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The Terminator
Engine/Tuning
Fore 4v 1 LE
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<blockquote data-quote="01yellercobra" data-source="post: 17008261" data-attributes="member: 35549"><p>FWIW, 30psi isn't too low when running. It's actually pretty common. Especially if the vacuum line is hooked up. I set mine to 40 with the line disconnected. It drops to about 32 with the vacuum line connected. As it should with the vacuum reference. Everyone might be thinking of the 39psi delta between the top and bottom of the injectors. Vacuum vs boost pressure.</p><p></p><p>If you still have the stock ECU the FRPS should still be in place. It's good to keep in use as the ECU can use it as a reference if you decide to change the base pressure. No need to tweak the tune. If the ECU is still looking for it and it's not there, that could cause problems.</p><p></p><p>Even if the regulator is hooked up to the wrong source the car should run smooth. It'll just drop fuel pressure under boost. Learned that one on my buddies car.</p><p></p><p>My apologies if any if this has already been said. I just looked at the pics and skimmed everything else.</p></blockquote><p></p>
[QUOTE="01yellercobra, post: 17008261, member: 35549"] FWIW, 30psi isn't too low when running. It's actually pretty common. Especially if the vacuum line is hooked up. I set mine to 40 with the line disconnected. It drops to about 32 with the vacuum line connected. As it should with the vacuum reference. Everyone might be thinking of the 39psi delta between the top and bottom of the injectors. Vacuum vs boost pressure. If you still have the stock ECU the FRPS should still be in place. It's good to keep in use as the ECU can use it as a reference if you decide to change the base pressure. No need to tweak the tune. If the ECU is still looking for it and it's not there, that could cause problems. Even if the regulator is hooked up to the wrong source the car should run smooth. It'll just drop fuel pressure under boost. Learned that one on my buddies car. My apologies if any if this has already been said. I just looked at the pics and skimmed everything else. [/QUOTE]
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