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

GTRNUR
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GTRNUR
GTRNUR

Quick Update. I finally got a weekend off work and was able to visit a Springmount Raceway, which is a new drag strip that was built and 1.5 hrs drive from Cairns. I only ended up doing two

GTRNUR
GTRNUR

There has been big developments with the project.  Towards the end of June I completed and delivered the rebuilt RB33.  It has been run a few times and initial indications are that it should perform v

GTRNUR
GTRNUR

Update Time! Its been a long road to get here, but I finally have some test results for the engine. Last weekend Trent Whyte and Gordon Leonard from Mercury Motorsports jumped on a flight to tune my

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Stoney85 Collaborator

Stoney85

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Amazing results, credit to you and your research.

If you don't mind me asking, What is your daily job? Do the skills from that job help you at all in the design and build of this motor? Or is this solely an enthusiasts desire to get the best results possible?

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GTRNUR Grand Master

GTRNUR

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I do computer/network management and programming for a living. For the past 10 years I have been primarily supporting engineering firms. From that I have had a lot of exposure to engineering principals, CAD systems and CNC. As well as engineering support from some very clever people.

Add to this that I have been building engines of various kinds since before I could hold a license.

I've decided to get a set of Supertech valve springs for this current engine to sort out the valve float issue, and hopefully punch through that 500kw atw limit. Then maybe also a switch to an EFR 9180 as well.

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g_dubbya Newbie

g_dubbya

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Truly epic thread here! So thorough and well thought out.

A pleasure to read it from start to finish. If/when you make this a "kit" I can only hope I'll be in a position to get a setup like this for my 33 GTR.

Keep up the great work.

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  • 4 weeks later...
GTRNUR Grand Master

GTRNUR

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Thanks Dan.

Not much to report other than that I am going through E85 like no tomorrow. I must do a video of what the car drives like. There is a little maintenance to catch up on, needs a wheel alignment and balance, but other than that its still going strong.

Yes its still a stock getrag for the moment. Basically I'll drive it like this until next year some time when it will get an OS88. The drag strip is still being built, so I wont be breaking the getrag anytime soon.

The main focus is on the next two engines now, which will hopefully be finished around November.

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GTRNUR Grand Master

GTRNUR

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These next two engines are about stress testing the design. Both are being built with a 1000+hp power goal in mind. No expense spared, with a focus on maximum strength for all components.

Once testing has proved the design holds up for the first engine, the second will become available as the first to ever be sold.

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  • 3 weeks later...
GTRNUR Grand Master

GTRNUR

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I am still in the process of getting the final parts made for the next two engines.

One of the two cylinder heads is ready to go. Ported, oversize valves, 280x11.5 cams, dual springs, the works. The second head is still being made, and in comparison it makes the first one look like stock. I am told it will flow past 1kw with ease.

Two crankshafts have been completed and are ready to install. One 87.8mm and one 89.8mm, both with 19mm GTiR journals and clearenced for oil squirters.

Two N1 24U Blocks are now partly composite resin filled, and are about to be sleeved and fitted with girdle plates and main caps. Then onto final bore/hone machining once the pistons arrive.

I am hopeful that I will be assembling engines early to mid December.

Edited by GTRNUR
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  • 1 month later...
GTRNUR Grand Master

GTRNUR

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I am still waiting on pistons for the next two engines. It took quite some time to get the specifications sorted out for something that will handle extreme punishment for an extended time. In the end I went with a custom JE and Trend DLC coated gudgeons. I'm told they will handle 1800hp+, with a specification normally found in a methanol engine.

I completed the rear R35 GTR brake conversion, and have a functional hand brake thanks to modified Toyota Rav 4 hand brake shoes.

Other than that I have been working on the front suspension lately. I've changed the lower control arms to R33 GTR items, so I can use adjustable tension rods. I've yet to locate or make a set of roll centre correction spacers. Upper arms will be fitted with superpro offset bushes to correct camber.

I've also done the first plug change and compression test since the tune. Dry test and every cylinder is within 3psi, which is amazing. The best leak down and pressure test result I've ever had. Then I re-pressure tested the entire intake side of the engine and found the reason I didn't break 500kw in the last tune session. At some stage between the first and second tune sessions, a weld had developed a small crack in a pipe that links the turbo to the intercooler. So essentially I made 610hp with a serious induction leak. I've had to turn off boost control now too, as it hit boost cut on the first drive once the leaks were fixed.

I believe the leak was in part due to a mostly torn through nismo engine mount, as there has been other signs the engine has moved a little too much. I was blowing off pipes during dyno tuning, but also, the plenum has made contact with the clutch master cylinder at some stage.

I changed my first front inner CV boot too. What a fun task that is.

That's all for now.

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  • 1 month later...
GTRNUR Grand Master

GTRNUR

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Update time!

Today truely a great day. With the boost issue fixed Trent from Mercury Motorsport was able to get the engine to perform as I had hoped, and we finally got the 500KW ATW goal.

We had a couple of minor issues with blowing off intercooler pipes again, but other than that the car performed flawlessly.

Huge thanks to Trent @ Mercury Motorsports and Daniel Stephensen from LK motors for performing all the tuning and dyno setup.

526kw atw at 28psi (pipe blew off in this run).

495kw atw at 26psi

33 degrees, 82% Humidity! Stinking hot!

I never saw hotter than 86 degrees on the MFD, (Oil and Water)! My cooling sytem rocks!

post-26553-0-77984400-1449994692_thumb.jpg

Edited by GTRNUR
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