Bubbles money pit

[Stuart]

120 degrees!! Jesus Geoff, no wonder you need to cool things down. I'd be fascinated to see the results of the work with the improvements you've made

[Bubble]

120 degrees!! Jesus Geoff, no wonder you need to cool things down. I'd be fascinated to see the results of the work with the improvements you've made

I have previously hit almost 130 degrees, which is reckoned to be the limit of Silkolene 10W/50 Pro S

I have a trackday @ Llandow in Wales on Friday, so I will let you know the results. I also have an ally radiator coming too, which should reduce the engine temps further, but I want to do one mod at a time and judge the results

[Bubble]

With the new 34 row oil cooler, the temps maxed out @ 110 degrees and that was on the small Llandow circuit where the top speeds are fairly low, but you are on the gas a fair bit of the time. The K-Sport 8-pot brakes were superb, with not a hint of fade or judder all day. I took a couple of guys out for passenger rides and they couldn't believe how late I could brake :lol:

With spirited fast road driving the maximum oil temps are around 15 degrees lower too, so I am happy with that

[Bubble]

I thought that it was about time that I updated this thread. Things have not gone to plan and the RB30 & T04Z have taken much longer than we first thought to install.

A friend of mine (Ben) had his car collected by Rising Sun Performance for a similar conversion before mine and the plan was to duplicate more or less everything that was done to Bens, for mine.

I specified some extra bits and bobs, so they were never going to be identical though. While Bens was being done, my GTT had a dummy RB30 installed, so as to get ahead with the manufacture of the custom front pipe and screamer pipe return. The new 120mm deep:eek: front mount intercooler was installed and custom pipework made up to fit.

All the pipework was sent off with Bens for polishing to save time, along with some other parts too.



The T04Z just fits below the strut brace



Once again, I specified that the external Tial 44mm wastgate screamer pipe was to be plumbed back into the exhaust front pipe. It has a flexi section to allow for heat expansion and vibration etc. This section will not be fitted for normal road use, but it will have to be on there to keep the noise down for trackdays.



I bought another NEO cylinder head so that I could keep the old engine intact as a complete unit and here it is fitted to the RB30 bottom end. Oil feed line to the VVT to keep the variable valve timing functioning too. There are also restrictors in the block to stop too much oil flooding the top end of the engine, which is a common RB problem with high revs.



I specified an oil drain from the back of the head to return excess oil externally back down to the sump pan. This has been a time consuming exercise, as the original fitting fouled the transmission tunnel the the engine couldn't be fitted. Another fitting was sourced after a couple of days and the engine and box went in. But the clearance was still very tight and it would have entailed the engine and gearbox being taken out as one unit if there was a problem with the clutch

So another smaller fitting was sourced and now the gear box can be taken out independantly. Apparantly the transmission tunnel is different on the GTT and there is more room on a GTR.




I didn't fancy a rattly binary action tripple plate clutch and after doing some research and on the good advice from Rockabilly (Bernie) I bought a NISMO Super Coppermix twin plate clutch. I could have saved a chunk with a cheaper ORC, but as the GTT is my daily driver, I wanted something that wouldn't be a pain in traffic.



Work in progress.........



Custom oil catch tank and just about everything done now

I got a phone call while I was at Japfest from Richard Bell and heard it running for the first time It has done about 100 miles on the dyno already :thumb:

There are a couple of problems still to overcome though. There is a small exhaust leak from the exhaust front pipe, which will be sorted out on Monday. Oh and the bonnet still wont shut.........every time I ring up RSP for an update on progress, I ask yeah - but does the bonnet shut :lol:

If you see an R34 with a scooby bonnet scoop, you know it's me

[Stuart]

Very nice standard of work there Geoff. Thanks for the update, I presume you'll be taking custody of this sooner rather than later?

You'll have to give us the lowdown on how it drives in comparison to the old 2.5 with lots of glorious details

[Bubble]

All being well, I will go and collect it tonight. Then I have to do 400 miles before another oil change, then another 400 and it's mapping time

I will post up the dyno graphs as soon as I have them and let you know how different it is to the RB25

[Bubble]

Very nice standard of work there Geoff. Thanks for the update, I presume you'll be taking custody of this sooner rather than later?

You'll have to give us the lowdown on how it drives in comparison to the old 2.5 with lots of glorious details

The dyno chart is now up in the relevent section, it made 675bhp / 574lbs at the flywheel @ 1.5bar

Off boost it is so much better and refined to drive, just like a big engined naturaly aspirated car. When the boost builds, it gets a bit manic and by 5000rpm it's insane. You can feel the rear tyres slipping in fourth in the dry. Fith gear is so impressive and just pulls and pulls. There is very little boost drop off in between gear changes, unlike the old RB25 with the TD06 turbo, what a difference another 500cc makes.

I had got used to the 500bhp that the old set up made, but this is so.......so....... much quicker, it's a bit scary and certainly commands some respect. I allways told Rising Sun Performance that I wanted power that would scare me, well Richard you have done it. It is truly amazing, stunning, intoxicating, I'm blown away 8)

Just need to upgrade the driver now

The car is mapped with a flat torgue line, to make it less peaky to drive and hopefully be kinder to the standard gearbox and drive shafts and not a wheelspin inducing peak figure.

[JonnyR]

Mate, thats an impressive build and an awsome soundtrack on the video, theres something so special about that second before a skyline launches.

Very nice mate, well done.

[tomcat]

near 700bhp must be scary on the road - very impressive

[duncan]

Wow.

(cant say much more than that )