I just retuned a section of my wastegate DC after putting a cat delete on my car getting it so sit at an even 20 psi across the board and almost no drop off up to redline. Before I could set it up to 23psi max, but it always dropped down a few psi regardless of settings. Now that it holds steady (and it's getting pretty cold out) I'm starting to hit boost cut in second gear. Happened to me yesterday morning, and earlier tonight after resetting the ecu. I haven't touched the BDEL's at all so they're still sitting at stock, what level should I raise them up to? I'm kind of SOL at the moment on datalogging too, my laptop's battery won't last more than 5 minutes now so I need to get a power converter to log anything. But for the time being what would be a good setting and which table should I change it in? (I think it's table #2, but I'm not 100% positive) I did notice it hitting the cut around 4000rpm in 2nd gear, does that seem a little strange? I would think a higher gear with a higher load would trigger it.

 

Boost cut is controlled from the Boost limit table...so if you really are hitting boost cut raise the boost limit table at the specific rpm.

 

Yes post up a log of 2byte load + your boost limits table...

 

I don't remeber exactly, but I think the stock boost cut limit is only 240 or 250. Just raise that up to some higher value (i.e. 270-280, etc), and you should be fine.

 

Try to avoid hitting load induced fuel cut, it's tough on the engine. I hit it once and my car wouldn't log righ for weeks - kept getting like 300 counts of knock at -30 degrees timing for one sample each log. Eventually went away but I'm not sure the ecu fully recovered.

Anyhow, what caused it was I forgot to re-enter 319% in the all of the Boost Limit cells and 1000ms in the Boost Delay Timer one time when I defaulted my former flash to stock when I started tuning. What are yours set at?

 

You shouldnt set it to 319, cuz that just removes the boost cut safety completely.

 

Why would hitting boost cut have long term issues after resetting the ECU? I guess I've never hit it although I've exceeded the value during boost spikes.

 

Even with 2byte being logged? Maybe that table uses a different load value than some of the others..

 

So far I haven't had any real sucess getting the 2 byte load to work with my rom, every time I try it the tables get screwed up pretty bad. Probably because I screwed something up along the way, and I still haven't had the time to get a dc/ac power converter to datalog.
The boost limit is pretty low, starts out at 230 in the first 2 cells then lowers slightly to 225% and the BDEL tables sit at 159.4% until 3500rpms, then starts falling slowly. Timer delay still sits at 1 second (1000m/s). I don't want to raise the boost limit table to the max it can go just to keep it as a safeguard, so if I raise them to 250 or 260 I think I should be good for now.

 

Actually after looking at the map I think there's something wrong...the ID is 94170015 and the values look really screwed up. I just downloaded a slightly modified map with the ID 94170008 and all the values seem ok, maybe I'll try flashing it to my ecu to go from there. Other than swapping my immobilizer code over, does it matter that they are two different ID's?

 

Yeah 230 is pretty low. What you can do is look at the logs and see if you can see what the load was just when boost cut hit and set the limit maybe 5-10 above that.

Definitely don't do 319. Thats pretty much disabling the feature.

 

For me I would much rather hit high boost than boost cut, because it not only is boost cut, with a MBC it shuts down the injectors while under extreem load while under boost. Real bad

 

I can understand where you're coming from there, for me though I'd rather leave it as a safety feature. I don't have a MBC hooked up, so it's still controlled through the BCS and I would imagine if it shoots higher than what it's supposed to the BCS *should* compensate to bring it back down. I just happen to be hitting a higher load at the same pressure now, so that's all I really need to raise. It's a shame the safety feature wasn't some kind of spark cut instead of a fuel cut, that would be much safer although I don't think it would jive too well with emissions standards.