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  • 2 weeks later...

I'm currently doing a single turbo conversion on my GTR with a 6262. What have people done with the water lines since these turbos don't need them?? I'm trying to figure out best solution.

So the one coming from behind the head connected to the one from the front?? I'm a bit lost here not much info out there.

How about the one on the block down the bottom, just block that one off?

Mate finally bit the bullet and is ditching his GT3076R for a 5858 on his R34 Gt-t, was making a touch under 500 before so I'm guessing it will bump up to around 550 with not too much more lag

Went in for a tune last night. 525rwhp on 1.4bar and 555hp on 1.6bar before it started having valve spring issues top end. Higher boost looked like it was heading just under 600hp with 1.8bar.

Boost comes on around the same as the 3076R but makes a bit more power earlier (200rpm in lower range when ramping boost) and makes an extra 70-90hp on the same boost through the mid range and top end. Overlay with the T67 on my old green car and they were very similar but the 5858 will smash it with the valve springs sorted and some more boost.

Forgot to get a graph printed (will get one when valve springs are done) but it's probably the best mid size turbo I've seen on a RB25

TLDR; Comes on earlier and makes shit loads more power than a GT3076R

Edited by SimonR32
  • Like 4

Awesome results. I thought the 5858 would be laggier then the 3076 by miles and that the 5558 would be a closer match. Apparently not!

Im guessing .82 rear? BB version?

Technically boost builds a little slower on the 5858 but I guess it's flowing a bit more air so more power down low. Owner says it feels better low down on the road than the GT3076R as well

Yes and yes to the other questions

Edited by SimonR32

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