Anyone else done any dremel work?
Should be a good topic for discussion.

<img src="graemlins/burnout.gif" border="0" alt="[burnout]" />

 

Bad points:
Drawing in hotter under hood air
You loose the benefit of drawing air from the high pressure area that the stock air intakes are located at. (I know it's not dramaticly much, but it is a high pressure area.)

Good points:
It would probably reduce a problem with turbulence that I suspect occurs with the stock airbox top.
Weight reduction.

I remember you doing some intake air temperature measurements. It might be interesting to see if the modified airbox top causes higher temperatures at the filter.

 

Yup, already had the temp guages under there. Negligable effects really. Just like the stock airbox at idle the air in there heats up but as soon as you move or blip the throttle the engine sucks that intitial big gulp of hot air and it cools down from that point. Cruising around on the freeway at a steady speed the temp difference between stock and dremeled were a non player i think.

Heck, i can always tape it back up. I know Mark A has done some similar things to his (after some dyno runs), as has Mark K...diference being they have the room to vent to the base of the windshield via a notch in the sheetmetal under the rain pan. I saw a really trick set up on a race car at DEVEK day (Button willow). 1x16slot..vented to the base of the windshield..he had actually cut metal away from under the hood to make the intake fit. VERY CLEAN!! Hood closed flush. Didnt have the camera but got it on video.

I remember Louie talking about putting some deflecter in there to better redirect the airflow into the MAF. Heck, thought i may as well let it suck air driectly from above!

I have plenty of duct tape


<img src="graemlins/beerchug.gif" border="0" alt="[cheers]" />

 

You know, on Volkswagen Golfs and Jettas, it has been noted that giving the airbox religion [Making it holey.....] adds a significant amount of power. The late models do not show this effect however...they benefit more from a K&N intake and a cold air setup.

I did this last on my last car, a Corrado. I bought a K&N and then went to Home Depot...$5 worth of PVC pipe allowed me to put the filter down in the bumper area, where it got great cool air [yeah, 90 degree humid Orlando air, that is...] but this indeed made a noticeable difference. I just know this FWD hatchback VW would kill 5.0 Mustangs.

I suspect that Porsche's design for cold air intake on the 928 is not too efficient. The later cars [S4 and up] with knock sensors would most likely greatly benefit from some sort of cowl induction or properly set up cold air system. I've toyed with the idea of running some tubes from the entrances of the existing air intakes to down in front of the radiator on my non-knock sensored '85 S2.

Normy!
'85 S2 5 speed

 

The deflector that Louie discussed is basicly a bellmouth that fits over the opening in the base of the stock airbox. The edge of the hole in the stock airbox has a small radius on it, which is bad for airflow. Putting a larger radius on the opening increases the airflow potential, even though the actual size of the hole hasn't changed. Ideally the radius at the edge of the entrance should be at least 1/2 the diameter of the hole, and curve around at least 120 degrees. You can't make the bellmouth that big because of the space limitations, but the bellmouth than can be fit in there is enough to make a difference. The holes in the top of the airbox wouldn't have any effect on any of that, but should help with another separate air flow problem in the top of the airbox.

Those new holes sure look like a great excuse to get out the Road Dyno.

 

Back in March I took the "new" track car to the dyno. It's a 5.0 with a EuroS top (heads,cams,intake). Dave Lloyd had a cut air box top that I used (this was right after Mark Andersons post). Results on the dyno- no change in HP/TQ or the curve.
As always-YMMV

 

Hey Tony -I did the same thing - only I made it round, and did not think of the places to not cut for the straps

Anyway, i noticed a nice increase in...noise from the intake - I like that personally.

I CAN tell a difference in traffic when hot - it will actually take a half a second to get the cool air, and you will feel the small ramp in power. I may tape it up next summer, but it IS San Diego, so it doesn't get hot until I get to ALPINE.

 

Brendan ironically it seems pretty hot here in El Cajon too My 944 was rising up to 3 quarters on the way to school a couple days outta the week before i got that lower temp fan switch. Hmmm i think i should do the same for the 928

<img src="graemlins/burnout.gif" border="0" alt="[burnout]" />

 

Damn if I don't have a nice radiator coolant sensor for the S4, but haven't put it in yet.
I think its time for a coolant switch anyway - its getting up the third line in an 89 too often. 'COurse, doing 75 -110 to Alpine, going from 4th redline to fifth repeatedly probably causes that.

Is your 928 red? I haven't seen it at all.

 

Tony,

I can't believe you set the filter housing and that ratchet on your paint!!!

Other than that, keep up the good work!

Randy
'93

 

Well, an hour or so before that picture was taken i had a appx 3ft square cardboard box fly out of an on coming pick up truck! Just as i uttered the words "ah F%$"!! it hit the hood of my car, the winshield and over the roof and on to the side of the road. I thought for sure the hood was going to be dented. It wasnt, just a few scratches that will buff out. Roads in vegas are great, just have to watch out for debris and some of the idiots that transport stuff around town!
I just never got my fender covers out, Ill be a good boy next time!

 

Tony,

I am glad that nothing was hurt in your hitting run. About a year ago, I was driving home from work in my Accord when all of a sudden a large yellow object (maybe Ms. or Mr. Pacman...) came out of nowhere. I hit it squarely and it just exploded.

One minute, I am minding my own business. The next thing I know is that it looks like it is snowing and when I hit the object it just made a "whump" sound, with no damage what-so-ever. It turned out that the object was a yellow velour bean-bag chair filled with a billion of those little foam *****.

I can still find those little foam ***** lodged in the inner workings of my engine compartment.

Rob <img src="graemlins/roflmao.gif" border="0" alt="[hiha]" />

 

Re Flying Objects. I'm in left of 4 lanes of I-80 in Patterson, NJ. Car in front of me kicks up a spade with no handle; it becomes airborn and sails directly toward my windshield, but then rises over car and falls to pavment behind me w/o hitting anyone, but now it is in middle lane of traffic. I had to put my eyes back in my head and resume looking forward so I don't know where it went next. Someone was watching over me at that moment. <img src="graemlins/r.gif" border="0" alt="[king]" />

 

Have to change the topic to hit and run by UFO's.
Driving to town for my birthday dinner in the Cobra and guy in fast lane loses something out of his work truck which richochets of the truck behind him and right into the front quarter panel of my car. Talk about instant driving room, everybody between me and the work truck (cable TV truck) gave me all the room I needed to get behind the cable dude and follow him to his work site. I was ready to slay him right then and there but for the wife and youngin'. His boss was nice and paid to fix all damages plus pain and suffering. Found out that his worker had failed to latch the top of a shop vac down and that is what hit my car.