Dyno Results.....
Fleet Owner
Joined: Jul 2006
Posts: 20,357
Likes: 813
From: Mi'kma'ki
thats a crap load of smoke though.if you guys didn't have 'em setup so rich on the low end,before spool,they just wouldn't boost though i suppose.
Post Fiend
Joined: Jan 2000
Posts: 5,330
Likes: 17
From: Dryden, ON, Canada
That is one of the limitations of the DB2 pump, there is no boost reference built in, all the pump knows is your foot is asking for more fuel, not how much air is being pumped through the engine.
My cummins with the AFC, not only can I control max fuel, but I can also control how much of that fuel is available at no boost, as well as up to around 15 psi or so.
Still, a dyno is pretty much worst case scenario for smoke.
My cummins with the AFC, not only can I control max fuel, but I can also control how much of that fuel is available at no boost, as well as up to around 15 psi or so.
Still, a dyno is pretty much worst case scenario for smoke.
Postmaster
Joined: Dec 2004
Posts: 2,941
Likes: 30
From: Maple Valley, WA
That is one of the limitations of the DB2 pump, there is no boost reference built in, all the pump knows is your foot is asking for more fuel, not how much air is being pumped through the engine.
My cummins with the AFC, not only can I control max fuel, but I can also control how much of that fuel is available at no boost, as well as up to around 15 psi or so.
Still, a dyno is pretty much worst case scenario for smoke.
My cummins with the AFC, not only can I control max fuel, but I can also control how much of that fuel is available at no boost, as well as up to around 15 psi or so.
Still, a dyno is pretty much worst case scenario for smoke.
Out on the street though, its not bad at all... I only have to move the throttle a 1/4" or so to cruise... The smoke is there for somebody that deserves it though...........
Laughing Gas
Joined: Feb 2010
Posts: 859
Likes: 2
From: Port Orchard, WA
As long as you have a rough idea what RPM your maximum power is at,
HP = Torque x RPM ÷ 5252
So...
TORQUE = HP x 5252 ÷ RPM
Assuming 345hp@3300rpm, that would put you at 549 ft-lbs@ 3300rpm, which isn't necessarily your torque peak.
HP = Torque x RPM ÷ 5252
So...
TORQUE = HP x 5252 ÷ RPM
Assuming 345hp@3300rpm, that would put you at 549 ft-lbs@ 3300rpm, which isn't necessarily your torque peak.
Laughing Gas
Joined: Feb 2010
Posts: 859
Likes: 2
From: Port Orchard, WA
So, it depends on the rpm. You can't just double the max hp and get torque. If you happened to know what your horsepower at 2600 rpm was, then yes, you could double it.
Your max torque is probably around 600.
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Senior User
Joined: Jan 2003
Posts: 123
Likes: 0
From: Graham wa
So I am not sure if they gave me the correct sheet for my truck. The sheet shows my max power at 332.1... I really don't think this is mine!!!! I could have sworn the screen was showing 125 max power when they were dynoing mine. Should I give them a call and see if they kept track of whose dyno run was whose?
Duane
Duane
Postmaster
Joined: Dec 2004
Posts: 2,941
Likes: 30
From: Maple Valley, WA
At 2600rpm, the ratio is 2 TQ to 1 HP because of the mathematical relationship between them. That ratio changes. At 3300 rpm the ratio is 1.59 TQ to HP.
So, it depends on the rpm. You can't just double the max hp and get torque. If you happened to know what your horsepower at 2600 rpm was, then yes, you could double it.
Your max torque is probably around 600.
So, it depends on the rpm. You can't just double the max hp and get torque. If you happened to know what your horsepower at 2600 rpm was, then yes, you could double it.
Your max torque is probably around 600.
The Peak Torque to Peak HP ratio is 2:1... This is something confirmed by not only our past dyno's, but just about every IDI ever dyno'd. My numbers extrapolated per my last dyno run, in which my setup hasnt changed aside from the intake manifold, which probably gained me minimal, but didnt change the curve, gives me 694wtq @ 2200 RPM... Thats close enough to 2:1 to confirm that...
NMB2 is probably just north of 700...
Postmaster
Joined: Dec 2004
Posts: 2,941
Likes: 30
From: Maple Valley, WA
So I am not sure if they gave me the correct sheet for my truck. The sheet shows my max power at 332.1... I really don't think this is mine!!!! I could have sworn the screen was showing 125 max power when they were dynoing mine. Should I give them a call and see if they kept track of whose dyno run was whose?
Duane
Duane
I think your numbers were flawed from the beginning anyway, Obviously the 340 number isnt right, and I think the 125 number is severely low for the factory turbo, especially since your timing was right on for your setup... You should have seen about 175 at the very least.
I dont think calling them will do much, I was watching the screen when you ran, and the numbers were up there as well... I think it has to do with the guy operating the dyno...
Thread Starter
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Elder User
Joined: Feb 2012
Posts: 888
Likes: 2
At 2600rpm, the ratio is 2 TQ to 1 HP because of the mathematical relationship between them. That ratio changes. At 3300 rpm the ratio is 1.59 TQ to HP.
So, it depends on the rpm. You can't just double the max hp and get torque. If you happened to know what your horsepower at 2600 rpm was, then yes, you could double it.
Your max torque is probably around 600.
So, it depends on the rpm. You can't just double the max hp and get torque. If you happened to know what your horsepower at 2600 rpm was, then yes, you could double it.
Your max torque is probably around 600.
You don't understand. I am not talking about a specific rpm. An engine configuration will hold close to a certain max tq to max hp ratio.
I just plotted out the rpm and hp numbers from my dyno sheet to hunt for peak torque....
@ 2600rpm I have peak HP of 345, that makes torque 697 @ 2600
My peak torque is actually higher than I thought. On one pull peak torque would of occured @ 2250rpm, where I was making 325rwhp. This equates to 758.62rwtq.
Thread Starter
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Elder User
Joined: Feb 2012
Posts: 888
Likes: 2
Duane... if you call and ask for margo, tell her who you are, and she can get you your sheet. They save all of the runs.
What happened was that 6.0 that ran before you, was not deleted from the screen before you ran, so they gave it to you, thinking it was your highest run.
What happened was that 6.0 that ran before you, was not deleted from the screen before you ran, so they gave it to you, thinking it was your highest run.
Thread Starter
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Elder User
Joined: Feb 2012
Posts: 888
Likes: 2
Here is a great video Pat put together of my runs. @ 1:46 you can see all of my dyno pulls. The one weird looking curve that's shifted way to the left was me using the vehicles brakes to load the truck and try to spool my charger, I let out very early, as you can see, but it showed me what I have capable for a peak torque.
justins truck - YouTube
and pats Gasser
http://www.youtube.com/watch?v=s1wGmb5xqeA
justins truck - YouTube
and pats Gasser
http://www.youtube.com/watch?v=s1wGmb5xqeA
Senior User
Joined: Jan 2003
Posts: 123
Likes: 0
From: Graham wa
Duane... if you call and ask for margo, tell her who you are, and she can get you your sheet. They save all of the runs.
What happened was that 6.0 that ran before you, was not deleted from the screen before you ran, so they gave it to you, thinking it was your highest run.
What happened was that 6.0 that ran before you, was not deleted from the screen before you ran, so they gave it to you, thinking it was your highest run.