1.8T 20v Twin Scroll Kits - JBS

JBS Twin Scroll

JBS can offer a Twin Scroll Turbo application for the 1.8 20VT. There are two stages available which with there hybrid turbo versions will be able to offer up to 550bhp, with full boost predicted between 3000-3500RPM depending on spec.

A "twin scroll" or "divided inlet" means that there are two separate volutes within the turbine housing. The main reason for doing this is to isolate the pulses coming from each exhaust port and maintain more of the pulse energy from each cylinder all the way down to the turbine wheel. There are no differences between the turbine wheels used in open or single inlet turbines compared to those used in twin or divided inlet turbines.

Generally speaking, a divided inlet turbine setup will respond faster and produce boost quicker than a single or open design of the same nozzle area, of course this is dependent upon proper execution.


While it does not cause any problems or harm to run a divided inlet turbine housing on a manifold that is an "open" design, none of the benefits of the twin inlet will be seen.

Key features include:
Twin Scroll Design for better response and spool
New More efficient and larger compressor preventing compressor surge
Better pump gas efficiency
Improved actuator design



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