One of the biggest causes of boost spiking is a long section of hose used between the compressor housing and the wastegate actuator.You simply have a much bigger volume of hose to fill.
The easiest way to remove a spike is to keep your hose size the same as stock i think 1/4 inch on a 7mgte and keep the hose length short .a leaking intercooler hose will actually remove a spike because your bleeding air off .
It is however possible to have a spike due to a leak in the boost pressure line (from turbo to actuator).
Having said all that the most successful boost control system i have ever used has about a 2 second overboost(depending on load) .The overboost allows a short burst of higher boost up to around peak torque .This much better than running a fixed high boost setting .
With an 19 psi overboost,dropping back to 16 the car is actually quicker than if boost is set at 18 psi ...WHY less heat .0-100 times dropped from 5.3 to 4.8 peak power was the same with both setups
This does not prevent detonation at peak torque but does prevent high rpm detonation usually caused by heat from a turbo being boosted beyond its boost efficiency threshold .
So IF its not pinging around peak torque (i think 4500 rpm for 7mgte??)leave it it makes much better acceleration
Thu, 26 September 2002 00:54
