I get 265ish on all boost levels 1.7 and above.. so far i have cranked it up to 2.14. On pump(91) and meth (1.81Bar - I see 262 as the highest) .. anything after 1.87 BAR I logged with 100 and Meth.

 

Does yours peak between 5100-6000 rpm (260-265 load)? I've seen that number on others with 3076s around 1.7 bar. Are you not feeling any more torque at higher boost? I would think it should continue to increase with boost?

 

4900-5900 .. I have no seen any higher ...267 is the peak I have seen and it is NOT on the 2.14 BAR it is actually on the 1.87

 

Ari, it might even get better. I have a Mustang dyno of my tune so we could put the "theory" to the test: draw a graph of Durametric's engine load on top of my Mustang torque curve and see how close the shapes track each other.

Mine is just one data point though, subjected to errors; I wonder if other people have done the same to see how close the 2 values (dyno's torque vs. Durametric's engine load) are?

 

Today - I just realized ..I suck at Excel... (been a while since since Chem class )
1.81 BAR - 91 + Meth


2642.5 107.06
2693.5 107.18
2702.75 108.12
2747.25 109.13
2796 109.92
2806.25 111.12
2857 112.22
2899.75 113.13
2922.5 114.49
2969 115.71
3021.75 116.79
3057.25 117.89
3099.25 119.27
3141.75 120.68
3176.5 122.41
3227 124.08
3269.5 125.93
3320.75 127.66
3364.25 130.43
3412.5 133.24
3467.25 136.05
3513 139.38
3577 142.92
3628.25 146.51
3678 151.97
3755.25 159.05
3814.25 165
3896.5 173.06
3961.75 182.55
4047.25 193.62
4108.25 205.9
4184.75 219.7
4314.75 231.98
4401.25 239.77
4445 240.7
4554.5 244.34
4654.5 248.44
4774.5 250.64
4855.25 254.04
4973 258.05
5033 260.16
5188.75 259.85
5772.25 253.17
5371.5 260.88
5501.75 257.67
5505.25 261.91
5606.5 261.63
5665 261.26
5741.75 259.69
5883.5 257.81
5919.75 257.93
6043 253.13
6097.5 250.64
6209.5 243.94
6338.5 239.65
6308.25 241.01
6464.75 230.23
6547.75 231.19
6544.5 229.76
6592.75 222.47
6711.25 212.88
6773 214.27
6971.5 215.11
6873.75 214.8
6961.75 214.24
7084 214.2

 

I did this a few years ago when I first started the AUC thread. They match up pretty nicely (as predicted). I'll repost Champion's 68.

Champion Dyno 68s



VE Calculation

 

Not bad Ari! -- Don't shift next time. Just do 4th gear pull, just like dyno.

PS nice load curve -- your car must feel very strong!

 

Dave,

Asking so I understand this better: the lower curve is VE data from the same dyno, not from a separate *street* Durametric datalogging, right?
The reason I ask: it looks identical to the torque curve on the dyno sheet - even the little bumps on the curve.

What I am graphing is *dyno* torque versus *street* Durametric datalogging - not that it's "better," but to see how closely amateur Joe with Durametric could approximate a pro's dyno.

 

Tom at Champion kindly sent me the datalogs from the dyno run so the answer to your question is Yes. That's why they look identical (and should). Self verification mechanism.

 

Another 3076 turbo (Yousef's). You can see the tuning improvements made. I don't remember exactly what he did (it's been a while).

 

Thanks to Mod extraodinaire bbywu's fantastic help, and TTdude's explanation , I was able to run the following tests and graph the result. As always, any expert please feel free to correct as needed.

This particular post is not about power testing per se (although that is exactly what I am measuring); I am merely checking how well average Joe's Durametric street datalogging approximates pro tuner's dyno torque curve. Why is it important to me? If the match is close, it is evidence that this simpel test could be used not only to double check on your tuner's alteration to the program, but also to check any components (header, plenum, exhaust, etc.) you add to see if someone is blowing smoke up the a** (supposedly an actual attempted treatment for drowning in 18th century Europe :-)).

There were several limitations: the 2 test were done 4 years apart in vastly different conditions, this was my first time with Durametric and the number of runs were limited and were done in 3rd gear, not 4th gear, as I don't want to go to jail :-), etc.
Dyno: done in 6/2009, fan cooling with car stationary, 4th gear WOT on dyno, cooler ambient temp.
Durametric datalog: done in 5/2013, real world cooling with car moving, 3rd gear WOT on non-leveled road, hot desert day. I only did a total of 5 runs or so, a mixture of stock program and GIAC program.
Given the vastly difference conditions, I was impressed at the result and how consistent Durametric engine load value is. In both runs, the peak engine load hit 220. The graph of engine load versus torque are very close on up stroke and the maximum values of torque and engine load hit at near indentical rpm around 3500 rpm. The shapes don't match perfectly but I am certain with more runs, I would be able to producemore consistent results, enough to test components and tuners.
(PS Error in picture below, the stock torque curve is the one in blue with dash, not the red one.)

 

I did a few runs in a row without break in between at different power levels - Stock normal, Stock sport, GIAC normal, GIAC sport. This second GIAC sport curve (the one above was first) was the last run of the day. The upstroke of the curve has outstanding match, again peak engine load and peak torque came at same rpm and surprisingly consistent. Next part of the graph is not as pretty but as mentioned, given time and more trials, I believe I could get a "representative" curve that's good enough for evaluation.