CAI on a VE

Serban · 12-09-2005, 11:40 PM

Well, I put together a cold air intake on my NX tonight...and honestly, I can't tell if it made any difference...

the butt dyno tells me nothing. Here's the money shot

WickedSR20 · 12-09-2005, 11:52 PM

I guess I'm not the only one then. Switching from my warm air set-up and changing it to a cold air set-up made no noticeable difference to me either. The way I do my comparisons is I have this back road (4 lane country road) where I do a majority of my testing. I line up by one telephone pole and make a run to the next telephone pole. I do this before and after my mod session and note the mph at the 2nd pole both before and after. If there was any gain for me, it was a real slight one. I'll try going back to the WAI when I get a few more mods on the car and see if it makes a bigger difference.

rigged200 · 12-10-2005, 07:57 PM

did you guys use the pop charger for a filter....because i can tell a difference from a pop charger and just a filter.....

eric96ser · 12-10-2005, 08:21 PM

Quote:

Originally Posted by Serban

Well, I put together a cold air intake on my NX tonight...and honestly, I can't tell if it made any difference...

the butt dyno tells me nothing. Here's the money shot

Did you put the MAF in the fender with the filter? I swapped from a CAI to a WAI, and I never noticed a difference.

Serban · 12-11-2005, 12:31 AM

I'm using a pop charger, and yes Eric, its in the fenderwell.

madandy · 12-11-2005, 01:25 AM

Serban, is yours a Hotshot CAI or your own handy work?

intiractive · 12-11-2005, 01:39 AM

the peice in the middle with a blue clamp is for like a lowport lol, thats probably his old wai.

JimmyNX2000 · 12-11-2005, 03:55 AM

keep the maf and filter as close to the TB as possible, and run ducting to the filter.

wildmane · 12-11-2005, 04:34 AM

But the point of a CAI is to be sucking in ambient air temperatures, and not engine air temperatures. The routing will only work at higher speeds when ambient air is being pushed into the tubing and against the filter. What you're describing is just a WAI with ducting run to it, and won't provide much gain unless you are at higher speeds, correct? I guess I'm not seeing the reasoning behind keeping the filter as close to the TB as possible..

viprdude · 12-11-2005, 05:06 AM

the air near the filter is further away from the engine than air farther from the filter, correct? the air closer to the throttle body is the closest ambient air temp going into the engine you are gonna get.

Serban · 12-12-2005, 02:15 AM

This is quite a frankenstein cai put together from a 90 bend, the custom cai I had, and a highport WAI.

It cooled down a bit tonight, probably in to the high 50s, and at full throttle it does feel like it has a bit more kick to it.

wildmane · 12-12-2005, 05:10 AM

Quote:

Originally Posted by viprdude

the air near the filter is further away from the engine than air farther from the filter, correct? the air closer to the throttle body is the closest ambient air temp going into the engine you are gonna get.

I was talking about what JimmyNX2000 was saying, he was suggesting the filter to be placed nearest the engine, and I was questioning that. In other words, I agree with you =P

Sweet homemade CAI serban! Whatever works

paNX2K&SE-R · 12-12-2005, 07:55 AM

Really? Hmm maybe I should throw on the pop I have sitting around. I currently just using the hs filter that clamps to the pipe.

Quote:

Originally Posted by rigged200

did you guys use the pop charger for a filter....because i can tell a difference from a pop charger and just a filter.....

lalito · 12-12-2005, 10:36 AM

I have a pr cai and I notice it is better on the low end then wai, but the wai seems better up top...

viprdude · 12-12-2005, 02:06 PM

wai does not really give more up top, it gives less, but it gives more down low where u can notice it easier. longer cai means more top end.

Sabre 200 Gxi · 12-13-2005, 08:43 AM

I love CAI topics... he he

What about Volume and diameter of the piping? Also, the distance of the TB to the MAF.

It seems like the MAF is a restriction in itself, how will a bigger than 3" diameter between the MAF and TB affect the CAI's performance?

What may work well is a 2.5" diameter between the TB and MAF, fairly close to each other, say 4-5" and then a much larger diameter, say 5" pipe from the MAF to the Air-filter. It will have to narrow a bit near the filter though and have a pop charger type inlet.

Serban · 12-13-2005, 10:03 AM

5" diameter piping sounds massive, I'd have to cut out my whole wheelweel just to get that thing down there! I kept it all 3", plus the maf is not in between the cai, but at the very end. We'll see what it does at the track tomorrow

Sabre 200 Gxi · 12-13-2005, 10:08 AM

Well the theory behind this is that volume is obviously a good thing, but too much volume between the MAF and the TB will slow down the air speed. Having all the volume available in front of the MAF, and then a fairly quick entry into the IM makes sense.

Ja the 5" whould preferably not be mounted in the fender. WAI

Serban · 12-13-2005, 10:22 AM

So from tb to maf there should be a 2.5" diameter section, then maf to filter 5" diameter and keep the filter in the engine bay? I don't even know if there's room to do something like that. But wouldn't having the maf at the very end of the intake be just as effective as using some 5" diameter pipe?