DynoJet Fudging Tutorial 101

It’s honestly pretty funny how far internet trolls and wannabes that want to take a bite out of you will go. News flash — I’ve been doing this for years and seen all the lies and dyno fudging one ever needs to see that will last a lifetime. Yet these “people” still seem to think tuning is all about power and racing their dyno sheets (fake at that) online.

But sure, I’ll show you how to make 20hp+ on a DynoJet without ever changing a thing and getting the ability to claim “there was so much wrong”. This is really juvenile internet troll behavior — but hey it’s the weekend, let’s spend a little time burning them down.

Start With a Potato Graph Baseline

baseMake it as hard to read any information as possible. For the sake of this blog post though — I want it legible so I won’t go that far. Not a single thing was tuned in the tune for these pulls. Not one. The tune is exactly the same.

Next add in the retune “baseline” graph –more– noting an amazing 18 increase, wow!

But hey we put in some more work, and more_conditions_screwednow the car is making 278hp, an amazing 26hp gain!!!!! WOW!!!

How is this even possible??

Fudging The DynoJet Broken Down

Let me be clear — anyone can fake any dyno to push whatever agenda they want. They’ve been doing it for years, this isn’t anything new.

So how did I get the numbers to go up without changing the tune (I can certainly claim I did and that in the base “everything was wrong”)?

Note how the curves are very similar — it really is the same tune. Very rarely will the overall curve of a “retuned” vehicle follow the same path if it’s a different tune. So the first thing you should note — the graphs are all individual, they are not overlayed. There is no correction factor listed anywhere on those graphs. So let’s shed some light.

base_conditionsHere is the base dyno making “252 whp”, but now with correction factor and smoothing used. We had an overall correction factor of 0.99 which made the numbers lower.

more_conditionsWhat do we have now? This is the “270whp” graph. We’ve switched to the STD correction factor, which is now an overall 1.01 correction — making the numbers read higher.

But that’s not all that’s changed — we also went from gearchangeusing 3rd gear to 4th gear, which “added” 10hp on it’s own, as seen here on the right. Note the “gear ratio” information — higher number is an earlier gear (3rd in this case vs 4th gear). This is not an unusual phenomena — dynos can and will read a bit different based on the gear you use.

But hey, for internet “facts” sharing — we just gained 18hp by fixing a tune that was “so wrong” — LOL?

It gets better. What if we mess with the dyno more_conditions_screwedweather station? Wow, we have an amazing 278whp now! I can leave the correction factor, gear ratio and all other analytical data off, just share these numbers and now I’m the best “tuner” in the world — I just made 26whp over someone else’s tune, without changing anything (but I can certainly claim I did — who’s going to know, right?)!

more_conditions_screwed_conditionsBut if we actually pull up the run conditions, note correction factor now — 1.04. With a very weird humidity… yup, the graph had someone screwing with the weather station. Here’s a news flash as well — it is relative child’s play to screw a DynoJet run, even AFTER it’s been saved. I can do this (or anyone else scam_examplewith basic computer skills) with any DynoJet run file someone sends me — make their graphs read “higher”.

Finally a 1:1 overlay to show you can even fudge a direct comparison if you want to.

And hey, as far as the Internet is concerned — if I post these graphs and just claim the base tune was wrong, who’s going to know, right?

Well I Know. M’Kay?

In conclusion? If you want to make your tooner friend look good, there’s legitimate ways, and then there’s BS ways. Spreading lies and false hope never helped anyone — you just lose any credibility you could of had as you and whatever friend/tooner/shop you are trying to “back up” is clearly a liar with no integrity. But hey, that’s just the game, right? Sure, but I’m not playing.




The Tooner Phenomena

Now I am sure this is going to ruffle some feathers and some might even dust off their pitchforks — so be it. It has to be said — living and breathing cars, modifications and tunes day in and day out you see some outrageous things come your way. I am going to break it down into two simple categories — food for thought and enthusiast beware.

The Expert Tooner

This is the guy that has a shop or works for a shop — they have a dyno and you would think they would know how to use it. In fact, some of them do know how to use it very well, and the break down begins with the fact they understand very little, if nothing at all, about EFI tuning and/or the engine management software they are using. Hell, they might even be working at a shop that has a stellar reputation!

They are able to post up amazing numbers on said dyno, but the vehicle will just run terrible either the moment it leaves, or a couple days later. When the car comes back to them — they cannot figure out the source of the problem and will at times chase mechanical gremlins that do not exist.

One prime example of this is a customer with a 2012-2015 Civic Si — said customer had some work done at his location and the vehicle posted up absurd power figures on pump gas (93 octane) — nearly 500hp. Anyone who has any experience with that platform will raise an eyebrow — maybe it’s possible? Highly unlikely with how knock prone those motors are. But hey, the customer was initially quite happy with the numbers — and then the bad news. After a couple of days the car would be completely gutless, and any attempts to have that behavior remedied kept failing.

He finally got a hold of me and we went over what was going on — turns out he was an existing customer of mine that had a tune for his car whnegative_timingen it just had bolt ons. After reviewing his turbo datalogs, it turns out it was running 17-18psi of boost and -2 to -6 degrees of timing (yes, NEGATIVE). It doesn’t take a rocket scientist to figure out this does NOT make power. In fact — it makes about a whopping 200 horsepower with all that boost, not anywhere NEAR the claimed dyno figures.

And yet it continues to get worse — part throttle closed loop feedback was disabled, the primary O2 sensor completely disabled, VTEC point untuned, VTC mapping completely untouched. No excuse for any of these items to be the way they were — so where was the break down? Upon inspection of the actual calibration — the tune file was basically nothing more than the calibration for his vehicle with simple bolt on parts. Quite literally the injector scalar (how big the fuel injector is) was adjusted and the fuel map was roughly skewed upwards in boost — nothing else in the calibration was setup anywhere close to how a turbo calibration should be done to get a reliably running vehicle. You read that right — he was running MY N/A tune on his car with a turbo. You can imagine how well that works.

So how did it make power on the dyno? Quite simply — with every flash of the ECU its “learned” parameters were reset and under boost the motor was seeing effectively naturally aspirated ignition timing. Wait, won’t this cause detonation? Absolutely — this platform does not have active knock feedback logic, only having a very slowly learned correction (which works poorly on modified vehicles to begin with) and the motor will definitely make power.

So the sum of his “expert” tune was nothing more than a couple of hits on the dyno with a calibration that was ripped (stolen) off the FlashPro when the vehicle came in for work to be done.

But a couple days later — the ECU goes limp mode to protect the engine. In this case — the owner of the vehicle was very lucky. We dialed the boost back to 11-12psi and tuned the car properly and it hasn’t had a problem ever since.

The Noob Tooner

You know who I am talking about here — they are all over social media and online forums. They will make you promises and whisper sweet nothings via private messaging systems to get your attention and make your wallet a little bit lighter. I have seen examples of them even claiming:

  • Tune just like “so-so” (enter tuner name here) for the same amount of $$$.
  • It’ll be just as good or better than “so-so”.
  • “So-so” is terrible and they’re better.

What skills, experience and accomplishments do they actually have? Well it’s quite simple:

  • They purchased a laptop.
  • Downloaded some free software.
  • And in many cases: stole a base file they are now using as their “source of truth”.

Yup — that’s right: all it takes to claim to be a tuner extraordinaire on the internet is a laptop and the ability to transform drivel that would normally flow through their lips into text via their fingers rapidly clacking away at their laptop keyboard.

Even better — in many cases they’ve even purchased a tune for their own vehicle from an established tuner. This has happened so many times I have lost count — I am more than happy to share examples with the reader privately.

But you bet they will be all over the internet trying to snag their next victim — sometimes advertising their services, sometimes trying to stay under the radar and snag their victims via the amazing stories they like to tell via private message.

And at the end of the day — they have little to no experience (you will see stuff like “I tuned my car”, “I tuned all my friends”) and no accomplishments of any kind. Of course they will claim that they “have to start somewhere”. Anyone sign their vehicle up as R&D when they paid for a tuning service?

Amazingly enough — they will always have someone “vouch” for them and their “skills”.

So What?

This is a vicious cycle — I’ve seen it so much that I just shrug and let our business and our work speak for itself.

But be warned — the tooners of the world will throw timeslips, dyno sheets and vouches at you all day long and in their minds it gives them completely credibility. Sure — going fast and big numbers are fun, but it paints a very poor picture of any experience or ability to tune a car properly to do anything beyond that. When you have a vehicle you need to drive day in and day out, there is a lot more that goes into setting up a tune than dyno numbers and time slips.

The goal is to hopefully share some insight with the reader and maybe prevent another case of Tooner Attacks. Ultimately it is up to every enthusiast to do their own research — and I encourage you all to do so.