I posted this on the Innovate forums. I am cross posting it here so most of the DIY tuners can be aware of this. This is a 100% true story that I experienced first hand.

http://www.innovatemotorsports.com/f...ead.php?t=5428

 

Funny thing abuout that story is that the wideband on a Dynojet is made by innovative (I believe). May have needed a new sensor. Not a good reason to judge a whole brand of dyno based on this one story.

 

Wrong...The MUSTANG dyno wideband is made by Innovate.

Do some research and you will find how inaccurate the dynojet wideband is. I used to think that the dynojet wideband is accurate until I ran into this problem. It is a VERY VERY bad wideband

 

WRONG(RELAX)

 

WTH!!! Who is wrong? Me or Evotech? I can tell you with 100% certainty that the Dynojet wideband is NOT made by Innovate.

 

ok fine but it sounds like you're gonna have a heart attack

 

Does this mean that all readings on all Dynojet wide bands are skewed?

 

Almost all widebands use the same sensor..Bosch unit

 

No...It just means that the dynojet wideband CAN be inaccurate and inconsistent at times. Do you want to tempt fate? Personally, I will hook up my innovate wideband whenever I dyno my car or any of my friends' cars.

 

You shouldnt rely only on wideband only to tune the car. when we tune cars at the shop we use wideband, egt, and check spark plugs to see signs of what the car is doing.

 

For the most part the dynojet wideband is accurate. Only difference between the mustang dyno and the dynojet one is probably the wideband controller. The reason you see the inaccuracy is because some shops fail to keep up there wideband sensor and replace it when necessary. Especially the bosch sensor since it has a short race gas life and what do most people use on the dyno, Racegas. Dynojet sensors are bosch sensors, and of course it would be nice if you can go to the vw dealer and just by a replacement, but no they decide to change the connecting harness so you have to purchase it thru dynojet which sucks because it costs more even thought it is the same 50 dollar sensor from VW. If you have your own wideband that you keep up then you can always match what your wideband is saying vs the dynojet.

 

I mostly agree. I have zeitronix wideband and feel it has been most accurate consistent performer. I have AEM one in another car, it is fine. I have Dynojet Power Commander too in another car. IT is fine. Innovative is not better than the rest. So far Zeitronix is my favorite and the one I trust the most.

ROAD/RACE

 

I reviewd the comparison of those wideband logs.
The results are not way out of wack at all.
I can see where one wideband was off by 1/2 point or a full point, but .2-.3 points (11.01 vs 11.30) is not something super critical, specially under different circumtances, different fuel and the exchange for a test pipe.
21-22 psi is low boost, and the timing the car was tuned for is not real agressive. And, 11.2 to 11.4 Air Fuel readings are not a lean reading at all. I think 11.1 to 11.4 is still rich.
I don't think your concern is something to loose sleep over.
The hi octane took care of the knock. Keep searching for another issue.

 

The dynojet wideband IMO is the worst of the bunch. You are a Zeitronix vendor so you have a vested interest in saying it is the best. If you were an Innovate vendor, then you would say that it is the best. That is the way it goes with vendors. For the most part I do not trust any of the vendors.

 

The results were out of whack enough to cause 12 counts of knock. The octane flag was decrementing so badly after we did four logs that it hit 88% down from 100%.

The fact that 100 octane cured it all, and the timing was tame, tells me that it was more than likely the Dynojet wideband that is the culprit.

Tuning on 91 octane makes the car very sensitive to any little AFR change. 0.3-.4 AFR difference will make a difference on CA 91 octane.