Quote:
Originally Posted by vfrqqq
Thanks for sharing your experience. I've suspected that the behavior I was experiencing is due to the recirculation valve, whether it is faulty or not, and I'm fine with it being that way to seemingly conservatively protect against compressor surge. I might try a different recirculation valve though, if only to satisfy my own curiosity. How did you decide that the middle spring (what PSI?) was the right one? Throttle performance and MAF readings? Other indicators?
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Before I make any further comments, let me write this warning. Recirculation valve is there to protect the compressor from surge damage. It is soft enough to make sure compressor is not damaged. You can push the surge limits of compressor by replacing the recirculation valve. I just don't want more people coming here with broken compressors.
But most of are here for pushing the limits of our cars. So, here is my experience:
I started with the softest spring. It was working just like the stock recirculation valve. Tried the hardest spring next and noticed that the throttle response was quicker. However, I was worried that it was opening too late (at higher vacuum) to cause surge on the compressor. The middle strength spring gave still better throttle response but no noticeable surge. You can hear the surge when you quickly release the throttle. Same thing happens with rev limiter. The sound of valve opening and compressor surging are different.
Warning again: Don't try too hard though, you can damage the compressor. I wish I had made a video to show the difference. It is like a whoosh sound with valve opening and a fluttering sound with surge. You definitely want to avoid the surge.
If my compressor fails, I will not be bothering Jackson Racing with warranty. I know the cost of Rotrex c30 and how easy it is to replace.