Twin fuel pump tune question
May 29, 2007, 10:58 AM
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Twin fuel pump tune question
I am about to add a second fuel pump (walbro 255lph inline). How much will this change my tune? Just out of curiosity and will I be able to start the car to at least drive it somewhere to be tuned??
PJ
PJ
May 31, 2007, 07:03 AM
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If you have a good fuel pressure regulator, and the fuel pressure has not changed at all, you should be good to go as far as driving and start, but it is possible that if you were running out of fuel flow up top before and were tuned for this, you will need to recalibrate.
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Jul 23, 2007, 05:50 PM
#8
If you have both pumps ON all the time, the tune will change drastically even with a good regulator, you will have to upgrade the return line too or the pressure is going to go up at idle.
Driving it to get it tuned should be possible either way.
I'd recommend using either a pressure switch or a relay to trigger your second pump. Our double pumper uses a pressure switch for the secondary pump. Idle and part throttle/low boost are uneffected doing it like that.
Driving it to get it tuned should be possible either way.
I'd recommend using either a pressure switch or a relay to trigger your second pump. Our double pumper uses a pressure switch for the secondary pump. Idle and part throttle/low boost are uneffected doing it like that.
Jul 23, 2007, 08:04 PM
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dave,
where could i aquire a pressure switch like this. I was going to run them both all the time but now understand why not. Any help would be appreciated. thanks
where could i aquire a pressure switch like this. I was going to run them both all the time but now understand why not. Any help would be appreciated. thanks
Jul 23, 2007, 10:19 PM
#15
I would do it where ever your turbo is still climbing into boost slowly before it is spooling really quick, however higher than low boost numbers that you hit when just mildly cruising.
I am going to set mine for 10-12 psi opening, even though it is going to be increasing boost/rpm quickly at that high, I don't want to have to deal with tuning for the switchover at boost leves were I will be when just slightly into the throttle.
*I don't know if this is a good, advisable, or bad idea, just what I am doing...
Scorke
I am going to set mine for 10-12 psi opening, even though it is going to be increasing boost/rpm quickly at that high, I don't want to have to deal with tuning for the switchover at boost leves were I will be when just slightly into the throttle.
*I don't know if this is a good, advisable, or bad idea, just what I am doing...
Scorke