Maintenance
8135−1/A1
RT-flex58T-D
Winterthur Gas & Diesel Ltd.
1/ 2
1. General
The Low-Load Tuning provides the lowest possible Brake Specific Exhaust gas
F
low (BSFC) in the operating range of 40 to 70% engine load.
With Low-Load Tuning, engines can be operated continuously and reliably at any
load in the range of 30 to 100%.
The Low-Load Tuning concept is based on the combination of a specifically de-
signed turbocharging system setup and appropriately adjusted engine parame-
ters related to fuel injection and exhaust valve control.
The reduced part-load BSFC in Low-Load Tuning is achieved by optimizing the
turbocharger match for part-load operation. This is done by increasing the com-
bustion pressure at less than 75% load through an increased scavenge air pres-
sure and a higher air flow (waste gate closed), and by blowing off part of the ex-
haust gas flow (waste gate open) at engine loads above 85%.
Low-Load Tuning requires the fitting of an exhaust gas waste gate, i.e. a pneumati-
cally operated valve on the exhaust gas manifold before the turbocharger turbine.
Exhaust gas blown off through the waste gate is by-passed to the main exhaust
uptake. The waste gate is opened at engine loads above 85% to protect the turbo-
charger and the engine from overload.
Schematic functional principle of Low-Load Tuning:
WASTE
GATE
AIR
A
EXHAUST
EXHAUST GAS MANIFOLD
SCAVENGE AIR RECEIVER
ENGINE
TURBOCHARGER
Exhaust Waste Gate (Low-Load Tuning)
V2 / 2013
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