Air intake mods? Which one?

james wrote:
> Question for all you auto buffs. Ive got a 95 Jeep grand cherokee.
> It has come to my attention that it might be possible to increase Fuel
> Economy by adding one of these mods from ebay. Can you give me your
> opinion on the following:
> 1) can you use one of these "performance modules" in conjunction with
> an air intake device?

AVOID the "performance modules".

> 2)There are a bunch of K&N air intakes, Imitation K&N intakes, this
> "vortex" device, this "tornado" device among others. I am interested
> in increasiing my MPG

Er ?

These devices are designed to give you MORE power.
If you've got more power, then you're using more fuel to get it !

> but not interested in paying upwards of 150 for
> a K&N. Can anyone recommend one of the imitation ones such as this
> one
>
http://cgi.ebay.com/ebaymotors/ws/eB...m=2467691 696
> or the vortex which are both considerably less, but seem to have a
> similar design? Any input?

If it does what it's supposed to do, it'll let more air into your engine, so
your Engine Management will inject more fuel, and you'll go faster. Quite
obviously this is not going to improve your fuel economy.

If it does NOT do what it's supposed to do, it'll let the same air into your
engine, so your Engine Management will inject the same amount of fuel, and
you'll go at the same speed. Quite obviously this is not going to improve
your fuel economy.

> 3)Are there any other relatively inexpensive ways to get more milage
> for my gas?

Use your head. Performance-mods are quite obviously not going to increase
your fuel economy !!!!

> I dont feel like getting stung as badly by these gas
> prices.

So why are you driving a stupid great Jeep then ?!?!?!?

Is this actually a serious post ?

"james" > wrote in message
m...

> 3)Are there any other relatively inexpensive ways to get more milage
> for my gas? I dont feel like getting stung as badly by these gas
> prices.
>

If there were the automakers would have already have them in use.

Ted

"james" > wrote in message
m...

> 3)Are there any other relatively inexpensive ways to get more milage
> for my gas? I dont feel like getting stung as badly by these gas
> prices.
>

If there were the automakers would have already have them in use.

Ted

In rec.autos.makers.chrysler james > wrote:
I'm not reading the rest of the thread because this kind of questions
always end in religious wars between people.

My experience with a '91 Jeep Cherokee 4.0 and a 1997 Dodge Stratus 2.5
are that in order to get better mileage you can
- replace the muffler for a better one (absorption). This doesn't have to
be one that makes more sound. A good exhaust shop will give you the one
with the sound you like/want/need/whatever.
- replace the airfilter with a K&N or likewise.
- stay away from whirls in your intake
- only do chipmodding if you want to have more power and don't mind the
worse mileage.

My Jeep Cherokee had a 15% better mileage afterwards. My Stratus does 8%
better (which is still 50% better than the Jeep anyway).
The muffler is your first bottleneck for the 4.0 and 5.2. The 'only' reason
the 5.9 has more then 5.9/5.2 better performance is because the muffler
was also replaced in the factory.
The muffler/intake swap will work on cars if both are bottlenecks. Of your
cat is the bottleneck replacing the muffler won't help a bit.

What you want is to mod/tune your car in order to get rid of bottlenecks
as they cost you fuel. Chiptuning or turbo'superchargers are to get more
performance not-matter-what.
Chiptuning does work on small european turbodiesels. But that is because
a dieselengine sucks and needs to be tuned anyway.

Just my 2 eurocents (over 20% better than yours)
Martin




> Thanks alot,
> James

In rec.autos.makers.chrysler james > wrote:
I'm not reading the rest of the thread because this kind of questions
always end in religious wars between people.

My experience with a '91 Jeep Cherokee 4.0 and a 1997 Dodge Stratus 2.5
are that in order to get better mileage you can
- replace the muffler for a better one (absorption). This doesn't have to
be one that makes more sound. A good exhaust shop will give you the one
with the sound you like/want/need/whatever.
- replace the airfilter with a K&N or likewise.
- stay away from whirls in your intake
- only do chipmodding if you want to have more power and don't mind the
worse mileage.

My Jeep Cherokee had a 15% better mileage afterwards. My Stratus does 8%
better (which is still 50% better than the Jeep anyway).
The muffler is your first bottleneck for the 4.0 and 5.2. The 'only' reason
the 5.9 has more then 5.9/5.2 better performance is because the muffler
was also replaced in the factory.
The muffler/intake swap will work on cars if both are bottlenecks. Of your
cat is the bottleneck replacing the muffler won't help a bit.

What you want is to mod/tune your car in order to get rid of bottlenecks
as they cost you fuel. Chiptuning or turbo'superchargers are to get more
performance not-matter-what.
Chiptuning does work on small european turbodiesels. But that is because
a dieselengine sucks and needs to be tuned anyway.

Just my 2 eurocents (over 20% better than yours)
Martin




> Thanks alot,
> James

Paul_N wrote:
> K/N filter does not help your fuel consumption nor improve Hp either.
> I have K/N just for re-use purpose only. Perhaps tires
> Jeep has always known for hard on gas. So there is not much you can
> do.

If a K&N filter is any more efficient you should get a bit more torque and
thus be able to change up sooner. But I agree that it's likely that there's
very little to no difference in performance from a new OEM filter.

Paul_N wrote:
> K/N filter does not help your fuel consumption nor improve Hp either.
> I have K/N just for re-use purpose only. Perhaps tires
> Jeep has always known for hard on gas. So there is not much you can
> do.

If a K&N filter is any more efficient you should get a bit more torque and
thus be able to change up sooner. But I agree that it's likely that there's
very little to no difference in performance from a new OEM filter.

"Nom" > wrote in message
...
> james wrote:
> > Question for all you auto buffs. Ive got a 95 Jeep grand cherokee.
> > It has come to my attention that it might be possible to increase Fuel
> > Economy by adding one of these mods from ebay. Can you give me your
> > opinion on the following:
> > 1) can you use one of these "performance modules" in conjunction with
> > an air intake device?
>
> AVOID the "performance modules".
>
> > 2)There are a bunch of K&N air intakes, Imitation K&N intakes, this
> > "vortex" device, this "tornado" device among others. I am interested
> > in increasiing my MPG
>
> Er ?
>
> These devices are designed to give you MORE power.
> If you've got more power, then you're using more fuel to get it !
>
> > but not interested in paying upwards of 150 for
> > a K&N. Can anyone recommend one of the imitation ones such as this
> > one
> >
>
http://cgi.ebay.com/ebaymotors/ws/eB...m=2467691 696
> > or the vortex which are both considerably less, but seem to have a
> > similar design? Any input?
>
> If it does what it's supposed to do, it'll let more air into your engine,
so
> your Engine Management will inject more fuel, and you'll go faster. Quite
> obviously this is not going to improve your fuel economy.
>
> If it does NOT do what it's supposed to do, it'll let the same air into
your
> engine, so your Engine Management will inject the same amount of fuel, and
> you'll go at the same speed. Quite obviously this is not going to improve
> your fuel economy.

Performance mods can increase your fuel economy.. If the engine can use
what it has more efficiently, then you'll get better gas mileage. In other
words, if you can get more power out of the same amount of fuel, then you're
likely to get better gas mileage. I figure a muffler swap could do this. A
more free flowing exhaust can give you better gas mileage.

Of course, I have to agree with you that he shouldn't be driving a Jeep if
he wants gas mileage.

-Bruce

"Nom" > wrote in message
...
> james wrote:
> > Question for all you auto buffs. Ive got a 95 Jeep grand cherokee.
> > It has come to my attention that it might be possible to increase Fuel
> > Economy by adding one of these mods from ebay. Can you give me your
> > opinion on the following:
> > 1) can you use one of these "performance modules" in conjunction with
> > an air intake device?
>
> AVOID the "performance modules".
>
> > 2)There are a bunch of K&N air intakes, Imitation K&N intakes, this
> > "vortex" device, this "tornado" device among others. I am interested
> > in increasiing my MPG
>
> Er ?
>
> These devices are designed to give you MORE power.
> If you've got more power, then you're using more fuel to get it !
>
> > but not interested in paying upwards of 150 for
> > a K&N. Can anyone recommend one of the imitation ones such as this
> > one
> >
>
http://cgi.ebay.com/ebaymotors/ws/eB...m=2467691 696
> > or the vortex which are both considerably less, but seem to have a
> > similar design? Any input?
>
> If it does what it's supposed to do, it'll let more air into your engine,
so
> your Engine Management will inject more fuel, and you'll go faster. Quite
> obviously this is not going to improve your fuel economy.
>
> If it does NOT do what it's supposed to do, it'll let the same air into
your
> engine, so your Engine Management will inject the same amount of fuel, and
> you'll go at the same speed. Quite obviously this is not going to improve
> your fuel economy.

Performance mods can increase your fuel economy.. If the engine can use
what it has more efficiently, then you'll get better gas mileage. In other
words, if you can get more power out of the same amount of fuel, then you're
likely to get better gas mileage. I figure a muffler swap could do this. A
more free flowing exhaust can give you better gas mileage.

Of course, I have to agree with you that he shouldn't be driving a Jeep if
he wants gas mileage.

-Bruce

One problem with all of this:

If you are running a fuel injected, computer controlled
engine, the ONLY way to get better mileage or power is to
modify the computers to be compatable with your modification.

Any modifications that you make won't do a bit of good
unless it is so significant as to override the engine's
ability to compensate. (then you have other problems)

On an old Chevy with a pair of Weber carbs - sure -
completely different story.