Thanks! I appreciate the compliments. The tray is attached to the dam bracing only, and not separately to the car. I could test no dam vs dam alone vs dam plus tray, but not tray alone.

Another placebo effect I forget to mention was the perceived faster warmup times.:) No, sorry, I am pretty much un-instrumented when it comes to serious temperature readings. I don't know if it would lead to faster warmup or not. Most of the stock openings are still open, and have a couple of inches of clearance between them and the tray. I would not expect a faster warmup, at least not with the amount of grille opening I still have.

Is a grill block next? That's very easy. I run one year around with no overheating problems although Hondas seem to be a little touchy in that area.

Hondas are touchy about overheating? I haven't heard anything about it!

Well I guess I miss spoke. But it seems that most that had a honda on the site when they put the grill block on complained about it overheating.

Grille Block?
 

I was going to ask about that. Is it better to block the lower or the upper? My upper is already blocked. I'd be afraid to block both, but might be able to get away with it.

Really? How odd. I know that my radiator is quite too big for my engine, *shrug*

I've blocked both. Initially just make it so that you can easily remove it if the car overheats. Or you can cut a few 4X4 holes in it till you get it where you want it. If you use the search feature at the top of the page and type in Grill Block you can look at what other folks have done.

Wow. Nice work!

I'm happy to read someone who understands this issue and refrains from proclamations of success based on them alone.

That said, I also noticed my car is quieter inside with the undertray, as did krousdb when he did his Del Sol.

After only seeing around a 2% improvement with my full undertray, I'm also kind of itching to do an A-B-A with a large and a medium-sized air dam, something which will give the nose of my car more of a NASCAR profile.

Impressed.

Bill -

Thank you for all the work doing the pictures. Just the right size and detail. I'm a wing-nut fan myself, so I like that detail. And the Vortex Generators too!!!!

CarloSW2

Look's nice. On the grill block, one thing I found on my 89 Honda was that I was able to block the airflow almost to effectively. I also found that it seems to work much better with my 4*4 opening on the side of the radiator where the fan is. I had an opening on the other side and it didn't seem to help very much. I highly recommend it, just monitor the engine temperature and open it up if you have any doubts. A cooler engine beats a cooked engine, any day IMO.