Did someone say MegaSquirt?
I want to use forced induction but can't make a desision on which type to use.
A supercharger will be easier to implement, that's for sure.
I am looking at the GT0632SZ Garrett turbo or the AMR300 supercharger.
The GT06 has an integrated exhaust manifold and turbine housing intended for some Indian micro car. Unless Garrett starts making a universal turbine housing available, the GT06 isn't even an option. Their GT12 model is the next smallest option with a standard housing, but even it's on the big side for a sub-40hp engine.
I have seen mini bikes on youtube with turbos making 7-10psi, but have only seen one supercharged bike (with the AMR300). The guy was running a gx390 and claimed it made 20psi. I have no idea on how true this is. Any suggestions on which to use or which would make more power would be very helpful.
Are you only concerned with making maximum power? If so, turbos are generally a better choice.
The turbo uses the exhaust gas to spin the turbine, which is free,
The exhaust energy is
not free. It comes at the expense of increasing exhaust pressure that the engine has to pump against. Turbos cost engine power to run, but fortunately it's considerably less than a supercharger.
I believe that the hardest problem is fuel supply on boosted small engines and more importantly ignition timing. Most boosted engines pull timing out as boost increases.
Yeah, but a draw-though blower doesn't need much for fuel pressure. A carb can just about remain stock in that case. Blow-through would require a high-pressure pump and 1:1 regulator plus some other tricks to keep fuel going where it should.
A rule of thumb on timing is about 1° per psi, but that is highly dependent on the engine design and configuration.
Do you think a small engine would create enough exhaust power to boost like 10-12psi?
The amount of power it takes to compress air to Xpsi depends on the air volume. 50cfm at 10psi might take 1hp or less; 10psi at 800cfm could take 50hp. That's about what it takes to run the supercharger on a 600hp engine.