R33 Rb30 Conversion

[mr_rbman]

standard head gasket should be fine, 1.2mm??? i think!

[EVLR30]

thats thing im curious about is compression ratios...

what size headgasket should i run with the rb30e pistons to get a good compression ratio eg 8.5:1 or 9.0:1

[mr_rbman]

thats tough, i think the standard head gasket will give you a ratio of around 8.2-8.3 but i think if you go much thinner than standard u risk hitting valves! I could be wrong though!

[mr_rbman]

who used the head gasket from the vrs gasket kit they got and if you didn't, why? Just trying to make up my mind whether to spend more money on another one, the standard one looks pretty good!

[Cubes]

The std head gasket is fine. Generally ppls use them and do the O-ring thing.

If I were to do it I would most probably go a Tomei Headgasket and use its oil restrictors, slap them in the block while I'm at it.

If this Cometic headgasketever starts seeping water thats the route I will go.

Whats the final power goals.... Generally the only reason ppls use a different headgasket or oring setup is under high combustion pressures (i.e lots of boost and lots of power) its possible to squeeze some of that combustion pressure past the gasket and in to the water gallerys.

[StockyMcStock]

i used the standard 25 head gasket from nissan and modified the front VCT/coolant gallery thingo so that it worked with the new block. time will tell as to how good it works.

[mr_rbman]

i'm only looking at 280-300rwkw's MAX! so i think the standard one should be fine!

[Dahtone Racing]

im going hunting for valve springs tomorrow

does anyone know exactly which ones can be used in an R32 RB25DE head?

do springs from any other head fit?

[StockyMcStock]

i would imagine the springs for an R33 RB25 would be the same. if you want to get out of it cheaply, consider a set of 2nd hand GTR springs. i hear they are a direct replacement

[Dahtone Racing]

thats the whole problem

everyone tells me that GTR springs dont fit but then i get a few guys who tell me they do

im taking mine to compare today and see how i go

[Bl4cK32]

Sky30 runs GTR valve springs in his r32 rb25de head.

RB20 cams are the same as r32 rb25de cams as well....

Dunno about springs though....

[Dahtone Racing]

well now finally someone has actually used em

thanks guys that makes life a bit easier

[MarkE]

Finally an answer.

I have new GTR springs and an RB25DE head so this is good news for me!

[Dahtone Racing]

whered u get your springs from and how much were they?

[MarkE]

With an RB25DE head + RB25DE loom ...

RB20DET computer or RB25DE computer?

Will be reprogrammed to run the RB30DET.

[mr_rbman]

^^^^^^

if its in an r32 just use the rb20det computer!

[MarkE]

It'll be in an R31, heh.

Anyway, I have an R32 RB25DE loom and RB20DET ecu on the way.

Should be able to get the RB25DE loom if necessary.

[Dahtone Racing]

ok i musn't be able to read properly or something

but after reading the DIY for probably the 30th time

i realised that it clearly states the RB20DET valve springs fit the RB25DE head

man how stupid am i lol

even on the box of tomei RB20DET valve springs it says RB25DE as well

thank god i finally worked it out

[Cubes]

A heads up for those looking for an RB25 head.

Japanese motorsport has a long motor.

# 1x R33 GTST RB25DET motor only suit rebuild but complete rocker cover to sump $900

http://www.japanesemotorsport.com.au/engines.htm

[platinum]

There's some guy on calaisturbo trying to flog off an N/A Rb25 head if people are looking, he only wants a few hundred dollars for it!