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Guest Message by DevFuse
 

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74 VW Super Beetle with Subaru swap

VW subaru swap conversion turbo custom fabrication bugaru 1.8l Mpfi

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26 replies to this topic

#1 Oregon Bugaru

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Posted 13 August 2013 - 11:18 PM

Picked up this straight body 74 Super Beetle a couple years back for the bugaru project.

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#2 Oregon Bugaru

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Posted 13 August 2013 - 11:19 PM

Didn't come with a motor but that was fine with me as I had other plans for the boot.

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#3 Oregon Bugaru

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Posted 13 August 2013 - 11:32 PM

First step in the fab up I chose to start with was fitting a Radiator up front. I chose to put it in the bonnet because of the cooling gains achieved from the distance the coolant flows. And the air flow across the radiator at the front of the car with the assist of two 10inch fans will prove better than mid mount or above engine mount. I fabbed up an enclosure that will direct the super heated air back down to the road so it wont heat the fuel tank.

I went with a top to bottom flow radiator from a small V6.
Two 10" 12vdc fans and shrouds from a subaru loyal.
Frame fabbed up with 3/16" flat bar.
Enclosure fabbed from 20 gauge sheet metal.
Top of enclosure is held on and removable via tapped 8mm bolts.

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#4 Oregon Bugaru

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Posted 13 August 2013 - 11:39 PM

Since this is a restoration too replacing some bad rust was a must.

Separated body from chassis.
Drilled out spot welds with 10mm spot weld drill bit.
Removed the troublesome welds with the trusty grinder.
Cleaned up surfaces and sanded the edges of the new floor pan.
Got the new floor plan from Brooks auto parts in eugene.
Spot welded into place.

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#5 Oregon Bugaru

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Posted 13 August 2013 - 11:50 PM

My power plant is a 1.8L mpfi turbo flat 4. Engine came from japan import with approx 40k miles.

Conversion kit and stage 1 clutch kit came from Kennedy Engineered Products out of California. This was built to order, so waiting time was about 4 weeks from order to my mailbox.

They make all sorts of adaptor kits for subaru to VW conversions.

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#6 Oregon Bugaru

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Posted 13 August 2013 - 11:56 PM

The point of no return!!! This is one step that makes the fit up soooooo much easier! Just trim off the tail and it's possible to roll the engine up and back out while doing the fit up. Unless you have the access to a vehicle lift where it's very easy to lift the vehicle up and down, this step saves a lot of frakkery. Its a simple fix to weld it back into place and finish.

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#7 Oregon Bugaru

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Posted 14 August 2013 - 12:08 AM

Based on the power of the engine I opted to stay with the type 1 VW transmission. There are a couple of mods that will get done to the internals (stay tuned for those updates later) which will make it bullet proof.

With several attempts it finally fit in and bolted up just fine. I had to cut out some metal where the back seat was beneath the rear window because the downpipe and intake manifold were hitting and not letting things mate up.

This also allows room to build a heat shield around the turbo and downpipe so it wont boil the body and the electrics that will be stuffed into the rear of the car.

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#8 Oregon Bugaru

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Posted 14 August 2013 - 12:14 AM

So after months and months of not doing any work on the bugaru and not having funds to work on the body and suspension, Im in the process of thinning out the wiring harness to just critical engine wiring. Since this material was on hand and needed to be done sooner or later i figured i might as well knock it out.

The wiring harness is complete from the subaru gl that the engine came from. Im trimming down to just ignition, injection, and sensors for the ECU. And keeping anything that would otherwise hinder the engine from starting without.

If anyone knows online resources for the diagrams for this model car (86 suba gl sedan turbo 1.8L mpfi) it would save me a great deal of time. Thanks!!!

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#9 O.C.D.

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Posted 14 August 2013 - 08:00 AM

Wow, cool project!!!  That thing is gonna scoot along nicely.



#10 Oregon Bugaru

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Posted 14 August 2013 - 01:36 PM

Thanks man! It's been a long dream coming. I've always owned Subarus my whole driving career. They're super reliable and have never let me down. So my thought is why not take out the most unreliable part of the super cool Super Beetle and make the car run like a champ. Tge bug is less than half the weight of what the GL that the engine was pulling around previously.

#11 AKghandi

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Posted 14 August 2013 - 02:41 PM

That thing should be awwsome

#12 1982gl4

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Posted 14 August 2013 - 08:43 PM

Hello from a classic VW owner (71 super vert, and a 71 westy) Man this thing should crank when it is done. Very cool project. The air cooled's seem to go well with Subaru engines. My dad has a 914 with a EJ25 DOHC, it's amazing. It's fast, fits well, gets great mpg, and it's not broken down every five seconds! Looking forward to seeing this up and going  :headbang:



#13 soobenthusiast

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Posted 14 August 2013 - 09:53 PM

This is pretty cool!

 

What are you doing to deal with the extra weight in the back? I've been wanting to build another Type IV and put it in a bug, but the extra weight seems to require a rear engine mount.



#14 Oregon Bugaru

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Posted 14 August 2013 - 10:36 PM

This is pretty cool!
 
What are you doing to deal with the extra weight in the back? I've been wanting to build another Type IV and put it in a bug, but the extra weight seems to require a rear engine mount.


Great question! The VW 1600 cc engine was steel and weighs in around 250lbs. The 1800 cc suby engine is aluminium and weighs in at about 200lbs. So more power, less weight, all around better.

While on the topic of weight distribution, the super beetle has been on record for doing subaru swaps quite often, as well as having steering shimmies at any speed above a stop light pace.... These i've read can be remedied with better /newer suspension and bushings all around the vehicle. ( I won't mention it but a quick duct tape fix to that is dropping a cement bag up front with the gas tank... Thats a last resort though).

So far the bug sits the exact same as it did stock. It's so light though it resembles a go cart. Im thinking they put the spare tire up front not because of the available space, but instead to counter the understeer...

#15 Oregon Bugaru

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Posted 14 August 2013 - 10:57 PM

More wiring that will not be making it to this build. Isolating one wire at a time is tedius work but i want to ensure I dont emliminate the wrong harnesses. These are mostly headlights, keyswitch ignition, A.C., blinkers, fans (the new ones will be wired into a new dedicated harness), and some other mumbo jumbo connectors that were never used on the model car they came on. Also most all cluster harnesses are getting deleted one wire at a time as well.

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#16 Oregon Bugaru

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Posted 14 August 2013 - 11:09 PM

I managed in a couple hours after work to narrow down and label one side of the engine harness for all the injectors, instrument readouts, and ignition. I cant wait to button everything back up in newer tidier looms :) tomorrow is labeling all signal wires for the sensors. I may have a question or two before i am done with this stage i feel....

When i am all done with wiring It is an ambitious goal of mine to map my looms for anyone who wants to follow in my footsteps (with jetpack speed). Let me know if you have questions or advise on is wiring switch. My main concern right now is making sure i get power bussed out to the ECU, injectors, and coil correctly.

More updates soon.

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#17 Loyale 2.7 Turbo

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Posted 14 August 2013 - 11:17 PM

This Project is Awesome, I Like it!

 

Can't wait to see it Finished and Running.

 

Kind Regards.



#18 Oregon Bugaru

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Posted 15 August 2013 - 11:10 AM

Thank!! Me too!! Kinda wish it would work on itself while I'm at my day job but I keep forgetting to push the autopilot button when I leave...

#19 Oregon Bugaru

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Posted 15 August 2013 - 10:30 PM

Alright suby folk! I have triva for you! It's a game of "WTF is That and What Does it Do?"

Following the photos from left to right.

1> two wires go to this solenoid looking deal that has vacuum lines going to it...
2> from the solenoid an air line travels to the backside of the engine where it pulls on this vacuum device..
3> what the heck is this circuit and what does it do? Is it part of evap picking up exhaust has and dumping it back into intake for emissions? (I should add that from the vacuum device near the distributor there is a copper line going down to the exhaust port where the manifold bolts up...)

Help would be awesome! Im don't have any literature to guide me along, so I'm swimming just as far as i can see.

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#20 Oregon Bugaru

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Posted 17 August 2013 - 09:36 PM

Successfully got the essential wiring for the suby engine isolated. Just need to add a new circuit from the bus bar up front to power the ECU, injectors, and ignition system.

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#21 goblewagon

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Posted 18 August 2013 - 09:01 PM

well #3 is a egr valve and it does exactly what you said it does. and if you don't need to pass emissions I would take it off and throw it in the trash and just make a block off plate.



#22 Oregon Bugaru

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Posted 19 August 2013 - 11:40 AM

Sweet!! Thanks man!!! I may be moving to portland area or Boulder CO, so keeping it emission compliant is a must. In goes the charcoal canister, egr, CAT, and so on.

Thanks for second pair of eyes. My guess is that the computer tells the solenoid to open up to the egr valve when its not boosting and when the o2 sensor sniffs and says it needs some dirty air in the intake ;)

#23 Oregon Bugaru

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Posted 19 August 2013 - 11:45 AM

I need help again....

Its been about two years since these looms were taken from the vehicle and my photographic memory needs some photoshop...

This red connector... Its right next to the ecu, and is pretty integrated.... Any ideas on where it connected to?

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#24 Rust

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Posted 22 August 2013 - 08:48 AM

Here is my 73 Bug, still chugging along with the air cooled vw motor. 

73bugback.jpg



#25 Rust

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Posted 22 August 2013 - 08:52 AM

And here is my VW camper.  It really needs an engine upgrade, top speed is 60mph on downgrades.  Go to thesamba.com there is a lot of info on doing the subaru engine swap. Good luck with your project.

 

66busfront.jpg







Also tagged with one or more of these keywords: VW, subaru, swap, conversion, turbo, custom, fabrication, bugaru, 1.8l, Mpfi

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