R34 Na Motor Into R33?

[jjman]

Hey peeps,

Iv got an R33 that has recently had an R34 motor put into it by a reputable shop.

Im just wanted to double check that this is going to be fine and be reliable long term.

Essentially its just the R34 N/A (block/head) into an R33 so all R33 stuff including the computer running it.

Is this going to be fine or what?

For example, one thing i have noticed is that (via consult cable) the base operating temp is 85 degrees. Which i hear the R34's were designed to run hotter n therefore have a higher temp thermostat in them. But is this going to be ok with the R33 ECU running the show?

Otherwise the timing map etc of the R33 ecu running the R34? are the compressions and cam duartion the same?

cheers

[Captain Natro]

Hey peeps,

Iv got an R33 that has recently had an R34 motor put into it by a reputable shop.

Im just wanted to double check that this is going to be fine and be reliable long term.

Essentially its just the R34 N/A (block/head) into an R33 so all R33 stuff including the computer running it.

Is this going to be fine or what?

For example, one thing i have noticed is that (via consult cable) the base operating temp is 85 degrees. Which i hear the R34's were designed to run hotter n therefore have a higher temp thermostat in them. But is this going to be ok with the R33 ECU running the show?

Otherwise the timing map etc of the R33 ecu running the R34? are the compressions and cam duartion the same?

cheers

I may be wrong, but I thought on of the 34s one of there cams were only 234 duration as opposed to the 240 in 33s?

[jjman]

yes id heard there was a difference between the cams.

Tho is the NA motor also different and referred to as the 'NEO'? or only some/later versions? The one i have looks identical and does not have that weird 'lobe' on the pipe going to the inlet manifold like other NEO's iv seen (but maybe that is just a turbo motor part?)

see pic- exactly the same

[KiwiRS4T]

Hopefully they have changed the ecu for an R34 Neo one (asuming you have a manual trans). Not sure what you mean by weird lobe but R34s have a traction control thingy there (unless your'e referring to the bov). Neos are higher compression and quite a few other differences. Nothing that should be a problem although I think you need the correct ecu (and loom) but problematical if you have an auto.

[jjman]

Nope, no ECU change or anything.

Just a straight motor swap of everything inside the headers...

by that lobe thing i mean this

but then i also see that NEO motors can look like this?

what is what? is one a turbo and one a non turbo?

[Miguelone]

Top one is det neo, bottom one is NA, looks like you have the r33 intake manifold etc on your Neo engine. It should be fine running all the S2 electronics though probably not as efficiently as it would on the NEO ecu due to differences in the head design.

[jjman]

yeah as i said it is running all of the R33 equiptment (just double checking you are referring to the pic higher up in the thread with teh red engine bay, not the ones posted above...).

Otherwise they have also modded the spark plug signal system as obviously it doesnt use the remote spark sender (i think that is what it is called) that sits at the back of the valley cover next to the fire wall on S1 R33's.

Basically the car runs fine and perfectly and has done for a few thou kms- tho iv only run 98 in it as aware of the higher compression thing. I just want to make sure that it will stay that way into the future!

Only other thing i can think of doing is changing out the thermostat as it is using the R34 one that came with the motor, while if the R33 ecu is running it seeing running temps of the high 80's its going to be winding on the clutch fan pretty hard to try to get it down into the 70's/low 80's as per the R33 parameters?

Anybody on here can comment on what temps they see on the motor via consult to the ECU?

I looked and it is running 86-89 currently with the R34 thermostat in it...

Edited November 14, 2012 by jjman

[Miguelone]

I wouldn't be worried about the thermostat, you're talking 5degrees difference between the neo and earlier thermostat opening temps and the Neo is designed to run hotter so you're probably better off leaving it.

[jjman]

alright, sounds good.

tho u sure it isnt going to be pushing the clutchfan harder in order pull temps down that is essentailly impossible because of the thermostat?

Anybody have any idea at what temp the R33 N/A ecu starts pulling timing and adding fuel?

[WMDC35]

i wouldn't worry about any of that, i put a neo 25 into an a31, ran all the std neo elecs and maifolds etc on an r32 rb25de ecu, ran mint, have sold the car but know it's still going no problem 3 years later

[jjman]

i wouldn't worry about any of that, i put a neo 25 into an a31, ran all the std neo elecs and maifolds etc on an r32 rb25de ecu, ran mint, have sold the car but know it's still going no problem 3 years later

thats what i wanted to hear.

too easy.

Yeah i figured it was all good as it ran fine. Just didnt want to sleep at night thinking there might be a handgrenade in the draveway that i paid good money to have built... :s