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td06-25g on r34 gtt...laggy?

quik180sx

By quik180sx,
in Engines & Forced Induction

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perzn_34 Experienced

perzn_34

Posted
Posted

I've got a td06SH 25g 10cm on my 2b5 with stage one cams and no vct. Full boost is about 4000-4500rpm at 19-21psi (shitty gate spring) and get 320rwkw. it feels bit lag, specially when i snap second and the revs drop a fair bit.

Im thinking of changing to 8cm and also to e85, does anyone know if this is a worthwhile change? how much power and what rev range would i get full boost if i change????

  • 4 weeks later...
Ben C34 Grand Master

Ben C34

Posted
Posted

Thats a massive fail then.

The stock vct gear can be adjusted by removing it, and a mod available to adjust it from the front when still installed.

Being able to adjust it is in no way at all worth losing vct for.

Make vct work again.

Dale FZ1 Veteran

Dale FZ1

Posted
Posted

^^ above comments are a bit of a blind alley. OP wants to know about the response capability of his turbo.

Andrew the spec you are running is broadly equivalent to a Garrett GT3576 in terms of impeller sizing and ballpark airflow capacity if not response/cost/durability. If it is an internally wastegated setup then it is possible your response may not be optimal compared to a reasonably well configured manifold/external gate.

Your figures are a bit rubbery to comment on, although the power figure of 320rwkW on petrol and 20psi is quite respectable (compares ok to a GT35 too).

On an RB25 with that turbo, if you made 20psi at 4000rpm you should be quite happy. If it takes until 4500rpm it's still not crappy but you'd hope for better.

However it is not a bottom-end response type turbo and I wouldn't expect much action under 3000. But it should be very strong across 4000-7500 or higher depending on the camshafts you've got. If there is an 8cm housing available it's likely to choke the thing up high, with maybe a 3-400rpm earlier spool. Not really a win-win,

Check out a TDO6SL2-20G 10cm, or the Hypergear version with their "20.5G" compressor. Sticking one of those on; fuelling with E85 should give about the same max power figure with a whole lot better bottom end response.

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