BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i)
 





 

Post Reply
 
Thread Tools Search this Thread
      09-01-2010, 03:03 AM   #1
BerkTechnology
Lieutenant Colonel
 
BerkTechnology's Avatar
 
Drives: Fast
Join Date: May 2008
Location: Irvine, CA

Posts: 1,565
iTrader: (1)

Arrow An intimate look inside the world's fastest N54

There is an in depth article on the Berk Technology 135i Time Attack machine that has been terrorizing the import racers. Since the season is almost over it was time to unveil all of the speed secrets that makes the car so competitive. The car was built using many parts from many of the vendors here on E90post/1addicts. Here are a few shots. Have a look at the article it's a very good read!

http://www.motoiq.com/magazine_artic...onstrator.aspx



Berk Technology's BMW 135i Time Attack Demonstrator
Text and photos by Jeff Naeyaert
When Berk Technology set out to build a time attack car, their intent was not to build some sort of exotic open class killer; it was more to build a rolling test bed for their exhaust products and something that their high performance street customers could relate to. Thus it was decided that their efforts would evolve around building a car to compete in Redline Time Attack's Rear Wheel Drive Street Class. Street Class is something that Berk's customer base could identify with and would be a more powerful marketing statement.



An Alpine White 2008 BMW 135i with a 6-speed manual transmission was selected as a base vehicle as a large amount of Berk customers are owners of this car. The One Series' compact size, relatively light weight and twin-turbo six cylinder engine lend itself well to simple modifications and are easy to build into a competitive car.


The engine on the Berk 135i remains very stock with only simple bolt-ons. It delivers 379 whp and 402 lb/ft of torque over a wide powerband with all day reliability.



The Berk stainless exhaust trims an amazing 40 plus lbs off of the BMW's total weight as well as unlocks a bunch of power over the restrictive stock exhaust. Even the race version of the exhaust isn't that loud and lets the delicious sound of the 120 degree firing I-6 engine come through.
The 135's engine remains relatively stock. The restrictive stock exhaust has been totally replaced with a Berk system. Berk thinwall stainless 3" downpipes replace the heavy stock parts. The downpipes reduce backpressure to improve turbo spool and HP/TQ numbers. They feature a heat insulating internal ceramic coating normally found on piston crowns to keep exhaust velocity up and underhood temps in check. Berk midpipes and race series exhaust system are also used. The race version features two mufflers that are center mounted on the chassis. By keeping all of the weight low and in the center of the car the weight distribution is improved and the CG (center of gravity) of the car is lowered. The race system has no muffler behind the rear axle which again improves weight distribution and handling by eliminating the 30lb muffler that would otherwise be hanging out near the rear of the car.


The AFE cold air intake system frees up a bunch of power over the restrictive stock intake that was designed to quiet the intake roar.



The AR Design oil cooler is essential for any track driven turbo 1 series. 1 series BMWs run really high oil temps on the track and go into limp mode when the oil temp gets past a certain threshold. The AR design cooler uses quality AN fittings and hose.



The oil cooler lives in the driver's side bumper duct. It works in parallel with the OEM cooler on the other side.
The restrictive factory airbox was replaced by an AFE cold air intake using twin cone type filters. A Code 3 intercooler with a Spearco bar and plate core replaced the stock intercooler. The Code 3 part is much more effective being twice the size of the stock intercooler. It has better cooling and less pressure drop across the core. Engine management is handled using a stock factory ECU tuned with GIAC software. Fuel, spark and boost maps have been recalibrated for more power. An AEM water/methanol injection system is used to suppress detonation and to keep combustion temperatures in check. The One is notorious for super high oil temperatures sending it into limp mode. On the Berk car, oil temperatures are kept in check with a big AR Design oil cooler. A stock radiator was found to be adequate even under strenuous racing conditions. The engine pumps out 379 RWHP and 402 lb/ft of torque with conservative tuning and boost levels.


An AEM Water Methanol injection system is used to suppress any chances of detonation and to hold engine temps down. We have used the AEM system with a great deal of success on our own project cars and highly recommend it for any forced induction use to control detonation and temperature. The AEM nozzle is shown here, it is critical for the system's operation as it atomizes the fluid into a fine mist.



An HKS blow off valve and Evolution Racewerks charge pipe help protect from compressor surge on overrun.



KW camber plates have bearings to reduce flex and are easily adjustable for camber.



The KW Competition dampers are independently adjustable for compression as well as rebound damping and have stainless bodies for smooth non-stick operation of the spring perches.



The rear KWs are still adjustable for ride height and corner weight even though they have an independent spring. Having a separate spring takes bind off of the rear shock and makes for a smoother ride and less tire shock.
Suspension is critical for any track car and Berk uses KW Competition 2-way adjustable coilovers. The Competition 2 ways have independent adjustments of the compression and rebound damping and are calibrated a little more aggressively than KW's Clubsport or Variant III lines. Velocity Motorsports supplied the adjustable links to adjust rear camber and caster as well as spherical bearing equipped swaybar endlinks. OEM E92 M3 sway bars are used for increased stiffness along with M3 front lower control arms for more negative camber. Polyurethane bushings are used to reduce subframe to chassis compliance. 18X9.5" APEX ARC-8 wheels are used with Hankook's Street Class dominating RS-3 tires to grip the road tenaciously. The track width is adjusted with Macht Schnell spacers and long wheel studs. An OS Gikken super lock 1.5 way differential distributes power to the rear wheels through a shorter 3.46 gear ratio.


Velocity Motorsports make these adjustable links to adjust toe and camber. They have spherical bearings to eliminate squishy rubber.



Machined aluminum subframe bushings eliminate flex and increase the sensitivity to chassis adjustment.



M3 lower arms for the front suspension are longer and allow more negative camber to be adjusted into the suspension.



The choice of Rotora brakes over the excellent stock Brembo's is a head scratcher. Berk is in the process of switching to some uber trick Performance Friction brakes soon.

The brake system on any race car is important. The Berk car relies on Rotora six piston calipers and 355mm rotors for stopping. We cannot figure out why the team would remove the stock car's excellent Brembo six piston OEM calipers for what seems a downgrade but we will be helping them with a set of Performance Friction super brakes which you will see featured here in a few weeks! It should be no problem to match PFC's claim of .2 seconds a lap or your money back guarantee! The brakes are fitted with Carbotech brake pads using XP10 compound on the front and XP8 compound in the rear. Ti Speed brake pad shims are used to reduce heat transfer into the ATE Blue brake fluid. Agency Power braided steel brake lines are used.


The rear two piston stock BMW brakes are pretty good as is.



The front brakes have some serious ductwork going to them, needed for slowing the heavy car from high speeds.



Agency Power braided steel brake lines improve pedal feel.








The L-Con crafted roll cage has perfect craftmanship. Look at how the floor plates wrap around the frame rails.



The upper part of the hoop has sano corner reinforcements and flawless tig welding. A hand-formed aluminum panel replaces the heavy sunroof.



Sparco seats save lots of weight. Sparco harnesses protect the driver and occasional passenger. A quick release steering wheel makes entry and exit of the car easier.



Sparco steering wheel is quite ergonomic!



Berk's race team manager Bee makes sure the car looks as good as it runs before getting back out on track!
Louie Contreras of L-Con fabrication built a basic roll cage from DOM tubing for the car. Since this was a street class car, the stock interior had to be retained. It is quite difficult to cleanly integrate an effective cage with a full interior but L-Con did an amazing job. The cage improves safety and greatly improves chassis stiffness and handling. The interior also includes lightweight Sparco seats on Macht Schnell seat rails and 6-point harnesses. Switching to the Sparco seats trimmed 70 lbs from the car's total weight, nearly making up for the weight of the roll cage! A NRG steering wheel quick release and Sparco steering wheel round out the interior mods.


The V-Fiber air dam and the APR splitter make a lot of needed front downforce.



The 135i has good underbody aerodynamics. The car is nearly a flat bottom. This helps the splitter and diffuser's effectiveness. You can see the cool Berk exhaust very well from this underbody shot.
The exterior features a bunch of functional and tasteful mods. An APR GTC rear wing and rear diffuser provides downforce in the rear balanced by an APR front splitter. A V-Fiber front airdam and side skirts manage airflow around the car. A vented Seibon carbon hood sheds weight and helps the engine stay cool. A Seibon rear deck lid also trims weight from the car. APR carbon GT3 mirrors cut drag as a large percentage of a modern car's drag is actually caused by the mirrors.


The Seibon carbon hood has generous venting. This greatly helps engine cooling and helps improve the effectiveness of the splitter.



The APR rear wing provides tuneable downforce.
After a 2009 development season and with a new veteran driver Mike Bonanni, the Berk 135i entered the 2010 Redline Time Attack season with a roar securing enough points to just about clinch the 2010 season championship at this time. Below is the cars record in the 2010 season to date.
Buttonwillow 1st Place 1:58.839 **New Street Tire RWD Record
Las Vegas Motor Speedway 2nd Place 1:49.111
Auto Club Speedway 2nd Place 1:51.373
Willow Springs 3rd Place 1:30.415


The V-Fiber side skirts look good and somewhat help underbody aero by resisting the air's tendency to curl under the car.



The Seibon rear trunk decklid saves weight while the APR rear diffuser helps create downforce. ..and the Laura in the background does her best to distract photographers.


Despite its ontrack prowess, the Berk 135i is still quite streetable and would be a pretty decent street car, mild enough for comfortable daily driving! The car is a true statement that a fully streetable car can still easily be a winner in the hands of the right team.










BerkTechnology is offline  
0
Reply With Quote
      09-01-2010, 07:22 AM   #2
Black Sheep
A Zip an a Double Cup
 
Black Sheep's Avatar
 
Drives: 2009 BMW 135i
Join Date: Feb 2010
Location: McHenry, IL

Posts: 4,463
iTrader: (5)

bad ass.... Good Job kickin ass
__________________

PTF Tuned | RB's | AMS FMIC | AR DP's | HPF Exhaust | CP-E DCI | Apex Arc 8's | 235/275 Star Specs |
Black Sheep is offline   United_States
0
Reply With Quote
      09-01-2010, 07:40 AM   #3
dcho
Captain
 
Drives: SGM 135i
Join Date: Jul 2009
Location: Houston

Posts: 941
iTrader: (0)

eyeliner ftw!!!!
dcho is offline  
0
Reply With Quote
      09-01-2010, 11:23 AM   #4
esscolab
Brigadeer
 
esscolab's Avatar
 
Drives: Black 135i
Join Date: Mar 2008
Location: Colchester - UK

Posts: 728
iTrader: (0)

Suprised to see the AFE open intakes in there!!!
__________________
Eibach Sports springs, Evole Remap, Quafe LSD, AR Downpipes, Forge FMIC, Hart'ge Quads, BMS Intake.
esscolab is offline   United Kingdom
0
Reply With Quote
      09-01-2010, 11:32 AM   #5
oner
Second Lieutenant
 
oner's Avatar
 
Drives: BMW
Join Date: Jul 2009
Location: Earth

Posts: 214
iTrader: (0)

Im surprised theres no strut bar on a track machine like that.
oner is offline  
0
Reply With Quote
      09-01-2010, 11:34 AM   #6
SV Concepts III
Lieutenant General
 
Drives: BMW Duh
Join Date: Apr 2005
Location: Santa Clara

Posts: 17,022
iTrader: (13)

Send a message via AIM to SV Concepts III
Looks great guys, thanks for sharing
SV Concepts III is offline  
0
Reply With Quote
      09-01-2010, 11:45 AM   #7
oner
Second Lieutenant
 
oner's Avatar
 
Drives: BMW
Join Date: Jul 2009
Location: Earth

Posts: 214
iTrader: (0)

Wonder why berk decided to go with the Pro Dry AFE filter rather than the Oiled. Doesn't the oil provide better flow?
oner is offline  
0
Reply With Quote
      09-01-2010, 01:13 PM   #8
tom @ eas
Lieutenant General
 
tom @ eas's Avatar
 
Drives: BMW
Join Date: Nov 2005
Location: Anaheim, CA

Posts: 10,161
iTrader: (13)

Garage List
Great article, glad to be part of the team. Keep setting those track records!
__________________
tom @ eas is offline   United_States
0
Reply With Quote
      09-01-2010, 01:16 PM   #9
SlicktopTTZ
Captain
 
SlicktopTTZ's Avatar
 
Drives: 91 300ZX Twin-Turbo, 2010 135i
Join Date: Aug 2009
Location: Corpus Christi, Texas

Posts: 686
iTrader: (0)

Quote:
Originally Posted by oner View Post
Wonder why berk decided to go with the Pro Dry AFE filter rather than the Oiled. Doesn't the oil provide better flow?
Maybe they did not want to get any oil on a temp or MAP sensor?
SlicktopTTZ is offline   United_States
0
Reply With Quote
      09-01-2010, 02:40 PM   #10
BerkTechnology
Lieutenant Colonel
 
BerkTechnology's Avatar
 
Drives: Fast
Join Date: May 2008
Location: Irvine, CA

Posts: 1,565
iTrader: (1)

Quote:
Originally Posted by oner View Post
Wonder why berk decided to go with the Pro Dry AFE filter rather than the Oiled. Doesn't the oil provide better flow?
To be honest the only reason why we went with the AFE intake was that it was the only intake available at the time. In hindsight we should have kept the stock intake or used a simple DCI intake. On certain points the AFE is certainly worse than the OEM air box, on others the AFE might be marginally better.
BerkTechnology is offline  
0
Reply With Quote
      09-08-2010, 05:14 PM   #11
M3_WC
Colonel
 
Drives: M3
Join Date: Jun 2009
Location: CA

Posts: 2,216
iTrader: (0)

Glad to hear you are switching over to Performance Friction brakes. In my opinion one of best brake upgrades for the track, but pricey. Their name isn't out there as much, but damn their brakes are top shelf.
M3_WC is offline  
0
Reply With Quote
      09-08-2010, 05:24 PM   #12
Kinzer S13GT
Avid enthusiast... is to put lightly!!
 
Drives: Black Coupe
Join Date: Jul 2009
Location: Miami, FL

Posts: 44
iTrader: (0)

As filters go... oil is used as a filtering aid. It captures particles the cotton or other medium, cannot.
Kinzer S13GT is offline  
0
Reply With Quote
      09-08-2010, 05:30 PM   #13
Oulixes
Lieutenant Colonel
 
Oulixes's Avatar
 
Drives: 330xi, 335i
Join Date: Feb 2009
Location: Terra Borealis

Posts: 1,941
iTrader: (0)

Excellent writeup and visuals. Thanks, Berk.
Oulixes is offline  
0
Reply With Quote
      09-08-2010, 05:40 PM   #14
NYC6
Banned
 
Drives: '10 135i PPKI/06 C6 Z51 Vette
Join Date: Aug 2009
Location: LI/NY

Posts: 2,078
iTrader: (0)

What if any computer tweaking was done? Intake and exhaust changes wont give that much of a bump in power. Boost had to be raised. It mentions "conservative tuning" but I would like to know what that means.
Sure would love to see a dyno on this car.
NYC6 is offline   United_States
0
Reply With Quote
      09-08-2010, 05:41 PM   #15
spellbmw
Feuertrunken
 
spellbmw's Avatar
 
Drives: MY10 135i 6MT
Join Date: Jun 2009
Location: Oregon

Posts: 546
iTrader: (1)

Quote:
Originally Posted by Oulixes View Post
Excellent writeup and visuals. Thanks, Berk.
+1 - great job, guys!
__________________
Crimson-Coral Red |Walnut | iDrive | Premium & M Sport | Heated seats | PDC |CA | Premium hi-fi | BMW SSK & PE | BSH OCC -
Deposit 7/15/2009 - Ordered 9/18 - Production 9/23-30 - Euro Delivery 10/17 - Shipped 11/13 - Oxnard 12/8, Oregon 12/24 & home on 12/30
spellbmw is offline   United_States
0
Reply With Quote
      09-08-2010, 06:48 PM   #16
Kinzer S13GT
Avid enthusiast... is to put lightly!!
 
Drives: Black Coupe
Join Date: Jul 2009
Location: Miami, FL

Posts: 44
iTrader: (0)

...The struts are Braced, from the factory. There just isn't a cross bar between the shock towers. They tie at the bulkhead, besides the car is fully caged.
That HP figure is interesting. 3" Downpipes alone (especially in this engines setup) can free up 20hp, easy. I have seen it done on engines with less restrictive oem turbo outlets. This one wouldn't surprise me if it did the same. Although still... a 100hp +/- increase at the wheels (unless that's a typo) is impressive! Is this still running the OE intercooler... Obviously, It seems you went through a lot of effort to keep running temps low. Every 2 degree F, drop in temps = a 1% increase in HP!! (intake temp)

Its nice to see a car assembled with some serious thought process.... nice work! Its gotta be amazing to drive!

Last edited by Kinzer S13GT; 09-08-2010 at 06:54 PM.
Kinzer S13GT is offline  
0
Reply With Quote
      09-08-2010, 06:58 PM   #17
GOLFFRR
 
GOLFFRR's Avatar
 
Drives: Golf Cart
Join Date: Mar 2009
Location: Solvang, CA/Camarillo, CA

Posts: 15,719
iTrader: (4)

Seen this car in person sooo sick!
__________________

BEFORE YOU BUY YOUR NEXT BMW, EMAIL US FIRST WE CAN HOOK YOU UP!
Need a quote or assistance from David? GO HERE-->http://www.bimmerdavid.com/#!blank/c1r1e
Davids current ED Special M235/228--> http://www.2addicts.com/forums/showthread.php?t=1013211
GOLFFRR is offline  
0
Reply With Quote
      09-09-2010, 01:14 AM   #18
buckshizzo
First Lieutenant
 
buckshizzo's Avatar
 
Drives: '09 JB E92 335i
Join Date: Feb 2010
Location: SoCal

Posts: 303
iTrader: (4)

Very nice car. Well thought out.
buckshizzo is offline  
0
Reply With Quote
      09-09-2010, 06:25 AM   #19
cheese on fried toast
Enlisted Member
 
Drives: E39 2000
Join Date: Aug 2010
Location: sydney australia

Posts: 43
iTrader: (0)

great article, well documented and very intresting, good luck for the rest of the season
cheese on fried toast is offline  
0
Reply With Quote
      09-09-2010, 09:32 AM   #20
tgxmike
Second Lieutenant
 
tgxmike's Avatar
 
Drives: '09 128i Coupe, 6MT
Join Date: Feb 2010
Location: Boise, ID

Posts: 287
iTrader: (0)

Garage List
2009 128i  [0.00]
ummm..... pic of the rear suspension looks like the sway bar is way out of adjustment. the car is jacked up and the sway is still sticking up to high. If you put the car back on the ground the sway would be rotated almost to the top and provide little to no movement?????

Front sway looks ok.
tgxmike is offline   United_States
0
Reply With Quote
      09-09-2010, 09:38 AM   #21
Castr_85M
Captain
 
Castr_85M's Avatar
 
Drives: AW/Fox 6MT E90 M3
Join Date: Sep 2009
Location: NYC

Posts: 947
iTrader: (7)

Hats off to you guys
Castr_85M is offline  
0
Reply With Quote
      09-09-2010, 11:41 AM   #22
Berduderunner
drk one
 
Berduderunner's Avatar
 
Drives: 2008 135i
Join Date: Dec 2007
Location: Tampa/Orlando

Posts: 792
iTrader: (0)

Garage List
2008 e90 335i  [0.00]
2008 135i  [0.00]
Send a message via AIM to Berduderunner
Hell yea! Great read... go Berk!
__________________
Jet Black | Coral | HighGlossBlack | Steptronic | Premium | Sport | Comfort | ActiveSteering | Navi | HiFi | HD | iPod | SAT
BMS JB3 v2.0 | BMS DCI | Berk Tech Sport Exhaust | UR * DPs | CoolingMist Meth Kit w/ CMGS | H&R OE Sport Springs | Breyton GTS-R | Dunlop Direzza Sport Z1 Star Specs | GP Thunder 8000K Low Beams/Angel Eyes/Cornering Lights | LED Interior Light Kit | Window Tint | Smoked Tail Lights | Smoked License Plate Cover
Berduderunner is offline   United_States
0
Reply With Quote
Post Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -5. The time now is 04:09 AM.




1addicts
Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST