Ah, I missed the audible knock part before. Well, it's good that the IATs are normal anyway.

I just reread the first post and saw this: "If I open the throttle fast enough to jump into boost past 3lbs, the meth kicks on and I have 0 knock. At this point, I think that it is a fuel delivery problem."

That definitely sounds like fuel. When you said you could get 10:1 on the WBO2s is that with the meth running?

Your 2bar OS should match your OS number in your stock tune (unless they've changed that system, but I don't see how they could, really). Are you sure you built the corresponding 2bar?

 

Just for fun... Run a compression test.

 

I turned the meth off a while ago to eliminate a variable. I can get all the fuel I ask for, I have been bogging in areas. The OS I loaded is the only 2005 custom OS (0512) available, it is the correct one that lines up with my stock OS. They show another 2005 OS (0513) in the tutorial but I don't have it in my folder. I updated to version 7.4.2 and still have just one 2005 custom OS.

I'll run a compression test next time I have the plugs out.

I installed a Hitachi MAF today thinking that it would solve my problems going back to the stock 1bar OS. I still have knock around the same area, it knocks less than the SD tune and I am running 20* more timing in the closed loop tune. The truck drives like normal and feels much better due to the normal timing. The fueling with the MAF is unacceptable. To get 11.5:1 at 9lbs through the MAF I am commanding 4:1 on my PE table. It runs fine at WOT under full boost, but partial throttle burries the WB and bogs out. I tried a little less on the PE, but it leans out up top. I might be able to make a compromise using the Alky and a leaner PE, but this is the whole reason I bought the 2bar MAF and commercial EFI live. I NEED a 2bar OS. I don't know what to do.

 

I found a potential problem, I think. I logged the MAP output in the scan tool with the key on truck off and had 100kPa. I tracked the cell in the tuning tool on the VE, it showed me 400rpm (not running) and 30kPa. I started the truck, at idle the scan tool shows me 47kPa, the tuning tool tracks the RPM column up and down but is stuck on 15kPa row. If I stab the throttle and get up to 100kPa on the scan tool (and mechanical boost gauge to verify) I see the tracked cell sweep from 15 to 30kPa on the VE.

The tracked cell sits on 30kPa in the tuning tool with the key on truck off, while the scan tool shows 100kPa. I plugged the stock 1bar MAP back in and just set it on top of the manifold. I scaled the stock settings back in and turned the key on truck off. The scan tool showed me 99kPa and the tuning tool tracked the cell at 30kPa. I think there is a disconnect between what the PCM sees from the MAP, and what I see on the scan tool. Could this explain my problem, and how do I correct it?

Thanks
Henry

Sorry for the double post, this thread could be merged with my operating system thread.

 

That's probable not you problem, you scanner is just set to SAE not metric for the MAP. Click on your pid page in the scanner and then right click on the MAP pid. Set it to metric (kPa) and it will track right in the tune tool.

I still, REALLY think you need to run a comp test on it.

 

I set the pid to metric and it did track the correct cell. At least I can see which cells I am running on now, lol.

I can borrow a compression test gauge. Would I be looking for low cylinders?
Thanks KB

 

Yes, tune problems don't just generally pop up out of no where after making a 0-60 run. That's generally a sign the that some thing broke . A broken piston can make a knocking noise at certain rpms and load conditions, but be quite the rest of the time.

 

I made some huge progress today. I have eliminated 90% of my knock problems. DCJustin gave me a crash course on EFI tuning, and explained that sometimes low timing can actually cause knock. Even in today's 95* heat I was able to add 6* or more in places to the stock timing table, which is already higher than what I was running while knocking. The increased timing eliminated my knock, and added power and drivability. Talk about having your cake and eating it too! I am very happy to solve this problem. I also perfected my injector flow rate table. Thanks to DCJustin and everyone with advise on this thread, I owe all you guys one!

 

Justin is one smart guy. Glad you were able to get the darn thing headed in a positive direction!
So no more issue? Wow, I know you must be greatly relieved. I don't have your kind of patience.

 

Thanks Bill, if I didn't have you guys to bounce ideas off of I would probably not have been as patient. Tuning on the street takes some time for me to find the trouble areas and correct them. But within 30 minutes I got rid of 90% of the knock that I had. The only knock I get now might be a blip on agressive throttle transitions, nothing like before. It will take time for me to refine the tune, but it gets better with every flash.