Mik

The standard one may be okay for power, but with the standard plenum, more air is distributed to the rear cylinders which means an unbalanced engine and leaner mixtures on the rear cylinders (if you tune with one O2 sensor). Hence why RB26's tend to always do ring lands on number 6, rather than one of the front cylinders.

Nice and rich. Looks good nick.

Did you use the ACL mains?

An oil restrictor will increase pressure, not drop it!! It sill restric volume, not pressure! If you mean the pressure in the core itself will drop, then yeah it will.

The AFM they 'sell' is a nissan one., and they don't try to hide that. It is also prices the same as the genuine nissan part. The fuel pumps and fprs are the same as nismo ones, and I'm pretty sure a tomei fuel pump is cheaper then an OEM nissan one. They do share some parts with nismo (cranks as well), but nothing with OEM nissan that I know of (actually, I suspect that their type A valve springs are OEM nissan) The bearings are definately different. Whether they are any better or not, I don't know. Clevite SR20 big end bearings are also identical to nissan (NDC) but have a different coating. This could be where the tomei ones are sourced from.

What???

The ACL big ends are 2960's...same as sr20. Interesting about the bearings being in the nissan wrap. I'm just going off what my supplier in Japan told me...he said they are the same bearings with a special surface finish. If you get really stuck with the big ends, I can send a set over.

Hey Pete, I thought I told you that? Or was it someone else? They are not quite the standard Nissan NDC bearings. They are treated. (That's what the micro finish buisiness is about). ACL reace big ends are damn cheap, that's what I am using. Why don't you give them a go? I'm not too keen on their mains though. Mick

Thanks...another question. The nissan standard RB26 big end oil clearance is 0.0008"-0.0016". Realistically, will a clearance of about 1.2-1.3 thou be too tight? Would an extra 1/2 thou be better?

So, it's okay to use one HX shell and one H shell on the same conrod journal (to give 1/2 thou extra cleanace)?. Will the missmatch at the parting line cause issues?

What is the bore size of the block? Is the crank BCNR33 or BNR32?

The normal or the 'Pro' (type B) kit were the same price last time I checked. They are about 400,000JPY. The diff between the 2 is that the type B kit gives more variance of the lobe centre, but you need to run pistons with valve relief. Also, the kit isn't made for big power because you can only run low lift cams.

I'm 99% sure they are IHI. IHI turbos are Japanese though. IHI stands for Ishikawajima-Harima Heavy Industries. Pete...what sort of RPM were you seeing max torque with the 2560Rs? In all honesty, once my car was sorted, I found the GTRS's to be quite good on the stock engine. I was seeing peak torque at a touch under 5000RPM. In a few weeks, I will be able to tell you what they are like on a fresh engine.

Yours would be King RB30 bearings which alot of poeple have used in RB26s (you need to drill holes in them though).

King do not make bearings for the RB26. They do make for the RB30, but these are a 19mm main and you need to drill holes in the upper shells. ACL do make RB26 bearings, but they have made a mistake, and made them 19mm instead of 20mm (they copied the wrong sample). Nismo offer mains (they are the same NDC brand as OEM ones). and are supposedly a bit better. Tomei and NISMO offer big ends, never seen a Tomei bearing though. Also, the N1 models use the same mains as the normal GTR's (nopt sure about big ends though)

They are actually based on IHI units. I also have a feeling that the Z-tune uses one of these 'Tomei' turbines. Tomei and NISMO have so much gear in common now. The Z tune crank is the Tomei crank, FPRs, fuel pumps, and a few other things.

Did you spin a big end or a main? What sort of bearings were they? The reason I ask is that I have a set of ACL race bearings supposedly for an RB26, but the main shells are only 19mm.

I have heard of a lot of people using RB30 main bearings in RB26 engines. I know you have to drill 5 holes in each upper shell, but also the RB30 bearings are 19mm wide and the RB26 are 20mm. Does this cause any issues?

It depends...I know of a car in Sydney that made at least four 10 second passes with no cage.

I think you will find (and I may be wrong), that the HKS step 1 kit does not come with conrods, the kit uses 121.5mm rods, so you use your old ones. Also, all 3 cranks (step 1, 2 and 3) are different, but I believe they are all 12 counter types. The Tomei RB28 kit includes Arrow rods but uses an 8 counter crank (from the Z tune)

Yep...definately 20...and you should be able to get way more than that. Are the keyways on the cam and CAS still good? Try remove the CAS and inserting it in a different orientation.

Did you replace the CAS with a new one or second hand? Sometimes the little half moon locating key way in either tha cam or CAS breaks, meaning that the CAS can be inserted in the wrong position.

Hey Paul, I am running the same size and pattern tyres. I fournd no differecne between about 38psi all round and 30psi all round...you might as well just leave them at 38.

They are on every wedensday night now Paul

They are no different to any other vspec II