Final did the "wool tuft" test on a FEED hood for the FD
 

Well, my M3 decided to blow the engine forcing me to get the 7 back on the road.

I somehow passed all of the Texas inspections :) and decided it was a good time to do the wool tuft test.

In a nutshell, the vent closest to the windshield sucks in air at all speeds. The vent farthest away will suck air in at slower speed but then above 30mph air flows out. Sooo what that means for actual cooling of the engine I have no idea....

I have gauges o'plenty but the car is running so cool now, I have to drive it like I am on the track to keep the coolant temp up. It's 34 degrees in Dallas right now.

Running Evans, Fluidyne, Dual oil coolers (but the thermostat has stayed close...oil temp only getting up to 120ish).

Pics below including the obligatory car pic :)



https://www.rx7club.com/forum/attach...1&d=1200762365

Before driving
https://www.rx7club.com/forum/attach...1&d=1200762365

After driving
https://www.rx7club.com/forum/attach...1&d=1200762365

So how did the strings react above 60+ mph?

Thanks for posting though. I know tons of people will appreciate it.

Off topic, but who did you get your hood from and how is the fitment?

Beautiful car by the way!

Bob, sorry to hear about the blown motor......those damn piston engines are so fragile :D

Please post more pics of your FD! Your public demands to see the interior, wheels, brakes, back hatch :lol:

i knew it!

Not totally out of the unexpected.

Any air pressure under the hood would escape from the first vent.

The 2nd air would 'suck' in air as it is adjaced to a very high pressure zone in front of the windshield.

But very nice to see.

This should be done for 'all' vented hoods to see what is actually going on.


How the 2 vents aid/hamper cooling? who knows, I guess only measure temps would tell.

Thanks for the info! Do you have an E36 or E46 M3?

The same. The vent farthest from the windshield blew out at a fast speed. The one closet sucked in. I only got up to 80mph.

The fitment is pretty good. The hood is from Shine, a vendor on this forum.

HA! I really haven't done much to the car. I was trying to troubleshoot a gauge problem and install the computer in for the radio so I could control the PFC and run a track GPS application.


Otherwise it is still kinda ghetto and half together.

Do you really want some pics?

Yeah, I kinda suspected it too. I was hoping that it would be far enough away from the base of the windshield to not be affected....oh well.

Yea, I wish I could tell how the temps react. I suspect that not much would change in truth. The weather is so cold now that I might be able to see a difference, more so then when its hot out.

Maybe if I get a chance I will swap my stock hood on and do some runs to see.

E46...

was waiting for the R8 diesel to come out and replace the E46 with that. The new M3 with the dual clutch also seems nice.

The GTR also is a possibility too....

eh...to many choices and money....

How are the coolant temps in slow/stopped traffic with this?? Is there a noticeable difference, or have you *just* gotten it installed and not yet had a chance to get stuck??

I plan on picking one of these hoods up in the spring (waiting on my BNR's to arrive, and my fuel upgrades, and bigger wheels so I can install my brakes, and... the list goes on. It's crazy how you can order something in mid November and still be waiting for it in mid January... lol) when I have built up some spare cash, beyond my "oh shit" safety bubble.

Thanks a bunch for posting your results!!

Not that I notice but it has been cold here. Maybe in the summer or when it hits 70 degrees F here again I will let you know.

I have so many mods on the car that the engine runs pretty cold.

...and I was no where close when it happened! ;)

Sorry to hear about it.

Wtf! I thought you were gone from zee forum 4ever, Manute :lol:

Zee forum is great but it doesn't pay nearly as well as zee job :p:

Damon! Good to hear from you.

Got a call from BMW and it doesn't look to bad to fix...just going to cost my left nut :(