This post is for people who are trying to maximize the components they have. It's here to provide data for people who may have similar set-up's. I am NOT trying to tell anyone to do this or that.

It's just a data point for evom members. Enjoy

I am a tight bastard that doesn't have much money to spend on my car, so i try to make as much stuff as possible. People who know me ( like 3 people ), already know that fact & those of you who don't, allow me to introduce myself

I have been debating for a long time about the merit of all these cold air intake's out there. Lets face it, the oem unit makes the incoming air go through some crazy ninja six-flags rollercoaster ride before it even gets to the turbo.

I plunked down some of my shiniest quarters for parts to build a CAI similar to Buschur racing unit...it's basic & is a straight forward design.
https://secure.buschurracing.com/cat...e445a525224af0

I tune my car with a aem & i run "speed-density" => no need for my maf.

I left my stock intake tube in place as a majority of west coast tuners boast "the oem intake is good for 400-450 hp" & since i have basic mods, i didnt think the value in making a CAI was important.......BOY WAS I WRONG

Below is a boost & engine speed compare of a oem intake system w/maf utilizing a K&N drop-in filter vs my CAI.

The results speak for themselves +2.5 psi more boost @ 7k! Look @ the acceleration difference between the 2 rpms!!!

The boost controller was unchanged!!

BTW, My mods are: HKS 272i/264e @ -2/0, turbo xs fmic, tme w/10.5, hallman mbc & the rest of the mods are made by me => 3"tbe ( w/2 long a$$ resonators + a 18" long big fat muffller), 3" o2 housing, LICP, 65mm tb, Test pipe, CAI, while being tuned by me too.

The CAI log was taken on the way to get dyno'd @ Yimi Sport tuning where i laid down 363whp / 363.98 tq on 91 octane

if you can ditch the oem intake & maf, do it

 

i like what i read and im happy another do it your selfer is making his own shat. i have a few ideas i am gonna implement when i get back from teh sand box. nice numbers you put down.

 

The differences in load and engine speed are due directly to the random increase in boost. That doesn't mean the CAI is that much better. You can run more boost if you want to through the stock intake.

Smogrunner put down 582whp on the fully stock intake, so it's not that bad, not to mention all the work required to switch to speed density is not worth it for 99% of Evo owners.

 

Smogrunner made 582whp with the stock box.. wonder what it would have made with an intake like Buschurs on the next pull? My point is it may support XXX hp but how much gain could be had by using an intake?

 

I would think there would be more of a benefit in not running the restrictive MAF anymore more than the intake tube itself.

 

The last time i crank up my mbc, the only increase that i received was a higher boost spike & no gain in boost level @ the higher revs. So that is where & why i left the mbc.

good for smoggy for achieving 584 on the stock airbox / maf etc. 1 of the major differences is that he is not using the oem turbo, i am & that is why i am trying to maximize what the oem turbo has to offer.

Your comparing apples to oranges warralton, you know better than that.

I bet if you geeked the oem maf in front of a top fuel car, prior to the TF engine inhaling our whimpy little honeycomb maf sensor, their engine would make in excess of 1000hp....Are you going to stand on a soap box boasting that the maf can support 1000hp? Doubt it

so now i am talking about 2 different cars, let get back on track, still using smoggies car as an example, since that is what you chose.

I am willing to bet smoggy's car would make 500whp with the stock exhaust & cat.

So now are you going to go around preaching "the evo oem exhaust system is good for 500 whp"?

HELL NO. Your going to maximize the power you can with the components you have.

This post is for people who are trying to maximize their stock turbo who have a aem, autronic or a means to get rid of the oem intake tube & maf.

 

The stock intake setup (airbox and all) is very restrictive and has been proven by many logs. I myself have posted many logs in the ECUFlash forum that shows the pressure drop and resulting decrease in air density.

JCSBanks has also done a lot of testing and he has shown excellent results on the stock airbox by simply cutting a small portion away on the opposite side of the engine.

I agree with WOT. The stock setup is restrictive. Can you run XXX HP through it...sure, but that's not his point. His point is that you can get more out of your same setup if you remove the restriction. In his case, that allowed to achieve a higher boost being held to redline.


Eric

 

Interesting, Maybe teh Buschur Unit is needed?

 

Hi Eric, cutting it like this?


Abner

 

But that is nothing new either. If people want to go through all that trouble and cost to run speed density on the stock turbo, then that's fine. 99% of people will not have the means nor the desire to do that, but yes gains can be found.

 

I think everyone is aware that it is possible to make slightly more power with an intake over the stock airbox but I believe the following issues exists:
1. The MAF readings being wrong (causing the car to run lean)
2. The MAF readings being erratic depending on brand and type of tubing (not following a linear increase but jumping up and down)

After proper tuning it was possible to gain a few HP over the stock setup with the intake but tuning was required. I'm sure the more power one wants to make the more of a restriction the stock airbox will be. On the other hand the OP doesn't use the stock ECU or stock MAF sensor, so in his case it makes sense to use an intake ... but it is also more expensive to go that route

 

Abner you could also do it like this:

 

Abner,

Actually John saw excellent results with just cutting a very small portion away from the side of the box that is opposite the turbo/engine. Nothing on the top was cut at all...just a small piece from the side. This also kept unwanted heat out. I'm pretty sure he posted pictures in the ECUFlash forum. Once I find an extra lid, I will be doing this myself to conduct my own experiments.

I completely agree with this, but you can still use the stock MAF in this case and use your MAF tables in the ECU to recalibrate for the correct air flow readings. I did a little research on my own for this and there is a big thread with some findings in the ECUFlash forum. But in general, I would agree that you should stay away from intake setups that dramatically alter the airflow reading.


Eric

 

Here a few pics of my cai & dyno sheet from yimi's

I am still in the process of making several heat shields & a additional cold air duct

The dyno run was performed on 91 octane (Union 76 station)

My mods are: HKS 272i/264e @ -2/0, turbo xs fmic, tme w/10.5, hallman mbc & the rest of the mods are made by me => 3"tbe ( w/2 long a$$ resonators + a 18" long big fat muffller), 3" o2 housing, LICP, 65mm tb, Test pipe, CAI, while being tuned by me too.

 

Hi John, i did not cut off the top totally b/c i wanted to still use the snorkel......now its just there to hold the MBC in place