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Turbo timer and blow-off valve for 850T[ALL/1998] posted by Terence Lui on
Monday, 29 December 1997, at 2:48 a.m.
I have been wanting to put a turbo timer in my 95 854T for a while. But I have been unable to find out if I could actually install one, since the car's alarm system turns on once the car is locked, and if I know correctly, the engine could not be running if the alarm is on, so is it possible to install a turbo timer in my car?
Secondly, I have been tempted to try a blow-off valve in my car since it seems to be a very popular item for Japanese turbo cars, any thoughts?
My last question is, have anyone tried the Nology spark plug wires and the power core unit from Group 6? I have bought a set but haven't install it yet, any tips or opinion?
Thanks
Terence Lui
'95 854T
Re: Turbo timer and blow-off valve for 850T[ALL/1998] posted by Ira Blumberg on
Tuesday, 30 December 1997, at 5:57 p.m.
I don't know about the 850, but the S70 T5 has a blow off valve already. In fact almost all production turbo engines today include a blow off valve. For those who are wondering, here is the purpose and function of a blow off valve. When the turbo is producing boost, if the driver suddenly steps off the gas, the throttle plate closes and all the pressurized air between the turbo and the throttle plate (i.e., in the intercooler and assorted pipes) has no where to go. This puts lots of pressure on the compressor blades in the turbo and over time can damage the turbo shaft bearings. It also makes the car jerk violently as the exhaust flow is suddenly constricted when the impeller (at the other end of the shaft from the compressor) suddenly slows down. The blow off valve senses when the throttle plate closes (via a vaccuum line) and releases the compressed air in the intake hoses back to the air box where it will do no harm.
There are only 2 reasons to install an aftermarket blow off valve. (1) Some stock blow off valves leak and release boost pressure thereby limiting the total turbo boost available. For example in the second generation Mitsubishi Eclipse, the blow off valve will leak above 14 psi. Leaking is unlikely with the low (about 10 psi or less) boost in the 850/S/V70 engines. Generally, this is only a concern when substantially increasing the boost above factory levels. (2) Some aftermarket blow off valves make "cool" noises when releasing the compressed air.
As for Nology wires, people have used them with mixed results. If they are not properly grounded, they will interfere with your radio and may even damage your engine control computer. I had a set for my Eclipse and was not impressed with the quality of the wires. The glue melted and leaked out of the wire jackets. This has not happened with any other wires.
In general, about the only "performance enhancing" ignition products that have consistently shown real results are AC Delco Rapid Fire spark plugs. High energy coils and the like are great for cars running lots of turbo boost (20+ psi) where the spark produced by the stock ignition may be "blown out" by the increased air flow, but they are not necessary for stock vehicles.
--Ira