What Cams To Run On My Rb26/30dett Gtr Build

[Marko R1]

hi guys,

i will be running garrett -10's for my new rb26/30 build & have been researching cams & what would be best...after talking to a few guys in the 'know how' the recommendation has been 270-272degree with 10.5mm lift (IN/EX)

some have also stated tomei poncams are good for my application BUT i dont want to fall short of my goal @ 400+awkw due to wrong cam choice

i was told to stick with the tomei range as they carry the same base circle as stock cams, is this the case as i want to get away with just cams & springs (my engine builder stated this is the way to go)

...besides, tomei seems to be significantly cheaper than hks or jun

regards

marko

[Angus Smart]

anything with more lift that 9.15(i think) in tomei you need to buy buckets/lifters aswell. +500 bucks..

[Marko R1]

anything with more lift that 9.15(i think) in tomei you need to buy buckets/lifters aswell. +500 bucks..

can anyone confirm this?

if this is the case where i need buckets/lifters for anything over 9.15mm im looking at approx. 2k+ in parts for my head (cams, springs, retainers, buckets, lifters)

maybe i should stick with tomei type b poncams - then the question is "will this get me to 400awkw with head porting?"

[Swiper the Fox]

can anyone confirm this?

if this is the case where i need buckets/lifters for anything over 9.15mm im looking at approx. 2k+ in parts for my head (cams, springs, retainers, buckets, lifters)

maybe i should stick with tomei type b poncams - then the question is "will this get me to 400awkw with head porting?"

it will get you 400kw without head porting Marko.

My old near stock 26...467KW...2530's...260 9.15mm tomei poncams.

This was the old engine that was all Nissan except pistons, rod bolts and camshafts.

Pick your rev limit and buy the biggest lift cams for that duration. Any cam with a BC smaller than stock will require shims and or thicker buckets and or offset retainers.

Who is building this engine??

Shouldn't you be directing your questions their way??

[Angus Smart]

Its 9.25 max on standard lifters with tomei cams.. tomei's website confirms this.

[Marko R1]

it will get you 400kw without head porting Marko.

My old near stock 26...467KW...2530's...260 9.15mm tomei poncams.

This was the old engine that was all Nissan except pistons, rod bolts and camshafts.

Pick your rev limit and buy the biggest lift cams for that duration. Any cam with a BC smaller than stock will require shims and or thicker buckets and or offset retainers.

Who is building this engine??

Shouldn't you be directing your questions their way??

i did talk to my engine builder & he suggested that i confirm what he believes which is that i would need only the cams, springs & retainers

if i go with approx 270degree cams what are my options if i stick with the same base circle. my findings was that only tomei offer the same BC?

interesting about tomei poncams - yrs ago when i had my aust delivered gtr with poncams (260) & gtrs kit it made 362awkw @ 22psi, the new owner fitted bigger cams & cracked 430awkw @ 28psi

[Swiper the Fox]

i did talk to my engine builder & he suggested that i confirm what he believes which is that i would need only the cams, springs & retainers

if i go with approx 270degree cams what are my options if i stick with the same base circle. my findings was that only tomei offer the same BC?

interesting about tomei poncams - yrs ago when i had my aust delivered gtr with poncams (260) & gtrs kit it made 362awkw @ 22psi, the new owner fitted bigger cams & cracked 430awkw @ 28psi

Your engine builder asked you to confirm what he believes...is he for real?

made 60kw more with cams...but also 6psi more boost, id say a higher rev limit, different fuel, different dyno operator and probably different atmospheric conditions. Not really that surprising.

Edited April 6, 2009 by DiRTgarage

[Marko R1]

yep - he builds engines for all applications (predominantly drag) & other makes as well (hemi, chev, nissan etc)

[Angus Smart]

260 degree 9.15 lift would be the largest duration you can go without changing the lifters or the other way with shimming??

that is from tomei again..

Whod you end up going with the engine build? pm me if you want to keep it provate or whatever?

Edited April 6, 2009 by Angus Smart

[Marko R1]

im looking at either harris engines (revesby) OR st marys engines (st marys)

im leaning towards st marys engines, good work & very competitively priced...who were u looking at?

i need warranty & receipt for tax purposes

[Marko R1]

so what is the general consensus with cams, i.e. if we compare tomei 260's/9.15mm to tomei 270's/10.5mm:

what would be the difference in peak power approx?

im guessing the 260's will provide better midrange?

bang for buck?