open air box

SentraSE00 · May 15th, 2003, 08:05 AM

can sombody tell me whether it is really that bad to drive w/ an open air box. Someone is telling me that its killing my car but i have the air filter in a position that it is filtering most of it out

toolapcfan · May 15th, 2003, 08:15 AM

It can't hurt your car, your filter might get dirty faster but that's it.

lowmileage · May 15th, 2003, 09:49 AM

It's probably pulling in more hot air than it did when the air box was fully intact

Cold air helps

performance, warm air doesn't

zeno · May 15th, 2003, 12:06 PM

This is called the ghetto airbox trick. It isn't horrible but it is doing next to nothing (maybe 1hp). Save up for a real intake or buy a used one.

luminus · May 15th, 2003, 06:00 PM

I was playing around with this when my car was on the dyno a while back. Lost several HP below 4k or so, and gained about the same amount over 4k.

Best thing to do for performance intakes is to buy/build a cold air intake. The length of the tube is what counts, not the cold air.

ak

SergioCR · Jun 6th, 2003, 11:26 PM

Quote:

Originally posted by luminus
I was playing around with this when my car was on the dyno a while back. Lost several HP below 4k or so, and gained about the same amount over 4k.

Best thing to do for performance intakes is to buy/build a cold air intake. The length of the tube is what counts, not the cold air.

ak

Jmm... so... what should be the right length of the tube? isn't it the same air that gets into the tube as long as the diameter is the same?

91SR20DE · Jun 7th, 2003, 05:31 PM

well, actually its both, kinda, AEM did alot of R&D to get the gains you get from they're CAI. If length was all it took, the Hot Shot would make the same gains, when you look at them both, they're pretty close in design, but the AEM puts 8WHP while the Hot Shot does around 5-6....Grasshoppa....

mpg9999 · Jun 7th, 2003, 06:26 PM

It is both the design of the CAI and the fact that its colder air. Colder air is denser. By playing around with the length/diameter of piping, you create a rarefraction wave at certain rpms to provide I nice bump in power.

sr20dem0n · Jun 7th, 2003, 07:35 PM

Quote:

Originally posted by 91SR20DE
well, actually its both, kinda, AEM did alot of R&D to get the gains you get from they're CAI. If length was all it took, the Hot Shot would make the same gains, when you look at them both, they're pretty close in design, but the AEM puts 8WHP while the Hot Shot does around 5-6....Grasshoppa....

Dyno's and power gains vary from car to car, you can't just say that one makes 3whp more than the other just from 1 dyno of each. Maybe it was humid for the hotshot dyno, maybe the car was really hot, maybe the before and after dyno's were done on different days, maybe the stock air filter on the spec they put the aem on was pretty dirty and plugged up, so it showed the aem as giving more power.

Jun 8th, 2003, 11:21 PM

Why is a longer tube so beneficial when it comes to the intake?Is it just where the filter sits?

Mecho1.6 · Jun 15th, 2003, 02:23 AM

i built my cold air, i used dryer ducting for the tub and put the filter down were the fog lamps are saposta be, i noticed a good differance at acceleration after 3500 rpm, and it makes a grate wine nose at high rpms. it only cost me $40 all together.

Katana200sx · Jun 15th, 2003, 02:28 AM

people have done that before and when i first started i thought of doing it as well. the only problem is that under accelleration the tube could cave in on itself

Mecho1.6 · Jun 15th, 2003, 03:16 AM

no the dryer ducting is laced with a spring so it wont cave in.

SergioCR · Jun 15th, 2003, 09:55 AM

Quote:

Originally posted by Mecho1.6
i built my cold air, i used dryer ducting for the tub and put the filter down were the fog lamps are saposta be, i noticed a good differance at acceleration after 3500 rpm, and it makes a grate wine nose at high rpms. it only cost me $40 all together.

What did you do with the MAF ? isn't it restrictive as well?

Katana200sx · Jun 15th, 2003, 10:32 AM

oh..good idea mecho