Date: Mon, 23 May 2005 09:29:10 +1000 From: ShazWozza <shaz_wozzanospamentspring.com> Subject: Re: CAN i run a BLOW OFF VALVE safely??????
es wrote: > IF I run a atmospheric blow off valve instead of a recycling diverter > valve on my 1990 saab 9000 cd 2.0 turbo will it not run as well? will > the check engine light appear? has someone done this and can tell me > how it runs? I hear it is not good for the ECU and will not spool up as > fast. If it is ok which one is the best out there for the $$? i really > like the sound of the blow off valves:) > > and why is it that i only get boost when the car is in gear and going > but not when i just rev it???? Why not install an electronic BOV sound effects unit instead? They have the advantage of having an adjustable volume control and you don't even need a turbo charger. You could also consider putting blue LEDs on your windscreen wipers and replacing your headlamp bulbs with ones that have a blue/green tint. Revving the engine in neutral will not generate much boost because there is relatively very little air going through the motor without a proper load. If your car has a slushbox, you could try putting it in gear, standing on the brakes with your left foot and then rev it using WOT to the torque convertor's stall point. When you reach the stall speed don't keep it there too long as your box is gunna get hot real quick. (You know you're at torque convertor's stall speed because the motor won't increase its revs any more) The technique for a manual is a variation of this but it requires dexterity that you may not yet posess. Put it in gear. Use your heel to hold down the accelerator pedal and use the upper part of your foot to stand on the brakes and at the same time release the clutch sufficiently to load up the motor and allow some slippage. Now you have the conditions for boost. Increase the throttle to WOT and judiciously let the clutch out a bit more to load up the engine (don't forget to keep holding the brakes on). When you see the boost gauge climb and the tacho reaches approx 3,000 RPM release the clutch suddenly while simultaneously releasing the brakes. You should be rewarded with generous amount of wheelspin, torque steer and smoke. Strangely, privately owned and registered Saabs don't like this treatment. Rentals LOVE it.
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