RB20 / 25 head onto rb30 block

[TJ]

so how is it done guys?

[RB20ZED]

i do know that the 20 head doesnt go on as easy (or doesnt go on at all) due to the galleries not lining up that bout all i know tj :> go a 26 more hp for less work dude fark the 30 all together. (it was so poor they stuck it in a holden lol) jkn

[Morgs]

Its entirely possible RB25/30 is cheaper when done on a budget..... I think you need the non VCT RB25DE head and RB30ET block, but you can use any varities of this I believe

[Mike_Hunt]

From memory the rb25 head is basically a drop on swap except for a few galleries that fall out of alignment (machine to fix), cc'ing and timing belt etc. If anyone is interested i have a ported/flowed 25det head with all standard ancilliaries (no manifolds) lying around..

[TJ]

lets be more specific -

25 head onto a rb30 in a 31 skyline - would u need to switch to coil packs etc ?

[Lord_Muck]

The part i always wondered about, which ECU do you use? Or do you need to completely start from scratch and get after market, or ROM a standard one. And which exhaust manifold, i suppose the rb25det one.

[Morgs]

From memory I've seen big aftermarket units used, but a budget option is RB20 ECU (Don't quote me on this)

[got boost]

http://www.users.bigpond.com/allanreynolds/twinvl/thenewtwinvl.html

[Mike_Hunt]

It's almost like an engine conversion, you adapt all of the ancilliary support systems form the donor head (that should come with it) - coil packs, angle sensor etc. obviously because the rb30 uses a dizzy.. ecu you would go aftermarket, why bother pissing round. Then of course the airflow meter/map - tps thing comes into it depending on which management you choose (you'd only bother to use a/f meter with something like power fc) and obviously the vl/r31 afm is useless. Most of it is pretty straight forward.

[SmItLeR]

http://www.skylinesaustralia.com/forums/showthread.php?t=15420

i done some homework on this as i had an idea to shove it in my silvia - but there was MAJOR clearnce issues with the bonnet (way more than the RB25 clearance issues)

on that link is a PDF file with a full summary of that thread - good piece of tech information to read up on :D

enjoy

[TJ]

if this happened it would have been in a r31... so ample bonnet room..

i most likely wont be going down this path now... but a mate is interested.