misterp Posted May 19, 2011 Report Share Posted May 19, 2011 The truck got its final upgrade, I went from the POS Bosch plastic bypass valve to a polished Vortech Mondo race valve. But my first drive I hated it; the reason I say is not because of the noise (which is substantial) but because the part-throttle response in daily driving is a dog. Before I had this valve I could just throw a sharp slight stab of the toe into the gas pedal and the truck would pull really hard, now because the bypass is open a large part of the time (unless you are 100% foot-down WOT) it is venting boost during normal driving and the engine response is crappy. There is an adjustment screw on the valve, and I did 'tighten' the valve so it closes sooner (with less manifold vacuum) and the truck feels better at 1/2-throttle, but the off-idle is still sucky. The instructions warn not to tighten more than 4-full turns, I'm already at 6-turns and want to go more - anyone gone through this learning experience already and have advise? Do I just keep tightening the adjustment screw until the valve closes just off-idle? Do I want to tighten it so much that the valve is closed at idle, but still 'vents' at WOT lift-off to prevent compressor surge? I am wondering how far should I tighten it... Mr. P. Quote Link to comment Share on other sites More sharing options...
sprayed99 Posted May 19, 2011 Report Share Posted May 19, 2011 The truck got its final upgrade, I went from the POS Bosch plastic bypass valve to a polished Vortech Mondo race valve. But my first drive I hated it; the reason I say is not because of the noise (which is substantial) but because the part-throttle response in daily driving is a dog. Before I had this valve I could just throw a sharp slight stab of the toe into the gas pedal and the truck would pull really hard, now because the bypass is open a large part of the time (unless you are 100% foot-down WOT) it is venting boost during normal driving and the engine response is crappy. There is an adjustment screw on the valve, and I did 'tighten' the valve so it closes sooner (with less manifold vacuum) and the truck feels better at 1/2-throttle, but the off-idle is still sucky. The instructions warn not to tighten more than 4-full turns, I'm already at 6-turns and want to go more - anyone gone through this learning experience already and have advise? Do I just keep tightening the adjustment screw until the valve closes just off-idle? Do I want to tighten it so much that the valve is closed at idle, but still 'vents' at WOT lift-off to prevent compressor surge? I am wondering how far should I tighten it... Mr. P. glue it shut it will be fine Quote Link to comment Share on other sites More sharing options...
Cramer Posted May 20, 2011 Report Share Posted May 20, 2011 More boost!!!!!!!!!!!!! That should take care of your problem. Quote Link to comment Share on other sites More sharing options...
idahoBLKss Posted May 20, 2011 Report Share Posted May 20, 2011 Well this will be your problem if you tighten it too much. What will happen is that from a wot pull and you let off at full boost you'll start popping your charge tubing off so I would just play with it till you think its where you want it whith out popping tubes or surging your s/c or even poppi.g your belt off. Quote Link to comment Share on other sites More sharing options...
misterp Posted May 20, 2011 Author Report Share Posted May 20, 2011 AHHHH Gotcha! Makes sense. We'll keep tightening the screw then! Mr. P. Quote Link to comment Share on other sites More sharing options...
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