Air box modification - Printable Version
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Air box modification - Kaj Hallstrom - 06-26-2017
I am considering doing the small air flow upgrade on the air box. Basically drilling the 4 large holes in the front air box. It was recommended to insert rings in the holes for better flow. Why is it better with the rings and where do I find them?
I installed a K&N filter in my old 944 but didn't notice any difference. Is it really worth the money?
Air box modification - Chris Vais - 06-26-2017
I used audio speaker ports that you can easily find online. The smooth curved surfaces contribute promote undisturbed airflow whereas a simple drilled whole results in a disrupted air flow. If you do this mod, remove the snorkel as well. You'll notice the power difference and the induction howl is a nice added feature.
Air box modification - az968 - 06-26-2017
I used intake horns from a Suzuki, per Matt's mod to the mod.
Looks more cool.
Air box modification - flash - 06-27-2017
the K&N is responsible for a little less than half of the 11.8 hp increase i saw when i did the airbox mod dyno testing.
it is important to make sure you do not overoil the filter
Air box modification - az968 - 06-27-2017
I meant velocity stacks. Maybe a little more power than the rings but no data to verify. Yes, over oiling the filter screws up the MAF.
Air box modification - Kaj Hallstrom - 06-27-2017
It's a done deal. Worked all day on this and finally came up with a solution. Two large holes on each side capped with a seat ( the one used in office tables to guide the wire down to the computer) to make a smooth airflow. Snorkel still in, will play with that. When it is time for a filter change I will take my chances on a K&N.
Air box modification - Kim - 06-28-2017
I am quite sure that this modification works best with the snorkel removed.
Air box modification - 94SilverCab - 06-28-2017
Correct, the snorkel should be removed.
Now you are ready for a chip
Slippery slope, here you come...
Jay
Air box modification - MCL968 - 06-28-2017
I did the chip, exhaust, and the air box mod. Done for now. Next is suspension and brakes. Car is a lot more fun to drive, but the increase in power, however slight, makes the weaknesses of a twenty-five-year-old suspension glaringly obvious.
Air box modification - Kaj Hallstrom - 06-28-2017
Ok Guys, snorkel coming out. Any tricks in removing it?
Air box modification - Kim - 06-28-2017
I think that it simply pops out. I don't recall that it is bolted in anywhere. Lift the hood, give it a little tug and you will see what is keeping it in place.
Air box modification - Kaj Hallstrom - 06-29-2017
Thanks everyone for your inputs. Snorkel is out. I can feel the difference. Next step is to install K&N filter.
Air box modification - 94SilverCab - 06-29-2017
and then M030 sway bars, hemispherical drop links, change out coils and shocks, strut brace, under carriage brace, 944 turbo caster blocks...S/S brake lines, proportioning valve, cast drilled rotors, big reds, short shift kit...yada yada yada....
LOL,
Jay
Air box modification - Kaj Hallstrom - 06-29-2017
That's all Jay?
Air box modification - 94SilverCab - 06-29-2017
Oh no, the yada, yada, yada is worth $10k at least
Jay
Air box modification - MCL968 - 06-29-2017
Jay forgot the audio enhancements and covering every surface with Dynamat before adding the new speakers, amps, and Nav unit.
Seriously though, I found the lower suspension brace and strut tower brace made a big difference, and the chassis brace (roll bar) also dramatically altered the characteristics of the car. The short shifter is cool, but I never had a big issue with the shifter anyway. More importantly make sure the lower nylon pivot and the bushings are good. I discovered that was the real problem with my stock shifter when I installed the D1R short shifter.
And changing to 17's was also a good move, but Kaj's car has that covered, so the next thing is the RS Barn chip and maybe an exhaust upgrade. Flash has a post in here on how to do the exhaust in a more affordable manner. Might be worth taking a look at, the exhaust is a very simple system.
Air box modification - 94SilverCab - 06-29-2017
May as well do the header if you're buying the cat back. The header adds real torque and horsepower
Jay
Air box modification - sstman - 06-30-2017
What can you do to the headers?, I've done the chip,airbox, struts, brake lines, disc & pads....etc etc...?
Air box modification - 94SilverCab - 06-30-2017
Header is not a modification, it is a replacement from a well known secondary supplier...
Jay
Air box modification - ds968 - 06-30-2017
I've read ( somewhere on this forum, I think ) that ceramic coating of the headers can also improve HP a little ?