ponies on the cheap!

[CharlesS]

Two changes I made on my '98 that provided a noticable difference in engine idle, throttle response and gas mileage were replacing the Champion sparkplugs with a set of NGK V-Power sparkplugs and replacing the factory original 1 hole injectors with a set of Bosch 4 hole injectors.....
Engine idle has smoothed out and the gas mileage has increased by 2-3 mpg....

 

[Dr. Dyno]

Your old plugs must have been bad 'cause in the 16 years that I've owned my Jeep, I've found that the best plugs are the stock Champions.

 

[Talyn]

In the late models NGK works better.

 

[CharlesS]

Previously used the Champion Truck Plugs until they discontinued them.
Then I tried the standard Champions and found they didnt perform as well...
The NGK V Powers work very well....

 

[Lurch]

how about if i just get thicker gears and keep my carrier...any locker that's good without a whole carrier? Powertrac? I know nothing about them? Just seen them in quadratec for $300-$400. But they are only for 90-93. What's different about the 35s in a 90-93 vs. my 99? Sorry for all the ? But like I said I'm still learning

You can get an Aussie Locker for about $250 and keep the stock carrier. Best part is that you can install it yourself. Very good street manners too.

 

[mmag1982]

whats the part number of those NGK v power

 

[CharlesS]

Stock No. 7252 FR5-1
These are for the 1998 XJ 4.0L

 

[davidson99XJ]

Stock No. 7252 FR5-1
These are for the 1998 XJ 4.0L

Would these be the same for a 99? Curve runner intake with 62mm tb and spacer....if it matters which ones I should get

 

[CharlesS]

NGK V Power for your year XJ:
Part No. ZFR5N Stock No. 3459 Gap .035

 

[srmitchell]

I'm running Champion dual platinum plugs.

Single electrode/ground, however both sides are platinum tipped.

The 2000-01 uses a waste spark setup that will eat though normal plugs faster than normal.

 

[CherBear]

I'm running Champion dual platinum plugs.

Single electrode/ground, however both sides are platinum tipped.

The 2000-01 uses a waste spark setup that will eat though normal plugs faster than normal.

Like it sparks right before the intake stroke as well?

 

[Talyn]

No, like it sparks both combustion on one cylinder and exhaust stroke on the other at the same time. I.e. 1 on combustion, 6 on exhaust.

 

[Dundy]

http://en.wikipedia.org/wiki/Wasted_spark

 

[Dr. Dyno]

In the late models NGK works better.

Interesting. I wonder why. The '98 models have the same ignition system as my '92 and didn't yet have the DIS. I can understand if the NGK plugs work better on the 2000-1 models but what's the explanation for the pre-DIS models?
I've also tried triple-platinum plugs in the past and they weren't any better than the stock Champions performance-wise, but they did last 100k miles though.

 

[mmag1982]

why should the NGKs work better on 2000 models?, i heard champion RC9Y ( shorter plug nose ) ,help sollve the chronic ping/ spark knock problem.

 

[CharlesS]

The NGK V Powers certainly worked better than the standard Champions on
my 1998.

 

[davidson99XJ]

I've heard people doing mustang injectors??? What mustang....year....motor....

 

[NorCalChris]

I've heard people doing mustang injectors??? What mustang....year....motor....

http://www.naxja.org/forum/showthread.php?t=1061305

 

[NorCalChris]

These are used in newer mustangs, and everything else with the 4.6l sohc motor. These are different injectors then my tread I posted before this.

http://naxja.org/forum/showthread.php?t=1071757

Bosch 0280158064