinder.
I was just indicating our engine is not direct injection, which is a technology still in development for gas engines. It would be a big deal if Jeep had put direct injection in any of their gasoline vehicles. It would not have been ignored in their advertising.
Fuel "delivered directly to each cylinder by individual injectors" doesn't mean injected into each cylinder.
I was just indicating our engine is not direct injection, which is a technology still in development for gas engines. It would be a big deal if Jeep had put direct injection in any of their gasoline vehicles. It would not have been ignored in their advertising.
I still maintain, however that a T/B spacer is not a good efficient upgrade.
Again thanks for the info.
