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Old 08-20-2018, 08:31 PM   #1
redrexmeister
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Default Dyno function of the AccesPort

Is the dyno function of the AccessPort any good?

I entered combined vehicle and driver weight (3650lbs), selected 3d gear test, selected rev range from 2500 to 6600 rpm, then ran a 3d gear pull in S# mode. The AP consistently showed overly optimistic values of 450+whp/wtq.

Definitely not even close for Stage 2 with some additional bolt ons. Is this AP function totally off, or I need to do something differently.
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Old 08-21-2018, 04:00 PM   #2
JSR84
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I think you answered your own question.

P.S. if you update you AP, you'll notice that option is now gone, if you need any further clarification.
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Old 08-23-2018, 12:20 PM   #3
X49
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I'd recommend downloading a free PC program called Virtual Dyno. Load your .csv logs into it, and it will provide some nice power and torque graphs. It's pretty accurate, but you need to be on very flat ground without big head or tail winds. For before/after comparisons of tunes, always start on the same place on the same road.
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Old 09-12-2018, 11:47 PM   #4
Prisana
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I can +1 for the virtual dyno
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Old 09-13-2018, 06:23 PM   #5
redrexmeister
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Thanks. I'll give it a try.

I found one here:
https://barnhill.bitbucket.io/



Does it look reasonable for Stage 2 on virtual Dynojet?

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Old 09-15-2018, 08:02 PM   #6
X49
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Nice midrange, but I'd say your torque falls off pretty quickly at higher rpms. You might be underboosting. You can tell a lot more from a datalog than a dyno graph though. If you upload the log to datazap.me and link it here, we can take a better look at the state of your tune.
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Old 10-04-2018, 12:46 PM   #7
redrexmeister
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I had the car re-tuned with Perrin EL header. The HP curve has a nice flat region, torque has a nice mid-range bump but starts to taper down. Tried several different options. More boost, did not make more power. Tuning for area under the curve. Opinions?



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Old 10-04-2018, 02:08 PM   #8
Charlie-III
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General comment on any "road dyno program/device", fantastic if you use it for before/after changes.
Crap compared to a real dyno.
Sheesh, comparing one dyno to another is crap, even if same brand and model.

I have used a number of things (started with a TSD formula, got some weights, did some numbers, did on a slipstick, early calculator, then spreadsheets), but MANY things change the numbers!

Flat ground.
Several runs IN BOTH DIRECTIONS!
Average numbers, then do graph.
Try for similar weather days (temp, humidity, barometer pressure, etc.)
Same fuel load.
Same crap in car.
Same wheels.

You have a bad set of plugs, tool box in back, low atmospheric pressure for first test, full tank of gas, hot and humid, then unload the car, empty tank, light wheels, new plugs, light flywheel, high pressure weather system 20*F colder, numbers are better.
You have changed many variables.
Even though the only performance thang was the plugs.

A real dyno can adjust for the weather.

What I would do......go to a local truck stop and get weighed, reset ECU, do test.
Do changes.
Reset ECU, retest.
All on the same day.

Alternate to a truck stop with scales is a gravel yard, junk/scrap yard, etc. They usually have scales.
Yes, you will likely pay something to get weighed.

The more variables you change, the less valid are the numbers, even for before/after numbers (again, forget comparing numbers on another day, device, location, etc.).

I and others get tired of the, "I have the same mods and tune as so and so, but my numbers are low, this is crap!" Posts.
Again, many variables, understand the numbers are from a simple set of values, then just a TSD formula (TSD = time, speed, distance.......it takes a certain amount of power to accelerate a mass at a given rate......maybe you should have listened more in physics class.....I never had physics......).

Yes, I am being a butthead, but I do understand how the numbers are derived.
Only exception is an engine dyno, but weather, pulley changes, also make a difference, but a lot less variables.
But who the frik uses an engine dyno for the street?
We mostly use a roll on dyno or some sort of software.
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