[hassmaschine]

Originally Posted by rick100

running k & n filter on mine for over a year , zero problems , headers and all included

Also ran it in my others cars without any issue

Same, only its been almost 3 years and with 2 E9x's.

Haters gonna hate.

[CobraMarty]

Haters...

3-5 HP gain up to 10HP at top end doesn't seem like much but when you also have a PI exhaust or similar with 3-5HP gain and 3 stage intake and maybe headers, Adding up all these 3-5 HPs and you end up with a 20-25 HP gain.

PI is just one more piece to the puzzle, a step in the performance ladder.

[Terraphantm]

It doesn't necessarily just add up like that.

In any case, a 3 stage manifold alone conservatively adds about 25-30hp on a 328. So a single stage car is definitely not bottlenecked by the US intake.

[Taskmaster]

Originally Posted by Terraphantm

It doesn't necessarily just add up like that.

In any case, a 3 stage manifold alone conservatively adds about 25-30hp on a 328. So a single stage car is definitely not bottlenecked by the US intake.

If I can find the run files, I'll break it down - but red is the Injen.
That large pipe had the biggest mid range gains (15wtq!) by far, but you can see it actually lost a little low end torque. I didn't run a heat shield on it either, so maybe it could have made more peak.

Blue is the AFE - again really nice mid range gains (10wtq?) and best peak power, it's also remarkable consistent (I ran it multiple times) so that box is effective.

Green line is dry filter, carbon filter removed - about 2whp or so difference over the stock box with a K&N (but carbon filter still inside)

[Greyfox]

Originally Posted by TheAxiom

If I can find the run files, I'll break it down - but red is the Injen.
That large pipe had the biggest mid range gains (15wtq!) by far, but you can see it actually lost a little low end torque. I didn't run a heat shield on it either, so maybe it could have made more peak.

Blue is the AFE - again really nice mid range gains (10wtq?) and best peak power, it's also remarkable consistent (I ran it multiple times) so that box is effective.

Green line is dry filter, carbon filter removed - about 2whp or so difference over the stock box with a K&N (but carbon filter still inside)

Do you have the chart as compared to a completely stock car?

[Taskmaster]

Originally Posted by Greyfox

Do you have the chart as compared to a completely stock car?

Yeah, somewhere. It was 216/189

[rjahl]

Originally Posted by TheAxiom

[

If I can find the run files, I'll break it down - but red is the Injen.
That large pipe had the biggest mid range gains (15wtq!) by far, but you can see it actually lost a little low end torque. I didn't run a heat shield on it either, so maybe it could have made more peak.

Blue is the AFE - again really nice mid range gains (10wtq?) and best peak power, it's also remarkable consistent (I ran it multiple times) so that box is effective.

Green line is dry filter, carbon filter removed - about 2whp or so difference over the stock box with a K&N (but carbon filter still inside)

Great data, thank you for pulling it up.

How much of this could be considered statistical noise? In other words, were these an average of three pulls or the peak pull of each specimen? What was the average variation of these runs and where they all done on the same day?

I'm not trying to be a prick about this, I look at a lot of performance test data that has wide deviations and small improvements beyond our resolution required more data sample to validate.

[anjuna]

Originally Posted by rjahl

How much of this could be considered statistical noise? In other words, were these an average of three pulls or the peak pull of each specimen? What was the average variation of these runs and where they all done on the same day?

You and me both buddy. When I hear about people claiming 2hp gain/loss, it's just noisy bro-science to me.

[Taskmaster]

Originally Posted by rjahl

Great data, thank you for pulling it up.

How much of this could be considered statistical noise? In other words, were these an average of three pulls or the peak pull of each specimen? What was the average variation of these runs and where they all done on the same day?

I'm not trying to be a prick about this, I look at a lot of performance test data that has wide deviations and small improvements beyond our resolution required more data sample to validate.

Originally Posted by anjuna

You and me both buddy. When I hear about people claiming 2hp gain/loss, it's just noisy bro-science to me.

Same day, same day dyno and strap down:

Stock with K&N vs OE Tuning V1


K&N +Tune vs Carbon delete and dryflow filter (note that it's run 3, which most of the intakes increased in power as the car warmed up)


K&N + Tune vs AFE
Note run 4 for the AFE made the most, but all the runs were consistent, and the AFE didn't seem to have heatsoak issues. Would probably make more power with another run...who knows.


K&N + Tune Vs INJEN

The Injen lost power with each successive run



There page here:
http://www.e90post.com/forums/showth...=918378&page=7

I'd love to do a new test, AFE vs Modified box and elbow and Injen with a heatshield, but my car is barely running right now.

[CobraMarty]

When items are tested individually sometimes you can see results like +2, +3, +5.
And when tested all together you can see more or less of the sum, +6 or +12.

No you can't just add the individual results together. Sometimes your final results depends on previous mods. It is the combination/package that counts. One item is not a combination or package.

[Taskmaster]

Originally Posted by CobraMarty

When items are tested individually sometimes you can see results like +2, +3, +5.
And when tested all together you can see more or less of the sum, +6 or +12.

No you can't just add the individual results together. Sometimes your final results depends on previous mods. It is the combination/package that counts. One item is not a combination or package.

I agree. On my Z3, I had an intake and a shark injector - both of which are said to do very little on their own. I dynoed them separately and together, and just like you said, together they had gains of over 14whp in some parts of the RPM band.

[rick100]

Originally Posted by CobraMarty

When items are tested individually sometimes you can see results like +2, +3, +5.
And when tested all together you can see more or less of the sum, +6 or +12.

No you can't just add the individual results together. Sometimes your final results depends on previous mods. It is the combination/package that counts. One item is not a combination or package.

whats the cost of the k and n filter ? I m pretty sure is less than 100 $ , if people are paying 800 for headers + 500 intake ( give it or take) and 700 for bpc tune and maybe 500 in labor to get roughly 40 whp at the most , thats about 2500 in total

H/I/T combo 2500 $ - 40 whp - 65 $ per whp
k and n filter combined with full bolts on- 100 $- 4WHP (conservative) - 25 $ per whp

Considering this platform is so hard to get hp , I take any HP I can get for 100 $

Personally I did the k and n filter after I went full bolts on and it made a different , the car was more responsive in acceleration , enough to for me to feel it .

[Zajac1]

Originally Posted by 3point6

Thanks for the feedback, I'll clean the MAF although I must say that the 'funny smell' of rich gas mix seems to be fading away and the idle start to get closer to normal if there's such a thing, when I swapped the air box noticed that the stock intake hose have a bottom duct, sort of a hole at the lower portion, I assume it was some kind of drain maybe?, when I looked at those pictures you've sent, seems like the aftermarket silicone tube goes straight, is there any advantage of that?
So based on your avatar, you have a 3-series wagon with an updated front grill?, if so, can you share a picture? I remember seeing an updated version similar to the newer models, just curious if that's yours, thanks

From what I red silicone tube deliver air smoother than plastic tube. Maybe it helps, but I personally didn't feel any difference. For few $ you can give a try.
Yes, I own e91. Here is few pics with m4 grill on.

[rjahl]

Originally Posted by TheAxiom

Same day, same day dyno and strap down:

Stock with K&N vs OE Tuning V1


K&N +Tune vs Carbon delete and dryflow filter (note that it's run 3, which most of the intakes increased in power as the car warmed up)


K&N + Tune vs AFE
Note run 4 for the AFE made the most, but all the runs were consistent, and the AFE didn't seem to have heatsoak issues. Would probably make more power with another run...who knows.


K&N + Tune Vs INJEN

The Injen lost power with each successive run



There page here:
http://www.e90post.com/forums/showth...378&page=7

I'd love to do a new test, AFE vs Modified box and elbow and Injen with a heatshield, but my car is barely running right now.

Thank you, you are one of the few that actually tests things correctly.

This could be one of the areas that separate our cars. As I mentioned before I have something to clear and once that is settled I would like to spend a full day at the dyno qualifying and fine tuning my setup.

[CobraMarty]

Interesting that the Injen lost about 2-3HP across the board. It has a nice smooth curved elbow and MAF tube. The truth is that the open element is sucking hot under hood air and the 'heat shield' is blocking the stock inflowing air as it attempts to block engine heat. Would probably do better with the 'heat shield' removed. So the 2-3 lost HP is probably due to the hotter intake air. +10* = 1% HP loss.

[3point6]

Originally Posted by Zajac1

From what I red silicone tube deliver air smoother than plastic tube. Maybe it helps, but I personally didn't feel any difference. For few $ you can give a try.
Yes, I own e91. Here is few pics with m4 grill on.

Nice looks, somehow it refreshes the appearance providing a more upscale presence, thanks for sharing and will decide if the aftermarket tube is for me

[Zajac1]

Originally Posted by 3point6

Nice looks, somehow it refreshes the appearance providing a more upscale presence, thanks for sharing and will decide if the aftermarket tube is for me

no problem, that's why we are here

[CobraMarty]

There a couple of different makers for the silicone intake tube. One better than the other? Fit?

Rev Motoring-
https://www.amazon.com/Rev-Motoring-.../dp/B00MZS08DY

Mishimoto-
https://www.amazon.com/Mishimoto-MMH.../dp/B01GA9WB8S

[hassmaschine]

There was poor feedback on the Mishimoto version AFAIK.

Haven't had any issues with my Rev Motoring hose.

[Zajac1]

Originally Posted by hassmaschine

There was poor feedback on the Mishimoto version AFAIK.

Haven't had any issues with my Rev Motoring hose.

Same here. No problems at all with Rev Motoring tube.

[jdspeed99z]

I did the euro box on my '06 330xi 6MT and it really woke the car up down low. It really felt restricted with the factory box and carbon filter in place.

Before the EB just wasn't fun to drive and I took less chances in traffic with it. I was driving 70 miles each way to work through back country roads, surface streets and 2 lane highways. The car was fast, but not really as quick as I would have liked.

So after the euro box, it was way more fun to drive without having to downshift every time I wanted to speed up, then I enjoyed driving so much I took the CDV out, and put a new set of O2 sensors in it, and it's been a sweet drive back and forth to work.

Now I just want to do a tune, and maybe code in some changes, and I'm done. I've had the car for about a year enjoy it every time I drive.

IMHO the eurobox is definitely worth doing.

[Bluewater328iT]

Originally Posted by TheAxiom

I agree. On my Z3, I had an intake and a shark injector - both of which are said to do very little on their own. I dynoed them separately and together, and just like you said, together they had gains of over 14whp in some parts of the RPM band.

Have you tested the Euro box intake yet? I thought you sold the AFE and were going to get a Euro box.