Letting off too early on dyno?

[RonA]

I was just looking at my last dyno runs and it looks to me like I'm letting off the throttle too early. I penciled in the calculated rpm's. I think it was being shut down around 120mph. The 13mm pump is supposed to fuel to at least3500rpm. No load cell.

 

[dvst8r]

Sure looks like it was still climbing.

 

[GOT-Torque]

Ron, I thought it looked that way the first time you posted it. Had never seen a graph that just kept climbing until it was let up, usually power starts to drop off first before they let up.

It may have more left in it! Sure looks like it...

 

[dzlfarmboy]

Yeah did you not let the operator know what RPM to let off at? Usually we'll pick an RPM based on what they have done and what we both think we should spin it to then if if falls off real early we wont spin it as far for no reason if it's not making any more power up there but if it still looked like it was pullin give em that run for free and do another 3.

 

[RonA]

I don't have a tach. I told chris to stop when the speedo reached the M in mph (just past straight down on the speedo). Looks like I'm going to have to get a felt tip marker and mark a new stop point on my speedometer with this setup.

 

[paulb]

Ron,

It sure does look like there is more in it. You sure have that pickup running sweet!

Paul

 

[BrettWINspeed]

I was just looking at my last dyno runs and it looks to me like I'm letting off the throttle too early. I penciled in the calculated rpm's. I think it was being shut down around 120mph. The 13mm pump is supposed to fuel to at least3500rpm. No load cell.

I thought that was how your graph looked here as well, just kept climbing until they let off. I'd be curious too see what the higher rpm look like.

 

[RonA]

I thought that was how your graph looked here as well, just kept climbing until they let off. I'd be curious too see what the higher rpm look like.

This is from the LCD dyno. it at least flattens out a bit. This one was with the plate to the rear. The graph in the first post is with the plate in the middle.

 

[Joesixpack]

Yeah that first graph was on the way to the moon, has to be more there.

 

[dvst8r]

Extrapolating in my head, if that pump does continue to provide that same level of fueling to 3500rpm you should be over 900hp. Based on what little I know about the pump 13mm built p pump, I don't see why it wouldn't.

Looks like you are going to have to do a few more pulls till you get at least a plateau in the graph.

 

[2007 5.9]

Yeah Ron, when I ran it at LCD I had a feeling that there was more RPM in her. You need a tach to truly tell when to let off, your speedo at "M" is a little hard to see with so much going on.

Nevertheless, your truck is the "Sleeper King".