Turbo'ing a 3K

[RA60 KID]

hey guys
ive got a stock standard 3K out of my corolla, i have a 2 inch SU Carbie and a R32 RB20DET Turbo hoping to combine all these and turbo the 3K now this may not be worth doing considering its a 1.3L but im just wondering what i would need to do along the lines of internally through the motor im not looking at big horsepower or anything its just that i picked this turbo up and i am capable of making custom manifolds up to suit.




cheers Nathan

[slide86]

lowering the comp may help. i think i heard of using 4k with some 3k parts to lower the comp, but i cant be sure????

stiffer valve springs also a maybe?
i have seen it done, so its not impossible. im sure there are a few folks around that will no all. stew should be able to help with the K series info.

have you thought of using 7k EFI setup at all, and a fuel computer to control it?

[RA60 KID]

ok thats the advantage of having a few diffrent K motors you can mix and match parts and as you said you can use a 4K head to lower compresion as for the valve springs im not entirly sure where to get them and what will fit and yea i havnt thought much about the 7K EFI gear i havnt got too much money to spend as this is a second project i still have to finish my celica carbie is simple easy enough to setup and tune and the SU is perfect for a turbo you just set it up before the turbo.

[oldcorollas]

valve springs, performancesprings.com.au CB4 or CB4A (unless you want higher seat pressure, then go for FJ20 sized parts? 80lb seat) need to grind the retainers a bit to fit the inner spring at times.

3K is 1.2L 4K head is the go for cheap lower CR.

whilst carby is not my choice, whatever is fun for you

[RA60 KID]

valve springs, performancesprings.com.au CB4 or CB4A (unless you want higher seat pressure, then go for FJ20 sized parts? 80lb seat) need to grind the retainers a bit to fit the inner spring at times.

3K is 1.2L 4K head is the go for cheap lower CR.

whilst carby is not my choice, whatever is fun for you

hey mate thanks for that haha is it a 1.2L what would you say needs to be done to the motor for the turbo? and how would you go about it?? any idea of what hp it will make? and do you think its worth it??
cheers nathan

[oldcorollas]

umm.. smooth all sharp corners in combustion chamber, i would also unshroud valves.

pistons suck.. if you have ACL pistons (if it has been redone) they might be ok. the stock pistons are so brittle, they fall to pieces NA anyway. i guess forgies are out of the question?

cam? go more lift 400-430thou ...

you need boost retard happening, or you will kill things quickly... i am amazed how many people just have fixed timing with backyard turbo


umm... powah? no idea....but sounds like fun for no reason

post pics, before after and during the explosion

[RA60 KID]

umm.. smooth all sharp corners in combustion chamber, i would also unshroud valves.

pistons suck.. if you have ACL pistons (if it has been redone) they might be ok. the stock pistons are so brittle, they fall to pieces NA anyway. i guess forgies are out of the question?

cam? go more lift 400-430thou ...

you need boost retard happening, or you will kill things quickly... i am amazed how many people just have fixed timing with backyard turbo


umm... powah? no idea....but sounds like fun for no reason

post pics, before after and during the explosion

LOL before during and after the explosion aye lol i want to build this as a daily drive, with the 4K head should i just use a stocko hg and is the stiffer valve springs really needed? also what about the boost retard what do i need to do for that explain lol
cheers Nathan

[styler]

boost retard - you have to retard the ignition timing in a boosted engine, you might get away with a fixed ignition timing like a lot of people do if the boost level is low ie up to 4psi or so.
i would check with people and confirm on this though.

if you dont then the engine will detonate, ie the fuel will burn before its meant to, in the 3k the ignition timing is 8 deg BTDC or so, ie 8 degrees before top dead centre, this is when the fuel mixture ignites. if you dont retard ignition timing in this 3k turbo motor it will probably ignite before this and the piston will be far from the top and still coming up on the compression stroke.

now you can play with ignition timing, like on the 3k a few degrees advanced, which is in the BDTC direction for a slight improvement.

go look up ignition timing for normal engines and timing advance.
then look up ignition timing for turbo engines and timing retard
bloody retarded turbos

[NeoNasty]

check out www.rollaclub.com Been done lots of times before.

Theres packs of info on that site about doing it.

Good luck.

[styler]

also a lot more people seem to supercharge the k motors these days:

more suitable for the motor capacity
less mods needed to motor internally if any
easier to fit / mount
boost from low down to med level of boost high up.
cheaper
im not sure on the carby side of things though

but hey small turbos are also popular at low levels of boost

[Boost+K]

if you want to run suck-tho then you'll need a different turbo, one with carbon seals. if your running blow-tho then you can use your turbo but you gonna need a rising rate fuel reg or a massive base pressure. i'd had a few 4k and 5k turbo's never last more than 8months of thrashing normally the rings that let go in mine. i dont run any boost retard tho lol

[crostek]

for cheap interals try 1GGTE pistons and rods, will give you lower comp and the rods are twice as thick as 3K ones

[emp?]

for cheap interals try 1GGTE pistons and rods, will give you lower comp and the rods are twice as thick as 3K ones

is that for 3K and 4K?

I just happen to have a tired 4K and a turbo setup for one

[RA60 KID]

is that for 3K and 4K?

I just happen to have a tired 4K and a turbo setup for one

hey mate
how much you want for it?? pm me with pics
cheers nathan

[RA60 KID]

boost retard - you have to retard the ignition timing in a boosted engine, you might get away with a fixed ignition timing like a lot of people do if the boost level is low ie up to 4psi or so.
i would check with people and confirm on this though.

if you dont then the engine will detonate, ie the fuel will burn before its meant to, in the 3k the ignition timing is 8 deg BTDC or so, ie 8 degrees before top dead centre, this is when the fuel mixture ignites. if you dont retard ignition timing in this 3k turbo motor it will probably ignite before this and the piston will be far from the top and still coming up on the compression stroke.

now you can play with ignition timing, like on the 3k a few degrees advanced, which is in the BDTC direction for a slight improvement.

go look up ignition timing for normal engines and timing advance.
then look up ignition timing for turbo engines and timing retard
bloody retarded turbos

lol i get it now cheers mate