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The Terminator
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Fuel line check valve
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<blockquote data-quote="Black306" data-source="post: 9940334" data-attributes="member: 4780"><p>Unless your fuel tables are DEAD ON, I wouldn't suggest a check valve. A check valve by itself can contribute to hesitations.</p><p></p><p></p><p></p><p></p><p>You are correct about the PPRV functioning as a check valve. However, the PPRV does not function as a typical pressure relief valve. Here is where I describe the function of the PPRV.</p><p></p><p><a href="http://www.svtperformance.com/forums/engine-tuning-214/281209-frps-6.html#post7581013" target="_blank">http://www.svtperformance.com/forums/engine-tuning-214/281209-frps-6.html#post7581013</a></p><p></p><p>Cliff notes: The 'pressure relief' you are referring to will only happen after the pumps are commanded to reduce pressure. If the pumps are commanded to run over ~67psi, they can do it. The 'pressure relief' valve will only reduce pressure in the rails when the pumps are putting out less than rail pressure. Problem is that the 'pressure relief' will only reduce pressure to ~67psi. That design flaw, a calibration of ~67psi, is what I believe to be the principal reason our cars experience hesitations.</p><p></p><p></p><p></p><p>Not exactly written for this specific subject of a check valve, but it has good info.</p><p></p><p><a href="http://www.svtperformance.com/forums/7891861-post6.html" target="_blank">http://www.svtperformance.com/forums/7891861-post6.html</a></p><p></p><p></p><p></p><p></p><p>Although I don't doubt the PPRV solved your particular issues, I highly doubt it was from the 'pressure relief' portion of the PPRV. I believe that the PPRV helped you in 2 ways:</p><p></p><p>1) The path for fuel to pass through a PPRV is very small. Similar to a KB disc, pressure spikes were slowed down because of the reduction of fuel volume caused by the PPRV's restrictive path. This gives the computer more time to react to pressure changes. This is not a problem as long as your fuel pump duty cycles are not too high.</p><p></p><p>2) Another part of the PPRV is what I referred to as a metered leak. The more fuel pressure in the line, the more fuel will come out the metered leak. That is one thing that is eliminated when removing a PPRV and, I believe, does contribute to post-PPRV delete pressure spikes which can damage a FRPS. However with proper tuning, fuel pressure spikes without a PPRV can be significantly reduced and ultimately save a FRPS.</p></blockquote><p></p>
[QUOTE="Black306, post: 9940334, member: 4780"] Unless your fuel tables are DEAD ON, I wouldn't suggest a check valve. A check valve by itself can contribute to hesitations. You are correct about the PPRV functioning as a check valve. However, the PPRV does not function as a typical pressure relief valve. Here is where I describe the function of the PPRV. [url]http://www.svtperformance.com/forums/engine-tuning-214/281209-frps-6.html#post7581013[/url] Cliff notes: The 'pressure relief' you are referring to will only happen after the pumps are commanded to reduce pressure. If the pumps are commanded to run over ~67psi, they can do it. The 'pressure relief' valve will only reduce pressure in the rails when the pumps are putting out less than rail pressure. Problem is that the 'pressure relief' will only reduce pressure to ~67psi. That design flaw, a calibration of ~67psi, is what I believe to be the principal reason our cars experience hesitations. Not exactly written for this specific subject of a check valve, but it has good info. [url]http://www.svtperformance.com/forums/7891861-post6.html[/url] Although I don't doubt the PPRV solved your particular issues, I highly doubt it was from the 'pressure relief' portion of the PPRV. I believe that the PPRV helped you in 2 ways: 1) The path for fuel to pass through a PPRV is very small. Similar to a KB disc, pressure spikes were slowed down because of the reduction of fuel volume caused by the PPRV's restrictive path. This gives the computer more time to react to pressure changes. This is not a problem as long as your fuel pump duty cycles are not too high. 2) Another part of the PPRV is what I referred to as a metered leak. The more fuel pressure in the line, the more fuel will come out the metered leak. That is one thing that is eliminated when removing a PPRV and, I believe, does contribute to post-PPRV delete pressure spikes which can damage a FRPS. However with proper tuning, fuel pressure spikes without a PPRV can be significantly reduced and ultimately save a FRPS. [/QUOTE]
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