Great Success!!! (Borat Voice) I knew it had to be something simple; the car fired right up once I added back the stock values for the load limit/IPW limit. Now I can get down to tuning this beast. Thanks for your help Eric

 

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I've finally wrapped my mind around how to tune w/ SD and can report that the car is running like a champ. Start Up w/ the 1450cc's is on the first crank, Idle STFT/LTFT are hovering around + or - 1, partial throttle cruises like MAF setup, WOT fueling is spot on w/ my AFR map. I've noticed the car is less "bucky" when coming off the throttle as well. I'm still going to work on fine tuning the setup, but for now I'm about 90% complete. The suction sound from the new Amsoil filter is pretty wicked and I can now do proper ricer salutes w/ my vented BOV

Question: Ever since converting my IDC's only display "0" in my EvoScan logs; any idea what I need to change to get that back logging correctly?

 

Make sure that RPM and IPW are both selected before IDC%. I had the same problem and it was just because I had messed with Evoscan settings and it was trying to read IPW before the row had populated.

 

for those using the omni 4 bar can you post the values. the boost logging patch is set up for the jdm 9 map and i cant seem to find the values for the omni.

 

If you are referring to the XML changes you can find that in the second post of this thread. If you are referring to changes for logging purposes you can find that in a post by JohnBradley titled "Omni 4-Bar". I'm not sure what values you are looking for; MAP/Load Table settings?

 

Found something else that could be affecting my tune right now and giving me some inconsistent oscillations at light cruise; I'm currently running an APS BOV vented to the atmosphere. I never paid any attention to it before, but when the car is idling under vacuum the brass valve inside the BOV is partially open venting air. I'm assuming the same is true when cruising under vacuum (probably venting even more). This would explain why my WOT throttle runs under boost are really consistent (valve pushed closed), but the cruising AFR are pretty jumpy.

Question: Is it possible to keep the APS BOV closed under vacuum situations or does it require me to source a Tial? From reading on APS' website it appears the primary port is supposed to remain shut unless throttle plate is reduced or shut.

Edit: I think I just answered my own question; if I want to utilize this BOV I'll probably have to run a different spring to keep the valve closed under vacuum. I wonder if a Tial spring would fit?

 

Why would the BOV leaking at part throttle cause AFRs to be erratic with a speed density set-up? Are you concluding that the leaking is erratic so that the MAP readings are erratic?

 

Creamo3 - Are you seeing the issue that I am seeing in the 96530706 thread? Or are you seeing something different?

My issue (you can see in the serveral screenshots I posted) is a jumpy/jagged IPW just in the 1800-2500/65-85kpa range.

 

That's what I'm thinking; also the tuning that I've done for part throttle and idle is based around the BOV venting air that should be read by the MAP sensor. I was doing some reading on Tial's site and they have you specify the type of spring to install in their 50mm BOV based on your max vacuum to keep the valve closed under vacuum situations.

 

It sounds similar, but I attributed it to my VE table not being 100% spot on. I also had a P0172 code get thrown during cruise due to a rich condition which tells me the VE table for that area is off. I was going to force open loop to see if I could nail some of this down, but I'm thinking I need to solve the issue of the BOV venting while idling/cruise.

What do you have your bins set to for your MAP/Load table for the 4-bar?

 

Well, I had them set and my STFT and LTFTs were spot on, but I'm just about to change them again. I had my map row at 10, 40, 50, 70, 100, 170, 200, 408. But I am changing it to give me more resolution in my trouble area. So, I am changing it to 10 40, 50, 60, 70, 80, 120, 408. The values for load range from about 70% on the low end up to 100% at the 100-120 area and 100% at 408. I have my RPM table at 100% in the mid range, tapering down on both ends.

Once I get these new settings dialed in, I will post it up. I was also thinking that my BOV (Synchronic) may be the issue in that area, but haven't adjusted it yet to see. My logs didn't seem to point to anything as the issue.

 

Put some work in today: I adjusted the BOV to not leak at idle/vacuum. Adjusted my fuel trims and then worked on my VE tables and adjusted the Asynch v TPS Delta & Accel v RPM tables. Car is running much better and more consistent and alleviated the P0172 code I was getting. This tune is definitely going to be a work in progress and the crux of my focus is going to be on perfecting the low RPM cruise and throttle transitions. The car feels snappier after adjusting the Asynch tables. The oscillations are intermittent and happen around 3-3.5k rpms during steady state cruise; the adjustments I have made seem to have helped though.

 

My issue happens from 65-85 kpa/1800-2400RPM. Everything else is very smooth and works great. I've narrowed down what the cause is for me...which is the jumpy IPW. I'm still trying to figure out the root cause is though. I just posted in the other thread, where it seems to be correlated to Maf Hz, so I have a question about how the Maf Hz is calculated with the SD patch.

 

I'm running 96530706 SD with a GM 3-bar; previously running 96530006 tephra 510 with the MAS. I seem to have my VE tuned fairly accurate. My car kind of stutters sometimes when cruising in vacuum. To me it's like it would be if it were really insanely lean, but it's not -- at the moment I'm running richer than I was with the MAS -- 15.5:1 (I was running very smooth at over 17:1 before).

Also, if I step it down quickly, it shows lean for a split second, which makes my car really bad to take off with when the engine isn't warmed up. Like a really quick change in intake pressure messes it up for a split second-- pressure decrease = rich, pressure increase = lean.