done quite a bit of research on the plenum formula... for n/a it is 80-100% of engine displacement. for turbo it is 2x egine displacement. so for my dads punched out 1.5l i designed a 3l plenum. bare in mind that if you want to be real precise this includes the runners as well. also put trumpets (bell mouths inside the chamber for better air transition)

a

just wondering what the known options are for pistons and forced induction. i was running acl e15t pistons but i want to try and find something with chrome moly rings.

edit... sorry for an a14

thanks for that. what is kyp? i assume an import place?? meaning the turbo is genuine but secondhand not new chinese rubbish.

after measuring up my old s15 turbo i will take one of these too as it is only the exhaust wheel and housing that is differnt.

comes off a gtir pulsar or a will take a disco potatoe with the smaller .64 air ratio on the exhaust side.

sorry edit
has to be in good condition

so where can you get the nismo or tomei product in ozor do you have to get it from japan?

it was definately hitting as you can see the marksin the head and the surfaceof the piston is clean in that area. even with head gasket thinknessinto account i prefer not to run positive deck height to allow for stretch at high rpm. these pistons should have been machined. it is easy to miss if you dont how to build and engine but dont really check for tolerences.contradiction in terms i know... but there are plenty of guys outthere that know how to put and engine together in their shed but dont think to check clearences.

as for the pistions. we are not talking about little chips or detonation marks here. a third of the pistion top lip (concidernig it is a dish type de-comp piston) has broken off to the ring lan leaving the in tack all in one go. thatis not detonnation. thats fatigue.

just thought i would let everyone know my miss fortune. my motor blew up on the weekend. the annoying partis that it went because the motor was not built properly by whoever built it. the pistons sit proud of the block by about a mm! they were never decked so it had been hittingon the head. what amazes me is thatit lasts 1 year. pistons 1 and 3 had part of the lip of the dish smashed off. something even more interesting is no. 1 looks like it had been like that for a long time as there is carbon build up there and when i did a comp test 6 monthsago it was low. i think it was like that when i got the car... and it still made150 on 12 psi.

well after a rebuild and a few more mods should be better than ever. they were acl e15 turbo pistons. has anyone been using anything else with good results?

where are you? 12a are a dime a dozen in australia. you'll get one with a gearbox for 30-500 bucks. if you are serious about this feel free to ring me as i have done the conversion as well.

motor is built, bored out a15...
gt2860r on 15psi for street and 25 to play
custom manifolds were made but taken back and got money back due to poor quality. now in the process of doing it ourselves

3in ss exhaust is done
modded s13 aluminium rad
ems stinger ecu with coil pack set up
r31 diff and tailshaft done
toyota box with dellow kit done
r31 struts with r32 discs and calipers done
next is fuel system
intercoller and plumbing done

sorry dont know much about lpg other than you can run more boost becuase of the higher octane.