|
|
Jeep
4.0 & 2.5 engine bolt ons
Jeeps are wonderful,
go anywhere vehicles. In 4 cyl or 6 cyl form,
they're plenty peppy around town. And while
the 4 cyl might leave you downshifting to pass
on the highways, neither engine has been ignored
by the aftermarket. Plenty of gear exists to
boost power and torque by spinning a wrench.
Let's
start at the top and finish at the bottom.
|
|
Please
remember, this is not meant to be a comprehensive
list. It's meant to be an overview of the different
areas. Your time, budget and goals will determine
how far you follow any of these ideas. Something from
every topic will take you from a 4.0 beater, to a
5.0 eater.
|
Intake
You
want more power, let the engine inhale. Step
one is an intake.
|
|
2.5
|
|
4.0
|
An
intake like this will allow you to replace
the restrictive factory intake box. Usually
good for 5 HP or so more than stock.
|
|
This
type of kit is better at isolating the intake
from the warm, underhood air. This promotes an
increase of usually arounf 10 HP or so over stock.
You will also hear less intake noise from a system
like this. |
|
|
|
 |
Exhaust
Want
another 10 HP - 15 HP or so, let that puppy
exhale.
|
|
2.5
|
|
4.0
|
 |
|
 |
| The
4 cyl and 6 cyl engines have the same basic exhaust
needs. Though the part #s will vary, there is
the header, the cat and muffler to consider. Most
kits supply cat-back systems, and you may need
to source a downpipe as well. Banks Engineering
has been at this since diamonds were coal, so
they know their stuff. On the 4.0 engines, you
need thick flanges to avoid cracking & exhaust
leaking. |
Cooling
Yeah,
time to put on a mod with no glamour. Without
it,though, you have no-go.
|
|
2.5
|
|
4.0
|
 |
|
 |
|
Cooling
your engine is vital. Trail-use and/or towing
put heavy demands on the engine and it responds
by making more heat. heat t warp heads, crack
exhaust manifolds, fry transmissions. Heat is
your engine's enemy - this type of combo will
keep it cool as a cucumber: aftermarket, aluminum
rad, and a larger,
electric cooling fan. In some cases, you
can cool an engine too much, so do your research
and talk to the suppliers about your real-world
situation. Oh yeah, an electric fan can free
up another 5 HP - 8 HP or so for ya.
Check
out Radiator.com
- for Auto Radiators - Radiator.com stocks
radiators & ac condensers for all makes
& models, built to OEM specs for perfect
fit and quality. Low price guarantee & lifetime
warranty on all parts.
|
Forced
Induction
You
want power? You want it NOW? You want a blower!
|
|
2.5
|
|
4.0
|
 |
|
 |
| Yes,
you can turbo-charge these motors - and the kits
exist. But, if you're offroading, you want torque;
down-low torque. Turbos don't give you that. Superchargers
do. Few produce better kits than Avenger.
Kits for every need, provided your budget can
handle it - roughly $4000 USD gets you one of
these...in a box. Install is extra, though luckily,
it is actually a straight-forward bolt-on mod.
Get ready for an extra 100HP or so in your 4.0
- hope your rig is built for this. |
Snorkels
For
those serious about water, here's how not
to breathe it
|
|
2.5
|
|
4.0
|
 |
|
 |
| There's
only one supplier in the US. ARB - from Australia.
Snorkels will ensure you can ford deeper water
without you motor sucking it in from behind the
headlight. Water in engine = rebuild. Now, a down-side
is you'll be replacing air filters,d epending
on conditions, sometimes once a month. This will
actually rob the motor of a couple of HP, but
at least when you suddenly find yourself dropping
nose-first in that stream you thought was shallow,
you'll rest easy that your motor is safe. Snorkels
do require cutting holes in body-work, so they're
not for the faint of heart or the "Leasing"
crowd. |
|
|
|
