future

That they did all be it for street application

To add I’m sure a few of you have unfortunately experienced tearing of your rear bumper PU around the exhaust holes ... this is mainly due to removing your under tray and not heat from the tips as many think! (although larger tips can add to the problem)

When the under tray is removed the rear bumper acts as a big "air trap" not only creating the drag and lift associated at high speeds unsettling the back end, but the air resistance build-up at the lower edge of your PU flexes and vibrates resulting in the above

Edited to make clear: The only other support the rear bumper has along the rear edge are 2 thin drop down supports which in most cases are loose and will easily flex when pushing lightly with 1 finger so just imagine what the fast moving air is doing (I'm not refering to the 2 either side).

Hot air rises so the benefits of running without are pretty much negligent. The only reason the Cup cars ran without was for ease of access as a trade off and no other reason.

Even though heat is the biggest killer for engine ... rapid cooling is even worse and ESPECIALLY for turbo cars which should always be left to run at idle for a few mins after a spirited/track run.

MarkD

huh?

wait, do I really wanna know?

malan1

Like I mentioned....I need one, so who's offering?

FisterD

Yes. I don't think I have a box it will fit in though. I wonder if I can just stick a tag on it? Email me at fdmotorsports@comcast.net

malan1

FisterD, Ill send a pick-up tag if you have another. Might be a good time to order your exhaust anyway. PM me.

Quadcammer

care to explain how you think ANYTHING engine related is cooling rapidly? Have you ever stood near the back of a 911 thats just been shut off? Cool is hardly the term for it.

As for turbos...those few minutes at idle are used to cool the turbos, not keep them warm.

This part of your post makes no sense.

I'd also like to know how you know why Porsche left the tray off for cup cars. Have you talked to the engineers on this?

H.H.Chinn

So does replacing the engine tray increase lap times and prevents the rear bumper from distorting because it is filling up with air at highway speeds? I better go look to see what my dogs might have done with mine.

JPP

Everyone's an Engineer ..... except of course, the Engineers ...

Mike J

Actually, I AM an registered professional engineer.

JPP

Me too (and obviously not an English teacher). So you and I get one vote ^^^

matt777

I haven't yet participated in an engine tray debate but here is my chance and I haven't spoken to any engineers about this although I am one of sorts. I thought the tray was put on to keep noise levels down? Just another thought...with the low slung engine doesn't it get constantly drenched in very wet conditions? This can't be any good for it.

CalvinC4S

Very true

993MAN

At least an engine tray will stop that embarrassing moment when you leave someone's house and there BRAND NEW CONCRETE driveway!

Paul902

" I used to want to be an engineer, now I are one".

Quadcammer

water hitting the engine evaporates almost immediately at operating temps.

Plus, everythings pretty well sealed up under there.

My turbos are right behind the tires with no protection whatsoever, and they haven't been affected in any noticeable manner. Little dirty maybe.