Twin Scroll Vs Single

[Lithium]

Quite a different way of doing it, mixed long term reliability results for them but SP and a like of the Supra guys stand by them. Be aware that if comparing with the QSV on vs QSV off results published - that is comparing the performance a dual entry turbo on a single entry manifold (ie, a shit way of doing it) with the QSV behaviour, a PROPER single entry turbo on a single entry manifold, or even better a fully implemented twin scroll setup will perform substantially better overall than the "QSV off" scenario these guys will be showing.

Just IMHO, but worth considering I reckon.

[eXquiSit]

following your comment lithium, it would seem that a twin scroll manifold mated to a single entry turbo would be detrimental to performance? is this correct?

[scotty nm35]

Actually due to the smaller merge it would increase the gas speed and improve response, you would probably get the best outcome that way imo, especially if mated to a gate off the housing or getting a decent angle on the twin gate pipes.

Extending the split further into the turbine housing, past the T3 flange and tapering it would help too.

[AngryRB]

I don't think you get better gas speed at all, not on a streeter, atleast not with the 6boost low mount I had, the pipes diameter and length and the merge collector were way bigger than a stock manifold. The merge looks massive to me, too big...

Ryno's comment about a 1inch runner diameter sounds most effective to me based on my short experience.

Maybe you could weld a tighter collector into a v band to raise the gas speed for response????

Edited March 9, 2015 by AngryRB

[GTRPSI]

Hmmm, so you want faster gas speeds to spool up quicker right?

Run the smallest diameter runners on the manifold, as you can, for the power your producing.

But just remember as the power levels go up, you will need to increase them to flow enough so they are not a restriction.

Some of the better manifold builders ask for a power goal so they can select the best runner diameter to help. Something up to 800Hp has smaller diameter runners than something producing 1200Hp

Running a big runner manifold for a lower power build is as bad as running a smaller power manifold on a big power turbo.

Bigger is not always better.....