Oh, yes...you are correct...

 

This just makes no sense to me. If the air after the turbo were a "constant" then the CAI would make no difference.
The rate at which the turbo heats the air at the same given pressure is relative. Cooler air in equals cooler air out. The relationship is there and so long as the turbo is hitting the wall on efficiency the relative temperature holds true.
To see this put a temperature sensor pre and post and then take reading in the morning at say 70 degrees ambient and then later in the day at 90 degrees ambient. As was stated above, the car will make more power on a cooler day because the air being compressed is more dense with oxygen and this is also compounded by the incooler efficiency in the cooler weather.

 

I actually had the same idea, but was worried about water getting into it. What do you guys think?

 

If you take temp on intake side and output side, like you said, then measure it in the morning at 70, you'll have an output of what, like 140? If you measure it later in the day, and the input is 90, then you will not have a perfect relationship, you get like 145 on the output side. This renders a cold air intake not as effective in a turbo car.

Early in the morning, when you first start the car and everything is cooler, like the turbo, the intake, and all the plumbing, the intake charge actually reaching the cylinder is way cooler. This is why everyone says their car feels faster in the morning...because it is cooler out, and the car itself is cooler.

 

That's a nice D.I.Y mod, looks really good after the clean up job.

 

Im guessing noone read the disclaimer under my post hinting at the sarcasm contained in my reply. >shrug<

 

The major advantage of a cold air intake is it allows you to suck more air and is more effective if matched with fuel. The Delta T (change in temperature) across of the turbo has less affect. Sucking in hot air reduces the efficiency of the intake system as a whole and does affect performance. It is difficult to estimate without a dyno due to different turbo efficiency, pressure altitude etc.

I think the change in flow characteristics and velocities have a bigger impact on the Karman conversion and MAF accuracy than hotter air etc. Vishnu's One Lap America monster has a stock intake.

Speedlimit... :

 

Tri-Bar, did the same box cut at friend's machine shop today and have ordered the K&N panel. I assume the noise level will be somewhat louder with the K&N. Great, simple mod. Thanks for the creativity.

 

Yes, It a little louder. Sounds better.

 

Very cool.. Nice job.. the only issue would be on cars where its not as easy to leave that airbox in place due to custom MAF pipe or intercooler.. Personally, I never experienced any stalling issues with a cone filter.. MAF Anomolies (running lean in places) I have had happen though..

 

Nice idea and cheap. Even if you have a cone filter an air box is a good idea. it will let you ducked cold air from the front air dam into the filter box! Norris Design runs one to good effect. You can use the stock box if you can get it to fit, then cut holes in the front and duct air off the bumper to the underside of the box. This is a common mod on EVO VI rally cars as they have problems with high intake temps (low speeds, high rpm).

On the "hot air is better than cold air", please read up and think about these things. hot air is less dense, i.e. less O2 molecules per volume. As the maximum negative pressure you can get is -1bar you want as many molecules of O2 in the air you pull in as poss. therefore cold (read dense) air is better.

Hot air has a similar effect to running a car at altitude. This is way on really hot days (when you are used to cold weather anyway) you feel slightly breathless and tiered!

With spool up, YOU NEED COLD AIR!!!!!! Cold dense air allows the N/A side of the engine to perform better, producing more exhaust gas and therefore reducing spool times!

Thanks Chris.

 

that is a disaster...come on guys you are going to be getting heat soak with a mod like that.


get a propper box and a propper filter

 

that looks cool mate. any more info on it? be nice to remove the headlight and get some "ram effect"! is there much ducting on it?

Chris.

 

i have installed some cold air ducting into the box. however this is not part of the kit, it basically uses the gaps around the light and body etc etc to draw in the air. after a hard drive you can touch the box and it is cold to the touch. a good testament to its ability to stop heat soak.

its really simple piece of kit, a lid and a side. very reasonable too. i got it shipped from www.takakaira.com to the uk for good money including the apexi Power intake.

it is also a handy cubby hole to bolt your orm boost solenoide to. keeps it nice and cool

 

Man, is it just me or do those guys (takakaira.com) have the most user UN-friendly website!? It's so difficult looking for things... unless you already know what you want.