Bolting R34 Op6 To My Rb20 Redtop

[Kaze21]

Hi iv recently bought a r32 and decided to throw on the r34 turbo on that i had sittin in the shed.

I spent a few hrs getting the old one out and swaped over the waste gate to the OP6 and got it in there after swearing and cursing for about 15min,

bolted it to the manifold and decided to start on the water and oil lines, i then realised the banjo bolts for the water lines are too small so i jumped on the net to find out the thread pitch for the banjo bolts and also found out that i need the oil line from an r33 for the oil restrictor.

what i want to know is if the restrictor is absolutly nessacary, also is the restrictor in the line or in the banjo?

[GTSBoy]

From all reports the restrictor is in the line. And yes, you need a restrictor. Too much oil flow not good for rolling element bearings.

[Kaze21]

Does the redtop rb20 have the restrictor? Iv just asked one of my local performance mechanics if I will need the r33 lines and all he said was that all bb turbos have a restrictor and I shouldn't need one

[GTSBoy]

I can't remember if the red top used a BB turbo.

[niZmO_Man]

Redtop is too old for factory ball bearing turbo.

[GTSBoy]

That's kinda what I was thinking. I never cared enough about them to bother remembering. On that basis...there shouldn't be a restrictor on this car unless someone has had an R32/3 turbo swapped in at some stage.

[Dobz]

From memory the R34 turbo has M18 threads for the water lines and the R32 water lines are M16.

The option that may cost a little more but is by far the least hassle is getting an M16 helicoil. You don't need the whole kit just the coil that goes in the thread because the tapping size for the M16 helcoil is M18 size anyway. Just use a set of long nose pliers to wind it in and break off the little tang.

You can pick them up from any good bolt shop or engineering supplier.

As for the oil line, look inside the banjo that bolts to the block. If it has only a very small hole in it then it would be ok, if its a big hole then you need an oil line from a later model motor.

[Ben C34]

r34 turbo water lines are m18x1.5

not sure the helicoil trick would work, probably only works with the coarse threads.

Edited June 23, 2013 by superben

[Dobz]

r34 turbo water lines are m18x1.5

not sure the helicoil trick would work, probably only works with the coarse threads.

The R32 water line thread is also 1.5mm pitch. You can get helcoils for that thread diameter and pitch.

I forgot to mention the pitch earlier sorry.

Edited June 23, 2013 by Dobz