Shameless -- With the new logs I am not really sure how the open lid is beneficial other than for some reason the knocks were less (unless that was a label mistake).

JCS -- Am I missing something here? Also with the open lid you will get more hot air than with the stock setup.

 

With my side cutout I notice particularly:

- a reduction in pressure drop as measured by the barometer
- no difference in temperatures that I can tell in typical use
- easier to hold top end boost and/or lower knock sums at the same boost level

Airflow meter frequency readings will be maxxed out where this helps.

I'm convinced of the performance benefits summer or winter on my car in my weather conditions.

 

are you guys still running the air scoop without the top of the box? i ran my car for a while with the top of the box off and didnt notice anthing positive or negative. i also still use the guide because i figured it would at least guide some cooler air over to get sucked in.

 

I know that CBRD, JCS, and myself still use the 'air scoop' or cold air intake....

 

Yes, the scoop is still in place in my tests.

 

You had me worried because I'm not looking for more noise. So I decided to test this myself. To test for noise increase, I pulled the snorkel off my stock (unmodified) airbox cover and went for a drive. I could detect no difference in suction or blowoff valve sound except perhaps at WOT 7000 rpm.

 

Later today, I'm going to do some temperature measurements with and without the snorkel installed on my stock (unmodified airbox).

 

So absolutely no downsides to this, (other than idle during summer weather -heatsoak), are there any alterations in the MAF frequencies?

Upsides is that the car will hold boost longer throughout the entire RPM range and sounds of the BOV/intake echo a little louder?

 

I have the modified cutout in the side opposite the motor and I did not hear a big increase in BOV or turbo sound...maybe it's just me...

You think it's necessary to unplug and battery and reset the ecu or will it self adjust?

 

you do not need to reset the ecu....

 

A while back a guy had posted that he had measured a negligible difference in intake air temperature (IAT) between the stock intake box and a Buschur cone intake. (https://www.evolutionm.net/forums/sh....php?p=3614772) Since his test looked like a well-executed comparison, I believed the result and assumed that the stock cold-air system didn't provide a significant advantage. However after Shameless saw a big difference between the stock box with and without a hole in the side of it, I decided to test the stock intake system with and without the stock cold-air snorkel. Here are the test conditions:

* Outside air temperature was around 50 deg F.

1) Warm up car by driving around for 20-25 minutes. MR/RS engine oil temp gauge holding steady at around 63C during steady driving.

2) Remove intake snorkel.

3) Drive for about 3 minutes at 50 mph before starting data logging with EvoScan.

4) Drive set course which includes highway driving, city driving, idling, cruising, and WOT in 1st thru 4th gear.

5) Stop car, reinstall intake snorkel.

6) Repeat steps 3 and 4.

Note that I ran without the snorkel first so if anything, the engine was cooler during the "no snorkel" run.

The results, which are in the attached file below, were pretty stunning for me. IAT without the snorkel was consistently 20-25F higher regardless of the driving conditions. Based on this result, I will not be cutting into the side of my stock airbox.

 

But that's with the snorkel removed, so the only input is from inside the car bay above the radiator and IC.

I woudl guess that snorkel on and hole in the other side is a different matter.

I have a spare lid from a while ago, I'm going to slice and dice mine tonight.

 

mrfred,

That's the whole point of cutting only the side opposite the engine....to minimize the increase in IATs.

When you removed the snorkel, not only did you remove the cool air source, but you left a hole on the side next to the engine. Obviously intake temps will go up.

Also, whoever did a test with an open cone filter and had no changes in IAT in comparison to the stock airbox obviously skewed his results towards the aftermarket piece or he didn't know what he was doing.

I'm pretty sure jcsbanks already datalogged plenty with the hole cut in the stock airbox opposite the engine. There was no increase in IAT. Simply a descrease in the pressure drop, which can be viewed by logging baro.


Eric

 

I guess I'm going to have to get my buddy's airbox cover, cut a hole in it, and take more data.

 

I just cut the side of mine today and I noticed a huge noise increase. It sounds just like you have an aftermarket intake.