Great piece of software you got here.

I've followed threads you've been involved with on some of the Hemi forums and couldn't resist, so I bought a copy! I believe I have the latest version (v2010.110) but I don't seem to have the "lock" feature where two graphs can be compared... do you think I need to reinstall it or something?

Also would you mind giving your thoughts on 2nd gear "pulls" as far as effect on hp/tq numbers?

I drive an SRT8 Hemi with a 5-speed auto. My 2nd gear is 2.19:1, 3rd is 1.41:1, and 4th is 1:1. I haven't done 3rd or 4th gear pulls yet but numbers from 2nd gear pulls look WAY low. Even though I'm new to the software I've followed enough to know how to correctly input all the parameters, and I understand TT Dyno to be remarkably accurate in terms of correlating well to actual dynos. So I'm a little concerned that maybe my car isn't running properly... unless the pull in 2nd gear accounts for low readings.

Oh, yes I do have the lock feature then. I thought I saw it in a different location before.

Here's one of my 2nd gear pulls showing about 300/300 hp/tq. With 25% loss I get 404/398 which still seems low. But if you're showing 330/330 with tune and filter, idk, I'd have to say 300/300 on my 100% stock machine can't be far off.

Further below is a 3rd gear pull showing 357/348 hp/tq. With 20% loss its at 446/335, where I'd expect these numbers to be closer to the 2nd gear values at 25% loss.

I might be getting a little confused here...but I do concede the ballpark nature of these loss figures.

I have to admit I'm having tons of fun with this and appreciate your expert feedback.

I completely agree with good consistency being the best indicator. I've decided that I'll no longer do 3rd gear pulls on public roads because the top end is just too high. I have a nice stretch that I pull onto out of my subdivision that's mostly flat, mostly barren, and no problem getting up to 80mph on. So with a patch of road selected to be used everytime, my next consistency problem is throttle control.

The pulls below were done within a few minutes of each other... on exactly the same stretch of road. I think the correlation would be quite remarkable... if I had just operated the throttle more similarly in each run. Correct me if I'm wrong, but I think the differences on the low-end are due to how quickly, or not, I mashed the pedal. Even though I believe these are both valid runs, it's impossible to compare avg tq because of whats happening below approximately 2500 rpm.

Do you agree?

If I wanted to compare avg tq, which I do, it seems that I need to edit the csv, lop off data points below about 2500, and then reload. I haven't tried it yet but I'm sure the tool will accept user edited files like this... and then its now possible to custom arrange any rpm range you want, right? Along these lines, what are the odds of you incorporating an rpm range selection feature into TTDyno?

Final thoughts, this time about the differences on the top end. I *believe* the solid curve is where I bounced off the rev limiter. Why does the tool show a premature dip when this happens? The dashed curve is where I was able to let off the gas almost exactly as I hit redline and which is where... 6200 rpm... I'd expect peak hp.

Can you offer any tips in being more consistent on the top end?

Ahh ok, only the last 2000 rpm for avg tq calcs. And thanks for the explanation about how the tool ends the runs. I've been playing with it quite a bit lately and it really helps to have a little insight into what the SW is doing. One thing I've noticed recently is that, on occasion, there's a discrepancy between the KR-ST max value plotted in TTdyno and the KR-ST max value shown when I replay runs in the Diablosport Dataviewer. Have you seen this before?

Another issue I'm running into at times is that my auxilliary PIDs seem to disappear once in a while. Several times I go to plot IAT, for example, and ttdyno gives me a blank auxilliary graph. The first few times I thought the Trinity mucked up the data, but when I view in Dataviewer, IAT is there.

Here's a case of this, or something possibly related, happening. I modified this csv file by deleting about 5MB of unneeded data at the beginning of the file. Now when I plot in ttdyno, KR-ST does not plot or appear as an auxilliary PID... yet it exists in the csv file. Any idea for what needs to be done to get KR-ST to show up when I plot this file?

http://docs.google.com/leaf?id=0AoIzNq_s9RArdDNLcXpRNEFoUFh4QXR3WU5UVlJ6ZGc&sort=name&layout=list&num=50

I haven't paid much attention to whether ESP is on or off, so you may be right about the blip. As far as I know the ESP button functions the same on all SRT's: a single press disables it a little bit and an extended press disables it further, but not quite 100% off. As far as I understand the closest we can get to turning it 100% off, including aftermarket and DIY mods, is to use dyno mode in the Trinity or Predator. I'm off for some more testing! 

Any idea what the parasitic losses are on the Jeep SRT8? Gotta be pretty high. She only put down 392/384 on the AWD chassis dyno, yet runs 11's @ 115, so its gotta be at least 25% if not more. Waiting for the password to see what this software says she's putting down.