I have stumbled onto something very interesting comparing two very close dyno sheets on the same dyno same day. I would like some input on a few things.
One is mine and one is from Nates truck. They are close in power, differ GREATLY in torque and rpm. I want to know if the "fast" injectors are the reason for this or is it something completely different. They could make a LOT more power with those injectors and still not see the torque stresses that I am seeing at that power level.
Is it due to the faster injection cycle that lowers the block splitting torque or is it simply that they peak at higher rpm where the torque is tailing off. Either way they are gonna be making a lot more hp without all the stress.
If my math is correct and that truck made 1050ft/lbs it would be at 675.5hp this will be pretty impressive when it is all completed.
Thanks for any input. I hope you don't mind me using your graph Nate.
Nate's dyno runs were made using only 1.5ms of injector pulsewidth. How many milliseconds max is your tuning running say during your dyno run? More power could have been made across the board if more fuel was given to it.....
I knew that they were barely using those injectors (I didn't want to say the pw). I have no idea what my pulsewidth is.
I was very impressed in the fact that his setup made the same power as mine with considerably less torque. When he finally unleashes a little more of that capacity its gonna be impressive. I thought that lowering the torque and increasing the hp was bs until I looked at this a little closer. He will be WAY more power with equal torque, helping it stay together.
I am wanting a set of these for a drag truck, just trying to figure everything out.
You would be even more impressed to know how little timing was being run to make those numbers (far from optimum)...... The combo definitely needs some more timing, but we were having little mechanical issues like a pregnant radiator hose and a late night that made us stop where we were.
I can't make any claims as to whether its the FAST Injection rate, Matt's GREAT ability to tune the truck, Davids cam grind, or the huge 126mm Turbine wheel in my atmosphere charger that let me get that high in the RPM band with only 1.5ms of fuel, but I LOVE IT!!!
We are still working out the bugs in it, and no it may not be making a $hit ton more power yet, but I am very happy with it. It will still drive like a normal everyday driver and when I press the go pedal the chargers come up and by the time you look at the speedo its buried in a matter of a couple of seconds. That is what the main objective for the truck was for me, and I have hit that goal, so more power will just make it that much better.
Matt was being VERY conservative in the timing, because we didn't want to throw a STOCK rod into orbit, but I will say that we will need more to make more power up top. Its physics guys, you can't throw X amount of fuel at something that is turning 2500 RPM's and then throw more fuel at it at 3500RPM's and not give it more time to start the burning process. I Believe that the next dyno session will be a lot of R&D with timing and more fuel...
Guess I better go find a good CP transducer...any suggestions?
Mine are 100% 238cc hybrids. I am prolly about maxed out with them, and Nates are barely cylcing. I do not know the pw of mine, but I would say they are close to empty and probably as good as it will do with 100% nozzles.
Maybe David can say what the pw is for my dd tune IDK.
The injectors in my truck Have a TOTAL displacement of 455cc's. That is when they are maxed out. We are NO WHERE NEAR using anywhere close to that much fuel yet.
In the Dyno Graph that Andy posted we were using 1.5ms of pulsewidth. That is 175cc's of fuel to get the job done.
Very, very impressive. You guys have put everything everybody has talked about and put it to functional use. Really cool stuff, can't wait till you turn the wick up some.:bowfast:
I think whatever is going on to make good power and keep the torque a little lower is great, and will prove to make more power than has been possible without windowing the block.
I am still excited to see what is going to come from the old 7.3 this year. Keep up the good work.
You can take away the torque from the bottom in tuning, but you can't add the power up in the RPM range with tuning alone, it takes air and fuel to make power in the upper RPM's even if you have the fuel you have to add the air. You do that with a cam.
It would be very good to have a dyno the same day, same machine, and same truck with and without a cam to see its benefits. I realize that this would cost a great deal of money, but it would sell the hell out of an aftermarket grind.
Even if you took a truck with Big Oil and ran 238cc hybrids and then ran the 455cc "fast" injectors to see what the difference would be in torque reduction and power gain. Of course tuning would have to play a big role in these differing injectors.
This may have already been done IDK. I am sure impressed with Nate's numbers (even though he is barely using those injectors) and would like to see some more fuel thrown to it.
This is what we need to do to be competitive with the 7.3. I am confident that things will come together and the old 7.3 will not be overlooked anymore.
I know nothing about tuning, injectors or cams, but I can see on his graph that something is working in a way that will produce more power and keep his engine together.
Can someone help me out on this one, atleast in the snowmobile world i always set customers sleds up (clutching) to run at the highest torque range not its peak hp because the sled is faster from point A to point B this way. Wouldn't you want alot of torque for these heavy trucks because thats what gets them moving not hp, especially for towing. :shrug:
speediseverything, torque is what's been causing window'd blocks since the dawn of time, hp doesn't break things, torque does
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