You can change RPM points however you like and for whatever you are trying to do. I usually changed the 3500-5000 points since it seems to give a bit more control in that 'sensitive' area of boost.

 

Yeah try lowering and see if it will kick in then. It definitely does work I have gotten to spike on average about 6/7 load values less already. Did you leave the stock values for the negative values?

I was going to try setting offset 5 lower and then the over shoot would probably be less as well. But in my runs so far 3 times it brings the load down to about 2 values above where its supposed to be and then other 1 time it brought it down 1 value below where its supposed to be so I think if I go 5 lower then sometimes it will end up running less load then I want it to.

 

Bryan,

Care to share with us a WGDC table with 21 psi peak and holding 20 psi to redline on a TBE Evo 9 using a #65 pill instead of the GM solenoid ?

Thanks

 

Yeah that's just it, the negative values are still there. Logged load (2-byte) is greater than BDEL + offset from 3000 RPM to redline (by as much as 15%) and it still doesn't reduce WGDC. When I get my car mobile again, I'll try reducing the offset dramatically but at this point I don't expect it to change anything.

 

Sure, here are two examples:

Evo 9
Mods:
Catback (stock dp and cat)
drop-in filter



Evo 9
Mods:
TBE with cat
drop-in filter
LICP
FP

 

very nice.

and no worries about thread jacking. The point of this thread, for me [cause it is all about me right], is to help with issues pertaining to tuning boost. Really the discussions about TBEC seem a bit thin as far as I have found as it pertains to using it to really control boost in more real world scenarios vs. the standard 3rd gear roll-on from 2500.

My GM 3-port is on order and so I'm done testing until then but in the meantime I'm all about hearing everyone else's experiences on the topic.

 

I'll toss in my 2c. I wasn't able to get boost overshoot under control until after I disabled lean spool. Prior to disabling lean spool, I would routinely shoot past the load/boost target almost anytime I nailed the throttle in the peak spool region (say 3500-5500 rpm) when I was in 4th/5th/6th gear. After I disabled lean spool, I could more comfortably push the target load to higher values knowing that the there would be no overshoot.

You'll never get the factory boost system to act like an EBC that can hold the WG shut until the last millisecond during spool-up. However, there are ways to help aid spool-up. Leaner afrs will cause faster spool. More advance usually helps with spool. Tinkering with the MIVEC tables can help too. A LICP seems to help in my experience.

The ultimate in control boost control would be the top-of-the-line Greddy (or whatever) allows setting boost targets across the rpm range and can hold the WG shut until just before reaching the target boost. Those are like $500-$600 though. The next best alternative seems to be a toss-up between a lessor EBC and the factor boost control system. The lessor EBCs can hold the WG shut until just below target boost but do not have rpm-based boost settings. The factory boost control system effectively allows controlling the boost target across the rpm range, but does not have the ability to modulate the WG as a function of boost level.

 

FYI, I also have lean spool disabled.

 

hummmm all very interesting. Let me ask you this if I may, would you say that it is harder to get decent control, like you have it show in "log WGDC in EvoScan" if the range you had to work with in BWGDC looked like this:

500 100
2000 100
3555 100
3602 89
3750 89
4000 90
4250 97
4500 98
4750 96
5000 96
5250 96
5500 95
5750 94
6000 96
6500 97
7000 99

I get great spike control rolling on from 2500 in any gear. When rolling on from 3500-4000 my problem isn't so much spike as it is just running higher boost/load than requested. All the while it is holding WGDC at 100% until about 5600 where I FINALLY see WGDC drop by like 10% and load drops as well. But during that whole time 2-byte load was around 225-230 and my target load was around 215. You can see some of the logs here https://www.evolutionm.net/forums/sh...08&postcount=9 if you hadn't read the entire thread to put it in perspective.

The question is why is it holding at 100% for so long despite my BWGDC, TBEC and Target load tables? I think it might be because I'm playing so close to 100% as it is and that I need a smaller pill (I have a #59 right now) or better, the GM solenoid that I just recieved my tracking number on woohoo.

regardless it sounds like I just have to shut-off lean spool. I know a lot of folks are doing it to control their AFR better but without a WBO2 yet in my arsenal (needed to buy new brake first) I haven't done much tweaking with the fuel tables. A little mind you , but not much. Besides I liked to idea of helping spool whenever possible but I'm getting good enough spool to cause spike ... well ok I guess.

I wish I understood the workings of the TBEC better and how the ECU is really working it.

 

That is a narrow WGDC range, but your setup is different than mine. I think that you may have to do some tinkering with the settings to figure what's happening with your car. I suggest lowering your target load bit by bit until you see the ECU start adjusting the WGDC. Maybe just try lowering it in a specific RPM range.

 

yeah that is what I thought too; but that is what I needed to get decent boost. I started at like 50% and that was way too low.

I'll try what you suggest as I start retuning with the 3-port. hopfeully, since I know the range I'll use for that will be lower, I'll have some more luck. that and turning off lean spool.

 

this seems to work for me just fine without rescaling stock. (21psi peak 20 redline)
turbo error corection wastegate duty cycle (90.5%) all around
5
5
5
5
4.5
4
3.5
2
0
-1.5
-3.5
-5
-6
-13
-13
-13
-13

 

I think the most important thing here is to choose the correct size pill for the boost target that you want to hit. Using the #65 pill I was able to achieve ~21.5 psi and hold it all the way to 7000 rpm. I was also able to be very very close to the BDEL target w/o even touching the TBEC tables. IMO, you do NOT have to zero these tables to get close to your BDEL target.

The screen shot below shows the actual boost and Load (BDEL+BCLO) as well as the WGDC and the BDEL target. BCLO is set @ 100. I took me three logging sessions to get this right.

This was done on 91 pisstane with 1 count of isolated knock.