To make a long story long:
My cat was plugged badly, and from all indications, had been for a long time. I think it was partially plugged from the factory (Rubicon ordered in Dec. '02). Brand new, the power just died above about 4000 rpm, and I averaged 14.3 mpg, with the stock 31" MTR's.
Now I've got a 2" lift and 32" tires, and a stroker, and after rodding out the cat, I'm averaging 16.2 with my foot in the floor. The stroker is the animal I had always hoped, running strong past 4500.
Have any of y'all seen this with your own rig?
Bad Factory Cat?
-
Heck
- Donator
- Posts: 57
- Joined: February 15th, 2008, 6:06 pm
- Stroker Displacement: 4.6
- Location: McCurtain County, Ok
- Contact:
Bad Factory Cat?
I NEED MORE TORQUE!
'03 Rubicon w/4.6: kb944 pistons, late 70's 4 weight crank, Mopar P4529228ab cam, 240 dur./.430 lift, barely polished head. First fire 11/14/08, no mechanical issues so far.
'03 Rubicon w/4.6: kb944 pistons, late 70's 4 weight crank, Mopar P4529228ab cam, 240 dur./.430 lift, barely polished head. First fire 11/14/08, no mechanical issues so far.
-
Mgardiner1
- Donator
- Posts: 574
- Joined: August 2nd, 2008, 6:19 pm
- Stroker Displacement: 284 CI
- Location: Wading River, NY
Re: Bad Factory Cat?
no, but i'm jealous, cause i've got a 4" lift and 33s, i can't get better then 13 mpg when i'm pussy-footing it....
oletshot wrote:....and silvolites are only cast not hypericantspellits.
-
dwg86
- Donator
- Posts: 1204
- Joined: February 13th, 2008, 6:20 pm
- Stroker Displacement: 4.6
- Vehicle Year: 2003
- Vehicle Make: Jeep
- Vehicle Model: Wrangler
- Location: Atlanta, Ga
Re: Bad Factory Cat?
Hey Mike, what gears are you running?
-
yuppiexj
- Donator
- Posts: 319
- Joined: February 13th, 2008, 7:31 pm
- Stroker Displacement: 4.5 needs assembly
- Location: Fredercksburg VA (land of nothing)
Re: Bad Factory Cat?
When I was running 32s on 3.55s in my 3/5" lifted XJ I got 13-14mpg.dwg86 wrote:Hey Mike, what gears are you running?
I swapped in 4.56s and got 19.5-20 mixed and 22 highway.
That was on a stock 4.0 renix with 150K miles, my home built front bumper weighed in at ~200lbs.
I did have the correct speedo gear for both setups.
Passing power was much better, it rarely shifted down at 60+, very light throttle was required to reasonably accelerate or maintain any speed.
Not meant to be a hijack just possibly helpful info.
TurboTom wrote:i will eat my words later if need be.
Proud owner of many stroker parts, that have not yet spontaneously assembled themselves.TurboTom wrote: Not sure of your rules...but you need to start with an engine that works best for the rules and cheat from there!
-
dwg86
- Donator
- Posts: 1204
- Joined: February 13th, 2008, 6:20 pm
- Stroker Displacement: 4.6
- Vehicle Year: 2003
- Vehicle Make: Jeep
- Vehicle Model: Wrangler
- Location: Atlanta, Ga
Re: Bad Factory Cat?
Yes, was helpful...thanks
-
Mgardiner1
- Donator
- Posts: 574
- Joined: August 2nd, 2008, 6:19 pm
- Stroker Displacement: 284 CI
- Location: Wading River, NY
Re: Bad Factory Cat?
4.10 gear ratio w/33" tires. I think i'd be better off with 4.56's but i just built this ford 8.8 and am not gonna dump money into another gear set now.
oletshot wrote:....and silvolites are only cast not hypericantspellits.
Who is online
Users browsing this forum: No registered users and 17 guests