Mating Rb26dett Throttle Plenum On Rb25det (neo) Head

[aleks]

updates?

I regret reading this thread....

[neo32]

just a question would of it been eaiser to do the mods to intake rather than head?

[Mr GTS4]

like this?? i bought these awhile ago and are still getting things together before i install, but it is the bottom intake cut with adapter plates welding to the ends that mate upto the 6 throttle bodies. it also uses the standard fuel rail and injectors as well.

Thanks

Curt

[godzilla_753]

I did something similiar NEO head with rb26 throttles heres a pic, sorry the engine bay looks a complete mess ...will be fixing that as soon as i get a few other things sorted out

And this is whats going on it ...What do you guys think of the GT3071r with .64 rear housing? would it be too small?

[MRHD66]

Awesome what I wanted to read

[MRHD66]

I did something similiar NEO head with rb26 throttles heres a pic, sorry the engine bay looks a complete mess ...will be fixing that as soon as i get a few other things sorted out

And this is whats going on it ...What do you guys think of the GT3071r with .64 rear housing? would it be too small?

Did u just cut the inlet RB25neo inlet manifold and weld RB26 tbs to it

[MRHD66]

I did something similiar NEO head with rb26 throttles heres a pic, sorry the engine bay looks a complete mess ...will be fixing that as soon as i get a few other things sorted out

And this is whats going on it ...What do you guys think of the GT3071r with .64 rear housing? would it be too small?

Did u just cut the inlet RB25neo inlet manifold and weld RB26 tbs to it

[godzilla_753]

Not sure if Im understanding you correctly mate but I chopped off the runners of the stock 25 plenum and welded up some flanges to accepts the 26 throttles. After that its all a bolt on affair, well relatively, still had to figure out the tps and aac valve and all that. Runs great tho, nistune on the way from australia and I should have some good numbers to post up soon.

[MRHD66]

Not sure if Im understanding you correctly mate but I chopped off the runners of the stock 25 plenum and welded up some flanges to accepts the 26 throttles. After that its all a bolt on affair, well relatively, still had to figure out the tps and aac valve and all that. Runs great tho, nistune on the way from australia and I should have some good numbers to post up soon.

cheers that's what I ment

[JustinP]

Not sure if Im understanding you correctly mate but I chopped off the runners of the stock 25 plenum and welded up some flanges to accepts the 26 throttles. After that its all a bolt on affair, well relatively, still had to figure out the tps and aac valve and all that. Runs great tho, nistune on the way from australia and I should have some good numbers to post up soon.

Seems a lot simpler than what the OP had to do!

[MRHD66]

Seems a lot simpler than what the OP had to do!

that's what I thought too

[godzilla_753]

Not to offend the op but yeah this was the only way I considered it feasable, welding the head and all seemed a little dodgy to me, and plus I dont have a tig welder handy.

If I had to do it again I would have the flanges laser cut and tapped with threads, we attempted to tap them ourselves but I dont know if we just suck at it or our tap set is old, we couldnt get them tapped correctly to accepts the studs. We ended up getting oversized studs and using nuts on both ends to tighten everything down. Another point to make is that the RB25 plenum doesnt leave the head straight out, most of those runners we had to cut all the way down to the flange and weld our own pipe to it. Was fairly tricky and time consuming to match up all the runners so that they left the head straight out and met the flanges correctly.

[MRHD66]

Not to offend the op but yeah this was the only way I considered it feasable, welding the head and all seemed a little dodgy to me, and plus I dont have a tig welder handy.

If I had to do it again I would have the flanges laser cut and tapped with threads, we attempted to tap them ourselves but I dont know if we just suck at it or our tap set is old, we couldnt get them tapped correctly to accepts the studs. We ended up getting oversized studs and using nuts on both ends to tighten everything down. Another point to make is that the RB25 plenum doesnt leave the head straight out, most of those runners we had to cut all the way down to the flange and weld our own pipe to it. Was fairly tricky and time consuming to match up all the runners so that they left the head straight out and met the flanges correctly.

cheers I've very keen on doin this to my RB25/30