Egr Valve - To Delete Or Not To Delete

Nightfire said:

EGR is only good for a few increased MPG's, otherwise its useless. If the car originally had the EGR deleted than its a safe bet that the EGR port on the drivers-side header is capped. You will DEFINITELY notice if whether an EGR-delete has been tuned. If not, the car will feel like a stock Honda Civic

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Onesick99GT said:

@Loose nut You will need a tune shop to do it for you. That cost a pretty penny! I'd reconnect it if I were you unless your have lots of mods and some free money laying around to spend on a good tune. If your close to stock or have light mods, cold air intake, catback , headers its not worth paying to have it tuned.

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Onesick99GT said:

@Loose nut The amount of air being sucked in from the vacuum leak would not be enough to cause a big horsepower loss. Your talking a couple miles per gallon at best or a few horsepower at most. Without me seeing the issue I'm only shooting in the dark based off what you gave me. I would go with a ford performance intake for your mustang. All a plenum does is increase the size of the bore for example a smaller diameter hole 2 inch compared to a 4inch hole will move more air through the bigger hole. The less restriction and more air your intake system can take in and compress the bigger spark event you have which means more horsepower. A throttle body, intake and plenum will give you a small but noticeable increase in horsepower. I can't speak much about brands but know they all do practically the same thing which is increase diameter allowing more air to flow easier through-out the motor. Don't get caught up on which brand is better unless your comparing superchargers or turbocharger systems. Some intakes are designed to flow air better than others but the difference is so small that it wont be noticeable.

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Onesick99GT said:

Your 18lb injectors will do fine even with moderate upgrades. The idea is to stay below 80% duty cycle with your current injectors. When you start upping the horsepower or more air required to ignite, then bigger injectors are needed to keep up with the higher air flows. If your going to run headers, plenum and intake, cold air intake, and a bigger throttle body moving to 24lb injectors is not a bad idea. If you replace the injectors stay with ford performance only and keep the stock ignition wires. The stock ignition wires are good up to 800 hp and perform better than most aftermarket ones. That was told to me by a professional tune shop who races vehicles for a living other than making cash tuning cars on the side. The link below is a good reference point for injector sizing based on horsepower. If you did all the mods I suggested in the underlined part your looking at around 300 base horsepower NOT RWH.

http://mustangpartstech.com/FuelInjectorMath.htm
Do I have to get a tune after going from an 18 to a 24 lb injector or will it be fine?

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TrentMO said:

Hey guys I've just started on my 2000 Mustang GT after owning it for nearly a year (newborn came first) and have run into a sticky situation. The previous owner has installed long tubes and an H-pipe and capped off the EGR tube on the EGR valve itself. I can't tell from the top side if there is a spot on the headers for the tube to attach until tomorrow (my jack won't fit under the car, waiting for a friend to bring one by). From some simple searching I have come to the conclusion that you have to tune the car to compensate for an EGR delete (let me know if this is true or false, please).

Would it be easier for me to get the tubing routed to the headers or should I look into deleting the EGR? Thanks in advance.

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