GT2871R spool response

[AlexTDi]

I think Ryan has this exact Turbo on his Jetta, PM him..

[Jetta2]

GT2871R with AR.86 turbine housing.
Custom equal length tubular exhaust manifold.
2 litre 8 valve with X-flow head.
Starts spooling at just under 2000rpm.
Hits a full 0.8 Bar of boost at around 4000rpm and holds that all the way to 6500rpm where the limiter is set at.

And that is with the crappy 52mm downpipe currently fitted, with the new 63mm one, spool will happen slightly earlier.

[Jetta2]

No probs. Also remember the 20V head flows a hell of a lot more on the exhaust side than the 8V head does, so a direct comparison is a bit unfair.
With a cast manifold, the spool on my setup will be even sooner, but will lose out on higher revs. The runners on this exhaust mani are about 400mm long compared to a cast manifold that is +-170mm long on the longest runner.

Pic:

[Zubair]

.64 will spool quicker no doubt, .86 is more laggy.