trick performance PROPS!!!!!
03-06-2008, 10:24 AM
#63
TECH Junkie
Join Date: Mar 2003
Location: Katy, TX
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03-06-2008, 10:45 AM
#65
Originally Posted by Garret Turbo 103
Surge is the left hand boundary of the compressor map. Operation to the left of this line represents a region of flow instability. This region is characterized by mild flutter to wildly fluctuating boost and “barking” from the compressor. Continued operation within this region can lead to premature turbo failure due to heavy thrust loading.
Surge is most commonly experienced when one of two situations exist. The first and most damaging is surge under load. It can be an indication that your compressor is too large. Surge is also commonly experienced when the throttle is quickly closed after boosting. This occurs because mass flow is drastically reduced as the throttle is closed, but the turbo is still spinning and generating boost. This immediately drives the operating point to the far left of the compressor map, right into surge.
Surge will decay once the turbo speed finally slows enough to reduce the boost and move the operating point back into the stable region. This situation is commonly addressed by using a Blow-Off Valves (BOV) or bypass valve. A BOV functions to vent intake pressure to atmosphere so that the mass flow ramps down smoothly, keeping the compressor out of surge. In the case of a recirculating bypass valve, the airflow is recirculated back to the compressor inlet.
Surge is most commonly experienced when one of two situations exist. The first and most damaging is surge under load. It can be an indication that your compressor is too large. Surge is also commonly experienced when the throttle is quickly closed after boosting. This occurs because mass flow is drastically reduced as the throttle is closed, but the turbo is still spinning and generating boost. This immediately drives the operating point to the far left of the compressor map, right into surge.
Surge will decay once the turbo speed finally slows enough to reduce the boost and move the operating point back into the stable region. This situation is commonly addressed by using a Blow-Off Valves (BOV) or bypass valve. A BOV functions to vent intake pressure to atmosphere so that the mass flow ramps down smoothly, keeping the compressor out of surge. In the case of a recirculating bypass valve, the airflow is recirculated back to the compressor inlet.
03-06-2008, 11:23 AM
#66
sounds about right. guees i should stop doing 10lbs at part throttle. lol. but its so easy. i mean come on 40& throttle and 7-10lbs. well i went wot with my new tune. wooo that was crazy. i thought the front end was gonna lift. it squated before but damn. and fuel was at 11.2-11.3ish the whole time. gonna do more tonight.
03-06-2008, 11:26 AM
#67
sounds about right. guees i should stop doing 10lbs at part throttle. lol. but its so easy. i mean come on 40& throttle and 7-10lbs. well i went wot with my new tune. wooo that was crazy. i thought the front end was gonna lift. it squated before but damn. and fuel was at 11.2-11.3ish the whole time. gonna do more tonight.
03-06-2008, 11:38 AM
#69