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Gtr Rebuild - Undecided Need Input :)

RICK-GTR

By RICK-GTR,
in Engines & Forced Induction

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RICK-GTR

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  R31Nismoid said:
261 pages of information.

If you carry on asking RB30 questions then this thread wont be around long as its all covered :P

Even your wildest dreams are in there

my first post still has a question in it wich is non rb30 related, i havent asked any real rb30 questions i was just asking ones opinion wich way they would go. If i wanted to know or seek information on building an rb26/30 then yes i could go to that thread or there is one also on a uk website.

Beer Baron Grand Master

Beer Baron

Posted
Posted

you are not quite breaking new ground here. there are hundreds, probably thousansds of GTR around the world making 450rwkw. they have been done all different ways, RB30, RB31, RB28, RB27, RB29, RB26, Big single, big twins, low mount twins, low mount single, ball bearing single, in 32, 33 and 34 GTR.

And you ask anyone who has a reliable, and healthy 450kw and they will tell you $20K to get the ball rolling and then up to another $10K to make the package really nice. don't forget a 450rwkw car needs some good brakes, needs some good suspension, need a decent fuel system, need a big radiator, needs a big intercooler, needs good tuning (and lots of time spent on doing it), need a good igntion system, needs an engine built by someone who knows what they are doing, needs some smart oil control mods, needs a gearbox upgrade, needs good tyres, needs good gauges. it needs money most of all. it doesn't matter if your mate is a top mechanic and engine builder. my best friend is a engineer and mechanic who runs his own shop and has for year, doesn't mean i'd expect him to build me a motor for free.

450rwkw is an admirable goal in a GTR, but it's a shit load of power and needs a serious wallet to back it up.

there are a few guys on here with 450rwkw+ i'm sure they will tell you some tales of cost vs benefit.

you will find lots and lots of guys between 250 and 300rwkw. not a lot of cost to get there. then some more guys with 300-350 kw (quite a lot more cost than the 300 guys) then a few more who've gone the extra little bit to 350-400kw. but there are even fewer sitting at 450kw and hardly any at 500rwkw. there is a reason for it. the cost grows exponentially and the enjoyment sometimes doesn't as the car becomes less usable, even on the track.

R31Nismoid Grand Master

R31Nismoid

Posted
Posted

How many beers did that post take?

I concur 150%. Spot on the money as usual.

Id also add, doesnt even matter if your mate can build motors. Building reliable RB's is an art.

There are key things that need attention that are not "standard" detail items for your "every day" rebuild. And you wont know these things unless you've put together many RB's in the past as you gain these things from knowledge of the motors themselves. Seeing them fail, working out why and then improving upon that.

You can be the best motor builder in your state, doesnt mean the RB built will last the distance if you dont have excellent knowledge of them.

rev210 said last week i think RB's cost a farken fortune to rebuild right, and he isnt wrong

wrxhoon Grand Master

wrxhoon

Posted
Posted

Some good advice in above posts and I will add from experience here, go the jap stroker kit you will not regret it but you may end up with a cracked block if you use a standard 5u block with that much power . If you are looking for anything above 300-350 awkw ( genuine, not just in number) you should use a better block , a 24u or even a RRR block. Unfortunately they are hard to find and very expensive.. If you want over 400 kw you should be looking at a gearbox and clutch at the very minimum . Now you can see that high powered GTRS are bottomless pits .

sewid Grand Master

sewid

Posted
Posted

I was reading through and thinking to myself I'd want $30k to do this properly but Beer baron has already said it.

It's not like you can shop around for some of the parts, like wrxhoon has mentioned a 24u or a GT block would be better than the standard or rb30 block and you basically are over a barrel trying to source one of those.

wrxhoon Grand Master

wrxhoon

Posted
Posted
  sewid said:
I was reading through and thinking to myself I'd want $30k to do this properly but Beer baron has already said it.

It's not like you can shop around for some of the parts, like wrxhoon has mentioned a 24u or a GT block would be better than the standard or rb30 block and you basically are over a barrel trying to source one of those.

Mick has spend $30k and it cost him zero for labour !!! You are right you can't buy N1 or GT blocks, even the days that you could you would be paying $3-$4 K for N1, much more for the Nismo GT.

You can always try to cut corners then re-do the whole thing again. Sometimes you don't even cut corners and you still have troubles .

Cubes Grand Master

Cubes

Posted
Posted

If you are looking at the RB30...

Factor in the sump adaptor, rev reliability issues that require a good balancer + full length oil pump drive.

Then consider... Who has done it in a 33GTR?. The R32's have bonnet fouling issues unless you lower the subframe and engine mounts. The R33's 'may' or 'may not' have this same issue.

Spoolup does a set of RB30 CP forged pistons & rings with spool forged rods for 2k.

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