disappointing dyno numbers.

Sequential6.4L · Sep 14, 2015

Did 552hp at 1087 ft lbs yesterday on the Jefferson state dyno, about 3 years prior I'd did 571 with stock transmission, same 310 tune file, an OEM turbos. I'm now running river city 59/75, with the same tune an a built trans. What are you guys seeing for rail pressure on the 310 tune? I could a sworn those few years back I was pushing 27k psi, an now my rails are dropping off to 22,600, truck has 90k miles tuned the whole time, Im thinking a weak pump is to blame for my numbers, thoughts? Anywhere else to look?

Gearhead · Sep 14, 2015

Your rail pressure at 22.6k is going to cost you 75-125hp with that setup from what I've seen.... Get a pump and you will be much happier with your numbers.

getstroked27 · Sep 14, 2015

What he said^^^ Sounds like your stock pump is getting ready to retire. Perfect time to do dual fuelers and nozzles

HS-MotorsportsDallas · Sep 14, 2015

I agree with Matt. Low rail pressure is going to kill your power potential.

Rubenk · Sep 14, 2015

I've got a thread with similar results. New HPFP brought rail pressure up but power is about the same.

madman1234509 · Sep 14, 2015

Even buying a new pump will only give you borrowed time. These pumps seems to lose rail pressure quickly on the highest tunes. Duals pumps and don't look back

Gearhead · Sep 17, 2015

Rubenk said:
I've got a thread with similar results. New HPFP brought rail pressure up but power is about the same.

what mods?

StrokiNDieseL · Sep 17, 2015

I just finished a build & got 620-650 on mild H&s files. I did a HPFP replacement & believe I'm running out of fuel & need a 2nd pump/lpfs due to adding nozzles quickly..

Sequential6.4L · Sep 18, 2015

Made some pulls on the hot damn 300, with that tune I was bouncing around between 23-25k of rail pressure under WOT. Any ideas what I should be maintaining with that tune?

Groomzybanshee · Sep 18, 2015

Sequential6.4L said:
Made some pulls on the hot damn 300, with that tune I was bouncing around between 23-25k of rail pressure under WOT. Any ideas what I should be maintaining with that tune?

Right where it is.

6.4 Stroker · Sep 18, 2015

25k may dip into the 24.5s.
When mine was weak it would drop to 23k and slowly climb back to 25k as RPM increased.

Sequential6.4L · Sep 19, 2015

Yeah mines getting real weak for sure. I haven't been able to get out of the 23k range under WOT. General consensus is dragon fire pumps are still garbage? I dont want dual fuelers but I want something that more capable then stock..

GROSSpolluter · Sep 23, 2015

I run h&s and my rail pressue is around 24k-24.5k i made 611whp on that same dyno.

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Sequential6.4L · Sep 25, 2015

611 with a batmowheel? Man I wonder what's causing mine to put out such low #s. Just hard a pill swallow spending 4k on upgraded chargers an going back 20hp..

Powerstroke Man 6.4 · Sep 25, 2015

Sequential6.4L said:
611 with a batmowheel? Man I wonder what's causing mine to put out such low #s. Just hard a pill swallow spending 4k on upgraded chargers an going back 20hp..

from the looks of the RP #'s you need a new HPFP and more fuel, you are not pushing the chargers hard enough from the looks of it.

GROSSpolluter · Sep 25, 2015

I was driving my truck to work this morning on the fwy and i stabbed it. rail pressure jumped to 25.1k and held steady at 24.9-25k. Air dog is at 15psi and regulator on ede fuel block is set at 12psi. Running h&s 300 tune.

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GROSSpolluter · Sep 25, 2015

Sequential6.4L said:
611 with a batmowheel? Man I wonder what's causing mine to put out such low #s. Just hard a pill swallow spending 4k on upgraded chargers an going back 20hp..

Not trying to put salt in the wound, 611 was with batmo, airdog, 5" dp back, stock down pipe, airaid intake, egr deleet, no limit cold pipe/elbow and crappy intercooler boots. Since then i deleetd fuel bowl with ede block, 6.0 manifolds and rudys up pipes, no limit air intake, 4" down pipe and diesel site boots. Not sure what it makes now, just waiting for the dyno to come back to town haha

https://youtu.be/KJN13lUDKfo

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Sequential6.4L · Sep 25, 2015

My numbers were with the 59/75, built trans, airdog 150, full ******s, ic pipes, an a no limit fab intake, so real similar setup, I think I may have found my issue along with having a weak pump my engine is pretty weak to an is about ready to go out to lunch I think, eating lots of coolant, rising oil level an lots of sludge coming out my ccv vent. I'm not blowing my degas cap so I think its something other then head gaskets.