plokivos

iTrader: (3)

if you take the filter out of your stock box at the drag strip, you'll actually will go slower than leaving a clean filter in the airbox.

also, you'll dyno higher with the filter in.

just thought I'd let you know.

It's got to be clean filter though.

Thoe99

iTrader: (25)

Is that more due to the ECU pulling timing or what not, cuz the air/fuel ratios are off?

Jakeg97

iTrader: (56)

thats my guess

evo81

iTrader: (30)

thanks for the tip plokivos

plokivos

iTrader: (3)

i've gained 10whp with the filter in and took off 2 tenth of a second at the track with the filter in.

evo81

iTrader: (30)

classic

shimla

iTrader: (7)

would it hurt the engine/ filter if i take the cover off the filter from time to time just to hear the BOV ?

Evo_doer

Try it.

evolution mr'd

one must not forget about dust and dirt!

AlwaysinBoost

iTrader: (17)

I'm not disagreeing with you but I just don't belive in using dynos to accuratley measure HP cause they're to easy to munipuliate. And the ET part of the 1/4 mile would be the driver, so I'll ask what happened to your MPH on that run in the 1/8th and at the big end???

So far with the stock filter and no airbox cover I've trapped 104 and I'm 100% stock with the exception of a MBC set at 19psi. today I was going to try running no filter with just a nylon stocking to stop small debris and see how that goes. I usually run around with top of the air box off to hear the BOV better and I noticed a little quicker spool like that. I think with no filter at all you will see an even better spool but I don't know how the MAF will react to the air not being as straight as with the filter.

DynoFlash

iTrader: (91)

On my 667 whp evo - taking off the filter makes a ZERO whp difference - I tested it

plokivos

iTrader: (3)

yeh, i have 2 mods, and it bogs or something if i take the filter out.

sounds cool, but that's about it.

AlwaysinBoost

iTrader: (17)

your car is MUCH different then a normal evo, I wouldn't say thats a good example.

I just got back from doing some testing of my own. I took out my factory air filter which was just changed 4,000 miles ago at the dealer (15k service) and used a nylon stocking my gf had laying around. Since it wouldn't fit over the air filter opening I put it over the scoop going into the top cover.

Instantly I could tell a big difference... spool up was much faster almost instant and throttle response was almost like an all motor engine. I'd be in vacuum @ 2,700 rpm, go WOT and by 3k I was seeing over 1.2 bar... anytime I pressed the gas above 3k I was flung back in my seat and it just pulled hard.

The only other thing I noticed was the turbo wouldn't spin down as fast... usually when I let off the gas the car would decel faster then it was doing with no filter.

I wouldn't drive around all the time like this however, i've seen some things stuck in my stock filter that would rip a hole threw the nylon sock with ease. I'm going to see if this makes any difference where it counts, at the track.

EvolvedDSM

iTrader: (3)

Are you using the stock airbox?

NOVA EVO

IIRC, you are running speed-density...no MAF...different from a regular Evo setup...