<<I have made two small plates that will cover the holes .Will stick it with silicone and can be removed and replaced as many times as you want!>>

How about 4 pieces of Velcro tape? I have never wanted to cover the holes in mine though - I love the sound.

 

</font><blockquote><font size="1" face="Verdana,Tahoma,Helvetica">quote:</font><hr /><font size="2" face="Verdana,Tahoma,Helvetica">Originally posted by nota_troll:
<strong>Thanks. Makes this simple mod a little less simple.</strong></font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Helvetica">Remember I said I change things around on a whim? I had another whim this last weekend. I was thinking about your “a little less simple” comment. Actually, it really can’t get much simpler. While I haven’t felt the need to do it, you could either hose out the clutch hose filter, or put a $3 new one on each time you change the air filter. Take a look at the picture I referenced above. You can see the filter over the clutch hose secured with a clamp. It’s pretty easy to take this off and either clean or replace.

But this got me thinking about the clutch dust going into the air filter. I was also thinking about the topic of opening up the air box, via drilling, removing the snorkel, or leaving the cover off all together. So, on a whim, I pulled the clutch hose out of the air box cover (remember I am currently running with the cover in place, but with the snorkel removed) and clamped the small filter on it. I pushed the clutch hose over to the right side of the air box cover. As far as I can tell, this new mod does the following:

1) Keeps the clutch dust from dirtying up the air filter and possibly getting into the engine
2) Allows a little more sound out
3) Allows a little more air in
4) Since the air coming out of the clutch hose is probably warmer than ambient, it allows more cold air in

According to my computer analysis, dyno testing, seat of the pants, elaborate methodology, this colder air yields a horse power increase of around .0000314159 HP. Of course, a few grams of weight have been added (the clamp and filter), so it’s probably a wash. However, I have not driven the car since I made this mod, so I can’t tell you if I can feel the .0000314159 HP increase or not.

I told you it was a whim.

Tom
’95 993

 

Will a boxed cut-out of the area commonly drilled, make a difference in sound? Is it necessary for it to be holes to make sound?

 

There is nothing special about the holes, a cutout like you describe should work fine for the sound. The only consideration is that a bunch of small holes might let less water find its way to the filter in a heavy rain than a cutout, but I haven't heard anyone report that as a problem with cutaway airbox covers..

Chip

 

In fact, the Fabspeed 993 carbon-fiber look airbox cover has a single large cutout and works just fine. You can probably replicate this for a lot less than the $175 they charge, albeit without the carbon fiber look. A friend bought me one last Christmas, and it sounds great! I see some slight signs of water dripping into the housing after washing the car, but nothing serious.

Paul

 

I have to routinely swap back and forth between my stock airbox cover and the Fabspeed (can't run the Fabspeed in A-Stock Solo II). I find that in "normal" driving (i.e., low throttle input), there is no difference in sound, but under full throttle (no, wait, THAT's "normal" in the p-car!) the cut airbox howls in an intoxicating manner, especially above 5500 rpm. Don't know about others, but the Fabspeed has a notable resonance around 6000 rpm. For reference, my exhaust is stock, so I may hear more intake noise than with a modified exhaust. Got to get those RSR's this winter!!

Paul