Full Delkevic exhaust, no cats, and Dynojet Autotune

[jwolffie]

If anyone is using a Dynojet PC5 and an Auotune let me know what you think
I upgraded my Delkevic 18 inch slip on to a full Delkevic system and added a Power Commander V with a Autotune module. I am running the stock air filter and I have a Guhl reflash that I got when I added the muffler a couple of years ago. I run it with the baffle out.
I decided to use the Autotune instead of having it set up on a dyno, so far it seems to have a lot more throttle response and more power from 2500 RPM and up. It lost a little power off idle but not enough to matter. I wasn't sure after reading the instructions if this made it work like a closed loop system instead of the open loop system we all have so I asked Dynojet tech support and here is the reply
"Hello Jon, anytime the AT is running, it is creating trims in the TRIM table(s).  These are created and used in real time until you retrieve the map and either clear or apply them.  The AT has a limit of + or - 20% that it can adjust by default.  If you hit this limit in a cell, it cannot make any more changes in that cell until the trims are cleared or applied, otherwise it will run and adjust all the time."
So, yes it works like a closed loop system.  I am not going to accept any suggested changes from the Autotune system and just let it decide what is best for the current days condition.
I decided to load a map that makes zero changes to the trim tables and a Air/Fuel map from a full Muzzy dual system as that was the closest one I had. I have tested it for a week now and I checked the suggested Autotune trim table and it isn't making any huge adjustments. I accepted the trim values and saved the map just for reference and loaded a new map that is still a zero trim map but with slightly adjusted A/F tables. I leaned it out just a little in my low throttle cruise range for gas mileage and richened it up in the top end high RPM and load range for power. I am going to try this this week and see where the trims are. I also upped the trim range to +/- 25% because I am running it as a closed loop system. Most cars can adjust 25% short term plus 25% long term trim for a total of 50% so I don't see a problem there. My gas mileage this week was about 3 MPG better than before the changes so so far so good. 

[maxtog]

I wasn't sure after reading the instructions if this made it work like a closed loop system instead of the open loop system we all have so I asked Dynojet tech support and here is the reply [...]So, yes it works like a closed loop system.

Does it?  Did you install an oxygen sensor?  My understanding is that a "closed loop" is one in which the computer can directly detect the output/results of its initial mix and adjust accordingly, which requires an O2 sensor.  Perhaps my understanding is incorrect.

[jwolffie]

Yes, It uses a wide band Oxygen sensor installed in the primary pipe to make it a closed loop system. It seems to be working because in cold air it is using more fuel with the denser air according to my instant MPG display. It sounds better too without the cats and there is less lag on freeway acceleration.

[maxtog]

 

[jwolffie]

Update
I decided to go with Ivans flash and no longer have any need for the power commander, in fact he said not to use it because it is slower than the stock ECM. It is an amazing difference, tons of power and no abrupt throttle cut off in turns with the throttle closed. It runs and feels like a 1400 now.

[maxtog]

Yep, I keep telling people, the C14 simply MUST be flashed.  Exhaust, PC, nothing else matters, what does is flashing it.  It is then a different (and much better) bike.  Easy-peasy.

[connie_rider]

When I first saw this discussion, I started to ask you about why the Tuner and not a flash.
Thanks for the update on going to a Flash, and the Tuner/ECM explanation.

Next question is; Are you satisfied with the Full Delkevic exhaust ?? Do you feel that adding it "and" the Flash gave you more improvement than just a slip-on and flash?

Ride safe, Ted

[jwolffie]

I had the slip-on and a Guhl flash before I ditched the cats. This took it to another level, I should have done this a long time ago. It is like a different bike now.

[CDII]

Full Delkevic system & tune here too. Slight loss on the bottom end but 6500 up pulls hard. Much cooler too. Works for me.

[connie_rider]

I agree that the header and flash took it to another level.
I'm asking if either of you ran the bike with just the header (added to whatever you had on the bike), and did "adding just the header" make a difference?

NOTE: I have a OEM 2006 ZX-1400 system on mine, dual Area P Slip-on's, and a Mountain Runner Premium Flash.
           I started my project with just a Slip-on, then added an earlier Flash, then added the header, and then upgraded Flashes {in steps}
             until I got to the MRP.
           Each step was an improvement.

Ride safe, Ted

[CDII]

Yes I did Ted.  Had Tune & slip on. Then added header.
Opened up the top end. Took a little off the bottom.
 My pillion doesn't mind it that way! 

[connie_rider]

Thanx CD. That is what I was trying to find out.
Delkevic was in contact with several of us as they developed the system your using.
I feel that they did a good job.

I don't know which Flash you have, but I'm assuming that you don't have one that is specific for the Delkevic System?
So, are you going to do the next step and update to a Delkevic specific Flash?

In my case, there is not specific Flash for Ted's home-made header system. {as it's a one of a kind}
I'm very happy with my system and the Mountain Runner Premium that I'm using.
But the Devil on my shoulder keeps saying "there might be more POWAH out there"... 

Ride safe, Ted

[CDII]

I'm suffering from the same thing Ted. We always want MORE!