Ad: Log Dyno - Measure Horsepower & Torque from your Datalog

[keninger]

Hello Everyone,

I would like to show you what I have been working on the past couple of months. It is called Log Dyno for Android and iOS. Log Dyno can measure Horsepower and Torque from your data logs. The first question which comes to mind with an app like this is how accurate is it? You have to remember Log Dyno is not only an app, but it also is a tool and it requires accurate data for accurate measurements. I have had multiple people visit a dyno shop and measure their cars on the dyno, and measure them with my app. The app turned out to be very accurate, in cases where the measurement was a bit off, turned out users put in the incorrect weight or gear ratios. After inputting the correct values, they were very surprised to see how accurate the app was. The accuracy of your measurement will depend on how accurately you input weight, gear ratios, environmental temp etc.

N54 335i
Log Dyno VS DynoJet

Calculated Shift Points
While measuring performance from a datalog is a great feature, there is another feature which I believe to be even better. Calculated shift points is a feature, where an algorithm analyzes your torque curve and based on that and your gear ratios, it will recommend shift points for each gear, which ensures that you are always putting down the most power available. These recommended values could be really useful while tuning auto transmission's shift points.

Interactive Measurements
After you get the result, you can name it and save it, so later on, you can load it back again and analyze it, modify values or email it.

Compare Measurements
You can compare up to 3 measurements, this way you can compare tunes, fuels, mods or just overall powerband as any measurements can be compared, they don't have to be from the same car. Here is a great example, a tuned 335i E92, and a tuned 325d E92, as you can see even though the diesel has nice torque down low, it can't hold it for long. (The car had issues though, but great for an example)

Compare Tunes

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Corrections:
● SAE J1349
● STD
● DIN 70020
● ISO 1585

Power Units:
● WHP
● BHP
● PS
● KW

Torque Units:
● LB-FT @wheel
● LB-FT @crank
● NM @wheel
● NM @crank

Once you have your car set up, all you have to do is: open up your datalog, specify how much additional weight you had in the car, how much fuel you had in the tank (This is for calculating weight), environmental temp, pressure, and humidity is also required for correction factors, but there is an "Auto Weather" option which will pull the environmental values automatically if your log is a recent one.

A short video to demonstrate how easy Log Dyno is to use

Google Play Link

iOS App Store

User's Guide

If you have any questions or need any help, feel free to Email me!​

 

[NoGuru]

Interesting looking app. I might give it a try when I pull my car out of storage.

 

[keninger]

Interesting looking app. I might give it a try when I pull my car out of storage.

I forgot to post the user's guide, but you can email me anytime if you have questions. User's Guide

 

[Torgus]

$10 bucks eh?

Why don't you show some specific N54 examples of how close the log reads to the actual dyno? Probably the best way to get sales.

 

[keninger]

$10 bucks eh?

Why don't you show some specific N54 examples of how close the log reads to the actual dyno? Probably the best way to get sales.

What I have shown you is exactly a 335i N54 dynojet dyno vs Log Dyno

 

[Torgus]

Why not something more independent, no offense but you could obviously make them look the same/similar.

Like grab a log from a single turbo dyno pull and graph it, then let the user upload his actual dyno graph and let's compare. Seems a much more fair way to prove the accuracy of your graphing technique based on a log.

@suspenseful @budgetbimmers

 

[keninger]

Why not something more independent, no offense but you could obviously make them look the same/similar.

Like grab a log from a single turbo dyno pull and graph it, then let the user upload his actual dyno graph and let's compare. Seems a much more fair way to prove the accuracy of your graphing technique based on a log.

@suspenseful @budgetbimmers

It is very far from a simple graphing technique, there are a ton of calculations going on based on data, and the final values will be the graph points.

I have previously contacted both of them who you tagged, but they didn't have the time nor were interested. But I have 150+ customers already, and they are happy with the results. I had multiple people go to the dyno and they had accurate readings. Have you had your car dynoed? If so, I am willing to give you a promotional code so you can download the app for free and try it for yourself.

 

[keninger]

One very important note though, you can't use your log from a dyno. It needs to be a street log, that's why weight is important.

Edit: You can use your log from a dyno, but numbers will be off. The curves will look like they should, so calculations for shift points will be perfect. (Drag Coefficient or Drag area value needs to be zeroed out in case of a dyno log)

 

[SlowE93]

What I have shown you is exactly a 335i N54 dynojet dyno vs Log Dyno

View attachment 22544

While the numbers are there, the curve is not. So how is this supposed to accurately tell you best shift points, etc based on curve if its not accurate ?

 

[SlowE93]

Why not something more independent, no offense but you could obviously make them look the same/similar.

Like grab a log from a single turbo dyno pull and graph it, then let the user upload his actual dyno graph and let's compare. Seems a much more fair way to prove the accuracy of your graphing technique based on a log.

@suspenseful @budgetbimmers

This is a good idea. Im on twins but we can do this if wanted. I have tons of logs and dynojet dyno sheets.

 

[keninger]

This is a good idea. Im on twins but we can do this if wanted. I have tons of logs and dynojet dyno sheets.

The curves look a bit different because scaling is not the same as you can see from log dyno the tq scale start from 0 to 500 and on the dynojet it starts from 200-500. Please email me regarding testing.

 

[martymil]

Looks like a good idea but needs independent testing, there are free tools that already do this.

 

[keninger]

Looks like a good idea but needs independent testing, there are free tools that already do this.

It is not an idea, it has been proven multiple times that it is working. I am confident about the app's performance if all the values are input correctly.

The best thing about this app is that you can always get a refund, you have nothing to lose. There hasn't been a single case previously where I was unable to help a user who contacted me. [email protected]

This is how a perfect measurement base log looks like. Look at the rpm, no spikes: Datazap Log

Most common mistakes:
-the user put in the wrong gear ratios
-wrong weight
-wrong current gear for measurement
-depressed clutch at the end of measurement so rpm jumped up at the end of a measurement
-used a log from a dyno (you would get the same curve but numbers will be off, still good for shift point calculation)
-wheelspin causes spikes and throws peak readings off

 

[langsbr]

One very important note though, you can't use your log from a dyno. It needs to be a street log, that's why weight is important.

Edit: You can use your log from a dyno, but numbers will be off. The curves will look like they should, so calculations for shift points will be perfect. (Drag Coefficient or Drag area value needs to be zeroed out in case of a dyno log)

You should absolutely be able to use your log from a dyno run, and it would ideally be the MOST accurate. All you need to know is the weight of the drum. If I recall, the dynojet drum is 2400lbs, so in essence you are doing a pull in a 2400lb car, and there's no wind resistance, no slope.

This is a software app and it follows the GIGO principle - garbage in, garbage out. I've yet to use this particular app - I've been using Virtual Dyno for years and it's incredibly accurate.

Another thing I recommend is, unless you know for certain that the road is 100% flat, you should make 2 passes, one in each direction, on the same spot of road, and average the two.

 

[keninger]

You should absolutely be able to use your log from a dyno run, and it would ideally be the MOST accurate. All you need to know is the weight of the drum. If I recall, the dynojet drum is 2400lbs, so in essence you are doing a pull in a 2400lb car, and there's no wind resistance, no slope.

This is a software app and it follows the GIGO principle - garbage in, garbage out. I've yet to use this particular app - I've been using Virtual Dyno for years and it's incredibly accurate.

Another thing I recommend is, unless you know for certain that the road is 100% flat, you should make 2 passes, one in each direction, on the same spot of road, and average the two.

Yes you are right a dyno log is actually perfect due to being the best possible scenario to log traction wise.

I only advise people not to use logs from the dyno, because they open it up, input all the values correctly and get off numbers, and then they see that the numbers don’t match the ones on their dyno sheet and then assume the app is not working properly.

But for more advanced users, as you said you can 0 out the wind resistance factor by zeroing out either variables involved in that calculation for drag. After that you can adjust additional weight until you match the dyno numbers.

But for calculated shift points, numbers don’t matter. Even if you set weight to 10x higher you will see that it only affects numbers, but doesn’t cause uneven change on the curves. Only drag values affect the curve unevenly.

 

[keninger]

A new update is available, the most key feature:
-Touch any CSV file in your File Browser and it redirects your straight to Log Dyno and opens up as a measurement.
If you follow my provided naming conventions, then it fills out the measurement data automatically (like weight and environmental values) and you get your measurement with one click.

Here is the User's guide it has been updated, it explains everything: User's Guide

iOS version is coming in around 2 weeks.

 

[gmagnus7]

Even if its somewhat close I think it's a cool idea for most people who don't care about getting 100% accuracy, but want to know a rough estimate for curiosity sake. I think it's neat, good job. Obviously if you wanted to know exact numbers there's no replacement for a dyno.

Could be useful for seeing rough gains from different mods without dynoing each one?

 

[keninger]

Even if its somewhat close I think it's a cool idea for most people who don't care about getting 100% accuracy, but want to know a rough estimate for curiosity sake. I think it's neat, good job. Obviously if you wanted to know exact numbers there's no replacement for a dyno.

Could be useful for seeing rough gains from different mods without dynoing each one?

You can compare tunes and mods very easily because you can load up saved measurements at any time.

It could be 100% accurate, just like a Chassis Dyno, calculations are consistent so it really only depends on your datalog, but you need to be very accurate with details like additional weight. Also if you want 100% accuracy, then measure your car with a full tank of gas, because in most cases your car's weight won't match the factory specs.

 

[Jeffman]

I think knowing if certain mods or tuning adjustments make a power / torque difference is probably the most valuable aspect of this. Whether I am at 420 or 440 HP is not as important to me than knowing whether newly gapped plugs and/or a tuning adjustment made a real difference in the logs.

 

[Rcboosted2007]

Is it Snake oil app or good to go?