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My Rb26 Build

MJTru

By MJTru,
in Engines & Forced Induction

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MJTru Mentor

MJTru

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So i want 600 hp to the wheels. By today's standards that's not much. I do all my own work from home. After I was given a r32 gtr I found out the car was totally rotten, so I pull the motor and installed it in a gts4 I had. Made my own down pipes and did the work with a close friend of mine.

After all was install in short the motor only lasted like 15 minutes before the bearing where all mest up. After I pulled the whole engine down. I noticed that this motor had HKS 272 with stock lift cams in it. It was fully stock but for those cams. Internally speaking here.

So we pulled it out and made a list of parts that we will need. Over here in the states nissan cranks has been on back order for that last 6 months. It's now here so I went ahead and ordered an oversized sump from racefab. Rod will have it out to me soon. I'm looking forwards to that.

In addition I got a 1.1mm Tomie oil restrictor and a head drain along with a tomie oil pump. Along with a long with rods and pistons ACL bearings main and head studs MLS head gasket and a new nismo n1 crankshaft along with a new cylinder head a set of valve seals cam seals with rear main seal supertec valve springs and titanium retainers.

As for the head it was fun reading up on what I needed to do and doing it. I did all the head milling myself. I didn't open up any of the ports I just cleaned the up. The ridges that was left over from machining the valve seats. In short I made it all have one smooth flowing surface to reduce turbulence on the back of the valves. Next was the one mod the i was torn over should the humps in the exhaust port go or stay. I made my mind up measure the thickness if it was removed on the old head first. I found that it's the same size as the everywhere else and went ahead and took them out. This was mainly after I read an article about rb26 head mods and if using aftermarket turbo manifolds they recommend taking those out.

I'm using all stock valves and slap seat them myself. I took measurements for shiming the lifters and new to make some adjustments. One of my big concerns is my HKS cams. They are 272 with stock lift. I feel these cams are to big and from what I've read on this forum no one really got good results using cams. Well at lest for what I want to do.

So now that you know a little bit about my build this is what I intend on do with the car.

Drag racing it that's it. Home and track. Never what to drive it on the road or nothing. I was told it a good set up because it's in a gts4's body and the diffs are going to favor the gtr gear box. Somthing about being shorter. ??

In the future I'm planning on replacing both front and rear diffs.

Thanks mate

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KiwiRS4T Grand Master

KiwiRS4T

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Front and rear diffs on GTS-4 are 4.3 (as opposed to GTR 4.1)so may be better for dragging. You may benefit from a LSd centre for the front - don't really know much about drag racing. Have a read of the "over 400kw" thread for some more ideas. There is a trend to single turbos (especially for drag racing) so have a read of the borg warner and precision threads. I got the impression 272 cams were good for drag racing but not much else but I would have thought they would have more than stock lift. How much lift do you have? Assuming you are going to run on pump petrol you will need at least ID750 injectors or better. Plus a surge tank and some decent pumps.

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MJTru Mentor

MJTru

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Thanks mate.

I was planning on doing that as well. It's been a while but now my oil pan is on the way and the crank just arrived. I'm ready for the actual build. I'm planning on running 850cc injectors from sard and I'm using the D Jetro PFC. I can't remember but it's the one with map sensors. I'm planning on running NOS. Do you know what would be the best piston ring gap for that in standard bore and forged CP pistons.??? I'm hoping it will be listed in the spec sheet of the pistons.

I'm also planning on running a 1500hp external fuel pump just cause I have it.

You mention center diff. Sorry but I don't know notjing about that. Does that go in the gear box?????. And as for the cams it's hks 272 at stock rb26 lifts, but I really think they will hurt my power numbers vs. The stock ones. I feel old if my hp goals were over 1000hp is when it would help. I've heard to much about cams being the cause of people losing hp.

Thanks for your help mate. Any one else.

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KiwiRS4T Grand Master

KiwiRS4T

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I didn't say centre diff I'm talking about a LSD centre for the FRONT diff - Quaife are popular although there is probably a Nismo, Kaaz, or Cusco unit to suit.

If you haven't already got the Sards ID injectors from the US or Australia will probably be a cheaper and better option.

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