Just curious as to how you would know this? I have figured that with a SIGNIFICANT amount of air being held off at the front of the car due to the front mount ic that it would make MORE sense to leave the stock undertray off. The only thing that I could see better than this would be a custom undertray which isn't exactly easy to do for a lot of people, I have no resources for this... now if somebody was to make one for my set-up then that would be "Optimal". And have a vented hood as well.

You know, not everything on the car has to be perfect if it is already running very fine. IMO

 

It's crossed my mind about the ducting issues (not the undertray) at speed. If the new 99 spec front bumper with it's larger radiator and I would guess similar ducting as our cars (undertray openings, foam around the radiator), then there is a finite amount of air that can pass through the radiator. The reason for the front air damn redesign was because of this. There was too much air going into the mouth and not going through it fast enough when at speed that it was spilling back out the front of the mouth and under the car causing turbulence. They redesigned it to channel the air around and to the side with a little of the canard effect on the sides.

Comments?

Tim

 

like the way I slipped the wrong spelling of dam in there

Tim

 

I have the Blitz FMIC installed with the stock radiator and removed AC Condenser. I noticed a large difference in average temps cruising and running it hard. I was so excited to show the local car guys my intercooler that i didnt bolt the undertray on. My fans were never off!!!! I was always idling at 96-100C put the undertray on and total difference. 85-93C average temps. The undertray is a necessity for cars like mine.

 

Interesting find:

Today I re-installed my 99-lip and left the undertray off.

The water temps shot up to 105-110C!!!

Then I installed the undertray with the 99-lip and temps dropped to 85C.

With no undertray and 99-lip there wasn't that much difference in temps. It would hover around in the mid to high 80's.