^awesome! I fixed a leaning out issue I had (like you described) by dropping my SD MAP VE table in around the 80-100 mark. I changed the 'disable egr timing increase' bit to 1 (to disable it) and this cruising studdering thing seemed to get worse. I guess I don't quite understand how adjusting the Asynch vs TPSDelta table helped this, any ideas or can you elaborate on what you were seeing before/after the change? I haven't touched mine yet.

Any chance anyone can comment on my setup above? Just looking for basic feedback.

 

Which SD ROM are you using?

 

Tephra v7, phenem patched, option 5 - 96531706.

 

I'm not really too sure why it was sputtering, only thing I could think of was in was leaning out too much as I moved the throttle slightly and the trims were trying to correct for it, but they just weren't getting it fast enough. According to my afr's I was ok, and everything always looked smooth on the logs except for the o2 feedback which was always jagged. My trims at that point were also around -10 for low and mid, but I just got them straightened out yesterday.

The change in MAP VE table I had noticed made a huge difference when I first started tuning it, and at one point I had a completely smooth run, but with 10.3 cruise afr's lol. I think that Asynch table will help you out a lot, give it a shot and see...I started out with adding 8 on to all the original values and added on extra from there to smooth it even more. It even smoothed out the cold startup and driving bits that used to break up horribly. I still get a very slight stumble once and a while when it's cold, but it used to be much worse even with the maf. Adjusting that table also smooths out the throttle transitions from open to close, as I was seeing a little bit of jerking like on the maf setup, and now that's disappeared as well.

 

Try the attached xml. It has several fixes to the xml that came with 96531706. Jack_of_Trades is also working on an updated 96531706 xml. Not sure when he plans to post it. I think he's pretty busy.

 

Friday update. Back up to 25psi! Its amazing how fast the car feels after its been down on power (or limped or whatever) for a few days. All of the little boost control mods v7 has to offer really make the car responsive and when its dialed in the car just rips! BBK is holding 25psi dead flat from 3800 out to 7700rpm (highest I've logged so far) with about 84% WGDC. Bryan@GST did note that he had to tweak WGDC a bit to bring boost inline with where it was before, and here's what I noticed: I needed a bit more WGDC down low during boost onset, and had to take a little bit out up top, boost was off by about 2-3%. I literally made two changes and logged a few pulls in a few different gears and its perfect again. I LOVE this ecu controlled boost setup once its dialed in!

More on topic, I have yet to touch my AFR or timing maps that shane@DB Performance made for me (and I hope to not have to, this tune has served me VERY well this summer ) My load up top is a bit high now, so I'm droping down the highest valve on the MAP VE table from 430 to 410 to see if I can slowly get load back to where it was before on the street. It's peaking in the 330's and tapering to ~300, before I was peaking at 280 and tapering to 250 or so. I'm also now using 1byte load vs 2byte load, so I'm focusing more on the timing values the car is running moreso than the actual load numbers I'm logging.

I had accidentally misread the EGR timing advance under cruise bit and disabled it (vs enabling it, the bit is backward, it reads 'disable EGR timing advance' 0 is enabled, 1 is disabled). I knew about this already and totally spaced it. Anyways its worth mentioning because my car drove like isht when it was cold and wanted to jerk when warmed up and cruising at low speed. As soon as I turned this back to 0 and put my EGR Timing Advance timing tables bumped up to where I had them before (bumped just slightly from stock, 6's and 8's) the car drove as it had before.

Still getting this ever so slight jerkyness when under low low load while cruising in the 2000-2700rpm range, Slo_crx1 I will try out the Asynch vs TPSDelta stuff you mentioned and see how it goes

I'm going to try these settings out, dial in my loads as mentioned above, and just bomb around for a few days and see how it goes! It's SO easy to focus on the laptop its getting to be time to just drive the car and see how it feels and just enjoy it. Once I'm happy, alky will be flipped back on and back up to 30psi!

Oh, does anyone know, can I just unplug my MAS? I'm toying with the idea of either gutting out an old MAS I have (w/ a destroyed honeycomb) or getting a 3" inlet perrin filter and just strapping it to the end of my buschur intake.

 

THANK YOU! I had noticed a few weird spots and had started to clean up what I had, but this works fantastic! Only goofy thing is that the line breaks are weird, not sure if that's a format issue or what (just opened it in notepad on windows).

Slo_crx1, would you mind sharing the Asynch_VS_TPSDELTA values you are using? I am taking your advice and just started by adding 10 across the board and I'll go from there.

 

You can unplug the MAF without issue.

I have gotten my car tuned fairly well now. Actually, overall, it's never driven better. No lift off jerk at all. No stalling. Nice and smooth.

I am getting the same cold start/driving issues mentioned and it's also where I'm trying to focue now. My car use to have cold driveability issues on the MAF too though and I got the issues resolved before with tweaking the cold start timing advance map, so I would say it's not too far off now.

One thing I have been playing with however has been cam timing adjustments as I wanted to get an idea of how much cam timing will affect the RPM VE table. It's fairly substiaintail. Below is a graph showing the approximate VE values I have to use on my car to match the AFR table to actual AFRs.

FP 280+ cams
Ported IX turbo/manifold
Ported head, stock valves
Home brew intake manifold porting (similar but inferior to Wilson V2.3)

The 0,0 and -4,0 values are the results from testing a ton of different settings and the 0,0 represented the best power under the curve where -4,0 made the best peak power. This data was collected using 4 pulls on each cam setting, same stretch of road, 30 minutes of total time for all 8 runs, 2 runs each direction to average out road conditions. This is the AVERAGE of all 4 runs for each setting.

 

double post

 

Probably the issue that I had with SD way back when I was testing it and mentioned in the 96530706+DMA+SD thread.

If you are experiencing the same thing, it is a jumpy IPW at a very specific map/RPM range. There is no 'fix' yet known. I think mrfred was looking at the code to see if he could see anything.


Eric

 

Yup that's almost exactly what I saw as well.

- Bryan

 

^The weird thing is, I haven't removed the MAF yet. Once I do maybe it will need further tweakage, but the fact that it needs less WGDC up top makes me HAPPY

 

I will look again for the logs, but as I recall it was 482 then 495 but I feel it was actually down with no tube since it was pulling all the air from right behind the radiator. With the fan out of the equation and no tune it went to 502? I also have all the dyno sheets as well. I will attempt to get everything all gathered up better this time.

aaron

 

Guess it was actually the end of May that we did this test not June/july. For the record this was on a 3582HTA. These two are the 2 that are closest as far as boost and timing. I will find the respective dyno graphs, though the first log is definitely the 480whp pull I have listed in the other thread. The second one maybe the first of the 4" intake tube pulls that night. If so it was high 400's. I wont guess until I find the .drf file though.

aaron

 

JohnBradley, any chance you could lend some advice on my comments in post #98? And maybe the rest of my posts about my setup, pretty please?