The biggest issue with a restrictive filter would be the engine running richer which might not be too bad as the engines are air cooled and it might run a tad cooler. Anything to keep dust and dirt out of the engine.
Does your Yugo engine produce enough HP to run the turbo? Just had to ask. ;-)
Tom
I have not dynoed the Yugo but based on the math, the 1500 Fiat engine makes 75 BHP over the 1100 engine which makes 55 BHP. These are the same engines, only larger pistons and a longer stroke. Yugo never used the 1500cc engine, they stopped at the 1300cc engine. If you can imagine, going from a 1100 to a 1500 is like swapping a 305 for a 350 on a Chevy.
Then 7 lbs of boost equals 50% more power. So I'm estimating around 110 BHP. The turbo I used was a T25 from a 2.1 liter Saab 9000. It is not sized for a 1500 engine but seems to work great. It spools up much faster than the T3 I have on my Fiat Spider which came from a Volvo 240 of the same engine size.
Yes the car really moves! Torque steer is horrendous though! Since going to a 2.25" exhaust system, If I shift to 2nd gear and stomp it, it makes full boost and will spin the tire. If the car had limited slip, wider tires, it would transfer more power to the wheels. These cars were not meant to be hopped up. I've had to strengthen the chassis the handle to power. Homemade strut tower brace with a fourth engine mount, suspension braces, Addco rear swaybar.
The increase of power puts quite a strain on the steering and suspension being front wheel drive. Right now the car needs new wheel bearings and tie rods. I have not lost interest in the car but have been caught up with my Trabant and my new Citroen 2CV!
I think the wheel bearings were my fault because I pressed them in wrong.
Here is the evolution of the car:
http://s222.photobucket.com/user/turbofiat/library/Yugo?sort=6&page=1
Concerning air cleaners for my B&S engine.
I found a few that might work. The flange ID on the B&S filter is 1.5".
Here is one here for a Honda Ruckus:
http://www.ebay.com/itm/191871067620?_trksid=p2055119.m1438.l2649&ssPageName=STRK:MEBIDX:IT
Here is another one with a 1.5" ID that appears to be solid foam. I'm considering going with this one. I think it might offer the best filtration.
http://www.ebay.com/itm/New-UNI-Sin...46658b1&pid=100005&rk=2&rkt=6&sd=191871067620
Here is a K&N filter with a 1.5" ID only more expensive:
http://www.ebay.com/itm/110931353973?_trksid=p2055119.m1438.l2649&ssPageName=STRK:MEBIDX:IT
And a K&N "clone" but the ID is 1.25". I might be able to stretch it over the carburetor snout or hogg it out a bit with a dremel tool.
http://www.ebay.com/itm/302051833595?_trksid=p2055119.m1438.l2649&ssPageName=STRK:MEBIDX:IT
I'm going to mow the yard today and see if any of these filters conflict with the engine. And to see if the snout of the carburetor would accept a clamp on filter. I may be able to remove the piece that the filters slides onto a bolts to the engine and angle the filter away from the engine.
Whenever I come up with something, I'll post some pics.