Hello everyone:

I have a 97 TJ, and was wondering if a throttle body spacer would be a
good investment. Right now the engine is stock, and I've read that
some TBSs increase gas miles 10%, and increase horsepower as well. The
gas mileage is where it would help the most. Do these actually cause a
noticable difference, and, if so, what brands are the best?

Thanks,
Mike

"97tjMike" <MichaelJunior (AT) gmail (DOT) com> wrote

carburetor or throttle body fuel injection system. Since you have a MPI
system with injection straight into the intake manifold, just upstream of
the intake valves, this would be a total waste of time and money.

I realized some performance and economy gain, although nothing to write home
about, using Turbo City's http://www.turbocity.com Stage Two performance kit
for Jeep YJ Wrangler 2.5. The economy gain is measurable, a whole 3-4 mpg.
The performance gain is probably wishful thinking.

Earle

97tjMike wrote:
TB spacers are pure junk.

The changes in "horsepower" or "feel" are due to the shifting of the
linkages. Essentially shortening them so the throttle is open a bit more
earlier in the pedal and the kickdown for the transmission is also
changed a small amount.

The only possible benefit is a thing called hemholtz tuning, but that is
only valid at specific RPMs and is not a trivial calculation.

Way back when, carb spacers were used to shield the carb from engine heat
and allowed a more dense charge. These days they are just snakeoil.

I've always said if they were that good I'd bolt on ten and never need
gas again.

--
-- DougW -- 93 ZJ 4.0 http://revbeergoggles.com
HESCO Supercharger - 300W IASCA Stereo - Edelbrock IAS Shocks
Gibson Exhaust - rear DCpower - custom gauge install - Stillen Rotors
Banks Header - and BEER, in the fridge!