Datamaster file

[Don W.]

Here is a recent DM file. o2's are running just over 1000. I'm curious if you think I'm running lean?

Or?

Comments appreciated.

http://www.sonic.net/~donpris/AutoLog_288.uni

 

[It's just a six]

Re: Datamaster file

I personally would not use milivolts output from your stock O2 sensor.Not that accurate is is very slow acting.
I suggest investing in an wide band reader.Innovate & there are others. :2cents:

 

[Tooky]

Re: Datamaster file

I agree with Rick. Judging by your sig, your truck has a lot of mods already. I would consider a wideband next. You can get a real nice one from www.moates.net for $240 with digital display. I run the $300 PLX M-300 from www.plxdevices.com.

For years when I first had my truck, I had a lot of knock and could never get a handle on the tune of my truck, especially with the Ultimate chip (for stock injectors). Once I got the wideband I found out that contrary to my O2 mV, I was actually running a WOT AFR around 13.3:1........ no wonder it would knock at WOT!!

It just goes to show that the O2 mV doesn't really have any "guaranteed" relationship to your WOT AFRs whatsoever.... no matter how much you wish it did (I know I did )

 

[Don W.]

Re: Datamaster file

I agree with Rick. Judging by your sig, your truck has a lot of mods already. I would consider a wideband next. You can get a real nice one from www.moates.net for $240 with digital display. I run the $300 PLX M-300 from www.plxdevices.com.

For years when I first had my truck, I had a lot of knock and could never get a handle on the tune of my truck, especially with the Ultimate chip (for stock injectors). Once I got the wideband I found out that contrary to my O2 mV, I was actually running a WOT AFR around 13.3:1........ no wonder it would knock at WOT!!

It just goes to show that the O2 mV doesn't really have any "guaranteed" relationship to your WOT AFRs whatsoever.... no matter how much you wish it did (I know I did )

OK guys, it's on the list. Thanks for the links.

What did ya think of the DM run otherwise? I'll confess, everything I've done so far has been either from scratch or what I could learn here. Much as I love the truck I suspect I'm still way down on the learning (tuning) curve.

 

[SCWolverine]

Re: Datamaster file

Hey Don, had a chance to glance at it (for what that's worth). Hopefully someone else will chime in and agree with (or disprove) what I noticed.

Somebody look at record #77. Speed=0, Boost=0, RPM=3550, Spark retard=5.6 Is this false knock?

I'd agree with you about running lean, looks like you run out of injector at the top of each gear.

I'd throw checking for loose things to the list (if that is indeed false knock), in my case it was the DP against the frame, but ymmv. Best of luck, keep us posted.

Best way to learn, keep it up!

 

[Tooky]

Re: Datamaster file

OK guys, it's on the list. Thanks for the links.

What did ya think of the DM run otherwise? I'll confess, everything I've done so far has been either from scratch or what I could learn here. Much as I love the truck I suspect I'm still way down on the learning (tuning) curve.

Hey Don, I had a chance to download and review your file. I'm impressed!! Your truck is running really well, this file reminds me a lot of my truck once I started getting it straightened out and touching the 12s. Your transmission looks like it's performing flawlessly, including the converter lock. Your ignition also looks flawless, judging by the perfectly smooth rise in the RPM ramps. Your knock is also perfect at nearly 0.0 the entire run.

Now for the problems. Your boost control is outrageously bad, but that's typical of a stock turbo. What wastegate do you have? Does your 3" DP utilize the WG puck opening on the stock turbine housing? If you could correct it more to a flat line, you'd gain a lot of power overall on the run.

One last thing. I noticed the program is "T1-20". But your maximum WOT timing is a paltry 12*. I bet you're running the latest release of the Ultimate chips (V9/V10). They scaled the timing way back to avoid knock on most people's trucks. But since yours appears to be running exceptionally well, I bet you could see a small gain by switching to the V6 (richer) or V7 (leaner) releases of the older Ultimate BINs. They still had the higher timing (more similar to what the stock GM chips used at WOT.) Just food for thought.

Once you get a wideband you can start to evaluate how rich/lean you're running right now, and possibly adjust it with fuel pressure or chip tuning.

Hope that helps, (amazing how much you can tell from a DM file!)

 

[Don W.]

Re: Datamaster file

Now for the problems. Your boost control is outrageously bad, but that's typical of a stock turbo. What wastegate do you have? Does your 3" DP utilize the WG puck opening on the stock turbine housing? If you could correct it more to a flat line, you'd gain a lot of power overall on the run.

One last thing. I noticed the program is "T1-20". But your maximum WOT timing is a paltry 12*. I bet you're running the latest release of the Ultimate chips (V9/V10). They scaled the timing way back to avoid knock on most people's trucks. But since yours appears to be running exceptionally well, I bet you could see a small gain by switching to the V6 (richer) or V7 (leaner) releases of the older Ultimate BINs. They still had the higher timing (more similar to what the stock GM chips used at WOT.) Just food for thought.

Once you get a wideband you can start to evaluate how rich/lean you're running right now, and possibly adjust it with fuel pressure or chip tuning.

Hope that helps, (amazing how much you can tell from a DM file!)

Ported stock turbo.

http://www.syty.net/forums/showthread.php?t=51684&page=2&pp=15

See post 29.

You should see my boost line before. :rotf: I would be great to flatten it more. Any thoughts?

I have some 50# injs coming. Sometimes I feel like the village idiot but what I need next is how to proceed. If I've got the cart before the horse then so-be-it. I just need someone to tell me. Sorry for the :rant:

 

[SCWolverine]

Re: Datamaster file

Any intentions of getting to the point of tuning yourself? Now may be the time (if you're seriously looking into a WB anyhow).

 

[Tooky]

Re: Datamaster file

You should see my boost line before. :rotf: I would be great to flatten it more. Any thoughts?

I have some 50# injs coming. Sometimes I feel like the village idiot but what I need next is how to proceed. If I've got the cart before the horse then so-be-it. I just need someone to tell me. Sorry for the :rant:

What are you using for a boost controller? If you are still using the Ultimate's "pushbutton" control, I would recommend trying a simple ball-and-spring boost controller; I use the one at www.boostvalve.com for $40. Basically you are taking the boost control into your own hands, for the sake of better performance, but you do lose the computer control. It may spool up faster with the boostvalve and most likely will flatten your boost curve quite a bit. On mine it was one of the best "bolt on" differences I ever did. You'll definitely notice the different control once you get one hooked up. Just have to watch and make sure it's not spiking or making too much boost.

I would hold off on installing bigger injectors; the Datamaster "Injector Duty Cycle" is really just a calculation (and I'm not convinced it's an accurate one, nor do I recall the author of the software claiming so). I have seen plenty trucks run into the low 12s and high 11s before they were out of injector. When you change injectors, you have to change your entire chip tune, which can open a real can of worms if you already have a tune that's working well for you. (Since you'd be throwing that away and starting over, basically.)

In other words, my advice is to run the stock injectors until your TRULY seeing them run out, via your wideband reading too lean at WOT. I also just remembered you have the Alkycontrol kit. I bet you would be able to run 11.50's with that alcohol kit and your stock injectors before you actually needed to upgrade the injectors. I did 11.79 with mine and a smaller alky kit.

-----

Ok, what to do next. I think you're being too hard on yourself. Your truck is actually one of the best setup stock trucks I've seen in a while, like I said earlier. To really take it to the next level, what you want to do is get the wideband and see where your WOT AFR's are right now, I bet they are unbelievably rich (10:1 or lower). Once you start leaning out the fuel injectors to get near 11.5 or 12.0:1, you will really start to gain some horsepower. At the same time you will need to raise your WOT timing from the 12* you have now, to at least 14-16*, and ultimately you could run 18* or more if you've really got an eye on things.

I am talking about a 50-100HP difference in your truck just by changing that WOT timing and leaning out the fuel. The power is already in there, waiting to be unleashed. With the right tools, these changes could be made in a day. Now that you know what you need to do, you have to find out how exactly you are going to accomplish it.