SportsFans

Hey guy's I'm thinking about going turbo head with my P3, and need to know do you run the standard three shims or do you make a change? Also is this the [link=http://www.amainhobbies.com/product_info.php/cPath/1_68_164/products_id/8922]TURBO HEAD [/link] I need. Finally what turbo plug is recommened?
TIA

hrdcoreglf

I would call Ofna directly, I could only find a couple of parts for the P3 on ofna parts list and a turbo button was not one of them. When I have had any question that no one could answer, Ofna has helped out.

SportsFans

Ok thank, I didn't even think of that[sm=49_49.gif].

supertib

for a P3 28 you want to start with .5 mm of shim...2 thick 1 thin

NitroTherapist

Shims modify ignition timing right??

SportsFans

Ok thanks supertib! So two .2mm shims and one .1mm. I think mine came with two thin and one thicker. Boy I called Ofna earlier and that Ofna dude was no help. Is it true that the turbo head is harder to tune, man with your help I have this standard head P3 running better than any engine I've had before. Would really hate to mess that up, but I do like a challenge every once in awhile. NitroTherapist I would imagine it would also affect compression?

savagedan89

part number 51536

SportsFans

Thanks savagedan89! Yup that's the one asked about above. It looks like AMainHobby.com are out of stock now. Is there anywherre else i find it?

downunder

Right. Ignition depends on a few things like the heat range of the plug (hotter ignites earlier) and compression. The higher the compression the earlier the fuel ignites so taking out a shim increases the compression by a small amount which advances the ignition point. Think of compression as packing the air and fuel tighter against the plug coil making it easier for the coil to ignite the mixture.

NitroTherapist

check tower

SportsFans

No It seems tower doesn't even stock that item. downunder thanks for the explanation!