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So I installed my gauges today and I have a few questions about them.
Boost - I have the hx35 turbo and it gets 19-20 psi max. Is that normal? Should I desire more? I have a bhaf if that matters.
Fuel pressure - I just installed a new Raptor 100 and a new injector pump. Fuel pressure moves between 15-16.5 at idle which is weird to see such movement. Should that be concerning? As i accelerate, the pressure goes up some. When i give it plenty of throttle, I see as high as 30 psi (which is as high as my gauge reads). During my research on this forum, others have stated that pressure goes down at WOT. Should I be concerned about the high pressure? I would originally think that it is a good thing, but it is opposite what most others talk about having. My injectors are stock and I am probably around 275 HP.
It has a pressure sensor at the gas line that sends an electric signal to gauge. So electric. It is located after the filter, right before the injector pump. Feed lines between LP and IJ are 1/2 inch big lines.
Sounds like your gauge is screwed up. I can't see your raptor doing that. Stock your wastegate should be set at 23 psi so those numbers sound just a little bit low, but not far off. Did you buy a cheap set of gauges?
2001- 4x4 3500, P-PUMP, #10 camplate, cpp 75hp injectors, 62/14 over s475 twins, a1 12mm head studs, 3 piece manifold, 4" exhaust, PAC brake, Fass platinum 150 lift pump, vulcan draw straw, South Bend DD clutch
Yes, they are Glowshift. Not sure why I went with them, but I did. Are they really that bad? Several people on here mentioned liking them. I did not use a snubber valve as I did not have one on hand at time of installation. Is that a necessity?
I am wondering if my scenario is possible because I have an upgraded lift pump, the big line kit, the location of sensor is right before the injector pump (post filter), and the injectors as well as everything else is pretty much stock (no box yet either).
Took it for another spin this morning and the only thing that still stands out to me is that the fuel pressure will go as high as 30 psi while I am on the throttle pretty hard. during idle and slower acceleration, the pressure stays pretty consistent around 16-18.
You do need a snubber valve. The VP produces a "waterhammer" effect which kills the gauge senders. You might have got a bad sender because I don't see any way your fuel pressure would go up when you have the pedal down. It would if you had a mechanical lift pump such as a Glacier Fuel Boss but definitely not with an Airdog.
2001 Dodge Ram 2500 2WD Auto 5.9L Cummins: Raptor 150 w/ full 1/2" line kit, Hypertech 3 Stage programmer, BD Boost Fooler, straight pipe, blocked wastegate, BHAF, 5" RSD exhaust, ISSPRO EGT, boost and fuel pressure gauges.
Ok, so throughout the course of the day, the gauge started acting more normal. Would stay around 15 or 16 and then dip to 11 or 12 when I would get on it. Occasionally it would go up to 25 or so too. Is it possible that air in the sensor could be causing that?
I purchased and installed my snubber valve. And it is making no difference. How this snubber valve works is confusing - its just a needle that you thread down - should I have it all the way open or what? My gauge is still all over the place, has my sender gone bad? This is baffling. I know I have decent pressure, because its a brand new fuel pump and vp44; but what the heck? At idle, the thing now reads 30, and when you are driving, the needle goes everywhere and it isn't consistent with the use of the throttle. Any help please?
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