Topic: Which Throttle Body Spacer for YJ

[LST022752]

I have a 95 YJ with a 2.5L and a 4.0 throttle body. I got some extra money in my christmas budget and I wanted to pick up a throttle body spacer for it. My question is, should I get a TB spacer for a 2.5 or a 4.0? Which bore size would fit my situation the best? Also which one would you guys recomend buying? I was looking at the Hesco, AFE, and some other ones. Thanks

[dwtaylorpdx]

4.0 and buy the cheapest one you can find, its just a block of aluminum.

I dyno'd a Helix and non Helix and there was no difference in power, I used the smooth one off e-bay...

Dave

[Bounty Hunter]

Get one for a 4.0, brand doesn't matter.  I sell a smooth bore 62mm spacer for $40.

[LST022752]

I was also wondering what do you guys think of them? I've heard that they help to compliment other mods done to the 2.5. But I've also heard that
they dont do anything.

[dwtaylorpdx]

What it does  is move your power band, down, and increases torque slightly.

My engine is built up, after the new high compression, cams etc, My power was
coming in at 3200 and it would pull to about 6500. Without the spacer.
With the spacer it comes in at about 2400 and pulls to about 5500.

Much better off idle response as well.

On a stock engine with nothing done I would not expect to feel much difference,
with the 4.0 throttle body you should have a small bump in torque anda little flatter
curve so you can stay in a gear longer on a steep hill. Nothing earth shattering.

If your engine is not running good before it wont run better after you put it in.
ANd most of the folks who say it does nothing are bucking years of hotrodding where at
the drag strip a spacer will buy you a couple 10ths in the quarter...

Dave