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VW's new twincharged - the way forward ?
DubwayDan:
i had a revo stage 1 put on my 1.4 tsi the other week (140 version)
here is the outcome :grin:
at the flywheel...
at the wheels...
engine is standard apart from bmc cda, forge bov and the revo.
Rich:
Not bad - its what comes to the wheels that counts ^^; - a lot is lost which could be an improvement in the near future. :smiley:
--- Quote from: luca on May 03, 2009, 04:18:59 pm ---Twincharged is good IMO, but to get big power you cant beat single turbo or efficient supercharger. Twincharge systems can suffer due to making alot of heat with a sc and turbo. Twincharge will have its limits and they will be much lower than a turbo engine :happy2:
--- End quote ---
The way the GT TSi works is, the supercharger works up to about 3,500 revs then cuts out and then tubo kicks in. This means a constant acceleration from the word 'go' - if that makes sense.
A turbo needs exhaust gasses which kicks in around 3,500 (roughly) so you lose on on take off from 0 - 3,500 revs
The beauty of the GT TSi is there is no lagg in the acceration
Hope this also answers the question to Baccilus :happy2:
BeezerDiesel:
That's sort of the answer.
In a small capacity engine the turbo won't spin up as quickly as in a bigger one so the supercharger will fill the hole in the bottom end of the power curve (emissions come into it a lot too).
In a bigger engine, say 2.0, the extra volume of the exhaust gasses can spin up a modern light pressure turbo from around 1500rpm hence the added expense and complexity of the supercharger isn't really needed.
Horses for courses.
As an example using Diesel engines as they benefit the most from turbo charging, a Polo 1.4 TDI has almost no power below 2000rpm but in a large truck with an eff off huge capacity engine the turbo is spinning nicely from around tickover and it's all over and done with at 3000rpm give or take.
Then again I could be talking out of my arse! :laugh:
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