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Old 05-08-2013, 07:54 AM
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Fuel PSI: Tune Specific

I tried a quick search for any threads specific to this and came up with none so figured I'd start a discussion to find some answers for curiousity.

After installing my fuel psi gauge a while back, I gave looney a try from Vivian as I have only run SRL as my daily since owning the truck. I noticed a slight fuel psi drop when I loaded looney (~58psi). I was slightly concerned since it wasnt up to what it had been but after I went back to SRL, my fuel psi idles around 63psi.

My question is, I'm not familiar enough with tuning to know, if the fuel psi is related to the tuning and power output or just slightly different parameters in tuning result in slightly different pressures. Now I know you don't just increase pressure for power, but I was just curious because I feel my srl has more juice than looney and it runs higher pressure. Again, just curious if all this is related or just a parameter in the tuning that differs between tuners?
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Old 05-08-2013, 08:12 AM
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Fuel psi really only matters on a wot run. 63 at idle is fine. 45 at idle isnt. Idle isnt the true test of fuel psi. Wot run from dead stop or lugging up a hill tc locked going about 60mph put it to the floor that's another way to test psi drop. Obviously a larger demand on pump with a tune.
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Old 05-08-2013, 08:55 AM
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Fuel pressure at idle shouldn't change from one tune to the next, FP is controlled mechanically (spring). FP may differ at wot like said before on different tunes. I know Matt tries to produce the least amount of smoke so his tune my not fuel as hard at wot vs Looney. Fuel pressure around 50-55 will give you the most HP and torque.

Last edited by snafu!; 05-08-2013 at 09:02 AM. Reason: reworded
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Old 05-08-2013, 10:27 AM
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Thats weird though, because like you said, it is mechanical, but when running looney, it would never go over 60 at idle with srl at 63 at idle. WOT on both tunes they drop about the same, mid-low 50's.
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Old 05-08-2013, 11:12 AM
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You're fine.
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Old 05-08-2013, 11:52 AM
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Quote:
Originally Posted by DoubleDpsd View Post
You're fine.
Ya I know I am fine, I was just stating the fact I see different pressures through different tunes, not questioning if they are too low
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Old 05-08-2013, 12:47 PM
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FWIW, my FP don't change with any tunes, race or tow.


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Old 05-08-2013, 01:13 PM
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agreed^ I run srl tune and my FP doesnt drop below 62 psi with blue spring in it at WOT. You need a fuel pump soon.
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Old 05-09-2013, 08:00 AM
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I've noticed a slight decrease in psi from IDP's tunes to Wildman's, Mainly from my tow tune to race tune
With my 190's Ill go from 60psi to abouit 52psi wot..
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