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Port injection
The TB spacer is meant to keep the throttlebody cooler, by seperating it from the manifold using a phenolic material instead of metal. The misconception is that by adding space behind the TB, you are going to get more torque.
The lowered temperature is fine, and is worthwhile (see TB coolant bypass), but the cost of a spacer and the remaining intake manifold temperature doesn't do a whole lot on its own. The performance myth with this device is that it allows more air in, or that it lengthens the runners, or anything else along these lines.
The torque curve is dependent on a lot of things, but for the TB related part, its actually not even related. The plenum, while connected to the runners, aren't part of the runner equation. You would have to lengthen the runners themselves to do anything. Actually, even this doesn't seem to work from testing on a 3100 with 1" spacers between the lower and upper intake. You would likely have to change the volume of the runners much more than just extending them will do.
Regardless, this has nothing to do with the plenum. The plenum volume is important to performance and the RPM range of the powerband, but the TB spacer isn't going to have any effect on this because its volume is minimal.
The only real value to a Throttle Body spacer is for a NOS setup. You can drill a hold in the spacer for a NOS injector. It is easier to work with a seperate piece for the nitrous injector, and it is easier to return the car to normal later.
TBI, Carb
Unlike the port injected manifolds, a spacer that goes under the carb or throttlebody will help out for performance. The extra space will help the air fuel mixture atomize, which will burn more efficiently. The myth part is for the port injected motors only.
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All times are GMT -4. The time now is 07:48 AM.
When the intake was bone stock at certain driving speeds I would have to put my foot to the floor to get the tranny to downshift and give me more power, even with a custom ram air which i installed didnt change the pedal effort much but there was a noticable gain in power.
The ram air causes much more of a dramatic responce with the throttle spacer in my experiences. Speeds where it would previously need full throttle to down shift I now only have to use about half the pedal effort to get the same result and instead of having to hold the pedal almost 1/4 of the way down to hold my speed at 120 kph(75 mph approx) i now just need to hold it at a light press as if i was doing city speeds. Not only that the motor honestly pulls noticably harder with the set up i have on it, with a light tap of the pedal the motor revs as if my foot's sunk into the accelerator and prior to the modifications I would need close to a 1/4 pedal depress to get the motor to light up and scream the way it does. My friend has a
02 GT Grand Prix that car has a 3.8 and the past few times we lined our cars up I actually got the better of him and began to pull away..When my motor was bone stock he would have a feild day with me pulling away with ease and since its not been the case and his car is in perfect working order too.