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The Terminator
Engine/Tuning
PPRV cutaway
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<blockquote data-quote="Black306" data-source="post: 11003576" data-attributes="member: 4780"><p>I don't think it's really a matter of debate. I believe that it is more of a personal preference. Each side has its pros and cons. As I see it:</p><p></p><p></p><p>Retaining the PPRV</p><p></p><p>Pros: easy hot starts</p><p></p><p>Cons: Significant restriction, more prone to hesitation issues</p><p></p><p></p><p>Removing the PPRV</p><p></p><p>Pros: One less restriction removed from the fuel system, elimination of shift hesitation (if caused by PPRV)</p><p></p><p>Cons: Trouble with hot starts</p><p></p><p></p><p></p><p>Personally, I chose to remove the PPRV after I saw how much of a restriction is was and because of the hesitation issues I had. Most of the hesitation was removed by the tune, but there was still a 'hiccup' in datalogs. Since I've had the PPRV removed, I have gotten use to a start up procedure that doesn't give me any issues with hot starts. So between the two, removal of the PPRV was the lesser evil.</p><p></p><p>Now, if I had my way, I'd incorporate similar functions of a PPRV into my Fore hat. That would include a check valve(s) to retain fuel pressure after engine shutdown, and a true blow off valve that can be calibrated to release pressure at a given amount just like an adjustable FPR.</p><p></p><p>The check valve is pretty easy. There are companies that already make fuel check valves that secure onto AN fittings. As for the blow off function, I seriously considered mounting a FPR near the hat so that it would bleed excessive pressure. Another idea was to drill, tap, and install some kind of check ball/spring onto the under side of the Fore hat so that excessive pressure could be bled within the tank and not need any additional exterior fittings. Only problems were experimenting with the proper spring/spring height combo to get the proper blow off pressure I was looking for. Down side is that a check valve installed outside of the hat would defeat the under hat check valve. A check valve would have to be installed between the pump and hat (not a very long hose) or before the fuel pumps (not much room between the bottom of the pumps and tank.</p><p></p><p>Considering that my only real issue is having to perform a special procedure for hard starts, I abandoned the ideas to "fix" the hat. It would be nice if a bit more time was spent in designing fuel hats so that they included check valve and proper blow off valve functions.</p></blockquote><p></p>
[QUOTE="Black306, post: 11003576, member: 4780"] I don't think it's really a matter of debate. I believe that it is more of a personal preference. Each side has its pros and cons. As I see it: Retaining the PPRV Pros: easy hot starts Cons: Significant restriction, more prone to hesitation issues Removing the PPRV Pros: One less restriction removed from the fuel system, elimination of shift hesitation (if caused by PPRV) Cons: Trouble with hot starts Personally, I chose to remove the PPRV after I saw how much of a restriction is was and because of the hesitation issues I had. Most of the hesitation was removed by the tune, but there was still a 'hiccup' in datalogs. Since I've had the PPRV removed, I have gotten use to a start up procedure that doesn't give me any issues with hot starts. So between the two, removal of the PPRV was the lesser evil. Now, if I had my way, I'd incorporate similar functions of a PPRV into my Fore hat. That would include a check valve(s) to retain fuel pressure after engine shutdown, and a true blow off valve that can be calibrated to release pressure at a given amount just like an adjustable FPR. The check valve is pretty easy. There are companies that already make fuel check valves that secure onto AN fittings. As for the blow off function, I seriously considered mounting a FPR near the hat so that it would bleed excessive pressure. Another idea was to drill, tap, and install some kind of check ball/spring onto the under side of the Fore hat so that excessive pressure could be bled within the tank and not need any additional exterior fittings. Only problems were experimenting with the proper spring/spring height combo to get the proper blow off pressure I was looking for. Down side is that a check valve installed outside of the hat would defeat the under hat check valve. A check valve would have to be installed between the pump and hat (not a very long hose) or before the fuel pumps (not much room between the bottom of the pumps and tank. Considering that my only real issue is having to perform a special procedure for hard starts, I abandoned the ideas to "fix" the hat. It would be nice if a bit more time was spent in designing fuel hats so that they included check valve and proper blow off valve functions. [/QUOTE]
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