Disappointing Dyno Number...436hp????
#18
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But then you would be getting "numbers" that are "helped" by the gearing.
To get an actual "engine" number, my understanding was that it should be 1:1 gearing, which would be 5th.
Am I missing something here?
To get an actual "engine" number, my understanding was that it should be 1:1 gearing, which would be 5th.
Am I missing something here?
#19
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i just dynoed last month with my settup and 5/5/4 and 6/6/4 gave me the best numbers ( 486is HP and 970 ish torque)
anything over that , the wastegate opened right away, exhaust temp shot up and I lost power
we were thinking , not enough air to support the fuel we were dumping in
I went down to 436 horse on 7/7/4, dint bother to go higher
I would put money on it that if you are running the ps62 and wastegate is set at 40 psi that you are just throwing too much fuel at it
either try lower settings or twin turbos (more, cooler air)
this is my theory, be it right or wrong
oh ya we dynoed in 6th on a dynojet
another thing, I see you have the twins program, I ran with the tame version, so I for sure think you are throwing too much fuel for your air supply
I really think over 500 hp is gonna be a stretch for that turbo
may be possible but challenging
anything over that , the wastegate opened right away, exhaust temp shot up and I lost power
we were thinking , not enough air to support the fuel we were dumping in
I went down to 436 horse on 7/7/4, dint bother to go higher
I would put money on it that if you are running the ps62 and wastegate is set at 40 psi that you are just throwing too much fuel at it
either try lower settings or twin turbos (more, cooler air)
this is my theory, be it right or wrong
oh ya we dynoed in 6th on a dynojet
another thing, I see you have the twins program, I ran with the tame version, so I for sure think you are throwing too much fuel for your air supply
I really think over 500 hp is gonna be a stretch for that turbo
may be possible but challenging
#20
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Smkn, The gearing doesn't provide any advantage....6th raises the load on the engine and keeps the engine at its best performance rpm. By maxing out rpm early in 5th you had pre mature injector elation. ks
#21
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Originally Posted by Smkn600CTD
Best run was 9/9/3 made 436.hp corrected. 480hp was the uncorrected numbers. Torque was in the lower 700 range. Both at a peak of 2900rpm.
Most dyno operators will use uncorrected numbers on forced aspirated vehicles. There is a correction factor for forced aspiration but SAE doesn't publish it or use it. The only condition that gets scued when using a correction factor on forced aspiration is the barometric pressure. This is scued because the turbo is making boost which changes the air pressure, obviously. The humidity and air temp play roles in the combustion as well but not as much as pressure. Pressure does change though in relation to altitude and turbo efficiencies but again, it's not really used in the dyno world.
6th gear is used on inertia dynos because of boost alone. 6th gear loads the engine more so the boost raises higher and maintains throughout the run. There is no "magic" in using 6th gear. If the dyno operators would learn to load the truck with the brake first to build boost and then sample the run, you would see different numbers. The 1:1 gear ratio, 5th in our trucks, will produce the most power from a drivetrain. It's the mechanical efficiency of the 1:1 that allows that along with the moment of inertia and acceleration rate.
#22
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That would explain the 520/990 D-max......that was in OD
abc4yew: That's one way to put it
Agades: Boost is 50peak, settles in at 45psi. Its wings over to 50psi about as fast as it can, and drops back to zero just as fast when you let of the pedal. ALMOST thinking the 66/14 is what I should have got.
As for the weather, it was about 50 degrees and raining, altitude I would guessmate 500ft??? As for the corrrection factor, that is why I asked for the "uncorrected" number, to see what it was straight up.
abc4yew: That's one way to put it
Agades: Boost is 50peak, settles in at 45psi. Its wings over to 50psi about as fast as it can, and drops back to zero just as fast when you let of the pedal. ALMOST thinking the 66/14 is what I should have got.
As for the weather, it was about 50 degrees and raining, altitude I would guessmate 500ft??? As for the corrrection factor, that is why I asked for the "uncorrected" number, to see what it was straight up.
#25
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The dyno numbers were the same EZ on the truck or unplugged. Going from 1-2 dropped 3hp
Fuel Pressure was 17psi the entire time. And it had smoke on the dyno runs.
I think part of it too is the dyno run was done in 5th, not 6th.
All i know is that it pulls like a rapped ape on crack And will blow some smoke
Fuel Pressure was 17psi the entire time. And it had smoke on the dyno runs.
I think part of it too is the dyno run was done in 5th, not 6th.
All i know is that it pulls like a rapped ape on crack And will blow some smoke
#27
Originally Posted by cquestad
Monitor your rail pressure...sounds like you may have issues. Not all CP3's seem to be created equal.
BDDL on Tow and TST standard program on 7x7 gave 526hp.
I think there's a delicate balance between timing/duration/pressure that needs to be found for max power.
Correction factor was .95 on Saturday. If I'm calculating correctly, my uncorrected number would be 553.
#28
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Originally Posted by JCLeary
Correction factor was .95 on Saturday. If I'm calculating correctly, my uncorrected number would be 553.
That is correct. Pardon the pun. If the correction factor was .95 then looking at corrected HP actually hinders your numbers. It's kind of silly but that's what SAE gives the dyno world to deal with. A good operator knows the difference though.
#29
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Here are the links to the dyno graphs.
This was the best run at 9/9/3
Uncorrected graph.
http://www.dynotuning.com/nor-cal-ch..._rpmactual.jpg
SAE Corrected
http://www.dynotuning.com/nor-cal-ch...004_rpmsae.jpg
I also uploaded the one pic showing the smoke. Its in the "My Gallery" section on here.
This was the best run at 9/9/3
Uncorrected graph.
http://www.dynotuning.com/nor-cal-ch..._rpmactual.jpg
SAE Corrected
http://www.dynotuning.com/nor-cal-ch...004_rpmsae.jpg
I also uploaded the one pic showing the smoke. Its in the "My Gallery" section on here.
#30
My girlfriend recorded my runs. Go figure, the smokiest run was the worst. The cleanest was the highest.
I still think you drained the rail early. I can't wait to get a rail pressure gauge to see what's going on with my truck.
I may buy two, one to mount, and one to bring to dyno day for others to use. I just need to make a pigtail for the rail pressure sensor.
I still think you drained the rail early. I can't wait to get a rail pressure gauge to see what's going on with my truck.
I may buy two, one to mount, and one to bring to dyno day for others to use. I just need to make a pigtail for the rail pressure sensor.
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