Throttle Body Spacer

[miked808]

I was just sitting around daydreaming about an All Motor Mustang I used to drive back in High School and I remembered about one of the Mods I did on it. It was a Throttle Body Spacer and I remember it gave good gains but I don't remember seeing anything about one for the 240 so I did some searching and saw this.

I'm waiting for a Bored Throttle Body now so I think I'm gonna pick this up and have it enlarged for my New TB and I'll post before and after results. But I'll tell you guys now that will be a while.http://www.graytechsoftware.co...?ID=1

[9240sx]

I know that Throttle Body Spacer add Hp,My friend had one on his LS1,But how does it work in making more Hp???Im not to clear on that.

[DjPantsSpecR]

you know, the best i can come up with, and at this point it doesnt make any sense to me, but here it is: It adds volume to the plenum. A good rule of thumb for building intake manifolds, is that the plenum should be about 2 times as large as the motor.

does your stock plenum look like its 5liters? it aint.

But, right now i cant figure out why adding a bit of volume to the plenum would increase anything, but i know it does as ive seen these gains too..

is there something else to it, like aventuri or something?

edit: i checked out that site, adn it seems the biggest gains here are from port matching the TB to the intake plenum. I wonder how effective the spacer is (everyone should get a new intake manifold made anyway...), but the main point is you can port match your plenum to the TB right now and see if that helps out any

[miked808]

The stock Manifold is already port matched to the stock TB. I'll let others chime in on how it makes power but on Truck and some other Domestic sites where they use spacers the TB spacers have Grooves and Spirals to create a Venturi effect so I was gonna get the local Machine Shop to Enlarge and possibly copy cat some other manufactuers design. Example http://www.streetandperformanc...p.htm

[DjPantsSpecR]

is the stock manifold matched to the stock TB? how i interpreted what i read from the install directons is that the spacer is port matched to the 60mm tb, but the intake plenum opening is only around 50mm. right? isnt that what its saying?

carb spacers make sense, because they physcially change runner length, but i dont under stand how adding a tiny bit of plenum volume can help...

edit: duh, i can ****ing read... i should know nissan isnt stupid enough to put a 60mm TB on a 50mm port.... I didnt read far enough at the top to see that this particular part was for L series datsuns, and that instal is for such

[MidnightMotorsportS14]

Its a way of getting a little more Un-metered air volume into the engine...thus HP.

[Red coupe]

how is it getting un metered air? its after the maf?And it can seriously just be a way to lean out the engine could it?

[DjPantsSpecR]

ha, you want unmetered air? just unplug the big tube going to your intake. it goes to your iacv. try making your car idle without it... you will run lean adn you wont idle. i would say its a nice thought, but i dont even know where you are going with it

It has nothing to do with leaning out the motor either, if thats what you are asking? this is all jsut confusing

[rsmithdrift]

Wait a minute.............Those actually work??!! WTF??!!

No.......you have got to be joking...........it's unfathomable. All it does is move the tb out an inch or so and this increases power?? Wierd.

These have been proven to work you say?? Ok. that's baffling. But if it's been proven on the dyno........you can't argue with that I guess.

[TheOne]

on mustang GT's it has been proven, and maybe on old sbc's.

now sure on this 1 though, anybody wanna be a guinea pig?:P

[Aworkinprogress]

My second car is a 69 ford galaxie and I put a carb spacer and recieved more mid power from my old 351w. The pamphlet that edlebrock put in with it said it help atomize the fuel with air and speed up the flow.... But our 240's have fuel injection hmmm I geuss it just speeds up the flow then on fuel injection and gives it a swirl motion.

[DjPantsSpecR]

carb spacers are different. They physically modify the runner length which will change where power is produced

this TB spacer only provides a little bit of volume to the plenum, which the stock intake manifold is lacking, but it will not make that big of a difference by increasing plenum volume as opposed to runner length

[Red coupe]

yeah, I cant think of how these would work to do much on a 240...on a throttle body injected, or carbed car yeah ok, but on the 240...

[punxva]

actually it makes more power beacuse its making the path traveled by the air a little longer which gives it more time to drop the temperature a few degree's, thats in theory tho, unless you've got a CAI then you probably wont see too bug of a gain.

[mkory]

That doesn't make any sense. Seems like, if anything, the intake mainfold will heat up the air as it comes in.

[DjPantsSpecR]

especially if you havent removed the coolant line for the throttle body.

however the instructions show you two ways of hooking the coolant line up to your TB, so im pretty sure that theory is not the same theory they are using....