Question about single turbo vacuum diagrams

speedjunkie · 10-21-2008, 09:26 PM

Could be I suppose. But when we had disconnected the hose and ran off just the wastegate spring, it held at 10psi. So who the hell knows lol. I was thinking about getting the 15psi spring, or 14.2 rather.

speedjunkie · 10-22-2008, 08:16 PM

Well I think I may have figured out the problem. One of the settings in the boost controller allow it to only go up to 14psi, so I switched it to allow it to go above and according to the boost controller I got up to 15.5psi today. According to my boost gauge I only got about 13psi, but my tuner said my boost gauge was off sometimes. I'm not sure why it would be off, especially now since it's reading from near the map sensor.

I also switched the line on the side of the wastegate back to the T going to NC and the IC piping.

speedjunkie · 10-23-2008, 10:47 PM

Well, now I have a different problem...I'm OVERboosting now hahaha. All I did was mess with some of the boost controller settings, so I'm sure it's not the WG like I thought it was. And I think I might have the vacuum lines routed correctly now, but I can't be sure of that either.

On the setting to allow it to go to 2 bars, I got up to 18psi today, even though I had it set to cut off at 15psi. After I switched it to only get to 1 bars, I STILL got up to 17.5psi. This is getting ridiculous.

Any ideas NOW? lol

Kane · 10-24-2008, 12:05 AM

Is your BC set up in duty cycle? By raising the sampling rate and lowering the target boost; you shuold be able to get it back down.

speedjunkie · 10-24-2008, 10:13 AM

Yeah, on the first setting it's set to .7(?) for 10psi and at 25% duty, and the second setting is set to 1.05 for around 15psi and also set for 25% duty. I'm not real clear on how those work though. And you can also decrease duty per gear in each setting if I remember right. I know there is some way to adjust it if you're getting too much in this gear or that one, or if you're getting too little, but I'm trying to remember if it's duty that's being adjusted.

I'm going to try the other gears if I can get a long enough straightaway and see what kind of boost I reach. But what you're saying is like raise the duty from 25% to 45% or so? I don't really want to lower the target boost level but I guess I will if I have to, although I'm not sure that will change much haha.

Kane · 10-24-2008, 03:13 PM

Rule of thumb (though sometime it seems to be opposite)

1- If boost spikes and then falls off (below target boost); raise Duty Cycle and Target.
2- If boost spike above target and then falls back down to target; lower Duty Cycle.
3- To get the max boost the soonest - raise the start boost pressure (when it starts to open the wastegate) until you get a small spike. Then lower Duty Cycle.

If Boost spikes above taget; then falls below target - raise target and lower duty cycle. If it still won't hold target - then you are out breathing the turbo at that PSI.

speedjunkie · 10-24-2008, 04:01 PM

Before, it seemed like the WG was bleeding off early, not allowing me to get all the way to full boost. Now it seems like it won't fall off at all, it just seems to keep climbing, but it pauses around 12 to 15psi, then continues up to 17 or 18 as I keep my foot in it.

I'm not sure how to raise the start boost pressure. So I'm kinda between 2 and 3 right now, although it doesn't really fall off at all.

Kane · 10-24-2008, 06:45 PM

It doesn't falloff at all huh - may still have the WG signal lines messed up; can you try it with the BC set to zero across the board.

speedjunkie · 10-25-2008, 10:18 PM

Yep, doesn't fall off at all. Which lines are the signal lines, the one to the sensor you mean? Yeah I could shut it off completely and see what happens, but it would just go all the way to 30 or whatever if it was off wouldn't it? Or would it go off the wastegate spring?

10-24-2008, 12:05 AM	#19
Kane All about the O2 Join Date: Sep 2008 iTrader: (0) Posts: 295 Rep Power: 17	Is your BC set up in duty cycle? By raising the sampling rate and lowering the target boost; you shuold be able to get it back down. __________________ My 2007 Turbocharged RX8

10-24-2008, 03:13 PM	#21
Kane All about the O2 Join Date: Sep 2008 iTrader: (0) Posts: 295 Rep Power: 17	Rule of thumb (though sometime it seems to be opposite) 1- If boost spikes and then falls off (below target boost); raise Duty Cycle and Target. 2- If boost spike above target and then falls back down to target; lower Duty Cycle. 3- To get the max boost the soonest - raise the start boost pressure (when it starts to open the wastegate) until you get a small spike. Then lower Duty Cycle. If Boost spikes above taget; then falls below target - raise target and lower duty cycle. If it still won't hold target - then you are out breathing the turbo at that PSI. __________________ My 2007 Turbocharged RX8

10-24-2008, 06:45 PM	#23
Kane All about the O2 Join Date: Sep 2008 iTrader: (0) Posts: 295 Rep Power: 17	It doesn't falloff at all huh - may still have the WG signal lines messed up; can you try it with the BC set to zero across the board. __________________ My 2007 Turbocharged RX8

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10-21-2008, 09:26 PM	#16
speedjunkie RCC Loves Me Not You Join Date: Mar 2008 Location: Colorado Springs, CO iTrader: (1) Posts: 2,089 Rep Power: 19	Could be I suppose. But when we had disconnected the hose and ran off just the wastegate spring, it held at 10psi. So who the hell knows lol. I was thinking about getting the 15psi spring, or 14.2 rather.

10-22-2008, 08:16 PM	#17
speedjunkie RCC Loves Me Not You Join Date: Mar 2008 Location: Colorado Springs, CO iTrader: (1) Posts: 2,089 Rep Power: 19	Well I think I may have figured out the problem. One of the settings in the boost controller allow it to only go up to 14psi, so I switched it to allow it to go above and according to the boost controller I got up to 15.5psi today. According to my boost gauge I only got about 13psi, but my tuner said my boost gauge was off sometimes. I'm not sure why it would be off, especially now since it's reading from near the map sensor. I also switched the line on the side of the wastegate back to the T going to NC and the IC piping.

10-23-2008, 10:47 PM	#18
speedjunkie RCC Loves Me Not You Join Date: Mar 2008 Location: Colorado Springs, CO iTrader: (1) Posts: 2,089 Rep Power: 19	Well, now I have a different problem...I'm OVERboosting now hahaha. All I did was mess with some of the boost controller settings, so I'm sure it's not the WG like I thought it was. And I think I might have the vacuum lines routed correctly now, but I can't be sure of that either. On the setting to allow it to go to 2 bars, I got up to 18psi today, even though I had it set to cut off at 15psi. After I switched it to only get to 1 bars, I STILL got up to 17.5psi. This is getting ridiculous. Any ideas NOW? lol

10-24-2008, 10:13 AM	#20
speedjunkie RCC Loves Me Not You Join Date: Mar 2008 Location: Colorado Springs, CO iTrader: (1) Posts: 2,089 Rep Power: 19	Yeah, on the first setting it's set to .7(?) for 10psi and at 25% duty, and the second setting is set to 1.05 for around 15psi and also set for 25% duty. I'm not real clear on how those work though. And you can also decrease duty per gear in each setting if I remember right. I know there is some way to adjust it if you're getting too much in this gear or that one, or if you're getting too little, but I'm trying to remember if it's duty that's being adjusted. I'm going to try the other gears if I can get a long enough straightaway and see what kind of boost I reach. But what you're saying is like raise the duty from 25% to 45% or so? I don't really want to lower the target boost level but I guess I will if I have to, although I'm not sure that will change much haha.

10-24-2008, 04:01 PM	#22
speedjunkie RCC Loves Me Not You Join Date: Mar 2008 Location: Colorado Springs, CO iTrader: (1) Posts: 2,089 Rep Power: 19	Before, it seemed like the WG was bleeding off early, not allowing me to get all the way to full boost. Now it seems like it won't fall off at all, it just seems to keep climbing, but it pauses around 12 to 15psi, then continues up to 17 or 18 as I keep my foot in it. I'm not sure how to raise the start boost pressure. So I'm kinda between 2 and 3 right now, although it doesn't really fall off at all.

10-25-2008, 10:18 PM	#24
speedjunkie RCC Loves Me Not You Join Date: Mar 2008 Location: Colorado Springs, CO iTrader: (1) Posts: 2,089 Rep Power: 19	Yep, doesn't fall off at all. Which lines are the signal lines, the one to the sensor you mean? Yeah I could shut it off completely and see what happens, but it would just go all the way to 30 or whatever if it was off wouldn't it? Or would it go off the wastegate spring?