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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N55 Turbo Engine Tuning and Exhaust Modifications - 335i Tuning > Custom N55 Piping Project (road to 400whp)



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      03-24-2011, 03:47 PM   #1
Keik E92 M3
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Custom N55 Piping Project (road to 400whp)

Okay after being at the dyno yesterday i was a little disappointed in the way my car acted on the dyno and produced low hp numbers due because the procede kept going into valet mode due to overboost. But other than that the car pulls hard on the street. So i decided i was going to put a little more money into the car and work on my piping.

custom 2.5" intercooler piping
custom 3" exhaust
custom 3" cold air intake

I took a look at all the sensors on both intercooler piping and intake piping. and from my understanding all i have to do is make sure each sensors are in the exact same place as they are with stock piping correct? "please correct me if i am wrong"

Also as for my exhaust i am thinking about going single piping all the way back and then split to duals at the rear of the car. So single 3" piping from turbo DP all the way back, instead of dual piping all the way back..



What do u guys think about my project? I am getting ready to start up my drafts and send it to my guy to do all the mandrel bending etc...

Car specs well be as follows:
Procede
GODSPEED intercooler
custom intercooler piping and exhaust
No cats

Also wondering where i could get some good sounding mufflers from? I will just need mufflers only.

Last edited by Keik E92 M3; 03-24-2011 at 06:30 PM..
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      03-24-2011, 03:53 PM   #2
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The only thing about going the "custom" piping route is expense + most designs have already been tested by tuning companies and they settled on the best design. You're starting from scratch. Only other thing I'll say is that you'll want larger than 3" exhaust if you're running a single pipe.
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      03-24-2011, 03:55 PM   #3
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If you end up doing a custom intake, please PLEASE do a detailed writeup on everything involved, for those of us who don't want to spend $400 on 18 inches of pipe and a cone filter. Same goes for custom intercooler setup.. it would be a huge service to the N55 community. Are you going to do a huge intercooler or stock fit with no cutting the shroud?
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      03-24-2011, 04:02 PM   #4
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Quote:
Originally Posted by wren57 View Post
The only thing about going the "custom" piping route is expense + most designs have already been tested by tuning companies and they settled on the best design. You're starting from scratch. Only other thing I'll say is that you'll want larger than 3" exhaust if you're running a single pipe.
I was thinking the same thing, but thought maybe it might of been a over kill.. Would you say 3.5 " or 4" for the exhaust? i would think 4" would be too much.

I can have everything done for a real nice price, where talking almost putting a gun to the guys head and getting it for free price lol. He real good at it and does work for dirt cheap, his shop been around for 15+ years i believe.
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      03-24-2011, 04:04 PM   #5
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Quote:
Originally Posted by IancoleTX View Post
If you end up doing a custom intake, please PLEASE do a detailed writeup on everything involved, for those of us who don't want to spend $400 on 18 inches of pipe and a cone filter. Same goes for custom intercooler setup.. it would be a huge service to the N55 community. Are you going to do a huge intercooler or stock fit with no cutting the shroud?

I will do writing along with pictures.

As for the intercooler i am debating i might go with a huge one.
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      03-24-2011, 04:27 PM   #6
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keikdasneak u don't want to go CX instead of Godspeed?
are u coming down to socal this weekend?
if so pm me.
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      03-24-2011, 05:20 PM   #7
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keikdasneak u don't want to go CX instead of Godspeed?
are u coming down to socal this weekend?
if so pm me.
Pm sent.
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      03-24-2011, 05:21 PM   #8
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Those are minor mods. The problem is the turbo which is too small and cannot hold enough boost when needed.
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      03-24-2011, 05:23 PM   #9
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Careful messing around with the intake tube. Changing diameters will cause MAF misreading errors and will likely result in fueling/boost issues. Not sure how useful that mod is given that the turbo is the first restriction, not the intake piping.

Shiv
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      03-24-2011, 05:35 PM   #10
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Quote:
Originally Posted by shiv@vishnu View Post
Careful messing around with the intake tube. Changing diameters will cause MAF misreading errors and will likely result in fueling/boost issues. Not sure how useful that mod is given that the turbo is the first restriction, not the intake piping.

Shiv
Bingo! For once I can agree with Shiv!
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      03-24-2011, 05:47 PM   #11
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So if you increase piping this will allow the turbo to sustain boost, and does the Proceed go into valet mode as a safety precaution?
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      03-24-2011, 05:50 PM   #12
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Change the turbo!
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      03-24-2011, 05:55 PM   #13
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Quote:
Originally Posted by dlbrooks18 View Post
So if you increase piping this will allow the turbo to sustain boost, and does the Proceed go into valet mode as a safety precaution?
Increasing intake/intercooler pipe diameter will have little to no effect on turbo boost/flow capacity at this point.
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      03-24-2011, 05:56 PM   #14
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Bingo! For once I can agree with Shiv!
It must feel good to be right for once
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      03-24-2011, 05:58 PM   #15
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Intake

We have dynoed our N55 with open air box with virtually no restrictions. At the same boost pressure the car made ZERO horsepower. The restriction is at the turbo itself. To make a custom intercooler/piping any other product cost money. To custom prototype something is not cheap especially if you don't have a dedicated shop or tools to use. Intercooler cores are important for flow efficiency. Bigger is not always better. Just like the exhaust for these cars. 4" exhaust is WAY too big for a fist size turbo. 3.5" may be the better route to go, but keep in mind 3.5" piping is more expensive than 3" or 4" piping and not every company can do 3.5" mandrel bend.

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      03-24-2011, 06:29 PM   #16
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Quote:
Originally Posted by Robert@vishnu View Post
We have dynoed our N55 with open air box with virtually no restrictions. At the same boost pressure the car made ZERO horsepower. The restriction is at the turbo itself. To make a custom intercooler/piping any other product cost money. To custom prototype something is not cheap especially if you don't have a dedicated shop or tools to use. Intercooler cores are important for flow efficiency. Bigger is not always better. Just like the exhaust for these cars. 4" exhaust is WAY too big for a fist size turbo. 3.5" may be the better route to go, but keep in mind 3.5" piping is more expensive than 3" or 4" piping and not every company can do 3.5" mandrel bend.

Robert@Vishnu
I'll hold off on the intake part...

I was thinking the same thing as for the exhaust.. 4" just did not seem right... I want to go 3" all the way back to the dual setup , then have a nice sounding muffler at the back... Like how the AMS Exhaust setup is.

Last edited by Keik E92 M3; 03-24-2011 at 07:13 PM..
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      03-24-2011, 06:49 PM   #17
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I have never seen this engine in person

honestly what are we talking about here to put a larger turbo on it?

thats where the gains are apparently.
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      03-24-2011, 07:07 PM   #18
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Quote:
Originally Posted by Sniz View Post
I have never seen this engine in person

honestly what are we talking about here to put a larger turbo on it?

thats where the gains are apparently.
I'm sure that question will definitely be answered before too long.
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      03-24-2011, 07:20 PM   #19
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keik's on a mission.
it's seem to me he likes to get his hands dirty.
which is cool.
who doesn't like wrench'n around.
I know ur doing this all on ur dime.
props to you.

i'm doin' the same project with
the fmic.
i love those RX7 Vmount intercoolers.
what a cool, inexpensive alternative.
- I'll say this, there's cut'n and custom work
to be done to them. It's not plug n play -
this is unmark'd territory for the N55.
you may say it's like the N54 but you don't
know till you try it and confirm.

just read up on the other threads and
the DIY.

and
yessss Sniz, big single turbo upgrade soon!!!
i'm still dream'n who's gonna make it
a reality?
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      03-24-2011, 07:38 PM   #20
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Quote:
Originally Posted by Sniz View Post
I have never seen this engine in person

honestly what are we talking about here to put a larger turbo on it?

thats where the gains are apparently.
The only problem I see is that the turbo and exhaust manifold are welded together and the DV are mounted right next to the turbo. You would have to fabricate a new exhaust manifold. Other than that shouldn't be that hard...

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      03-24-2011, 07:43 PM   #21
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Originally Posted by shockin330i View Post
The only problem I see is that the turbo and exhaust manifold are welded together and the DV are mounted right next to the turbo. You would have to fabricate a new exhaust manifold. Other than that shouldn't be that hard...
imagine a GT30R BB turbo with custom manifold ...
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      03-24-2011, 07:45 PM   #22
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Quote:
Originally Posted by shockin330i View Post
The only problem I see is that the turbo and exhaust manifold are welded together and the DV are mounted right next to the turbo. You would have to fabricate a new exhaust manifold. Other than that shouldn't be that hard...

OMG LOOK at that little ass inlet!
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