Modded Airbox Logs

I have a standard Airbox and a modded airbox, for a while I've been wanting to do a back to back test and yesterday I had to pop the standard airbox in.

The standard airbox is, err, standard. The paper filter in it should be fairly new - the standard box goes on when the car is serviced and while the filter isn't spotless it should've been changed last time. I didn't push the 80mm feed into the hole, but sat it in front.

The modded airbox has a larger air feed hole, it's smoothed, a green panel filter and I've de-screened the MAF.

For this test, the DBM, 80mm feed, battery bracket etc all stayed the same. To be clear, I swapped out the whole airbox and MAF, so these tests are on different MAFs.

The standard test was last night, 17:00pm, 21*C, on Optimax, the modded tests were this morning 8:30am, 17* (first run on Optimax, 2&3 on 95). Same settings though B6, T4 (I think). On the 3rd modded run, I didn't really get on it and then had to back off.




(Cheers Marts)

If I get really, REALLY bored I might try combinations of green panel/standard airbox and swap the MAFs etc.

I mentioned the different MAFs for exactly that reason - trying to be scientific and it's a potential reason for the difference. The difference is quite large though

Peak MAF on the standard runs is about 185-187, modded is 207-210. Standard is perhaps a little low for a Revo Stage 1 LCR?

Confirms what I've felt before though - the car is much more eager to jump forward when you boot it.

I did mine with a stanley knife - run it along the bottom of each "rib" a couple of times then grab the ribs with pliers and snap them off. On the top of the airbox, I only took the crossways ribs out - I left the ones that run parallel to the airflow in.

On the airbox inlet, I just pulled the rubber seal off, and I did file the opening out a little, but the airfeed is actually a little loose in the hole.

Still not sure de-screening the maf is worth it the risk, if you knacker the MAF it's going to cost & there's some potential for the car to run lean, but I had a "free" spare...