Supercharger for Subaru?

Tweety · Post by **Tweety** » Thu Nov 01, 2012 9:21 am

Bennie, I'll be happy to just get the jets right with no extra hp. Any extra will be a bonus. HP at the fly will be interesting.

Tweety · Post by **Tweety** » Wed Nov 07, 2012 7:54 pm

What a long day.

Picked up the 'brumby' dizzy I bought from ebay from a wrecker in qLD. Took it to VW performance centre. The dizzy was recoed, tested and recalibrated for the SC.

Found that the dizzy was different. there were two adjusting lugs on it (where the bolt to loosen so the dizzy rotates). also the dizzy was identical excpet for the bottom cog that was fixed higher up. Maybe you guys can tell me what its off. So we had to swap cogs, fix it and grind out a few mm from that adjusting slot so the bolt will fit inside. an hour lost.

Then that dyno. Gave Daniel all the info you guys have been supplying me. eg the engine has 180 main jets....advised to get down to say 140. So we went there!! Very poor performance. Tried 160 a little better but still running lean at higher revs regardless of water injection on boost. Back to the 180's. ok.

Then we checked the idle jets. Daniel explained that these are used when cruising. cruising is where my poor economy is. They were '52's'. Niot real large but smaller available. He had only one 40 so we put that in and I was to pick up another on the way home.

Attended the Thornbury Carbie Service and picked up 2x175 mains (worth a try), 2x45 idles and 1x40 idle. so will try the other 40 and take out the 52. But even with the one 40 in it the trike was more economical one the way home.

Then an oil leak. From somewhere! oil covered the thermostat housing area. Daniel noticed some fumes coming from the mini filter on the valve cover LHS. Wondering If I've put the PCV valve on the wrong way on the other side. All anti pollution gear was taken off this engine. Gotta check it out tomorrow.

steptoe · Post by **steptoe** » Wed Nov 07, 2012 11:13 pm

L Series ?? Has two ears for hold down

Some numbers off the body stamping will help

Tweety · Post by **Tweety** » Thu Nov 08, 2012 8:40 pm

Finally!!!!!

Had an eventful day today. and I'll need your advice guys - more of that later.

The 40 size idle jets turned out too small. this was because the trike died on take off with more than medium throttle, as advised by Daniel and read on the www. so placed 45's in there. perfect. so idle jets have been reduced from 52 to 45's. doesnt smell rich very much at all now.

The mains were 180's. 135 and 160 were tried and there was reduced hp so the 180's stayed in there. I bought 175's and 170's yesterday judt to try after the idles were sorted. 175's were better, 170 had a flat spot ever so apparent at mid range. so 175's remained.

The dyno results were the same. 82hp at the wheels, so identical no readout was sort. Acceleration with the recoed dizzy seems better.

OIL leak. I was worried about a fair bit of oil over the LHS of the engine turns out of did come from the top of the valve cover where there is a short section of 5 8th heater hose and a mini filter. took the filter off and noticed fumes being forced out. no wonder Deb was smelling them. Now when I installed this ea81 all anti pollution gear was removed. Toonga showed me how the air circulation worked without the pollution gear (you can legally do without anti pollution gear on a trike ). air should be drawn into the LHS valve cover, circulate then exit the RHS valve cover to the PCV valve then carbie manifold and finally exhaust. So big question is- why is it pumping out fumes and oil from this side???

I found in my box of tricks a one way valve...off the ea81 when ourchased...from some place!. fitted that to the valve cover exit then the mini filter. it certainly fixed the fume issue. I've been putting up with black clouds form the exhaust for weeks now with those too large idle jats. so expected more fumes from the exhaust but no! no fumes at all. rather odd but nice lol.

Anyone got any ideas on why fumes are emanating form the LHS (thermostat side) valve cover before the one way valve went on? By the way...now that I've gone to the trouble getting water injection...a 103mm pulley from PULLEY BROTHERS might be sought in a while. this will give me around 9-10psi.......

Finally in this report- baffles. video coming. wont show much difference because up to 90 kph there isnt any difference that I could determine. but above that speed around 2600rpm it is quieter. this is just what I wanted.

steptoe · Post by **steptoe** » Thu Nov 08, 2012 9:29 pm

My EA81's have a little breather filter on the RHS cover and have extended one by heater hose to sit right up high - near my nose it seems, and does smell a little fumey from time to time....now a PCV valve jammed in there should help with air flow direction genius Tony !!

Why do they do it ? maybe just not enough suck from LHS and through burning device ?? My EA81 is fresh build, well less than 20,000km from rebore etc ..... My other EA81 is running a catch can, and is catching very little.
Maybe one of us needs to try a twin draught LHS rocker cover outlet to two PCV valves ?

Post by **TOONGA** » Thu Nov 08, 2012 9:38 pm

You may want to look into adjustable idle jets

http://www.ebay.com.au/itm/160710074241 ... 1423.l2649

positive crankcase gases will vent both ways, thats why on the brumby motors the vents are on the clean air side. Is your PCV (the valve) working properly?

TOONGA

Tweety · Post by **Tweety** » Thu Nov 08, 2012 9:43 pm

Yes Toonga checked the PCV valve working well. slight restriction through though but think thats normal. with that little bit of restriction it might encourage fumes to exit where there isnt restriction at all- the LHS?

So the one way valve is successful. thanks Johnno and Toonga. certainly stopped oil from exiting all over my engine/exhaust.

The videos of the baffles are a problem uploading. drat!

Tweety · Post by **Tweety** » Thu Nov 08, 2012 10:38 pm

for cams sake

one way valve inside tube at join

Baffles

Tweety · Post by **Tweety** » Fri Nov 09, 2012 12:41 pm

Toonga, the adjustable idle jet is a good concept. couldnt find one fo a deloorto let alone around the 42-50 mark in size.

running real good now anyway.

Subydoug · Post by **Subydoug** » Sun Dec 30, 2012 7:23 pm

Hey Tweety,

The VW auto tranny, does it use a vacuum modulator? If so how have you got it working in conjunction with the charger? My 3AT kicks down when I hit boost and wont change back up untill I back off. Potentially dangerous if going at HWY speeds and hit a hill or something. (kick down and over-rev) Just curious.

Regards

Doug

Tweety · Post by **Tweety** » Sun Dec 30, 2012 8:51 pm

Doug,
My engine is mated to a vW type 3 auto 1970 era. The kickdown works with the vacuum solonoid and that is tapped from the manifold between the carbie and the SC. I havent had a problem with it. if your tube is off the standard engine manifold then that isnt right because of the boost? have you tried screwing in the small adjusting screw in the middle of the solonoid? that will help. IMO dont touch the adjustment on top of the auto at the front. Before adjusting the screw , screw it in till it stops and count the turns for future reference. turn it back out and screw it in half a turn at a time.

steptoe · Post by **steptoe** » Sun Dec 30, 2012 8:53 pm

Doug, has this problem always been there or just surfaced ?

The 3 speed 4WD auto in my L Sedan GLTA used to do same and in conjunction with a marshmallow soft valve spring thanks to the service staff at allheads letting it slip through their diligent hands

, that and LPG under boost - I'd sometimes get a backfire disabling the car until I walked back down the road to collect my clamps and silicone pipes

When I removed and discarded the auto I found the source of one tranny fluid leak - the vacuum can on the right side up front near the pan was loose , as in finger tight so may have been losing pressure or getting air in the works. New genuine springs fixed the other problem

The vacuum source was below the throttle body. I blocked it off with a rubber bung and 65,000km later it blew off unclamped and gave me a rough / lean idle until spotted.

There is a whole heap of test procedures to check if you are running std engine/ gearbox combo in ya Suba

Subydoug · Post by **Subydoug** » Sun Dec 30, 2012 9:04 pm

Arrrh yes, that makes sence. Hmmm, wont work for me because Im running a blow through config. With no throttle butterfly before the SC I wont develop a vacuum there.

Yeah, in my case the manifold sees boost pressure, so it confuses the gearbox. Oh well, looks like a tranny swap is the easiest solution.

Regards

Doug

Subydoug · Post by **Subydoug** » Sun Dec 30, 2012 9:11 pm

steptoe wrote:Doug, has this problem always been there or just surfaced ?

The 3 speed 4WD auto in my L Sedan GLTA used to do same and in conjunction with a marshmallow soft valve spring thanks to the service staff at allheads letting it slip through their diligent hands , that and LPG under boost - I'd sometimes get a backfire disabling the car until I walked back down the road to collect my clamps and silicone pipes

When I removed and discarded the auto I found the source of one tranny fluid leak - the vacuum can on the right side up front near the pan was loose , as in finger tight so may have been losing pressure or getting air in the works. New genuine springs fixed the other problem

The vacuum source was below the throttle body. I blocked it off with a rubber bung and 65,000km later it blew off unclamped and gave me a rough / lean idle until spotted.

There is a whole heap of test procedures to check if you are running std engine/ gearbox combo in ya Suba

Nah mate, only since I put a supercharger on it

. The Tranny is doing exactly what it should.......It just doesnt go hand in hand with boost pressure. Kicks back as soon as the BOV closes (which isnt the end of the world) but then it wont change back up untill I back off and the BOV opens back up. Gives this horrible lurching combo, and pretty poor driveability.

Regards

Doug

steptoe · Post by **steptoe** » Sun Dec 30, 2012 11:06 pm

OK, mine saw boost pressure ......but guess all that changed if the throttle was lift off.

And Doug , excuse me for forgetting what you are running this SC on ??? Brumby ?? EA81??

Once had a cable kickdown that was adapted by a specialist after my engine conversion, cost me a weeks pay for their Saturday afternoon tinkering - gave me an internal grinding screaching on hard accel and was enough for me to go manual

Subydoug · Post by **Subydoug** » Mon Dec 31, 2012 12:12 am

steptoe wrote:OK, mine saw boost pressure ......but guess all that changed if the throttle was lift off.

And Doug , excuse me for forgetting what you are running this SC on ??? Brumby ?? EA81??

Once had a cable kickdown that was adapted by a specialist after my engine conversion, cost me a weeks pay for their Saturday afternoon tinkering - gave me an internal grinding screaching on hard accel and was enough for me to go manual

Its probably ok, it just feels a little odd, especially with the blow off valve and was just curious on what Tweety was doing to give the stock feel.

Nah SC is on my 82 wagon. Got a little creative during my time off and stuck an amr500 in it. Stock ea81 with retarded ign and EFI fuel system (boost reg fuel pressure).

http://www.youtube.com/watch?v=pMdW9JwR4TI

Noticeably more torque, only 4psi as well.

Thanks for the info Guys, appreciated.

Regards

Doug

Tweety · Post by **Tweety** » Mon Dec 31, 2012 4:20 am

my system s draw thru. vacuum source just after throttle body so is normal location. Cant help here Doug. good luck regardless.

steptoe · Post by **steptoe** » Mon Dec 31, 2012 7:22 am

and EFI ?! Did you share any of this with pics with us ?? Sounds like a cop magnet - just tell 'em the auto front pump is shot

Subydoug · Post by **Subydoug** » Mon Dec 31, 2012 10:38 am

Not EFI, just an EFI fuel system (high pressure pump, return line, FPR). Still running the weber 32/36. Huge cop magnet, that clip doesnt do it justice. Still messing around with things to try and make it quieter. Nah no pics only done this over the last few weeks. Its a work in progress. It all works, just tweaking now.

Cheers for the info Tweety, I may end up putting a butterfly in front of the supercharger to reduce its noise off boost. That will give me a vac signal that is near on normal.

Regards

Doug

Tweety · Post by **Tweety** » Sat Jan 12, 2013 4:20 pm

No worries Doug.

I've had a small mishap. Recall some many months ago that the ea81 non sC engine went into Tweety. The crankcase ventilation system was an issue. Toonga gave me a diagram that showed the fresh air was drawn into the engine via the dizzy side valve cover. then exits out of the opposite cover to the pcv then into the engine.

Problem arises when plumes of smoke followed me up the mountain near home. the source of all the oil in the engine was the front main seal. It was in crooked eg had blown out one side. but also the dip stick had blown out about an inch. Warning signs for me.

I have a catch can now between the alt side valve cover and the pcv. I connected the other valve cover to it creating a "T" junction so all fumes now go into the catch can then pcv and burned.

However, this is exactly what Toonga old me not to do. Wondering what you guys think? The supercharger creates more blow by so where else can it go?