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The Terminator
Engine/Tuning
Staging Triple Fuel Hat
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<blockquote data-quote="jony51999" data-source="post: 16252213" data-attributes="member: 155011"><p>My car has a triple pump hat in it with a return system. Everything works great, but the 3 pumps are wired with their own relays and run all the time.</p><p></p><p>Since this is overkill and can lead to fuel heating, I’m planning to stage 2 of the pumps.</p><p></p><p>The method I’ve seen (other than expensive controllers) is to use a Hobbs pressure switch thats normally open and closes at 2-4 psi. </p><p></p><p>My concern with that is if the switch was to fail it would remain open under boost, lean out and you know how that ends.</p><p></p><p>So I’m thinking instead of using a normally open pressure switch that closes under boost, I’ll use a normally closed vacuum switch that opens under 2 in/hg of vacuum. This way if the switch was to fail, the result is the 3 pumps run all the time which won’t cause the issue of a failed pressure switch.</p><p></p><p>The other option I’m considering is to use the snow performance meth controller to kick the 2 additional pumps on based on the MAF or MAP voltage. My car came with a stage 2 meth kit which is no longer used as I’m straight E85 now.</p><p></p><p>Anyone used a setup like either of these and have input?</p><p></p><p></p><p>Sent from my iPhone using Tapatalk</p></blockquote><p></p>
[QUOTE="jony51999, post: 16252213, member: 155011"] My car has a triple pump hat in it with a return system. Everything works great, but the 3 pumps are wired with their own relays and run all the time. Since this is overkill and can lead to fuel heating, I’m planning to stage 2 of the pumps. The method I’ve seen (other than expensive controllers) is to use a Hobbs pressure switch thats normally open and closes at 2-4 psi. My concern with that is if the switch was to fail it would remain open under boost, lean out and you know how that ends. So I’m thinking instead of using a normally open pressure switch that closes under boost, I’ll use a normally closed vacuum switch that opens under 2 in/hg of vacuum. This way if the switch was to fail, the result is the 3 pumps run all the time which won’t cause the issue of a failed pressure switch. The other option I’m considering is to use the snow performance meth controller to kick the 2 additional pumps on based on the MAF or MAP voltage. My car came with a stage 2 meth kit which is no longer used as I’m straight E85 now. Anyone used a setup like either of these and have input? Sent from my iPhone using Tapatalk [/QUOTE]
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