Datamaster File

M

MAK

New member
I did a couple runs on datamaster and could use a little help. The TY is being held back dramatically by something and nothing seems to stand out to me on the log.

For reference, I have a 20G 14cm turbo, RPM CAI, 3 bar map sensor, MSD Blaster, TurboTweak VeloSYTY chip, stock torque converter, 3" cat-back exhaust, Walbro 255 fuel pump, 160 deg thermostat, larger IC pump, stock injectors, replaced vacuum lines, stock ignition control module, newer plugs-rotor-cap.

I have 2 files.....test1.uni was with the map sensor set at OEM, test2.uni was set at 2-3 bar setting. The very last "hard" run was a moderate boost launch on both logs. The RPM's got high on the second run because I forgot to put it in OD....too busy watching the laptop.

The TY has an obvious surge during hard acceleration and wants to go fast but cant. I did not notice the check engine light come on while doing these logs either. I am guessing it is a fuel issue but would very much appreciate someone with more experience looking them over.

Anybody up for it? I can email them to you directly.

:tup:
 
M

MAK

New member
Re: Datamaster File

Thanks, Randy. I do not have the WB 02 yet but I do want to get one soon. I know they are important, for sure.

The DM logs I have reflect the settings shown in my first post. Something does not seem right with fuel (I think) and I probably need to adjust something on the Velosyty chip settings. Hopefully that is all it needs. I know I also probably need a higher stall converter, possibly need to adjust the wastegate, and maybe even the TV cable but I do not want to start messing with things until I am sure of what needs attention.

The TY is close to being just right and it is frustrating because I am ready to enjoy it after it has been sitting for 6 months.

Thanks again.
 
randy merritt

randy merritt

Donating Member
Re: Datamaster File

The o2 MV reading jumps out to me and indicates a lean condition. Fluctuates between 500-800 at WOT. The timing on this chip is very conservative. On your first run, you had 4 degrees of knock retard, and thus only running 8 degrees of advance. That will def. feel down on power. Your boost also fluctuates wildly. My truck has a manual boost controller, and the boost is rock solid. A wide band o2 is a must for you to see the actual AFR's you are running. I will try to post pic of the area of concern so others can chime in.
 

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M

MAK

New member
Re: Datamaster File

Don - I checked them out and the files downloaded for me. I will look into it.
 
randy merritt

randy merritt

Donating Member
Re: Datamaster File

See my recent run. Sorry; graph only, but you get the idea of stable boost.

dmrun.jpg
[/IMG]
 
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randy merritt

randy merritt

Donating Member
Re: Datamaster File

full view. notice stable AFR and boost. this did take a long time to get to, though. note O2 mV reading on file at "AFR tgt" of about 11. This is actual AFR when you run a wideband patched into ECU.
dmrunfull.jpg
[/IMG]
 
E

Eric Sy GN

Donating Member
Re: Datamaster File

I agree the O2 reading is showing lean. Your voltage is going low at WOT, dipping into the 11 volt range at times. Not sure why the boost is varying that much. Maybe something wrong with the wastegate or related hoses.

Even with the inj DC up around 95% it's showing lean. I would try to monitor fuel pressure under boost. Also, maybe the O2 sensor itself needs replaced.

I see the wastegate DC is moving up and down also, but only a 4% range. I wouldn't think the wastegate was that sensitive, but we could slow that down in the chip if necessary (I would have to reprogram it).

Regards,
Eric
 
M

MAK

New member
Re: Datamaster File

Eric - Did you download the files or reference the screenshot that Randy posted? I am trying to find out if they can be downloaded.
 
E

Eric Sy GN

Donating Member
Re: Datamaster File

I clicked the link and downloaded it. It took me to another page that had a "download file" button.
 
M

MAK

New member
Re: Datamaster File

Eric Sy GN said:
I clicked the link and downloaded it. It took me to another page that had a "download file" button.
Click to expand...

Good. Don had trouble with them earlier.

I am sure that once this thing is figured out I can adjust the chip or have it "tweaked" to solve the problems. Just takes time (and money, of course).
 
randy merritt

randy merritt

Donating Member
Re: Datamaster File

Almost looks like a bad O2 sensor. Eric, I am not very familiar with aftermarket chips, but it looks like the ECU does not go into open loop at WOT. Is this correct?
 
M

MAK

New member
Re: Datamaster File

randy merritt said:
Almost looks like a bad O2 sensor. Eric, I am not very familiar with aftermarket chips, but it looks like the ECU does not go into open loop at WOT. Is this correct?
Click to expand...

Randy - From what I read on powertuneplus.com it is in open loop until the engine is warmed up and it then goes into closed loop. That was my interpretation of what it stated, anyway.

As for o2 sensors, they are not that old, but who knows, could be bad.
 
E

Eric Sy GN

Donating Member
Re: Datamaster File

It is open loop at WOT. The closed loop indicator may still show closed loop at WOT even though it's not.
 
randy merritt

randy merritt

Donating Member
Re: Datamaster File

I am running Code 59, but from the Code 59 power point tutorial, which I would assume applies to Code 58 (stock) also, it reads:

"Closed Loop only happens at part throttle/cruise/idle; it doesn't occur at WOT or PE.

PE is "Power Enrichment".

My understanding, as it has been for some time, is that the ECU is supposed to go into open loop fueling under wide open throttle. In other words, it stops trying to hit a target AFR for a specific RPM based on feedback from the O2 sensor, and instead goes back to the fueling tables in the tune (be it a hardwired chip like you have or code 58 or code 59 tune installed via a chip emulator). It is possible that I have been wrong all this time, it has happened before.
 
Don W.

Don W.

Stab it and steer it
Re: Datamaster File

Weird. When I look at Randy's post of test1, record 1752 compared to my downloaded (got it to work) version I see two entirely different things. For example my version shows AFR target as a flat line at 10.0 in indicating no WB conection.

"Mac" you realize that changing the MAP setting in DM has no effect on the motor correct? It only changes what DM shows and DM should be set to match whatever MAP sensor you have installed then just leave that DM setting alone. Only then will DM show the correct boost number. Just checking based on the wording of your first post.
 
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