Amby is right, SRI nets you more throttle responce, CAI get you a tiny bit lower air temps, but by the time the air makes it into the cylinder, its only like 5 degrees cooler from a CAI and 5 degrees aint poop when your cylinder temp is still over 400 or 500 deg.

CAI typicaly have a deeper, throatier tone though the longer pipe. Thats about all. Want lower intake temps? Cryo the intake pipe! That will make a difference.

 

then why do CAI's make massively more hp and tq gains on the RSX Type S??? it has been proven for YEARS in the honda community. do you have a shred of evidence to disprove 6 years of empirical data? and that's only for the K-series. you have like another decade's worth of data for the B-series...

maybe you shoulda said SRIs are better for the crappy stock 4B11 instead...

 

Who gives a s**t about Honda motors? I don't have a K-series under my hood.

Your reference about the "crappy 4B11" makes your comments seemed biased and also stupid. Why are you here if you just want a badass Honda?

 

And? That's one application and doesn't apply to all cars. It could be due to differences in the motor and it's bottlenecks (ie. the stock intake system and engine bay is so hot that a CAI significantly drops the temperature), differences in the aftermarket intake designs or simple variability. Why does an S2000 gain little to nothing with bolt-ons? This is a well accepted fact as well. Why does an intake do squat on a WRX?

 

an intake does squat on an wrx, which is a turbo car? now ive heard it all

 

A lot of turbo cars show less than impressive results with an intake including the STI and the evo. In both cases, the stock intake isn't a limiting factor, hell the general consensus is unless you're over 400 hp, you're not even stressing the stock system.

 

One, Your comparing 1 brand to 30+ other brands. Honda motors are short stroke, high rev motors. They benifit from even the smallest amount of extra air.

Two, Like Amby said, most of the turbo cars are not hindered from the intake side! Hell, you want more power from a Sti or Evo, change out the up and down pipes, and exhaust. That is the first limiting factor for thoes two.

Most cars are not going to see wicked numbers from a pipe and a filter. Some will but they are the exceptions.

 

injen dyno'd their intake at a 9.xx increase in hp and 3 or 4 in torque. I notice a difference for sure.



souce: http://www.injen.com/docs/other/sear...elID=77&Eng=L4




edit: fixed pic size

 

That is a huge pic file.

Their dyno is a little screwey. They did the base line after they did thier part installed run the first time? WOW the A/F was crazy lean on that green line run! What was the difference between the 2 (part installed) runs?

Must be PZEV car.

 

if you read it they said that the green run was running too lean and could damage the engine. Not sure what engine it is, I am assuming PZEV as it only puts 130 to the wheels when Fed (and whatever the canadian cars) have been known to put down 140 to the wheels as a base

Doing some reading, it looks like they create the intake, dyno it. Then throw it through a flow model and do modifications. then they ran the baseline and the new 'MR improved' (not 100% sure what that means still) together.

 

I got all that, but an intake should not cause a motor to go that lean! But what ever they did worked. Good even numbers between hp and tq. I like to see that!

 

^^ yeah I will be honest I do not quite understand how it could cause it to go that lean.

The only thing I can think of is that the flow rate was TOO high and the ECU could not compensate enough or the fuel system could not compesate fast enough.

 

Well the ECU is out. It works faster than most home computers! Flow rate is out b/c a NA motor is only taking in the max volume the cylinder can ingest durring the intake stroke. The only thing i can think of is the injectors are so super small that they just dont flow enough or that the fuel pump cant keep up! But that is also highly unlikly. It was in the 15's! Thats like forced induction with no fuel managment LEAN! But it also went crazy fat rich on the base line run!

I have no idea where to go from here. Thoes A/F ratios shold not look like that from an intake. Stock running rich is normal. Manufactures do it to prolong the life of the motor. But really? What is going on at Injen?

 

Well, if you read Injen's propaganda you'd know that their "MR technology" is the "choke point" where the MAS mounts to the intake. If you look at their "MR Technology" intakes, you'll see that the piping narrows at the MAS mount point.

Without their "MR Technology" applied, I would assume there is no choke point there. A larger diameter intake tube would translate to lower air velocity in the intake, and the stock MAS will deliver incorrect air flow data to the stock ECU which would interpret that into needing less fuel, resulting in crazy leaness.

So, the "MR Technology" steps down their large diameter intake pipe to a stock size at the MAS mounting point. Doing this increases the air velocity through the smaller diameter tubing, and thus allowing the MAS to deliver accurate air flow data to the ECU, resulting in the correct amount of fuel being delivered to the engine for combustion.

 

Thanks for the explaination! That makes much more sense.