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Ford Crown Victoria/Mercury Grand Marquis: Modifications

39 messages,  Last post on Jun 22, 2009 at 4:22 PM

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What is this discussion about? Ford Crown Victoria, Mercury Grand Marquis, Performance Mods, Exhaust, Sedan

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#2 of 39 Question about dual exhaust by joe110 Apr 04, 2006 (1:21 pm)
Hello to all! Totally new to all this. I own a 2005 Crown Vic P74. I recently had it tuned by SCT (computer flash Excal 2)and it runs really strong. I currently have single exhaust. I want to have duals put on it with Flowmasters. If I do this, does anyone know if it will throw the computer off and make it run like crap. "> Replies to this message: euphonium (Apr 04, 2006 6:05 pm) dekester (Apr 05, 2006 4:20 pm) turbo301 (Apr 07, 2006 1:37 pm) and 1 more... joe110 (Apr 07, 2006 1:36 pm) joe110 (Apr 08, 2006 8:22 am) royf (Feb 01, 2007 9:46 am)
#3 of 39 Re: Question about dual exhaust [joe110] by euphonium Apr 04, 2006 (6:05 pm)
Replying to: joe110 (Apr 04, 2006 1:21 pm) Very likely. Remember your on board computer is programed for one cat sensor and if duals are installed, then what? Replies to this message: dekester (Apr 05, 2006 4:20 pm) turbo301 (Apr 07, 2006 1:37 pm) joe110 (Apr 08, 2006 8:26 am) joe110 (Apr 07, 2006 1:36 pm) joe110 (Apr 08, 2006 8:22 am)
#4 of 39 Re: Question about dual exhaust [euphonium] by dekester Apr 05, 2006 (4:20 pm)
Replying to: euphonium (Apr 04, 2006 6:05 pm) When did they change to a single cat? MY 84 Crown Vic had dual cats and then a "Y" pipe into a single exhaust. When I had the cats replaced under a recall in 1990, I had the dealer put on a dual system. No problems at all with it.   Haven't gotten underneath my 03 Grand Marquis yet to have a look-see.   Deke Replies to this message: turbo301 (Apr 07, 2006 1:37 pm) joe110 (Apr 08, 2006 8:26 am)
#5 of 39 Re: Question about dual exhaust [euphonium] by joe110 Apr 07, 2006 (1:36 pm)
Replying to: euphonium (Apr 04, 2006 6:05 pm) I spoke with SCT today. They said when you install the duals, you have to flash the computer to turn off the sensor. Sometimes you can get by without turning it off.
#6 of 39 Re: Question about dual exhaust [dekester] by turbo301 Apr 07, 2006 (1:37 pm)
Replying to: dekester (Apr 05, 2006 4:20 pm) Don't forget, though, that it's much easier to change stuff like that on the old carbureted cars. With all of the computers and sensors on new cars, some traditional tricks may hurt performance rather than help, if they're not thought through very carefully.   On that note, though, I could have sworn that my '04 has dual cats, connected through a Y-pipe to the single exhaust. Did this change for '05? Replies to this message: joe110 (Apr 08, 2006 8:26 am)
#7 of 39 Re: Question about dual exhaust [euphonium] by joe110 Apr 08, 2006 (8:22 am)
Replying to: euphonium (Apr 04, 2006 6:05 pm) I spoke to the SCT dealer and he told me if I put duals on my car, he could get me a stock tune for the Excal 2 that would disable the o2 sensor if needed. Its a standard procedure. But for me to see how the car runs first before changing anything.
#8 of 39 Re: Question about dual exhaust [turbo301] by joe110 Apr 08, 2006 (8:26 am)
Replying to: turbo301 (Apr 07, 2006 1:37 pm) My 05 crown has dual cats. I always thought they came with dual cats. I have duals into one pipe.
#9 of 39 Chrome differential cover by joe110 Apr 08, 2006 (8:38 am)
I just installed a chrome diff cover. For anyone else who wants one, go to Jegs.com. The rear of choice should be a 8.8 10 bolt. There is no listing for a crown vic. You have to match it up as a mustang GT. Looks nice too. Paid 33.98 delivered. Replies to this message: marsha7 (Apr 08, 2006 4:48 pm) joe110 (Apr 09, 2006 2:32 am) marsha7 (Apr 09, 2006 2:41 pm) p100 (Apr 09, 2006 8:25 pm)
#10 of 39 joe110 by marsha7 Apr 08, 2006 (4:48 pm)
Replying to: joe110 (Apr 08, 2006 8:38 am) It the rear diff cover just flat chrome, or is it cast with heat dispersing fins??? Replies to this message: joe110 (Apr 09, 2006 2:32 am) marsha7 (Apr 09, 2006 2:41 pm) p100 (Apr 09, 2006 8:25 pm)

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