Turbo "shuffle" With Big Twins On Stock Manifolds

[Chris Wilson]

Some of the bigger twin turbos on stock manifolds, on the RB26 engines give rise to shuffle. Some say it's curable by a balance pipe between the 2 exhaust manifolds, but I want to stay with STOCK manifolds. I have also heard that this shuffle is really caused by the AFM's getting reverse, or pulsating air flow at some load / RPM levels. My question is, do people get shuffle on engines with a decent aftermarket ECU, like a MOTEC, well mapped and using a MAP sensor, and NOT AFM's, on stock cast iron exhaust manifolds?

[R31Nismoid]

What turbos are you talking?

What power? etc

[Chris Wilson]

What turbos are you talking?

What power? etc

The big HKS stock mounts, for example, I can't recall if thsy call them RS or SS. Basically I am wondering if this "shuffle" on the aftermarket large stock mounts can be dialled out by NOT running MAF sensors, and running a MAP system. Probably talking 600 'ish flywheel HP.

[R31Nismoid]

Well you can make 600hp @ the fly with HKS 2530's (or equivalent Garretts etc)

And they dont suffer from shuffle/surge at all, id say the most common upgrade for RB26's... so your question kinda is cancelling itself out Chris being you shouldnt have that problem with your power goal (if the turbo choice is right)

650hp is not out of the question at all on a decent motor, and no shuffle/surging issues.

The GT-RS are the big mummas where your talking 700-750hp @ fly.

They are not the turbo for 600hp at the fly as they are capable of much more, and ideally a stroker at that.