Boost fluctuation - Page 2

Brock31 · 11-04-2009, 04:05 PM

dumdum--
Was that TD04 map using the stock BCS?

quazimoto · 11-04-2009, 04:08 PM

...........double post

quazimoto · 11-04-2009, 04:08 PM

Quote:

Originally Posted by Brock31

So you were running 99% max WGDC in the low rpm range? Wouldn't that cause a crazy overboost situation?

Why? Look at where I'm using that at. It allows the GMBCS to act like a MBC by doing that. Better spool. "Crazy" overboost is generally a turbo dynamics problem.

quazimoto · 11-04-2009, 04:10 PM

Quote:

Originally Posted by Brock31

dumdum--
Was that TD04 map using the stock BCS?

http://forums.nasioc.com/forums/show...0&postcount=24

Brock31 · 11-05-2009, 09:11 AM

Quote:

Originally Posted by dumdum

Why? Look at where I'm using that at. It allows the GMBCS to act like a MBC by doing that. Better spool. "Crazy" overboost is generally a turbo dynamics problem.

That makes sense the more I think about it. I may try this format, not the exact same values, because its my understanding that the Grimmspeed BCS nees a bit less WGDC than the GM.

What would happen if I significantly lowed my TD tables to not swing so much? Maybe only give them a 1% Correction or something like that?

quazimoto · 11-05-2009, 11:49 AM

It(turbo dynamics) would just have to repeat the process more to hit target boost. Thats why you should try to set realistic boost targets. Especially in the lower ranges. My car was very responsive with that setup. Lightning fast spool up.

Brock31 · 11-05-2009, 08:09 PM

Quote:

Originally Posted by dumdum

It(turbo dynamics) would just have to repeat the process more to hit target boost. Thats why you should try to set realistic boost targets. Especially in the lower ranges. My car was very responsive with that setup. Lightning fast spool up.

I'm going to model my target boost, wgdc and TD after your map and see what happens. I'll post back with results.

quazimoto · 11-05-2009, 10:33 PM

Quote:

Originally Posted by Brock31

I'm going to model my target boost, wgdc and TD after your map and see what happens. I'll post back with results.

Just remember you have to also take into account the "wategate duty compensation per IAT"

Brock31 · 11-05-2009, 10:57 PM

So far so good.
I'll post up some logs tomorrow. As of now the boost seems stable. I still need a bit of fine tuning, but it is a very good starting point. I logged 20.75 in one spot which is a bit higher than I'm comfortable with, but I can tune that out. I was holding 19 and tapering to about 13 at redline. Very minor occilation. (very minor) I also got to 13 psi by 3000 which is about 400 sooner than before.

Brock31 · 11-06-2009, 10:21 AM

2nd gear log pulled last night. One small area of high boost, but I wouldn't consider it a bad spike. I think it could hold a bit more towards redline. As of now, dumdum's boost map is looking good to me.

Brock31 · 11-06-2009, 03:24 PM

Bump...

scoobystas · 11-06-2009, 05:45 PM

i'm having a similar issue in my map where boost fluctuates after 5.5k. let us know when you figure it out.

quazimoto · 11-06-2009, 07:27 PM

Have you tried removing some preload from the wastegate arm? Try a half a turn out at a time. Also don't forget about the IAT wastegate compensation map.

scoobystas · 11-06-2009, 10:11 PM

dumdum,

should the wgdc IAT comp be zeroed out after 68F to 230F

Brock31 · 11-06-2009, 10:48 PM

Quote:

Originally Posted by dumdum

Have you tried removing some preload from the wastegate arm? Try a half a turn out at a time. Also don't forget about the IAT wastegate compensation map.

Not yet. Thats my next move. I just really hate removing the stupid heat sheild cause its such a pita to get back on.
My IAT map is basically stock. Would you recommend increasing the WG correction % ?
Right now it feels pretty smooth. I just want to smooth it out a bit more and decrease the minor spike I'm experiencing.

quazimoto · 11-07-2009, 11:16 AM

Quote:

Originally Posted by scoobystas

dumdum,

should the wgdc IAT comp be zeroed out after 68F to 230F

It depends on the mods you have. In my opinion, a car with meth injection,high octane/e85 and a huge FMIC probably can add WGDC in that table to keep boost from falling in hotter weather. I run 93 octane with a decent TMIC and no meth/water inection or TMIC cooler. So in hot weather I just let the boost naturally drop a little by leaving the compensation be 0 from 68°F on up.

Quote:

Originally Posted by Brock31

Would you recommend increasing the WG correction % ?
Right now it feels pretty smooth. I just want to smooth it out a bit more and decrease the minor spike I'm experiencing.

If you change to a 3port solenoid ALL boost maps have to change including WGDC per IAT. This is what I was using:

Also remember,just because this map (all the tables) on my car doesn't mean it will just automaticly work on yours. I ran a P&Ped Tdo4 with a BPM TMIC,TGV deletes,EL header,catted DP and some other goodies with that map. You might need to go back and retweak the Turbo Dynamic tables alittle or the Max wastegate duty table as well.

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11-04-2009, 04:05 PM	#26
Brock31 Scooby Specialist Member#: 128115 Join Date: Oct 2006 Chapter/Region: South East Location: Wilmington, NC Vehicle: 2004 4EAT Wagon PSM enginuity is cool	dumdum-- Was that TD04 map using the stock BCS?

11-04-2009, 04:08 PM	#27
quazimoto NASIOC Supporter Member#: 70395 Join Date: Sep 2004 Chapter/Region: MAIC Location: Midland,Va Vehicle: 02 wrx whitey	...........double post

11-05-2009, 11:49 AM	#31
quazimoto NASIOC Supporter Member#: 70395 Join Date: Sep 2004 Chapter/Region: MAIC Location: Midland,Va Vehicle: 02 wrx whitey	It(turbo dynamics) would just have to repeat the process more to hit target boost. Thats why you should try to set realistic boost targets. Especially in the lower ranges. My car was very responsive with that setup. Lightning fast spool up.

11-05-2009, 10:57 PM	#34
Brock31 Scooby Specialist Member#: 128115 Join Date: Oct 2006 Chapter/Region: South East Location: Wilmington, NC Vehicle: 2004 4EAT Wagon PSM enginuity is cool	So far so good. I'll post up some logs tomorrow. As of now the boost seems stable. I still need a bit of fine tuning, but it is a very good starting point. I logged 20.75 in one spot which is a bit higher than I'm comfortable with, but I can tune that out. I was holding 19 and tapering to about 13 at redline. Very minor occilation. (very minor) I also got to 13 psi by 3000 which is about 400 sooner than before.

11-06-2009, 10:21 AM	#35
Brock31 Scooby Specialist Member#: 128115 Join Date: Oct 2006 Chapter/Region: South East Location: Wilmington, NC Vehicle: 2004 4EAT Wagon PSM enginuity is cool	2nd gear log pulled last night. One small area of high boost, but I wouldn't consider it a bad spike. I think it could hold a bit more towards redline. As of now, dumdum's boost map is looking good to me.

11-06-2009, 03:24 PM	#36
Brock31 Scooby Specialist Member#: 128115 Join Date: Oct 2006 Chapter/Region: South East Location: Wilmington, NC Vehicle: 2004 4EAT Wagon PSM enginuity is cool	Bump...

11-06-2009, 05:45 PM	#37
scoobystas Scooby Specialist Member#: 26568 Join Date: Oct 2002 Chapter/Region: NESIC Location: Brighton, Mass Vehicle: 2003 Yellow Bugeye Version 8-Vf37	i'm having a similar issue in my map where boost fluctuates after 5.5k. let us know when you figure it out.

11-06-2009, 07:27 PM	#38
quazimoto NASIOC Supporter Member#: 70395 Join Date: Sep 2004 Chapter/Region: MAIC Location: Midland,Va Vehicle: 02 wrx whitey	Have you tried removing some preload from the wastegate arm? Try a half a turn out at a time. Also don't forget about the IAT wastegate compensation map.

11-06-2009, 10:11 PM	#39
scoobystas Scooby Specialist Member#: 26568 Join Date: Oct 2002 Chapter/Region: NESIC Location: Brighton, Mass Vehicle: 2003 Yellow Bugeye Version 8-Vf37	dumdum, should the wgdc IAT comp be zeroed out after 68F to 230F