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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 > N55 | Berk Technology 4" Downpipes w/ DYNO



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      03-31-2011, 02:45 PM   #1
FrankiE90
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Thumbs up N55 | Berk Technology 4" Downpipes w/ DYNO

Downpipes, downpipes and downpipes for the N55.
Catless DP give you big gains.
How? because you're removing the 2 biggest restrictions - cat
number 1 and cat number 2, all in one shot.

Not for the faint at heart, but for pure performance enthusiast.
I love catless DP, the bimmer sounds and feels amazing!!!
Yes you will smell fumes if you're idle in one spot
with the windows down. My friend would complain when idle'n
at in-n-out, his nose is pretty sensitive - isn't that right PAK?

Driving, you just hear pure
performance and the with the Berk DP I'm getting a monsterous
sound and power throughout the powerband. No joke.

When approached by Berk, I had some reserves of a 4"
DP on the N55... Let me rephrase that and say that 4-6 months
ago I had a conversation with Bryan bout making a DP for the N55.
He said they're in the process and the wait began.
Time had lapse and a few DP came into the market.
It wasn't until recently that they we're ready to test fit one.
And when I got the phone call from Berk, I was very happy
to test their N55 DP.


Bryan over at Berk explain'd their fabrication
process and reasons for the welds and a 4"dp. There
are details, that i'll let Bryan chime in and explain. I
feel very confident with Berk, knowing they are a company
known for track'n. And with their proven 1er it was a no
brain'r for me. They beat the living chit out of that 1er.
And for good reasons.

They're quality control is amazing - all taken care
of in house in a mid sized warehouse located in Southern California.
A very humble company striving to make
a mark in the bmw community and they're doing a good
job at it.


BERK's 1er.




now
onto the picts and dyno.

the 4" DP - my e90 lifted and exposed unerneth
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Bryan took care of install'n the DP
and dyno'n at EAS.
Big Thank you to EAS with their new Dynojet.

Previous I had my 19 LMs on and had some
problems with my rear wheels. The stockers went back on.

SPECS:
335 N55
6MT
18 stock wheels
91 OCT pump gas
Vanguard Exhaust
Stock intake

DYNO BASE RUNS
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DYNO DP RUNS
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DYNO COMPARE
you can see the runs compare stock to BERK's DP
power throughout the bandwidth and you feel it.

if u don't know how to butt dyno - you'll know it with this
mod.
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just hightlight'd the gains throughout the curve.
DYNO COMPARE 2
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At the end of the day i'm very happy with my current setup.
I add'd the INJEN Intake back on and been running with that
setup and love it. I may keep my stockers on for awhile.
The performance gains are amazing - Well worth the price
for HP gains, very torque'e and great, great sound.


It's night and day with the cats off.
I have no reserves against Berk's 4" downpipe.
Guys i'm a happy camper.
It's been about a week that I've had it, and it's
consistent - i luv going wot on 2nd, and 3rd, and 4th, and 5th.
power throughout.

To mention, yes you'll get a SES light - that's a given.
if u got software you can turn that off. Can tool, Procede.
No spacers were used, or will be for the O2 sensors.

i'm happy with this setup.
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Last edited by FrankiE90; 03-31-2011 at 06:12 PM.
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      03-31-2011, 02:50 PM   #2
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Dude, thank you for posting. Can you please throw up a video of engine sound with intake & DP? To my knowledge, nobody has yet and I bet it sounds like a beast..
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      03-31-2011, 02:57 PM   #3
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Nice Frankie! 4" sounds the way to go !
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      03-31-2011, 02:59 PM   #4
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Interesting... and congrats on ur setup! I do love my catless setup as well. I'm intrigued at the TQ numbers though, it still seems as though the 3.5 eeks out more TQ. I know where only talking 9-10 ft lbs, but... still interesting. I believe the Vishnu max's out at 307 lbs (against stock) but it 4hp shy of the Berk (against stock)

Ref: http://www.e90post.com/forums/showth...ight=vishnu+dp

Either way, IMO, it's a fantastic mod. I'm real curious about ar's new catted dp... if that posts similar numbers to the catless versions out now, I may switch.
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      03-31-2011, 03:01 PM   #5
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We'll need the obligatory cold start up vid
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      03-31-2011, 03:04 PM   #6
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Quote:
Originally Posted by lpphreakx06 View Post
We'll need the obligatory cold start up vid
you know it.....
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      03-31-2011, 03:14 PM   #7
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hey sorry for the newb question but i have a 335xi n55 and am currently running a jb3 on it with a drop in filter. I was interested in getting a DP for it but i just have a question concerning the SES light. I have the CAN tool (which i haven't used yet), would i have to clear codes with it every time i start the car up? or once cleared always cleared?
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      03-31-2011, 03:15 PM   #8
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Those gains seem small. I thought you got more power from the n55 with a catless downpipe
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      03-31-2011, 03:15 PM   #9
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u know i'm making a video.
that cold start is gnarly.

i'm just happy to have a catless DP.
i was feel'n sad and left out for awhile.

i'm tell'n u remove those cats and
amazing happens. If the smell gets to me,
which it hasn't, i'll simply get a used N54 exhaust
and slap that on - it has a set of cats on it.
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      03-31-2011, 03:29 PM   #10
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Quote:
Originally Posted by Cuffss View Post
hey sorry for the newb question but i have a 335xi n55 and am currently running a jb3 on it with a drop in filter. I was interested in getting a DP for it but i just have a question concerning the SES light. I have the CAN tool (which i haven't used yet), would i have to clear codes with it every time i start the car up? or once cleared always cleared?
it should auto clear exhaust codes (BMS CanTool) - just leave it plugged in and tuck it away
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      03-31-2011, 03:36 PM   #11
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damn that's some nice gains Frankie. Good stuff!
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      03-31-2011, 04:11 PM   #12
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Quote:
Originally Posted by madmanhiker View Post
it should auto clear exhaust codes (BMS CanTool) - just leave it plugged in and tuck it away
good shit thanks man
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      03-31-2011, 04:30 PM   #13
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Quote:
Originally Posted by Cuffss View Post
hey sorry for the newb question but i have a 335xi n55 and am currently running a jb3 on it with a drop in filter. I was interested in getting a DP for it but i just have a question concerning the SES light. I have the CAN tool (which i haven't used yet), would i have to clear codes with it every time i start the car up? or once cleared always cleared?
from what i hear, it should self clear with the Can tool.
there's a setting. Once it's set it always clears.

Quote:
Originally Posted by Brey335i View Post
Those gains seem small. I thought you got more power from the n55 with a catless downpipe
what gains were you think'n of?
these look like solid numbers to me.
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      03-31-2011, 05:15 PM   #14
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Very nice Frankie! Subscribed for the vid
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      03-31-2011, 05:16 PM   #15
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Quote:
Originally Posted by madmanhiker View Post
Interesting... and congrats on ur setup! I do love my catless setup as well. I'm intrigued at the TQ numbers though, it still seems as though the 3.5 eeks out more TQ. I know where only talking 9-10 ft lbs, but... still interesting. I believe the Vishnu max's out at 307 lbs (against stock) but it 4hp shy of the Berk (against stock)

Ref: http://www.e90post.com/forums/showth...ight=vishnu+dp

Either way, IMO, it's a fantastic mod. I'm real curious about ar's new catted dp... if that posts similar numbers to the catless versions out now, I may switch.

put aside the end numbers on the dynos
look at the curve and the in betweens.
the torque numbers maybe higher but look at the curve
where it spikes to that end number.

like u said, love catless dp- and i'm on the same boat.
different dynos will yield different numbers.
even between dynojets.

look'n at the numbers from base to mod'd,
on the same dyno
will tell you the gains.
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Last edited by FrankiE90; 03-31-2011 at 05:23 PM.
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      03-31-2011, 05:35 PM   #16
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Amazing as always frankie ... now get yourself a procede and really see a power increase !!
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      03-31-2011, 05:58 PM   #17
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Thanks Frankie for the dyno and the write up on the Berk Technology DP. For this to be real test of DP gain we need a true dyno chart of just a PURE STOCK car. Then one with a PURE STOCK car + Berk DP.... The dyno shows gains with an exhaust on the car which in my opinion should make more horsepower then shown?

My car made a litte less HP, more TQ but with no exhaust...just some food for thought.

See if you can re dyno with just the DP only runs...
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      03-31-2011, 06:01 PM   #18
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Very nice!
Good info Frankie!
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      03-31-2011, 06:12 PM   #19
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Quote:
Originally Posted by RyanMv4 View Post
Amazing as always frankie ... now get yourself a procede and really see a power increase !!
that's the plan.
1 mod at a time.

Quote:
Originally Posted by htt760 View Post
Thanks Frankie for the dyno and the write up on the Berk Technology DP. For this to be real test of DP gain we need a true dyno chart of just a PURE STOCK car. Then one with a PURE STOCK car + Berk DP.... The dyno shows gains with an exhaust on the car which in my opinion should make more horsepower then shown?

My car made a litte less HP, more TQ but with no exhaust...just some food for thought.

See if you can re dyno with just the DP only runs...
you would think that the exhaust would make more horsepower.
remember the stock exhaust on the n55 are catless - so no restrictions.
the Vanguard does have a resonator. I believe the exhaust
has minimal gains if any, just add'd sound.

I understand stack'n power mods and dyno'n.
that's why berk dyno'd with the exhaust on as base and
then their DP.

If and when i have time i'll swap back to stock exhaust
and dyno just to see. I need to go back to EAS
and dyno with the INJEN intake anyways.

htt760, end of day cat'd dp restrict lots of power.
and whatever dp u get it's going clear and open
the passage way.

is ur bimmer dct?
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      03-31-2011, 06:34 PM   #20
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Unless you have an xdrive... Secondary cats galore!
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      03-31-2011, 07:18 PM   #21
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Money well spent!! almost 20/20 gain just from dp!? Man! PROceed that chit asap! I love SES lights! I feel weird without it now!
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      03-31-2011, 08:02 PM   #22
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Quote:
Originally Posted by Sloppy View Post
Unless you have an xdrive... Secondary cats galore!
absolutely correct -
not to forgot my XI brother.


-u know i wonder if an XI downpipe will go into the I.
isn't the XI single cat on the DP, sloppy.
if that's the case...



Quote:
Originally Posted by creaminz View Post
Money well spent!! almost 20/20 gain just from dp!? Man! PROceed that chit asap! I love SES lights! I feel weird without it now!
look throughout the curve -
on the compare dyno chart 2.
if u calculate it's 15/22 @ 3.6rpm, 21/25 @ 4.4rpm, 21/26 @ 6.5rpm.


i just put electric tape over the ses light.
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