[silverbullitt51]

so ive had my jlt intake about 2 weeks now and just got a throttle body spacer, i thought the sucking noise the cai made was loud before but now...you'd think it was supercharged...its crazy, now i havent driven it yet so i dont know performance gains but the sound alone was worth the $20 i spent on it. i just got a 1/2" smooth throttle body spacer not one of those crazy fancy ones, ill report back after my drive home from work

[silverbullitt51]

Well, it's not a large gain by any amount but you can tell a slight bit of jumpiness from the low end and helps hold the power longer in the high end. I'm shocked it did Nything at all but I think it was well worth it and would recommend it, here's the link I got mine at

FORD MUSTANG 4.0L V6 THROTTLE BODY SPACER 2005-2009 GT | eBay

[DonJuan16]

I am confused on how this one would work. I thought really the only way that they worked at all was from the ridges on the inside of it rotating the air.

[jstafford1]

Well technically anything that gives it a longer straighter shot into the intake will help some. I don't thing causing the air to rotate would really do anything more.

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[silverbullitt51]

Originally Posted by DonJuan16

I am confused on how this one would work. I thought really the only way that they worked at all was from the ridges on the inside of it rotating the air.

From what ive read those stupid little baffles dont do anything but disrupt the airflow and make it bounce around more, i think its just a sales gimmic. i went with the smooth one just to increase the amount of air in the manifold. and if you think about it, how would the "spinning" air really keep spinning all the way down into the cylinder? because once it leaves the spacer it has to be seperated into 6 differenct cylinders and thus the spinning effect would be lost, well thats assuming im thinking of it right

[jstafford1]

I might pick up one of these. While the 25-30hp/20+tq claims are obviously insane a little more throttle response and any mpg bump would be nice. If I get one I'd go for the 1in smooth bore.

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[silverbullitt51]

Originally Posted by jstafford1

I might pick up one of these. While the 25-30hp/20+tq claims are obviously insane a little more throttle response and any mpg bump would be nice. If I get one I'd go for the 1in smooth bore.

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I was looking at the 1 inch one too, but was reading how some engines respond differently to different size spacers, like I read somewhere that the 302 doesn't do well with a 1 inch. Plus I was looking at the way the throttle hooks up with the cords and if I used a 1 inch one the the cab.es would reach the throttle body without lengthening them

[DonJuan16]

Anybody know the realistic hp and mpg increase you would actually get from one of these. Obviously the 30hp etc they state you will get is exaggerated

[jstafford1]

Originally Posted by DonJuan16

Anybody know the realistic hp and mpg increase you would actually get from one of these. Obviously the 30hp etc they state you will get is exaggerated

This is a guess...but I would say no more than 2 for either....but throttle response should be better though, which with most of us that means worse mpg cause we're on it more lol.

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[MaximusNeo701]

If you want to get technical on those smooth vs non smooth throttle bodies. Anything that isn't smooth has more surface area so more air would come in contact with it causing more friction and therefore slowing down some of the air. Also friction causes heat, though friction of air against itself and the sides of the intake are neglible.

I would assume that adding more length to the intake would hurt performance since the engine has to overcome more friction and distance when pulling air in.
Though in theory it makes sense that the speed of the air moving through the spacers would be faster since its not coming right out of the curve this is most likely incorrect since its a low pressure system. The air in front (going into the engine itself) is pulled into the engine at speed x and the pressure outside of the intake is higher than inside the intake so the air is actually pushed into the intake and forward to let more into the intake to equalize the system. So regardless the speed of the air should be the same no matter how close the bend is to the throttle body, its only slowed down my friction.

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[silverbullitt51]

Originally Posted by DonJuan16

Anybody know the realistic hp and mpg increase you would actually get from one of these. Obviously the 30hp etc they state you will get is exaggerated

no more than 5 on a very good day with perfect conditions but i knew that going it, i didnt know that it would make the car sound better (deeper exhaust note and sucking noise from engine) so thats just an added bonus and like before mentioned it does add a slight bit of jump to the throttle when you tap it, as for gas mileage...yeah i cant keep my foot out of it so no real world experience yet but maybe 1-2 if your really lucky

[silverbullitt51]

Originally Posted by MaximusNeo701

If you want to get technical on those smooth vs non smooth throttle bodies. Anything that isn't smooth has more surface area so more air would come in contact with it causing more friction and therefore slowing down some of the air. Also friction causes heat, though friction of air against itself and the sides of the intake are neglible.

I would assume that adding more length to the intake would hurt performance since the engine has to overcome more friction and distance when pulling air in.
Though in theory it makes sense that the speed of the air moving through the spacers would be faster since its not coming right out of the curve this is most likely incorrect since its a low pressure system. The air in front (going into the engine itself) is pulled into the engine at speed x and the pressure outside of the intake is higher than inside the intake so the air is actually pushed into the intake and forward to let more into the intake to equalize the system. So regardless the speed of the air should be the same no matter how close the bend is to the throttle body, its only slowed down my friction.

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well yeah that makes sense it would in theory hurt the performance but what about those cai kits that are super long and go down under the fender. i would agree that the effects would be better with a forced set-up, but im not 100% sure yet how they work im still researching, i was just posting what i noticed from my experience

[MaximusNeo701]

Originally Posted by silverbullitt51

well yeah that makes sense it would in theory hurt the performance but what about those cai kits that are super long and go down under the fender. i would agree that the effects would be better with a forced set-up, but im not 100% sure yet how they work im still researching, i was just posting what i noticed from my experience

Most of the ones I have seen like that compensate for the excess friction by pulling in colder air which is denser, being farther away from the heat source. Though the speed of the air overall shouldn't be affected that much by the friction, but in a case were air moves through the longer piping faster you got a lot of noise and extra heat generation. Think of speaker boxes and ports, the air will inevitably move through a smaller port but with port noise and sometimes in extreme cases cone turbulence (when the pressure can't equalize fast enough and there is a delay). In all honestly its all in such small amounts you will never notice the difference between one that's smooth vs one with baffles or blades or even one that 6inches long vs 9 inches long considering how high air pressure forcing air into intake.

My understanding is the spacer provides more air at the tb basically on demand and is not waitkng om the delay between the drop in pressure inside the intake and for fresh air to be pushed into the intake.

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