Changing From 25 Head To 26

[WHITER33GTS-T]

Im looking to change from my 25 head to a 26. What will need to be changed in the wiring or will everything swap over???

If I go with the 26 I will have a Greddy plenum with 85mm throttlebody and custom fuel rail for sale and a 6boost manifold to suit T51r

[Adriano]

Everything should swap over, except you will have to sort somthing out with the injectors. Also make sure you use the coolant temp sensor that matches the ecu.

[WHITER33GTS-T]

Im running 1000cc top feed injectors and Haltech E11. Haltech runs a patch loom into the R33 gts-t loom

[T04GTR]

no problems then. hopfully you have already put gtr headbolts in.. and a 26 headgasket of corse.

[WHITER33GTS-T]

The 25 head was drilled to run GTR head studs 12mm i think. Yeah was thinking I would need the 26 headgasket.

So everything else will swap over and work??? Ignition and splitfire coils...?

Edited March 16, 2009 by WHITER33GTS-T

[Craved]

dont think your CAS will swap over from the 25 to the 26 - you'll have to check the keyways.

[clip14]

will the head swap affect static compression at all?

[WHITER33GTS-T]

Didnt think of that. Was running 8.3 comp with the 25 head. Not sure of the thickness of the headgasket tho. Will have to find out

[Adriano]

CAS should swap over if you have an aluminium mitsubishi early rb25 type

[WHITER33GTS-T]

What thickness head gasket should I use??? Would like to keep the same comp ratio 8.3.

Are the chambers in the 26 head much bigger than the 25???

[WHITER33GTS-T]

What can the 26 head make power wise before upgrading cams and springs??

Is it worth putting it on stock or put new parts in and go harder??

[jangles]

im no expert,

but the power figures that you have been after,

would be definitely worth upgrading cams and springs before putting head on.

[PM-R33]

I'd also do seals and guides for peace of mind if i was you.