fuel psi change require new tune?
08-30-2009, 07:23 PM
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fuel psi change require new tune? ok.... i had my car tune with duel 255's, wel happen to have a leak inside the tank,still seen 60fp 65 max wot, is on truck intake.. now i fixed everything up seeing 70 psi idealing and more wot almost 80lbs. seeing the new psi will that offset my tune. and i change to knew battery and seeing alot higher voltage. battery was dying i guess. now i have change the batt and fixed the leaks car seems to be runing rich,and gets worse as it see's boost.. will i need a new tune, thanks.
08-30-2009, 08:09 PM
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Yeah, there is a built-in assumption about fuel pressure and
anything off from that goes straight (or square root) to flow.
That assumption is embedded in the IFR table (vacuum, against
"assumed pressure", yields the values in it).
If you are boosted then I really think you want a manifold
referenced fuel pressure regulator. Then it doesn't really matter
what the volts and pumps do, only that they exceed the max
demand.
anything off from that goes straight (or square root) to flow.
That assumption is embedded in the IFR table (vacuum, against
"assumed pressure", yields the values in it).
If you are boosted then I really think you want a manifold
referenced fuel pressure regulator. Then it doesn't really matter
what the volts and pumps do, only that they exceed the max
demand.
08-30-2009, 08:16 PM
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ys im running a truck intake. runs off vacum/boost regulator,, im seeing more psi , does not go under 70 lbs, before it was 60lbs. so im thinking it was tuned for 60lbs, now i have more psi so it would be acting like its running a biger injector..?.. right/wrong?