DiscardTheWeak

Hey Joshua, did you ever get this injector setup sorted out?

This is exactly the same question I have more my build as well. HKS 2.8, VCAM and +1 valves. Very interested to know how it worked out for you. I know Step 2 VCAM requires piston relief cuts, however, will the relief cuts that piston manufacturers do work with oversized valves? Its certainly a good question, and probably a common combination these days

Hey there, did you ever get your head sorted out. I have a similar issue, where I have an overbuilt CNC ported head with oversized valves, but am switching to 2530 ish size turbos. I have 260 10.2 procams that I can use, I’m just kind of worried about that the big power work on the head will affect low end power. The bright side was I hoping to make power at lower boost.

I have the factory BNR32 bearing carrier as part number 30501-S0200, superseded by 30501-S0284, those are 18mm carriers. Kudos Motorsport said I’ll need the 14mm carrier 30501-N1604, which is the same one that many twin plates come with. Not being argumentative, just want to be sure this is correct

Oh wow, that confuses me even more, as that is the exact opposite of what I’ve been told. I was under the impression 18mm was the factory height, and the twin plate clutches were taller, requiring a shorter bearing carrier.

Thanks, have you personally used the 18mm carrier with the Nismo twin plate? I’m told a 14mm carrier should be used to account for the increased height of the clutch, which makes sense. Of course I’ll measure all this to be sure, but these carriers in various sizes aren’t easy to get quickly.

Sorry to revive such an old thread, but can anyone confirm the proper carrier that is used for the Nismo plate in a push configuration? The manual makes no mention of using a reduced height bearing carrier, however I’ve heard more than once that a reduced height bearing carrier is needed, I believe one from a Pulsar or Bluebird, don’t recall. The only component that comes with the clutch is a throw out bearing, which is a standard unit. Thanks for the help

Hey there man, sorry to go off topic, but when you installed that twin disc, what bearing carrier did you use? I’m told reduced height bearing carrier should be used in order to account for the increased height of the twin disc, however Nismo makes no mention of this and did not include a new carrier, only a new bearing. Any suggestions? Thanks

Hello Ben, was curious what your findings were with this head project? Mainly curious how using the 20de head worked out. I’ve always been curious how interchangeable these heads were , 25det, 25DE, 20de, 20det, 26, NEO, esc. Obviously the flanges are different and some head stud differences, I believe some coolant passage differences, but as far as castings and flow capability, I’ve been curious how similar they all are

Hello Ian, sorry the project had to come to an end, I loved following this. Was curious if you had any comments on how the original RB31 version with the steel spacer and open deck compared to the newer design which used the aluminum semi-closed deck design? You had alot going on at once, so at times I got confused which engine was which and what the goal was for each. I know the original version was more of "sleeper street" configuration, but are there many design compromises that limit it in your opinion, say up to 1000hp? Thanks again for sharing all this, I know its a pain to upkeep a build thread

I’m still trying to determine what the original plating is. The new rails I get all appear to be R34 rails, and the plating on each one is different than the next. Blue, purple, silver, faint gold, but no yellow zinc. I have no idea what the r32-r33 rail looked like originally because I can’t find a NOS one, or a one that is not corroded. Cadmium platers are not that hard to find in the US.

I actually wanted to know for replating purposes. I am restoring a GTR and I want everything as it was originally. The only NOS rails I see available are for R34’s, and the plating seems different every time I get one. Some are blueish, some are silver/gold, other very gold. Cadmium was used extensively when the skyline was being produced. I’d like to know the real plating was

Is the factory RB26 fuel rail even zinc plated, I was under the impression it was cadmium plated from the factory, like the fasteners. Am I wrong on this?

Are tomei procam 260 10.25 drop in when their buckets used?

Thank you. Thats what I was thinking, however that is not exactly what the common response its on the forums. Basically, you gain half of the base circle reduction in clearance. So a 31mm base circle, like HKS step 2 will gain .5mm more clearance? Is the common consensus that 9.8mm is the highest acceptable lift on a stock base circle without modifying for clearance? Technically making an HKS 31mm base circle, 10.2 mm lift, drop in as well? Thanks for the info, these companies are hard to get in touch with

Hello all, I am researching a cam setup for my RB26. Can anyone please confirm from their experience, whether or not Tomei Procam 260 10.25mm lift cams need head relieving for lobe interference? The common answer is yes, anything over 9.8 or so, you need machining. It my understanding that this is only true with factory base circles, which is why many companies make base circles smaller, such as the Tomei Procam which use 30mm base circles, OEM being 32mm. HKS use 31mm in the step 2, I believe JUN does as well. When installed with Tomei lifters, do the 10.25mm Procam become drop in? Thank you

I do not know why the lines show coolant flowing that direction however. That water pipes flow towards the back of the thermostat, not away from the thermostat, unless I am wrong.

Thank you for the response, this is what I was hoping for. I assume that means the 3/8” nipple on the heater pipe below gets capped as well? This is what confuses me, had it been just a return path for turbo coolant, I’d have no question to cap. However, that 5/16” nipple on the bottom of the plenum tees into the “behind head tubes”, which then terminates in the heater pipes. That is why, I was thinking it was more than just a turbo water return, and more of a closed thermostat bypass tube. For cold startup or something. I trust you that it can be capped, as others have said the same, I was just hesitant. Attached is a pic Which you can see clearly the hoses, and nipples I am referring too.

Pm’d

Interested in the outcome of this question. Gone single turbo, and no longer need a rear turbo return, only the front return. Every normal after capping that rear fitting? Is that fittings only function, the rear turbo water return? I see that it tees into the heater tubes as well, is this a coolant path for closed thermostat operations as well? Thanks

Wow! 9174 on m RB20, is that a mock up engine or a crazy built engine? Great info, thanks again

Thanks al it for the pictures. Is that an 8374 or 7670? They both share the same frame, but the 8374 has the larger compressor.

Im interested these lines as well. Any leads would be appreciated

No, I am not using the HKS manifold. I would very much appreciate pictures of your setup, as it would help alot. The 6758 and 8374/9180 are quite different in size. Id even be interested in who made your manifold, would save me the trouble of making one. Thanks

Thanks man, I should divulge that my car is not a skyline or an S chassis, so I may have more room to work with.. Id really like to see your low mounted gt35 if you were willing to send me a picture. As much as id like to try the G series, I cant seem to find any info on them, which is surprising. I figured of all people, the GTR guys would be all over these. I dont know what they compare to in size to previous Garrets, and I am unsure of what they compare too in response/spool on a 2.6 RB. The output is plenty im sure.