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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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#23 of 39 joe110 by marsha7 Jun 01, 2006 (5:28 pm)
Replying to: joe110 (May 28, 2006 4:46 am) Pardon my ignorance, but who did the flashing of the computer, how is it done, and just how does it "improve" the HP and performance???...it can't change the compression or the internal engineering of th enginbe, so how does performance improve???...thanks... Replies to this message: joe110 (Jun 03, 2006 4:52 am) turbo301 (Jun 04, 2006 3:10 pm) rhill7 (Jan 01, 2007 12:26 pm)
#24 of 39 Re: joe110 [marsha7] by joe110 Jun 03, 2006 (4:52 am)
Replying to: marsha7 (Jun 01, 2006 5:28 pm) You are not being ignorant. Every car since the 90's are controlled by an ECM. Lets just use Ford for obvious reasons. I was told by SCT that our computers are compatible in more than one car. Its just tuned by the factory with a factory setting. For Ex- my computer can be used in a Excursion or a Lincoln LS. It just needs to be programmed by the factory. The rest you should be able to figure it out. Sure, a bigger cam or higher compression can increase the HP, but you should still tune the ECM to get all you can out of the engine. As far as flashing, you have to buy the flash device. It may be used or new. Mine was new at 425 bucks. Go to DP-Tuner.com. He sells new and used Flash devices. Or buy a Fast ford and Mustang mag. Look for flash devices in the mag. There are all kinds. I just plug SCT because I was referred by a Mustang user and tried it. I spoke to him last week and his brother works for a ford dealer. He got a used ECM and was playing with the programs. He was giving it to my buddy with the mustang to try out. Good luck.
#25 of 39 Re: joe110 [marsha7] by turbo301 Jun 04, 2006 (3:10 pm)
Replying to: marsha7 (Jun 01, 2006 5:28 pm) "Flashing", or reprogramming, the car's engine control computer adjusts things that are vacuum or mechanically operated in older cars: things like the timing, fuel/air mixture, idle speed, etc. are all adjustable, and all affect engine performance, life and fuel economy. Different vehicles and vehicle types benefit from different values for the various parameters, but using a common, programmable computer in multiple vehicles helps keep the cost down .
#26 of 39 Suspension parts Upgrades by abfisch Dec 07, 2006 (12:05 pm)
Have any of you changed the shocks to high performance shocks or changed the bushing to PU??/ Interested in buying a used CV and working on it myself, and wondering if anyone in this forum has done this. I have done this on my 02 Toyota Avalon with dramatic results.   abfisch
#27 of 39 Reprogramming Shift Points on 2006 GM by rhill7 Jan 01, 2007 (12:10 pm)
I just bought a left over 2006 GM with the handling, 3.27 rear axle, and dual exhaust package. I am happy with the power, but I would like to change how the transmission shifts and locks up. On my last car with OBDI, I was able to change the start in second gear so that with the shift lever in "2", it would start in first and then shift to second and then stay in second until I moved the shift lever to "D". I was also able to delay the shift to Overdrive and the convertor lockup to what I thought were acceptable speeds to avoid lugging the engine. I know that I can try to train my wife to use the "Overdrive Off" button in the column shift lever, but I'd like to avoid that if possible by reprogramming the transmission shift points.   Does anyone know who sells a program for editing the transmission shift points and lockup points? Or is that available commercially for this car? I'd like to do my own programming if possible so that I can make adjustments until I get it where I want it without having to send a computer back to a tuning person several times.   Or, what tuning persons work on our cars?   Thanks in advance. RHill
#28 of 39 Re: joe110 [marsha7] by rhill7 Jan 01, 2007 (12:26 pm)
Replying to: marsha7 (Jun 01, 2006 5:28 pm) The Electronic Control Module (ECM or "Computer") typically has a program with instructions like "If the throttle position sensor is greater than X% and the manifold pressure is greater than P, then set ignition advance to A and the fuel flow to F". The values of X, P, A, and F are found in tables which can be edited. Editing the tables can make use of premium fuel and provide more power if you decide to use premium fuel. Editing the shift point tables can also make the car perform more aggressively by keeping the transmission in a lower gear for longer. Other significant improvements to the car's performance will probably involve the traditional increase intake airflow and exhaust flow and cubic inches. Or increase airflow by supercharging and fuel energy with nitrous, etc. Most modifications will involve computer table modifications to get the most out of them.   To modify the computer tables, typically you copy the program/tables from your car to a laptop or destop computer, edit the tables, and then load them back into your car's computer "Flash the computer".   For what it's worth and your mileage may vary.
#29 of 39 Wanted - Mechanical info for 98 Mercy Grand Marquis auto repair. by wearewellable Jan 06, 2007 (9:38 am)
Our 1998 Grand Marquis 4.6 liter V8 has a small crack on top of intake where the thermos goes. Apparently it is plastic and to buy the part is supposed to be over $200. Is there a way to repair the small crack? Husband needs advice. Replies to this message: euphonium (Jan 06, 2007 8:40 pm)
#30 of 39 Re: Wanted - Mechanical info for 98 Mercy Grand Marquis auto repair. [wearewellable] by euphonium Jan 06, 2007 (8:40 pm)
Replying to: wearewellable (Jan 06, 2007 9:38 am) Check with dealer. That may be the intake manifold that has a factory recall order.
#31 of 39 Crown Victoria Gauges by chrismiller2 Jan 21, 2007 (4:24 pm)
I have a 1999 Ford Crown Victoria and was wondering if the gauge cluster of a newer model crown victoria such as the 2006 with the tachometer would work in the 1999.   Thanks for helping, if you can.
#32 of 39 Re: Question about dual exhaust [joe110] by royf Feb 01, 2007 (9:46 am)
Replying to: joe110 (Apr 04, 2006 1:21 pm) Hi Joe: I own a 04 CV Sport that came with dual exhaust. Each bank on your engine has a cat before it goes into a single pipe. I owned an 04 Cv with a single exhaust & had duals put on it.No problems at all & you will see a marked increase in performance with the duals.

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