Sunday, February 24, 2008 - 08:15 pm, by: Mike Beck(Gold_40gt)
Hey guys,
Im buying a 1JZGTE motor in the next week or two, doing a TT conversion for my NA 2JZ soarer.
Ive known about the 1.5JZ for a while but, lately been thinking it could be the way to go using my 2JZ bottom end with the 1JZ head.
So far Ive gathered there are a few issues to be solved such as welling up and re-drilling the oil feed routes in the 1JZ head as they dont quite match the 2JZ's ones. Also some thing about the exhaust studs aren't quite the same??
Im guessing 1JZ pistons would be better suited strength wise fitted in the 2JZ bottom end too?
I have done a fair bit of searching on this, it is a fair bit of work but Its easily doable I know the people to sort it but just a matter of pushing it.
Or would it be just best bang for buck to drop the 1JZ 2.5 straight in?
Sunday, February 24, 2008 - 09:43 pm, by: Michael Keen(Spoilt)
my theroy is this, they went to the 2j? why. hehe plus there a lot of aftermarket stuff for the 2j head then the 1j, i say stick with the 2j cheers well my opinion, but if you have a really good turbo setup on your 1j now. then i woulddo the head change to the 1j head 2j bottom. but since you are going from a 2j na it would a lot of hassle getting, this to work and run on a 1j head, like sensors and injectors etc. they might just plug and play not very sure.
but yeah just put the 2j-tt in and go from there. and then sell your 2j n/a motor to sumone that wants to do the 1.5j. i think they close hehe.
Sunday, February 24, 2008 - 11:08 pm, by: Steven Anderson(Cusscuss)
afaik, the main reason for a 1.5jz existing is to keeping the existing intake/exhaust combo (ie if money was spent on a big single) but getting the extra 0.5L, the extra head flow has been found to be a myth.
So if starting from scratch, no point with a 1.5jz.
Theres another thread on this with all the info, oil squirter's, strength, compression etc.
Monday, February 25, 2008 - 09:08 am, by: Matthew Sharpe(Madmatt)
Sounds like it entirely depends on your budget - if you can go 2JZ-GTE right from the start and not feel the wallet pain, then do that.
If you have more time than money, then the 1.5 is going to work for you - and as you are pretty skilled and patient it might make a good project to potter away at - provided you can be without a car for a bit anyway.
Thursday, February 28, 2008 - 07:03 am, by: Matthew Sharpe(Madmatt)
Motor swap is pretty simple provided you label everything as you go. Admittedly I've only ever done 1970's Triumph engines, and they have a few less connections, but then again Toyota engines make it harder to stuff things up by doing all the electricals with plugs that only go in one place, one way around.
The only special tool you need is an engine hoist, and you can hire one of them from Hirepool pretty cheap. Really might be worth having a go - the worst that can happen is you end up getting it towed to the shop for them to complete it. (or you could drop the engine on the front of the car - yeah, done that too! =( )
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