Rb34 / 24U (Rb26 + 800Cc) - Project RB high deck engine (and related builds)

[Ryno]

Also it looks like you've hit some sort of flow restriction (possibly the rear housing as stated earlier) as it holds around the 500 rwkw mark for around 2500 rpm!

What intercooler are you running?

[GTRNUR]

Perhaps down the track a little an EFR9180 with the 1.45 twin scroll will be the way to go to get more top end without sacrificing too much low end. This motor has achieved what I wanted it to do now though. The next two engines are where I'm going to pursue more power.

The intercooler is a genuine Nismo core and is most likely not the restriction, however its had a lot of miles on it and has had some decent stone strikes. It will be replaced most likely with a hypertune core at some stage.

The 6466 will go 550+kw easily if I up the MAP sensor to a 4 or 5 bar. The 525kw was far from being optimised. There was no point tuning it at the limit of the MAP sensor as the ability to detect an over boost situation no longer exists. The 30kw gain from just 2psi shows the engine is still waking up at this pressure level despite the top end drop off.

For the moment I am very happy with the setup. I want to make the car look a little more pretty next, in case someone wants to photograph it.

[GTRNUR]

Video at last!

https://www.youtube.com/watch?v=7-07CnwwmF8

[NYTSKY]

This thing must make boost cranking over lol

[frostyboy]

Sorry this has probably been mentioned before, what is the rev limiter set at?

[GTRNUR]

It is either 7500 or 8000 now. I cant remember and haven't looked at the map since Trent re-tuned it.

[BakemonoRicer]

please set limiter at 10,000rpm

[GTRNUR]

That's the next engine you must be thinking about

[GTRNUR]

I have confirmed the rev limit soft cut was 7500 RPM.

The two graphs on the dyno sheet were actually 4th gear 7500 rpm and 5th 6000 rpm pulls.

The 5th gear run was an aborted run due to an intake hose blowing off. It stopped at 6000 RPM. Trent switched to 4th gear after the hose blew off for the third time, and did the 4th gear pull.

The chart below is RPM vs KW and NM.

Edited December 15, 2015 by GTRNUR

[GTRR34N1]

Any updates you can share?

[GTRNUR]

Nothing real significant at this stage. Ive been driving the car whenever its not raining, which hasn't been that often up here unfortunately.

When doing some maintenance today, I was under the car and discovered I've done a right front CV boot. Grease splattered all over my newly painted TE37s. Such is GTR ownership...

Machining of the next two blocks is coming along nicely. Billet main cams, ARP stud kits and girdle plates installed. Sleeving next week all going well.

[The Mafia]

Hey Mate.. I'm definitely interested in getting one built. I'm in Mackay so not too far away, plus as mentioned in the other thread I have mates you might know.

I'm actually a tuner too. Are you taking orders yet?

[GTRNUR]

Sorry no I'm not taking orders yet, but I can say that one of the two engines being built at the moment will be for sale. That is once we see our first 4 digit power figure in testing.

The price is going to be quite high as it is not a large production run, and also the two builds are being done with no expense spared. Every part is now custom built for huge strength. ARP625 studs throughout, pistons that cost more than a complete rebuild, special coatings and materials, and a couple more experimental refinements.

Here's a sneek peek of one of the bottom end's before sleeving. Steel billet main caps + girdle plate with 12mm studs. I am trialing a Platinum Racing girdle plate on the second engine.

[Stoney85]

Hey Mate.. I'm definitely interested in getting one built. I'm in Mackay so not too far away, plus as mentioned in the other thread I have mates you might know.

I'm actually a tuner too. Are you taking orders yet?

Haha Jono, I see you found him, couldn't help yourself could you.

[The Mafia]

Haha Jono, I see you found him, couldn't help yourself could you.

ahaha yep. I am keen as hell. I would sort this out over 12 months. And this guy looks like he knows his shit. I would rather spend the same money on a RB34 than a RB28

[GTRR34N1]

Anything you can update us on?

[GTRNUR]

Not much to report on really. I'm getting used to driving the car, and have decided I want to fix what is holding back the current setup from making 800+ and having that utterly terrifying top end acceleration. So a few weeks ago I placed a few more orders and now the parts are rolling in.

In the short term I am sticking with the 6466 and have just got a 1.30 housing upgrade for it, to allow the engine to breath better in top end. From what the 3.4lt supra guys tell me, I'm going to notice very little drop in response, yet will gain power that climbs to redline. I'm will be maxing out the injectors too, so another fuel pump upgrade is again in order. I'm swapping out the 044's and am installing a pair of walbro 460's instead, having now worked out how to mount them so they prime properly.

Under the bonnet I've changed the oil separator to a custom Autech style oil unit of my own design. I use a cone at the high end for the can as the vapour outlet, and there is 5 layers of oil separation baffles inside the can, with a return to sump drain at the low side.

On the next two engine front, I have the cylinder head for the lower spec motor now. Ported, +1/+1, Tomei 280/11.5's with supertech valves and springs. I'm still having a hold up with big cylinder head. Parts delays are the worst as they bring projects to a stand still...

[NISR32.5]

Any news on these mate?

[GTRNUR]

40 minutes ago, NISR32.5 said:

Any news on these mate?

Yes some progress has been made.  All parts to complete the next two engines are in the hands of the machine shop awaiting final machining.  If things are completed on time I'll have everything ready to assemble the "insane spec" RB33 next Friday. The RB32 that will follow will be a few more weeks after that.

I changed my business name to Project RB recently too, and dropped open deck engines as none of the new engines are open deck anyway.

I completed a 900km day trip about in the car about a month ago and have been driving every day that I can when its not raining. I believe there is about 16,000km on the new setup now.  The long road trip revealed that my alternator can't keep up with the rest of the higher than normal electrical load in the car, so I've got a 150A alternator upgrade going in soon.

That's about all.  Fingers crossed for no more delays.

[NISR32.5]

Nice work mate. Looking forward to some pictures and updates on the new motors.
Any reason for dropping the open deck design?