EGR questions, 92 GT

Green 94 5.0 · May 29, 2011

So both VibrantRedGT and I coming from 94 GT's ran into a few things that were very different for us when disassembing the intake on the 92 GT we just picked up. The first was the EGR plate which had coolant running through it. My 94 definitely didnt have it and I have no clue whether its necessary or not. Next, I'm looking at a 70mm throttle body and deleting the EGR entirely. Does anyone have any input on an EGR blockoff plate? Long time mustang guy here, but new to the differences between the Fox and SN95, and just want to make sure this gets done right the first time. Thanks.

HISSIN50 · May 29, 2011

We should note that this sounds like it's going to be a weekend toy (correct me if I'm wrong)...............

In theory, setting a hard EGR fault will shut off the EGR function. If you're going to tune it, it won't matter after you turn off the EGR function anyhow.

If there's no EGR function, the coolant is moot (the coolant is for cooling purposes - the EGR gasses are hot).

So it kinda depends what will be done with the EGR function. In general, you will not be in uncharted territory.

VibrantRedGT · May 29, 2011

The coolant issue we ran into was basically the EGR spacer which is pretty much the question here. Why is there a coolant line going through the intake EGR spacer? Since it looked line there had been an overheat issue at some point so we decided to take the heads off too. Didn't think we would go this far but while we were gking why not.

jrichker · May 29, 2011

The purpose of the coolant is to warm the throttle area in winter to prevent icing of the throttle. The pressure drop across the partially closed throttle causes a drop in temperature. During cold and wet weather, ice can form on the throttle, causing poor throttle response and stalling.

Many carb cars have a heat diverter on the air cleaner that does the same thing.

Don't believe it? check out a single engine piston aircraft. You'll find a carb heat control along with a mixture and throttle control.

Green 94 5.0 · May 29, 2011

HISSIN50 said:
We should note that this sounds like it's going to be a weekend toy (correct me if I'm wrong)...............

In theory, setting a hard EGR fault will shut off the EGR function. If you're going to tune it, it won't matter after you turn off the EGR function anyhow.

If there's no EGR function, the coolant is moot (the coolant is for cooling purposes - the EGR gasses are hot).

So it kinda depends what will be done with the EGR function. In general, you will not be in uncharted territory.

No need for it, and it will be deleted along with the heater hoses. Just wanted to make sure the coolant lines through the spacer was not a necessary thing before we deleted it.

Green 94 5.0 · May 29, 2011

jrichker said:
The purpose of the coolant is to warm the throttle area in winter to prevent icing of the throttle. The pressure drop across the partially closed throttle causes a drop in temperature. During cold and wet weather, ice can form on the throttle, causing poor throttle response and stalling.

Many carb cars have a heat diverter on the air cleaner that does the same thing.

Don't believe it? check out a single engine piston aircraft. You'll find a carb heat control along with a mixture and throttle control.

Well that definitely wont be necessary considering our coldest dead of winter temperature is in the 40's and that will oly be for a day at a time as it bounces from 70 - 40. Looks like that will be deleted altogether.

VibrantRedGT · May 29, 2011

We would never use heat plus it's not a daily driver anyway. Couple of things on the FOX body that differ other than exterior vs our 94's. We couldn't even get the EGR spacer off the stock intake due to the rust.

jrichker · May 29, 2011

Green 94 5.0 said:
Well that definitely wont be necessary considering our coldest dead of winter temperature is in the 40's and that will oly be for a day at a time as it bounces from 70 - 40. Looks like that will be deleted altogether.

Your single engine airplane just crashed....BANG!!!!

I think you may have missed something - "The pressure drop across the partially closed throttle causes a drop in temperature."

It's the same principal that makes your A/C or refrigerator work, and that temperature drop can be between 20-40 degrees. If it's 60 degrees outside and you get a 30 degree drop, that's 30 degrees in the throttle body. That's cold enough to freeze the moisture in the air as it comes across the throttle body. Chug Chug goes your Mustang as an obnoxious little four banger Honda beats you off the line....

HISSIN50 · May 29, 2011

Joe, if the lines are for icing, why are there no coolant lines on the Fox Cobras or the SN95's (which happen to use different EGR components)?

olbob · May 29, 2011

Nice information Jrichker!!!
Olbob

jrichker · May 30, 2011

HISSIN50 said:
Joe, if the lines are for icing, why are there no coolant lines on the Fox Cobras or the SN95's (which happen to use different EGR components)?

There are obivious visible differences, and there must be some hidden engineering differences too. These differences could reduce the possiblity of part throttle icing to a level that Ford found acceptable.

Still scratching your head? See http://www.google.com/search?q=heat...-us&ie=UTF-8&oe=UTF-8&startIndex=&startPage=1 for an afternoon of browsing ythe Internet...

VibrantRedGT · May 30, 2011

Hissin, exactly our thoughts on this. After 1993 this setup magically disappeared. It will all go back on accordingly but confused a bit. I do understand it all now. We're SN95 guys who haven't seen a few things that are on the FOX platform before. It's pretty cool though and we're excited about the 92GT.

*We have the 92GT build thread with tons of pictures in the 94-95 Talk section. Currently after 36 hours of getting the car it's stripped down to the block and parts prep is going on now (Alum. Heads, Intake, etc.).

HISSIN50 · May 30, 2011

Joe (R), I'm sorry I was not clear. I was looking for Mustang-Model specific documentation from Ford about the de-icing theory.

Joe (Vibe), glad to hear it's going so well. I've kept tabs on your thrash thread.

Mustang5L5 · May 30, 2011

I'm not so sure I'm convinced the reason for the coolant lines is de-icing. I understand the principles of how it would help, but have yet to see any other oems use coolant lines as de icing in any other oem applications.

It may help with that on the side, but I believe the primary purpose is egr-cooling.

Why was it removed from the 1993 cobra though? No idea. I don't think ford though 93 cobra owners would only drive their car in warmer drier air when icing is not possible. Technical changes? Not sure without testing. Funny though that the gt-40 intake does use an egr coolant spacer, while the cobra did not. Then again, it could be some silly reason such as they couldn't get the cast version to bolt up correctly with an egr spacer and had to make it 1-peice...who knows

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