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Ford Crown Victoria/Mercury Grand Marquis Modifications

joe110joe110 Posts: 19
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. ">
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Comments

  • euphoniumeuphonium Great Northwest, West of the Cascades.Posts: 3,305
    Very likely. Remember your on board computer is programed for one cat sensor and if duals are installed, then what?
  • dekesterdekester Posts: 322
    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
  • joe110joe110 Posts: 19
    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.
  • turbo301turbo301 Posts: 73
    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?
  • joe110joe110 Posts: 19
    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.
  • joe110joe110 Posts: 19
    My 05 crown has dual cats. I always thought they came with dual cats. I have duals into one pipe.
  • joe110joe110 Posts: 19
    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.
  • marsha7marsha7 Posts: 3,661
    It the rear diff cover just flat chrome, or is it cast with heat dispersing fins???
  • joe110joe110 Posts: 19
    Its just flat chrome. The ones you are talking about are like 180 bucks or so. Polished aluminum I think.
  • marsha7marsha7 Posts: 3,661
    I was pricing one out for my Ram 1500, and it was over $200
  • p100p100 Posts: 1,116
    Keep in mind that aluminum dissipates heat three times faster than stamped sheet metal. Therefore, finned aluminum transmission pans and differential covers are the best.
  • dekesterdekester Posts: 322
    If I change my 03 to a dual system, would a crossover (or "H" pipe) help? I know this balances the sound and back pressure on other cars. Would I need to "flash" my computer? If so, where would I go to get this done?

    Since I'm younger than the usual Grand Marquis owner demographic (at elast in Florida), I want to have mine stand out from the crowd a little. Looking at some aftermarket wheels; really like the American TorqueThrust "D"( with the dark painted spokes) or the TQ II which are all polished aluminum. A little pricey, so I'm considering the old standby - Cragar S/S, but I can't get anyone to tell me what size/backspacing/offset matches the stock steel rims so I can use the tires on the car now.

    Upgrading to a set of factory LS alloys will run me about $200 per....

    Deke
  • jsylvesterjsylvester Posts: 572
    Get a set of black steelies, and put the chrome center cap, and maybe chrome trim rings. A lot cheaper than alloys, and looks "industrial" to me.
  • joe110joe110 Posts: 19
    You should have dual cats already. Take it to a muffler shop or specialty shop and tell them you want true duals put on it. You can choose whatever kind of mufflers you want. Loud or soft. Or buy your own. As far as flashing the computer, some say the car will run rough when the duals are installed and the computer needs to be adjusted. Or some say the car will run fine. At any rate, flashing the computer will give you 12-25 more HP and increased drivability. Go to SCTFlash.com and go under "products" and click on "ford products." Or speak to the guy I dealt with and ask him anything. I bought my Excal2 from him. He knows his stuff. My 05 kicks butt now. And no, Im not working for him or anything. Im just amazed at what a difference it makes on the car. Go to dp-tuner.com. Just tell him what you want out of your engine. Good luck!
  • dekesterdekester Posts: 322
    If I do that, it'll just look more like an unmarked SHeriff's cruiser. Mu GM is Aspen Green with dark tinted windows. I fool people sometimes when they look quick, but once they see the crome grille and rear end reflector, they realize is isn't what they thought it was.

    Deke
  • jsylvesterjsylvester Posts: 572
    Got it. The problem you have is they changed the wheel offset for 2003, so you cannot use any wheels designed for a pre 2003 Grand Marquis; otherwise I'd suggest the lacy spoke wheels on the 95-02 HPP/LX Sport/LSE models.

    They would be fairly easy to find used. New wheels will cost ya.
  • p100p100 Posts: 1,116
    More and more rednecks around here (central Florida) are buying old police cars at auctions and driving them everywhere. Boy, does this irritate me! As if we did not have enough real police cars around! Money is tight everywhere, so police is lurking everywhere, trying to give out as many speeding tickets as they can. All we need is these lookalike cop cars to make life more pleasant on the overcrowded roads around here.
    I saw one such car today that still had the police numbers painted on it, including big ones on the roof. It also had the spotlights in the front. Only the civilian license tag and the kid behind the wheel gave it away, as it was a fairly late model car.
  • fatpunkfatpunk Posts: 4
    so i am now the proud owner of a 93 GM its got 40k miles on it and its in close to perfect condition 2 owner car. Well my question is simple can anyone on here point me in the direction of any performance enhancements after market or oem, and with those preferably websites where parts can be ordered. i am not looking for anything drastic just maybe a 50 hp gain to get me away from the low baseline of 190....thanks for any help. :) (oh and i am not just being lazy i have actually done a bit of research and am not finding much so i figured i would ask what seems like a good community.)
  • euphoniumeuphonium Great Northwest, West of the Cascades.Posts: 3,305
    Maybe a K&N air filter system, but otherwisedue to the, onboard don't mess with, computer you have what you bought.
  • joe110joe110 Posts: 19
    I own an 05 CV and I flashed the computer. Go to DP-Tuner.com and Email this guy. Tell him what you have and what you want. He can set you up. My car went from a kinda fast car at 225hp to a real screamer. Not sure of the HP now but it feels like 270 or 280. I am looking to change the air intake because its not getting enough air now at full throttle. The other site is SCTflash.com. Click on the Ford performance tab. Also look into changing the rear to 323 or 355. I am currently checking the gas mileage and am still getting 300 miles on a tank of gas. This is what I got at the stock setting on the computer. Good luck!
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