View Full Version : what is the point of this........
02-19-2004, 03:33 PM
can anyone tell me what the point of this product is...
MAP Engineering Throttle Body Spacer Kit - $59.95
Is it worth getting for the grand am?
what are the advantages?
02-19-2004, 03:57 PM
It moves the throttle boday away from the exhaust combined with a deflector will provide colder air to the intake.
02-19-2004, 04:38 PM
Actually, the spacer insulates the TB from the heat of the manifold. It also helps to increase plenum volume, although it is only a minimal increase. They also make a heat shield.
If you ask me, the heat shield is a much better mod. I have personally tried both and there is a reason I only sell one of the two @ Doctor Speed.
Originally posted by Dr_Kyle
It also helps to increase plenum volume, although it is only a minimal increase. Certainly not worth that kind of money $$$ A bunch of gaskets would accomplish the same thing. > 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 , 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.
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