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I drove my xj with just a cat for a few weeks, and yeah it was loud (I didn't think it was ticket worthy, but unfortunately an officer disagreed 
, though I don't think he'd have pulled me over if my registration hadn't been dead), BUT I didn't notice any mpg loss or power loss other than maybe a little low-end torque... maybe. Also no check engine light.
So I guess the effect of the muffler varies from xj to xj.
Yeah the low end torque wasn't there at all.... When I got back to school the following monday, I grabbed the diagnostic computer and plugged it into my obdII port to see what the fault code was and it was the catalytic converter sensor. After I installed my muffler and dual pipes, the check engine light turned off. Weird I guessOriginally Posted by HairyPotter
I drove my xj with just a cat for a few weeks, and yeah it was loud (I didn't think it was ticket worthy, but unfortunately an officer disagreed , though I don't think he'd have pulled me over if my registration hadn't been dead), BUT I didn't notice any mpg loss or power loss other than maybe a little low-end torque... maybe. Also no check engine light. So I guess the effect of the muffler varies from xj to xj.
Does pullin the plastic venturi tube from the air tube at the air box really provide a measurable increase of airflow to the throttle body, does it result in a measureable performance improvement?
Ok, ill start looking into these.
The mpg test will come first. And the dyno test will have to be later as I will have to recruit test jeeps
The mpg test will come first. And the dyno test will have to be later as I will have to recruit test jeeps
Member
heres one for you..,
Why is it that in 2wd I get 14 -15 mpg and in full time 4x4 i get 17 mpg?
Why is it that in 2wd I get 14 -15 mpg and in full time 4x4 i get 17 mpg?
you should get some gains with most of that put in place,probably next to nothing with just one or two things put on.
Senior Member
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Yeah the low end torque wasn't there at all.... When I got back to school the following monday, I grabbed the diagnostic computer and plugged it into my obdII port to see what the fault code was and it was the catalytic converter sensor. After I installed my muffler and dual pipes, the check engine light turned off. Weird I guess
Are you in high school? If so I think it's awesome that some hs still have shop class. I live in Indy and I was the last class to have shop at my school Originally Posted by 1996XJSport
Yeah the low end torque wasn't there at all.... When I got back to school the following monday, I grabbed the diagnostic computer and plugged it into my obdII port to see what the fault code was and it was the catalytic converter sensor. After I installed my muffler and dual pipes, the check engine light turned off. Weird I guess
I took every one offered. Sorry I know this is off topic,btw I xj gets 15city 17hwy on a good day.
CF Veteran
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Why is it that in 2wd I get 14 -15 mpg and in full time 4x4 i get 17 mpg?
Yes! I wanna know this one too because I've been throwing her in 4 wheel whenever I can because of the money i'm saving!Originally Posted by black_police_xj
heres one for you..,Why is it that in 2wd I get 14 -15 mpg and in full time 4x4 i get 17 mpg?
CF Veteran
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Are you in high school? If so I think it's awesome that some hs still have shop class. I live in Indy and I was the last class to have shop at my school I took every one offered. Sorry I know this is off topic,btw I xj gets 15city 17hwy on a good day.
Yup! I'm a Junior and I do the vocational training program. I go to high school for two classes a day and the rest of the day is spent at a tech school where the shop is. I'm training to become a mechanic and I'm waiting on 3 certifications that are in the mail as we speak.Originally Posted by Cnwxj
Are you in high school? If so I think it's awesome that some hs still have shop class. I live in Indy and I was the last class to have shop at my school
I took every one offered. Sorry I know this is off topic,btw I xj gets 15city 17hwy on a good day.
I took a welding class last year and it was the last class before the teacher who was a vietnam vet, retired. Tons of cool stories, and I learned tons from the man.
You live in indy? My dad lives near south bend! Haha
Youre lucky you get 15-17. my stock 92 gets that but I don't drive it much since I don't live with my dad and it's parked in his garage at the moment haha
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The high school i went to has a vocational center. I enrolled in it as an adult finishing up my electricians class and getting journeymans, next is welding.100$ a class ya cant beat it.
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fortunately I can drive around all the time in 4wd. np242Originally Posted by 1996XJSport
Yes! I wanna know this one too because I've been throwing her in 4 wheel whenever I can because of the money i'm saving!
CF Veteran
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i'm jealous. lolOriginally Posted by black_police_xj
fortunately I can drive around all the time in 4wd. np242