Thread: CAI vs WAI: Myth?

Welcome to the club .

Well if your running draw through having outside fender air might be a little problematic just because of pipe length restrictions.

I would say give at least 12" between fender and MAF, then you need 18" between MAF and turbo. So basically if you send the piping up from turbo to the engine bay, have MAF MAF behind the battery, then twist around down to the fender like a cold air intake. Good luck fitting more then one pipe though

Good call on the compressor efficiency and heat. I honestly didn't think of it that way, I was still under the impression that it wouldn't matter because intercooler cools down the air. As I'm learning about the whole T25 vs T28 difference, it's all about flow and efficiency.



I think this thread might belong in a general section or at least All motor, if anyone agrees let me know and I'll move it.

Would adjusting the fuel pressure be a good option for guys using the Jwt ecus, or are their ecus able to compensate for changes alone with no adjustments.

well gentlemen, in my 1st post i did say.... whats your opinion in terms of 1/4 mile results... i figured the dyno wouldnt be the best measure, and I know CAI suck up water (who doesnt?) but on the 1/4 mile, thats not the case.
So would a CAI yeild better 1/4mile times? Thats the myth Im interested in clearing up. As Ive heard of cases where people claimed to go to the track and did comparo's and came up with diff results

I have been considering switching to a CAI on my VE .I always wonder how effective a CAI is in FL....since the pavement radiates so much heat.
Anyone ever consider this?
I bet the air is just as hot down at the street level as under the hood here(at least in the summer)
MY car is a daily driver,not a dyno queen,or 1/4 mile shredder.I do plan on occasional track days when possible.

I have a custom cai on my VE but i can take it apart and have it as a wai when it rains or watever.When its CAI my filter is right in front of the tranny and at about the same height off the ground as the tranny. When its WAI it sits right in btween the distributer and the battery. Now from years of switching back n forth the wai has a better throttle response and it feels more torquey down low. On the other hand the CAI feels a lil more sluggish in terms of throttle response but it pulls harder at higher rpms. This is just from my butt dyno tho ..but i just wanted to share.

fuel pressure doesnt need to be adjust, either 3 or 4 bar depending on your setup.

then you data log your run and change and calibrate the cells in the ecu accordingly to make changes in your iginton or fuel map

i personaly have a wai on my VE but i do have some of the stock intake intack that runs into the fender/front bumper area. i have that area cut open a little with tubing to it and it flows the air right to the airfilter with jwt stack. soon i will have a ait sensor and i will post info if i remember.

I agree with this statement.

I think Topdog was asking about ECUs that we cannot reprogram, like a JWT ECU. In which case, my answer would be that, within bounds, the AFR at WOT can be changed across the board by changing fuel pressure without adversely affecting the closed loop portion of the fuel map, which will compensate through feedback.

dont think it really matters to be honest, a car consumes so much air that it would only be injesting under bonnet air for a second or two before it starts pulling fresh air from outside of the car.