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Hks Gtr Cams Into R34 Gtt

drgnball34

By drgnball34,
in Engines & Forced Induction

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drgnball34 Rising Star

drgnball34

Posted
Posted

I have been told that it is possible to use GTR cams on a NEO. Similar solid lifters although can not use any lift higher then approx 9.5mm. Im planing to go down this route couple with adj cam gears. May sound like a silly question but could i then use the RB26 clear cam cover?

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ovabooster Collaborator

ovabooster

Posted
Posted

more to the point... if i disable vct, can i completley remove the vct solenoid off the inlet wheel? Will be using tomei poncams 260 and adj inlet and ex cam gears. I want to dress up my engnine and use a rb26 clear cam cover..

cheers

RB30 Ceffy Enthusiast

RB30 Ceffy

Posted
Posted

only way you can use that clear cover is if you get the backing plate to bolt it too. It also wouldnt look very good in my opinion without the rb26 valve covers too. But they do look a hell of a lot better!!!!! The valve covers bolt right up.

Cant anwser your question about the vct tho. I know the cams can go in but not sure about the vct wheel on the cam itself. I think they seal differently from the 25 and 26 cam shaft but I havnt dont that modification so best to call that workshop thats done it many times posted above.

ovabooster Collaborator

ovabooster

Posted
Posted

finally got around the prob with my cam choice. Will use GTR tomei poncam 260 and disable VCT. This way i can remove the hud off the stock inlet cam gear. Will the rb26 clear cam cover then bolt onto the NEO? Or will i still need GTR rocker covers????

discopotato03 Grand Master

discopotato03

Posted
Posted

Don't forget that GTR's have the 6 throttle valve inlet system so they can and do get away with greater valve overlap without the choppy reversion characteristics . So between having virtually zero inlet communication at idle and low turbine inlet pressure from the twin parallel turbos they can get away with longer duration cams and the extra overlap to help them scavange .

A Neo RB25 with its single turbo (greater average turbine inlet pressure) and single throttle plenum inlet manifold may not take very kindly to GTR cams .

Your call , cheers A .

ovabooster Collaborator

ovabooster

Posted
Posted

thanks for the heads up....interesting food for thought...Brad from spool imports is using GTR cams for his NEO 25/30 and from the looks of his dyno graph....great results. Some 508rwhp on a low 20 psi TO4Z....I would think depending on the duration, lift and adj cam gears, this may have attributed to his success??? From memory his were 272/9.35mm

  • 3 weeks later...
RPMGTR Community Regular

RPMGTR

Posted
Posted
i was told from my workshop that the NEO head has only 12 solid lifters. I have a spare NEO head and was also told that abit of cost is involved in getting the spare 12 on.

Best you find a better workshop........The NEO definately has 24 solids !

The inlet lifters are a little different to the exhaust lifters, but they are both solids.

cheers

drgnball34 Rising Star

drgnball34

Posted
  • Author
Posted
ok just out of interest you can put a full set of 26 covers on your 25?

just get the backing plate for the cam gear cover and it should all work?

Yes that is what i have been told and i hope that is correct becasue i have just purchased a set for $395. On another note there was a misunderstanding between the workshop. NEO do have 24 solid lifters although 12 are steel and the other 12 are aluminium and the inlet and exhaust are different . My goal is to combine the other spare 12 steel onto the same head. What modifications is neccasary??? eg: inlet lifters into exhaust and vice versa?

Abo Bob Grand Master

Abo Bob

Posted
Posted

They are too different. The valves and springs would have to be different lengths. I am looking at the two of them right now. The exhaust valves seem to be shorter or perhaps recessed further into the head.

Yeah the 26 covers fit onto the 25's. I've seen it done before.

drgnball34 Rising Star

drgnball34

Posted
  • Author
Posted

really huh? Sounds major....The head is getting sent to enginering once my cams arrive. i hope there is a possible way around it and not have cost sky rocket at the same time. Is there anything even wrong with aluminum lifters anyway? It has a rb30 bottom end reving to 8k rpm max although power goal is 650rwhp...

cheers

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