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What mods can speed density handle?

  #1  
Old 06-22-2019, 11:50 AM
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Join Date: Dec 2017
Posts: 9
Default What mods can speed density handle?

I have a 1991 grand Marquis with the 5.0 efi and I needed a new intake and found a really good cheap ho intake and throttle body and want to know if the computer can handle these changes and I was thinking about changing the injectors from the grey ones to the 19lb orange ones but I heard that even though the injectors are grey they are still 19lb is this true is save a bundle of it is
 
  #2  
Old 06-23-2019, 11:47 AM
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Join Date: Feb 2017
Location: Phoenix, AZ., USA
Posts: 312
Default Marquis Mods

Correct replacement fuel injectors for your 5.0 V-8 are: MOTORCRAFT CM4347.
Those injectors have a large metal body that can hold heat and cause sticking problems.
I switched to the BOSCH Series 3 -- 19-lb. injector -- Orange body. These run cooler, less chance for clogging. I have over 50,000 miles on the BOSCH injectors, and they work perfectly.

Intake Manifold -- Computer doesn't care much about an intake manifold. -- Stock manifold is usually best choice.
Throttle Body -- Increasing the size of the Throttle Body is a waste of time and money -- UNLESS -- the CAMSHAFT is changed, as well.
If you don't change the cam, the rest of the stuff won't do diddley -- it all has to work together, or it won't work at all!
Our Grand Marquis are fine cars -- built for comfort, NOT for speed. If ya want speed, get a Mustang !!
I have restored/modified a '95 Grand Marquis -- built for long-distance, high-speed touring of the mountains and deserts of the American West.
Extensive Suspension Mods; Transmission Shift Kit; Ignition Upgrades; Dual Exhaust; Severe-Service brakes; Engine tuned to factory specs.
2000 rpms = 80 mph; Engine Temp = 194F.; Outside Air = 105 F. Fuel Pressure = 35 lbs/idle.
Fuel Mileage = 16 city, 25 Highway. Chevron 87 Octane Gasoline.
Odometer = 164,000 miles


Walker H-Pipe; MagnaFlow Glasspacks; Walker Tailpipes.
 
  #3  
Old 06-24-2019, 10:59 AM
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Join Date: Dec 2017
Posts: 9
Default

Originally Posted by 95 MERC View Post
Correct replacement fuel injectors for your 5.0 V-8 are: MOTORCRAFT CM4347.
Those injectors have a large metal body that can hold heat and cause sticking problems.
I switched to the BOSCH Series 3 -- 19-lb. injector -- Orange body. These run cooler, less chance for clogging. I have over 50,000 miles on the BOSCH injectors, and they work perfectly.

Intake Manifold -- Computer doesn't care much about an intake manifold. -- Stock manifold is usually best choice.
Throttle Body -- Increasing the size of the Throttle Body is a waste of time and money -- UNLESS -- the CAMSHAFT is changed, as well.
If you don't change the cam, the rest of the stuff won't do diddley -- it all has to work together, or it won't work at all!
Our Grand Marquis are fine cars -- built for comfort, NOT for speed. If ya want speed, get a Mustang !!
I have restored/modified a '95 Grand Marquis -- built for long-distance, high-speed touring of the mountains and deserts of the American West.
Extensive Suspension Mods; Transmission Shift Kit; Ignition Upgrades; Dual Exhaust; Severe-Service brakes; Engine tuned to factory specs.
2000 rpms = 80 mph; Engine Temp = 194F.; Outside Air = 105 F. Fuel Pressure = 35 lbs/idle.
Fuel Mileage = 16 city, 25 Highway. Chevron 87 Octane Gasoline.
Odometer = 164,000 miles


Walker H-Pipe; MagnaFlow Glasspacks; Walker Tailpipes.
But if I do change those things it's won't care much? The only reason I'm changing it is because my stock intake is pitted and needs to be changed and I was at a flea market one day and somebody have upper and lower intake for a mustang and throttle body and spacer all in great shape for about 15 dollars that's cheaper than a junkyard but j also think I may have leaking injectors so I was going to change them but the orange Bosch should work right
 
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