SC lid vs NA lid... event: Aerodynamics

[aaron7]

Ok, I have a quandry here...

So, I have the NA lid right now. It has two vent holes, one on each side. I have a SC lid to put on, which has one large vent hole on one side.

Now. I've been told that the air goes under the car, thru the engine bay, and out the two holes... creating (probably the wrong word) downforce.

Does the SC lid have the same amount of flow with the one hole?

Will I be losing anything by putting it on?


Gotta love the pink widebody AW11

[MR2Di4]

Dude, I hate to say this, but until you start getting up to the speed limiter on your MK1 any "aerodynamic" stuff is just plain drag regardless of what lid is on the back.

The vent holes in the lid are designed for one purpose, ventilation of engine heat. That is why there is a scoop on the right side to draw cool air in. SC cars have their lids designed to accomodate the increased height of the intercooler unit and have air drawn through it to cool the incoming air charge.



To be honest with you I found that my stock MR2 felt faster after I recovered it from being stolen and having it's rear wing (and other pieces) removed. Didn't look as good but I could wind it all the way up to 130 and it felt perfectly stable.



I guess the short answer to your question is that it shouldn't make any difference one way or another. Something else to note is that the NA lid has that have metal shrouds underneath to route water away from the vital engine bay parts while still allowing ventilation. The SC one is just a straight grille that would allow water to just fall straight in on top of your block. Even with the plate between the valve covers on top of the engine water can get in the spark plug trench and cause problems.

[aaron7]

Many people on here have felt an aerodynamic difference without the spoiler. It helps create the pocket of air behind the back window that pushes the car down.

The SC lid vent is above the battery and tranny, not the engine. Least not in my car.

What's a speed limiter?

[locivar]

does this mean you found a way to put on the s/c lid or is this an old post that was pushed up?

[aaron7]

...no, this post is new.

And yes, I found a way to do it WITHOUT modifiying the car itself.