The Murderous Motor: A 931bhp Bmw E30 Turbo

I’m going to tell you something that you might find hard to swallow. This isn’t actually a car. It may have all the characteristics of an automobile: headlights, four wheels, doors and stuff, but this is not a car. What is it? It’s a WMD. A Weapon of Mass Destruction.

You may think that the words you have just read are pure unadulterated sensationalism, but they’re not. I can assure you that I type the truth.

Look into its multiple eyes and you will find yourself staring into the soul of an attempted murderer. Karel Silha, owner and builder of this Bavarian monster, was its first victim. Fortunately, he lived to tell the tale. But things didn’t end there, though. Oh no. After this, the BMW went on to commit slaughterous acts of the mechanical kind.

To be specific it’s not actually the body that’s the killer – it’s the BMW’s heart that needs to be carefully watched. You see, the 6-cylinder M20 motor is dangerously violent. But, like a compassionate father, Karel has forgiven this powerful beast, looked past its sins, and continued to develop it. Has he created a monster? Yes, I think it’s pretty fair to say that he has.

Venturing closer it’s clear that this BMW is not normal – it’s wild and it definitely requires respect. Actually, this BMW doesn’t require respect, it demands it. Don’t let the four-door guise put you at ease. The hideously powerful 931bhp engine has already claimed the life of one E30 body shell. That was a two-door version and it was the first taste of slaughter for the then M20/M21 hybrid lump.

Before we explore this lunatic power plant, which delivers nine-second performance on the drag strip, I’d like to talk about the body. Or the second body that this motor now lives inside. Eagle-eyed BMW aficionados may have already spotted the widened rear end.

Whether you called the manipulation of arches and rear doors already or not, I can tell you that this ‘boot-cut’ set-up is most definitely purposeful and extremely raw. So why all this talk of killing and destruction? Well, quite simply, this second body shell is the result of the motor’s throttle body sticking open and destroying the two-door shell. Things didn’t stop there, though. The crazed M20 tried to take Karel to the grave along with the original shell. The WMD E30 motor was almost responsible for the death of its owner! It definitely means business and not a lot else.

This build is a perfect example of things starting simple and quickly getting out of control. Take a look at this photograph. The light in Sweden at this time of year is really quite unique. ‘Golden hour’ doesn’t seem to exist, it’s more a kind of ‘golden evening’ where this beautiful light lasts for hours. It perseveres. This is an altogether lovely happening. And what I’m beginning to realise is that the Swedish approach to automotive building is much like this long-lasting golden light. There’s no fast sundown and no throwing in the towel after one box has been ticked. The Swedish builds I have seen so far are steadfast.

Karel is not really sure why he chose an E30 to work with. Although, in his mind, the E30 M3 is the most beautiful car BMW has ever made, so perhaps that swayed his decision. Despite this love for the M3, though, Karel was very determined not to build a replica. The objective was to widen the body to make the build personal to him. But at the same time it needed to be subtle. He’s also of the thinking that if it’s not an M3 model, it’s best to avoid M3 parts if possible. The goal was to be able to fit 10-inch or even 11-inch wide wheels clad in drag slicks at the rear, while keeping as much of the original E30 shape as possible. I think Karel and his friend Tobias, who played a big hand in the bodywork, have done a really cool job. The build is very unique and honest.

The wider arches, or fenders as Karel calls them, is quite the norm in Sweden. Instead of using M3 fenders Karel and Tobias cut around and underneath the wheel housing to pull the arches out. Then sheet metal is used to bridge the gap and create this subtle, but very purposeful, wide body E30. The cool thing is the OEM look is pretty much retained. I was underneath the car checking everything out when Karel explained that although the rear is commonly widened, the front is often ignored. Tobias insisted that they give the front arches some more girth too. The result is a rear that’s over 60mm wider, whilst up-front things are approximately 30mm more accommodating. I really love the fact that not that many people will notice this arch work until it’s pointed out to them. It’s these cool modifications, that draw you in without really knowing why, that make me smile.

Karel has showed diligence and tenacity to get his project to its current place and there’s no sign of relent.

I love the truly hands-on approach that seems rife in Scandinavia. People just love to get stuck in and work on their cars. Maybe it’s the long winters? Of course car building is prevalent the world over, but when you ask a Swedish guy who built their car they kind of give you this questionable look as if to say, ‘well, me and my friends, of course… Who else?’ Before they politely answer and say, “me and my friends!”

It’s almost as if getting anyone else to build a car for them is a bit crazy. If you want it done, then borrow some tools, get some friends together, and make it happen seems to be the way for the people I have met so far in Sweden.

Karel was quick to thank his friend Johnny for the custom fabrication. The use of the workshop that belongs to Johnny’s father was invaluable.

The third guy that helped out was his friend Douglas or ‘Dogge’ as he’s know. He’s also Karel’s garage mate who has helped with pretty much everything on the car – the wiring, gearbox modifications, engine build and lots more. The main man when it comes to motor work is Stefan who carried out the machine work to the engine parts. Pretty much all of the building has been done by Karel and Dogge.

It’s at this point that I guess you’re going to start questioning the wheels. “Nine-second passes”, you say. “On those wheels?” Keep calm, because this is also built for the street. It’s a sort of hybrid machine. Not in an environmentally-friendly kind of Toyota Prius-type of way, but I think that’s pretty clear.

Karel has built this to be a drag weapon and a road-legal track machine that’s fully useable on the road. Most importantly the E30 has been built with fun in mind. But when proper times need to be put down, this E30 wears Hoosier drag slick and 15-inch wheels.

Everything about the BMW for me says raw and ready for action…

… the switchgear has been replaced with on/off toggles that say cool stuff like ‘linelock’ and there’s a button labeled for ignition. Anything that requires its engine to be started using a button is 100 percent good, right?

Aggression. Aggression seems to be a keen theme with the Swedish builds that I have encountered so far. These guys love a hydraulic handbrake! This car has been built to slide as well as go in a straight line and I love this jack-of-all-trades approach.

Another thing I absolutely love is digital dash displays. I remember getting a lift with my dad’s friend in his Mk1 Vauxhall Astra GTE and it had a digital dash. I felt like I was suddenly in an episode of Knight Rider. I guess in a childish way I will pretty much always celebrate a car that has a digital dash. Anyway, when this car gets unleashed at Gatebil it sure would be cool to be in the passenger seat watching that Haltech display go mental!

And so to the motor. On the face of it, this is an ’80s engine, but the innards are a hybrid of BMW parts which work together to create a demonic behemoth! It all started back in 2006 when Karel got the idea to build a fun racer to go sideways with. The first year things were kept simple with stock pistons and rods and a huge turbo from a truck. This lasted during the summer of 2007, but soon the gasket blew and the plan was to just replace it.

But that didn’t happen. During that time Karel was sharing a garage with his friend Ivars (who himself brought a 1.000hp+ M5 along to the shoot). At that time Ivars bought a E30 Touring and things became competitive. Soon both Karel and Ivars we buying all sorts of performance parts. Pistons, rods, brakes, cam, valves, Haltech ECU and a stroker crank from an M21 diesel engine were all gathered. Karel’s car got a fresh paint job in NATO Military Green and it started to look quite special. The turbo remained the same as the original build, but with the right parts now installed and the motor out to 2.7 litres, the result was 734bhp and an incredible 690lb/ft of torque at the crank. This was now serious.

This set-up remained until 2011 and during this time the BMW laid down a 9.6-second ET on the 1/4-mile time after just three attempts. Lots of fun was had at Gatebil events, too. The E30 was used and enjoyed to its full potential by Karel.

During 2011 the car was put back on the dyno again and the engine was redeveloped with a new turbo, bigger injectors and better fuel system. The motor was also further stroked to 2.85-litres with a compression ratio of around 9.0:1 which is maybe a little higher than the norm.

It was during the first run with this mega engine spec, that the aforementioned throttle body ‘incident’ took place. The two-door E30 left the road and was never recovered. Karel did recover, fortunately, and went back to the drawing board. For him, quitting was never an option. The new shell you see here was sourced, the innovative arch work and door manipulation executed, and the body painted in a Lamborghini hue. The motor got some more attention, too. Finally, after many troubles with cracked heads and worn rocker challenges, the engine saw some proper dyno tuning. The result? 931bhp and 825lb/ft of torque.

These figures were achieved on E85 fuel. Pretty impressive, right? Well surprisingly not for Karel. In fact he was really disappointed as the goal was to make 1050bhp. I think this is the first time I have ever met someone who is disappointed with their 931bhp BMW E30! Sticking to his ‘quitting is not an option’ philosophy, Karel is going to spend some more time at the dyno later this year, determined to achieve his 1000-plus horsepower dream!

With that kind of power a parachute is most definitely wise for the drag strip! Karel is on an epic journey with this WMD Bavarian power plant and he’s not done yet. The plan is to keep developing the blown M20 until eight-second passes are achieved and an insane 1050bhp figure has been met. This 12-valve, single camshaft, turbocharged motor has been a seven-year love affair and it’s pretty exciting to see such dedication to an engine that’s clearly crazed.

When you consider the pure carnage the motor nestling in the four-door E30 shell could have unleashed, then ‘dedication’ is certainly not a word that’s used lightly on this occasion. This BMW might have failed in murdering its owner, but who says you have to die to be in heaven?

Words by Ben Chandler
Twitter: @Ben_SceneMedia
Instagram: @ben_scenemedia

Photos by Paddy McGrath
Twitter: @PaddyMcGrathSH
Instagram: speedhunters_paddy
paddy@dev.speedhunters.com

Karel Silha’s E30 BMW Wide Body Turbo

Numbers
Max power: 931bhp, max torque: 825lb/ft, best ET: 9.6 seconds

Engine
BMW M20b25 engine block stroked to 2.85L, custom Ross pistons with 9:0 compression ratio, aftermarket rods, 1680cc injectors running at 4-bar  base pressure, Haltech PS200 ECU, Precision turbo 71mm, custom made exhaust manifold by Robbz, PPF stage 3 valve springs, PPF 1mm oversize valves, Catcams Custom CAM, KSR.NO rockers, custom made thread and locking function for the original gasket (running 3.2 bar of boost), front mount intercooler, removed original water pump and replaced with an electric one,  Weldon 2345 fuel pump, Weldon a2047 regulator, Weldon an12 filters, Weldon 14000 pump controller, MSD 8245 coils, custom made sequential ignition system, TiAL 50mm blow-off valve, Precision 66mm wastegate

Driveline
BMW gearbox, custom propeller shaft by Sveabil, M535 driveshaft knots, custom driveshafts, Alpina B7 Turbo rear diff, Sachs 765 pressure plate, sinted clutch, M535 flywheel.

Suspension/Brakes
FK coil-overs (front), AVO coil-overs (rear), Locobrx with six-pistons calipers from Bakaxeldelar

Wheels
Zito XLS 19×8.5-inch (front), 19×9.5-inch (rear)

Exterior
M-tech front and rear skirts, 6-7cm wider fenders at the back, 3cm wider at the front, carbon hood & trunk, custom made drag race wing

Interior
Sparco circuit race seats, Sparco six-point harnesses, modified full roll cage

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75 comments
fauzijurdi69
fauzijurdi69

E30 pride this car makes me very happy when I saw this gives me hope for my 89 4dr 325i true beauty

pmhkitchen
pmhkitchen

I wonder if he has overheating problems on the street?

Mike Russian
Mike Russian

Everytime I see another E30 that went under the knife and was reborn as a weapon of power and pleasure for some proud owner/builder and our viewing pleasure I'm reminded with the fun people we have in the automotive universe. I do keep a chevy engined e30 closer to my heart from most other cars. great job Karel

marcodannii
marcodannii

Great article and pics. Can anyone tell me what colour is that please?

zsellard
zsellard

Are there any vids of this car either on the strip or getting sideways around a track? After reading all this I would love to see the thing in action!

Dawsaurus
Dawsaurus

Mad car, love the rear wing. Those tyres would be pretty much useless though right. Sidewalls would be so stiff any sort of hard launch would be next to impossible and once boots hits - let alone at 150mph. Would do donuts in abundance  - needs some fat rubber underneath it!

Charles Montgomery III
Charles Montgomery III

Is a 75 shot of nitrous being considered to make at least 1006 bhp? Maybe different fuel? - C16 or Methanol?

senbilcock
senbilcock

Great feature! Love the photos. 

Husa
Husa

I live in the Nordic countries too (Finland), and as far as I understand we don't really give respect to people/cars that are built by tuners or some 3rd parties.It's not your car unless you build it yourself! It's okay to do something with professionals of course, but I really don't understand the build culture in US where you just give a crapload of money and preferably a shopping list to some garage. Atleast that's how I see it.

roryfjohnston
roryfjohnston

Is anyone gonna jump on the horrendous, horrible, insane, stupid, moronic, and incorrect install of the harnesses?Or do people only do that for the Japanese tuned cars?

LukeHuxham
LukeHuxham

Great photos, very hard article to read.

illhavethetuna
illhavethetuna

this car would be perfect if it had a stage 5 turbo and a motec systems exhaust

Grand Sport
Grand Sport

Awesome car. Very refreshing to see given all the talk in the industry lately about "stance" and all other trending ridiculousness. Good to know there are still guys out there building cars solely for the purpose of going fast and to hell with the rest of it. My kind of build, beautiful car. 

Adrian Senna
Adrian Senna

An E30 feature was so needed! and then you come up with this! Huge Thanks! right now l've been looking for a decent 2 door E30, been looking on ebay and r3v limited, but still waiting for my shot, if you have any advice l'd appreciate it!

 

 

 

maxproof
maxproof

I love the E30 and the M20 is a beautiful engine even in stock guise. Like a turbine, no vibrations, rising torques, nice sound ... great. At best in a convertible. But this one here is just mental! Awesome build but although everything's one brand this E30 is sort of a Frankenstein. If you want performance this video shows the perfect E30:http://www.youtube.com/watch?v=FeY1gOpntYc 

sofried
sofried

this is a very cool car but i honestly couldn't finish reading the article. yeah we get it, its a savage car with a lot of power, any car enthusiast will realize that immediately after reading "981bhp" i usually really enjoy your posts paddy, and please don't take offense to this, but i really hate the over embellished writing going on here. reads like a high school creative writing project tbh and you're clearly beyond that.

Ben Chandler
Ben Chandler

 @Dawsaurus It's mentioned in the story, but Karel runs 15-inch wheels with Hoosier drag slicks for the 1/4 mile. Rear wind is awesome! :)

Grand Sport
Grand Sport

Some people have the money, but not the time and just want a badass car. It takes a lot of time, blood, sweat and effort to build a really nice car. Others may think a builder has more skill than them. It's not very difficult once you learn, but if you make a mistake in a build you can blow a motor or kill yourself if you don't know what you're doing and make something unsafe. 

 

Just my thoughts on it. 

 

I would hardly say that is "US" culture as the shop I worked for that built 1000 + hp cars had a ton of clients from Australia, Norway and other European countries. Not really a US thing, just a rich guy thing I think. 

Karel021
Karel021

@roryfjohnston Whats so stupid about it ?

JeremyPhipps
JeremyPhipps

I think you posted on the wrong article.  The Hondas are over there  ----->

RodChong
RodChong moderator

@Grand Sport we agree!

Baljit Singh
Baljit Singh

 @Adrian Senna Depending on were you are in the world, I suggest you register with Bimmerforums, E30tech or E30zone =]

Grand Sport
Grand Sport

Funny I thought the exact opposite. With cars like this you get excited, I've been in 1500hp cars before and the way this was written I could sense the "wow" factor and the childishness that these cars make a person feel. Truly thats why people should build things like this. If you get a ride in a 1000hp car and you come away writing like a harvard graduate you're missing the whole point. 

 

Nice write up and I think a majority of the guys putting the car down or the story have either never been in a car like this, never driven a car like this, or lack souls like normal petrol headed humans. 

 

Good story Ben. 

Ben Chandler
Ben Chandler

I wrote the story, not Paddy. He took the photos though. Hope you liked the photos at least! Haha! 

zsellard
zsellard

 @Karel021  @zsellard 

Awesome, thank you for sharing that. And if there are any further track days in the future I'd love to see those too. Keep it goin man!

Ben Chandler
Ben Chandler

I think there are plenty of people from plenty of countries paying to have their cars built by shops, It's not fair to single the US out. Personally, I don't have a problem with it. As long as you're enjoying cars, that's what it's all about as far as I'm concerned. Having fun is the most important thing in general. However, so far, the people I have come across in Sweden, all seem to be up for getting stuck in. I'm sure that's not the case across the board, but there's definitely a cool attitude to car culture in Sweden. I really like the passion the people have over there. 

Husa
Husa

Could be, everyone does things their way. I can't really be a hater as long as people love their cars. Even the worst (insert your most hated style, be it slammed or tuning or whatever) builds might be done with love.And now that I think about it, I believe that if you design the build yourself I have to give some respect. It's just that I don't see a point in building a custom car with money. It's all about making it yourself and learning from all those stupid mistakes. :)If I'd want a cool car to show off, I'd buy an exotic.

Hanma
Hanma

@Karel021@roryfjohnston

A lot of "experts" lose their sh*t whenever they see harnesses that are mounted below the openings in the seat. Just an excuse to make a problem out of nothing if you ask me. Especially since there's no way in hell anyone's shoulders are going to be above the openings in those seats anyway, which makes this a non issue.

 

Or at least that's what I'm assuming he's referring to

 

Also curious since when is a German car built by Swedes considered a Japanese tuned car? lol

RodChong
RodChong moderator

@w @LukeHuxham Ben was on staff at Redline and Fast Car for several years BTW. I'm just saying :)

Grand Sport
Grand Sport

 @RodChong  @Grand Hey Rod! Cool to hear SOMEONE agrees with me on these forums hahaha. Enjoyed the write up and the photos as always. 

Adrian Senna
Adrian Senna

 @Baljit Singh Thanks! l forgot to say l'm in Mexico, and l plan on buying my E30 in the US... lve seen some very cool and well preserved e30's on ebay but they go up to 7000 and more, and l cant afford that much... l'll keep on checking, thanks! By the way M20 is such a nice sounding engine!

 

Taryn Croucher
Taryn Croucher

 @Ben Chandler I feel the opposite, I'm envious of your writing style Ben! I'm loving these joint features with Paddy! 

Grand Sport
Grand Sport

I see where you're coming from. Speaking for myself, I don't entirely enjoy wrenching I would much rather be out driving a machine than fixing it or working on it. If I had enough money I would probably be one of the guys to draft up an image and pay someone to build, however, I do enjoy building engines and the precision measuring that goes on in a motor. 

 

I've built a 350 chevy engine, a 125cc 2 stroke, and assembled Jericho and automatic transmissions. For me it's really just a time thing. What kills me is when I read about a guy building an Ultima GTR or something like that and it takes him 2 or 4 years to complete the project. I'd rather be out driving. 

KenBlockIsBeaker
KenBlockIsBeaker

@Hanma @roryfjohnston Actually, these harnesses were installed correctly in the eyes of safety and nearly all sanctioning bodies. FIA Safety Equipment Regulations Article 6: Safety Belts Section 6.2: Installation: The height of this reinforcement (referring to the tubing) must be such that the shoulder straps, towards the rear, are directed downward with an angle of between 10° and 45° to the horizontal from the rim of the backrest, an angle of 10° being recommended. Perhaps you should learn a thing or two before making "horrendous, horrible, insane, stupid, moronic, and incorrect" comments. It has nothing to do with the harnesses being "below" the opening in the seat, and has everything to do with the angle of the harness. This looks to be, as stated, about 15* from horizontal and attached using the correct and prefered method of wrapping around structural tubing. What you DO NOT see here is the harness attached using bendable brackets or attached to the rear floor/seatbottom as some do... @Karel021 - Awesome car. Hats off to you sir.

Karel021
Karel021

@Hanma @roryfjohnston What I of course meant was that when the rolecage was made the regulation was followed :)

roryfjohnston
roryfjohnston

 @Hanma  @Karel021 Yes, that is what I am referring to.  In regards to my "Japanese tuned car" comment, I meant that it seems that people always loose their sh*t when this happens on a car out of Japan.  As if the Japanese tuners are all a**hats.  I think it is just fine Karel.  I was being sarcastic.  Keep up the good work!

Karel021
Karel021

@Hanma @roryfjohnston Okay. Well its done by the book, not sure exactly what it says, but some 15 degrees is approved. Anyway if its wrong when get to the track is a easy fix :)

FunctionFirst
FunctionFirst

Bullsh*t, no one likes the tuna here. Go get yourself a fat burger and fries for 5.95.


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