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Message: [QUOTE="superpsd, post: 1492312, member: 15821"] All I have found is multiple threads from the past when a good deal of the injector builders use to post more frequently on these subjects. I have found and recalled Charles saying he experimented with different VOP to find the same. Cleaner burn, louder idle and overall more noise, but loss of power on the dyno. Not sure if he ever tweaked tuning to compensate for the VOP increase. He said he ran some Hybrids with B code springs. Unlimited once stated wat back in 2008 from an old thread I dug up from PSN ... "The springs never seemed to make a difference. We have ran as low as 2675 and as high as 4500 VOP and as charles has stated, it seems to run better at the lower VOP. Also, the higher the VOP the later the injector opens, and the shorter Injector Pulse Width (read: ACTUAL TIME, NOT REQUESTED TIME that the injector is delivering fuel). I believe that 2675 is enough no matter what size holes you are running" Now wether it has an huge effect I am unsure. I can see how it can help to clear things up in lower rpm low ICP conditions like towing and idle etc etc. Overall performance the lower VOP would likely stand firm. Some have been able to tune even 400% nozzles to be street daily driven friendly but its quite the challenge. It would be interesting to take a 400/400 injector either B code or hybrid does not matter and play with VOP and see if a 400/400 would be cleaner with a higher VOP of course however likely sacrificing some high end power. [/QUOTE]

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