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I usually run about 50psi of fuel pressure,and on N/a engines I rarely ever connect the vacuum hose.No reason really,just like to keep things constant when tuning.When the hose is disconnected,the fuel pressure stays at the set pressure,when connected,it drops the idle fuel pressure and slowly raises back up to preset pressure as the throtle is opened.
 

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Usually when I have the vacuum port of the regulator connected,the engine idles slightly higher.
When driving hard or revving high,the engine will idle at around 1500 rpm for a couple of seconds though.
 

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K20DC2R said:
do you guys have idle problems? mine coming to a stop idles high then lowers after a couple of seconds....does that happend to you guys without the vaccum hooked up?
I've seen brian g mention a few times, that hooking up the vacuum line to the FPR will make the K series ECU "freak out"???
 

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Discussion Starter · #11 ·
allmtrallday said:
i run with the vacum line fuel pressure is set about 60psi. runs good. sometimes idle will get about 1200-1500, and drops as soon as i come to a full stop.
same as mine i hate that shhh.... the k20/k24/d17 are supposed to run high constant fuel pressure..... how was cmi neil?? good job on the 12.1.........props!!!!
 

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Discussion Starter · #15 ·
JDM K20 Coupe said:
JDM K20 Coupe said:
which vaccuum line are you guys talking sbout disconnecting? the fuel pressure one or another one? should you leave the line open or plug it up?
wow nobody has answered this yet
we're talkin about the vaccum hose that goes to the fuel pressure regulator...
 
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