Xr6 Twinturbo!

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BMW is a little different to you usual twin turbo setup. It has one small and one bigger turbo the small turbo brings boost nice and early and the bigger turbo takes over higher in the rev range. Not sure exactly how it's set up.

Similar to Volkswagen's twin charge setup but they use a supercharger and a turbo.

[XR6TWolf]

BMW use a sequential system, small turbo down low, big one kicking in further up the range.

The Nissans have always used a parallel system in GTRs & 300Zs. Even on the GTR inline sixes they had two exhaust manifolds, one for the front 3 cyls, one for the rear 3 with a turbo attached to each.

The point I am making here is the the argument for twin turbos (particularly parallel) is much less valid now than it was 20 years ago when the first of the GTRs came out.

Without making too fine a point, drive a stock GTR with in line six and twin turbos, then drive an XR6T. I am not interested in which is the better car, that's really not the point. What is relevant is that the GTR is delivering useable boost far later than the XR6T.

[xr_velocity]

BMW stats: 400 Nm of torque between 1,300 rpm and 5,000 rpm. Note that the red line is 7100 rpm, higher than our cars.

To have a twin turbo for the purposes of driveability, rather than outright power and an irrelevant to some time down the quarter mile, would be the reasons someone might go ahead and do it. If only I had the disposable income to throw at it :(

[xr_velocity]

One other point, the BMW petrol engine uses parallel trubos, the diesel engine uses sequential...and comes on peak torque later than the petrol.

GTR is 2.6 litre...it would need 2 tiny turbos to come on as early as a 4 litre. The BMW is a 3 litre engine though comes on much earlier than a 4 litre...all depends on turbo size.

Edited 27/07/09 01:26 AM by xr_velocity

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Previous thread here if you're bored and looking for something to read.

I say go for it, we can't all be sheep.

[turbo.vixen]

we can all be goats though

[Dagabond]

whats the point when you can get 9 seconds out of a single turbo

Take a 335i for a drive....

Previous thread here

Previous?

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Oh...stuck in an endless loop.

Try this one then

Is it a bird, is it a plane, no it's mergemaster Dags....no thread shall remain untouched.

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atm on the skyline forum, there is a comparison between a single 3582r and twin 2835 low mounts. it is on a 2.6ltr. the 35 is a clear winner imo. go single 4 eva.

[Ricky N]

atm on the skyline forum, there is a comparison between a single 3582r and twin 2835 low mounts. it is on a 2.6ltr. the 35 is a clear winner imo. go single 4 eva.

I’m all for single turbos but a GT3582R vs 2x GT2835R's is not an even match.

1x GT3582R = 650hp worth of flow

2x GT2835R's = over 800hp of flow

Twin GT2560R's vs single GT3582R would be a more accurate comparison.