ROG100

Just got back from the garage and I could not find a 1" hole saw.
Anyone lend me something?
Maybe a plasma cutting torch.
I will go and check again.
Anything to get more HP than that dam 91 GT

BC

I cut a large hole at the BACK of the airbox on the S4. I then removed the seal on the back of the firewall at the hood. Dare I say it sounded quite cool. But I don't recall alot of change in power.

GlenL

I thought Rich did the venting?

This is one of those topics that has been thoroughly gone over. I probably spent 10 hours getting materials and fabbing nice tries 1 and 2 before making the swell aluminum frame with custom neoprene straps. And it's not worth squat for more power. Would you prefer every idea is praised or is open feedback better?

ROG100

I remember sucking noises - that was before I got married.
Don't remember any extra horses though.
I guess I just got banned.

jeff jackson

My goodness...its a regular "Comedy Central" around here...har, har, har. I've learned my lesson fellows...from here on out, I'll just sit, read, and learn from all you BTDT types...that "knew better"....

mark kibort

Sorry i couldnt find the pics to show you . Yes, in the spirit of cold intake, i vented the air box to the firewall, just at the seal, and its all sealed up so that the base of the windshield area can generate pressure in the air box. this is confirmed by my Sunx pressure sensor. just for a note, after a race, the intake is cold to the touch, there is a very short transient time for the air at WOT. however, there will be a certain amount of hot air now, coming from your vents. usually, there is a 40 degree temp difference that equates to the power gained or lossed to the tone of .5psi. you can get a .5psi vacuum with a sealed air box at WOT, so the vents, may be counteracted by open holes above the hot engine headers. Hard to say!

anyway, i would try and vent those openings to the firewall. I should have shown my set up that has the over the radiator , inlet ducts, cut into the air box top sealed to the firewall through a cut and sealed opening.

as far as dyno testing, without an air box top, we have seen 6-7hp gains. I think anderson saw this as well.

Mk

heinrich

Touchy touchy Jeff .... I was completely just having fun. Many have modded airboxes and many like them modded. In the 911SC a modded airbox WILL give you horses. Come on Dude if it's hairbrained why have so many tried it ..

bd0nalds0n

FWIW, I think anyone that posts their stories on this forum accept as part of the posting that others might offer a critique, or be overtly critical of what they've done, especially the more it flies in the face of convention.

Most of these are offered (IMO) in the spirit of how peer review should operate in R&D and our education system, and (IMO) most of them never deteriorate to mean-spiritedness. Although if you're on the receiving end of such "input" it can certainly seem different than when you have no stake.

No need to pick up your toys and go home, I think everyone is meaning to play nice.

FlyingDog

I think it was Steve Pappas that determined that if the car is moving, the air temp in the tubes and air box is the same as ambient. As somebody else mentioned, I think Louis Ott determined that there is no pressure drop through the tubes and airbox.

PorKen

I've come to expect the first two pages of feedback one of my 'schemes' will be knee-jerk-ain't-gonna-work posts.

Any less, and I reckon the idea must not be very original.

FlyingDog

What's your next 'scheme', an electric supercharger?

PorKen

(keep clicking Cancel)

jeff jackson

You know...I didn't drill any holes in my air box lid...or encourage Rich to do his...my only stake, in this whole fiasco...was that I have seen this done sucessfully on other cars. Sorry I blew up. I am a grown man, and am quite capable of enduring "due" criticism. I just see a disturbing trend to level criticism quickly, and with some sarcasm thrown in for good measure. To me, thats the part that I can do without. Thats why I'll just read and learn for a while and not draw the ire of the "community"...

mark kibort

louis didnt verify that there was not a pressure drop in the air box. i posted this information 10 years ago. .25"Hg vacuum at 100mph, and after sealing the air box (as it was really designed to be) vacuum raised to .5"Hg vacuum.
The original eRAM neutralized the vacuum and created .5psi pressure.

10 years later, ive verfied it again, and also measured ram pressure . for our uses, its about .1psi at 110mph. then, go full throttle, and it drops to about .3psi. (and this is only with a vented air box!)

Did simlar tests with the BMW air box and found similar results, but much more vacuum. (on the throttle body of the filter).

one emperical test we did a the track, is touching the intake in the hot pits.
it was cool to the touch. after a few mins, it became VERY warm.

mk

Jim_H

I think more often than not that sarcasm is actually an attempt at humor. I have a gift for throwing in a smart ***, "funny' remark at exactly the wrong time, it's a curse. Reading through this thread some guys were screwing around, having fun. I kind of view the 'list as a guys locker room, shoot'n the **** and giving each other a hard time when the time is right, or not. As for drawing the ire of the community, I gaurantee the same guys who were diss'n you today would be jumping in helping you with whatever problem you might have tomorrow.