R56 DP back exhaust performance issues.. Boost surging/bouncing @ WOT
#26
11-11-2014, 06:55 AM
A leaking diverter valve will cause a boost leak not a boost surge. My car is an auto with the original diverter boosting to just shy of 22psi no problem. I know that system cost a lot of mulla and I'd be pissed too if it was causing problems. Is there an iPE dealer nearby that can take a look and rule out the exhaust causing the problem.
Thumsup.
#27
11-12-2014, 07:56 AM
Join Date: Jan 2014
Location: Ashburn, VA
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I think that iPE is passing the buck. While there might be some truth in what they say regarding the diverter valve you are experiencing the surge at WOT where the diverter valve does NOT factor in.
Surge happens when boost pressure is high but air flow is low. You're trying to cram more air than the engine can take. So installing a higher flowing cat back exhaust should definitely NOT cause surge.
You need to figure out what is causing the restriction to air flow. The only thing that changed was the iPE exhaust.
I keep going back to the exhaust valve and the vacuum lines. If for whatever reason the exhaust valve is cycling (may be due to a weird vacuum signal) this could cause a restriction and the surge. Is there a way that you can manually lock the exhaust valve open without hooking up the vacuum lines and try it like that?
Regarding the lower boost pressure with the exhaust in "quiet" mode. This itself should not cause lower boost pressure (I could see it causing surge). It seems that the vacuum lines are doing something to lower the boost pressure. It would be nice to know exactly how this exhaust works.
Surge happens when boost pressure is high but air flow is low. You're trying to cram more air than the engine can take. So installing a higher flowing cat back exhaust should definitely NOT cause surge.
You need to figure out what is causing the restriction to air flow. The only thing that changed was the iPE exhaust.
I keep going back to the exhaust valve and the vacuum lines. If for whatever reason the exhaust valve is cycling (may be due to a weird vacuum signal) this could cause a restriction and the surge. Is there a way that you can manually lock the exhaust valve open without hooking up the vacuum lines and try it like that?
Regarding the lower boost pressure with the exhaust in "quiet" mode. This itself should not cause lower boost pressure (I could see it causing surge). It seems that the vacuum lines are doing something to lower the boost pressure. It would be nice to know exactly how this exhaust works.
The weird thing is that I have not uninstalled the vacuum lines and ran all my tests that way. I just plugged the end that connects to the nipple on the valve on the exhaust. So I am not convinced it is the vacuum line, although it could have to do with the valve on the iPE exhaust.
I am going to reinstall the iPE exhaust later this week. I will not connect the valve to the vacuum line but instead leave the vacuum line plugged. By default, the exhaust valve is open so this will be a good test to see if the problem occurs only when the valve is connected to the vacuum line. If I don't have any surge with the vacuum line plugged but I do with the valve connected, it will help identify the problem. I am really hoping that the Evolve DP and the iPE work well and I don't have any issues with either the line connected or plugged.
A leaking diverter valve will cause a boost leak not a boost surge. My car is an auto with the original diverter boosting to just shy of 22psi no problem.
I know that system cost a lot of mulla and I'd be pissed too if it was causing problems.
Is there an iPE dealer nearby that can take a look and rule out the exhaust causing the problem.
I know that system cost a lot of mulla and I'd be pissed too if it was causing problems.
Is there an iPE dealer nearby that can take a look and rule out the exhaust causing the problem.
Here is an updated summary:
1a.) Stock tune, stock JCW DP, stock JCW exhaust, with the iPE vacuum lines installed but plugged, in "open" mode - runs great
1b.) Stock tune, stock JCW DP, stock JCW exhaust, with the iPE vacuum lines installed but plugged, in "closed" mode - runs great
2a.) Stock tune, stock JCW DP, iPE exhaust, with the iPE vacuum lines installed and connected, in "open" mode - compressor surge
2b.) Stock tune, stock JCW DP, iPE exhaust, with the iPE vacuum lines installed and connected, in "closed" mode - runs fine, low boost
3a.) Stage 2 tune, stock JCW DP, stock JCW exhaust, with the iPE vacuum lines installed but plugged, in "open" mode - runs great
3b.) Stage 2 tune, stock JCW DP, stock JCW exhaust, with the iPE vacuum lines installed but plugged, in "closed" mode - runs great
4a.) Stage 2 tune, stock JCW DP, iPE exhaust exhaust, with the iPE vacuum lines installed and connected, in "open" mode - compressor surge
4b.) Stage 2 tune, stock JCW DP, iPE exhaust exhaust, with the iPE vacuum lines installed and connected, in "closed" mode - runs fine, low boost
5a.) Stage 3 tune, Evolve DP, stock JCW exhaust, with the iPE vacuum lines installed but plugged, in "open" mode - runs great
5b.) Stage 3 tune, Evolve DP, stock JCW exhaust, with the iPE vacuum lines installed but plugged, in "closed" mode - runs great
6a.) Stage 3 tune, Evolve DP, iPE exhaust, with the iPE vacuum lines installed, plugged and not connected to the valve, in "open" mode - ???
6b.) Stage 3 tune, Evolve DP, iPE exhaust, with the iPE vacuum lines installed, plugged and not connected to the valve, in "closed" mode - ???
7a.) Stage 3 tune, Evolve DP, iPE exhaust, with the iPE vacuum lines installed and connected, in "open" mode - ???
7b.) Stage 3 tune, Evolve DP, iPE exhaust, with the iPE vacuum lines installed and connected, in "closed" mode - ???
Last edited by igzekyativ; 11-12-2014 at 08:07 AM.
#28
11-20-2014, 02:17 PM
Join Date: Jan 2014
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So I've been running 7a and 7b below (the iPE exhaust with the exhaust valve connected and the Evolve high flow catted downpipe) for a day and half now. The compressor surge has not appeared. Most have been something with the stock downpipe and the iPE exhaust that was causing an issue. I'll follow up in a week and let you know if the compressor surge has reappeared.
Here is the updated summary of testing:
1a.) Stock tune, stock JCW DP, stock JCW exhaust, with the iPE vacuum lines installed but plugged, in "open" mode - runs great
1b.) Stock tune, stock JCW DP, stock JCW exhaust, with the iPE vacuum lines installed but plugged, in "closed" mode - runs great
2a.) Stock tune, stock JCW DP, iPE exhaust, with the iPE vacuum lines installed and connected, in "open" mode - compressor surge
2b.) Stock tune, stock JCW DP, iPE exhaust, with the iPE vacuum lines installed and connected, in "closed" mode - runs fine, low boost
3a.) Stage 2 tune, stock JCW DP, stock JCW exhaust, with the iPE vacuum lines installed but plugged, in "open" mode - runs great
3b.) Stage 2 tune, stock JCW DP, stock JCW exhaust, with the iPE vacuum lines installed but plugged, in "closed" mode - runs great
4a.) Stage 2 tune, stock JCW DP, iPE exhaust exhaust, with the iPE vacuum lines installed and connected, in "open" mode - compressor surge
4b.) Stage 2 tune, stock JCW DP, iPE exhaust exhaust, with the iPE vacuum lines installed and connected, in "closed" mode - runs fine, low boost
5a.) Stage 3 tune, Evolve DP, stock JCW exhaust, with the iPE vacuum lines installed but plugged, in "open" mode - runs great
5b.) Stage 3 tune, Evolve DP, stock JCW exhaust, with the iPE vacuum lines installed but plugged, in "closed" mode - runs great
6a.) Stage 3 tune, Evolve DP, iPE exhaust, with the iPE vacuum lines installed, plugged and not connected to the valve, in "open" mode - ???
6b.) Stage 3 tune, Evolve DP, iPE exhaust, with the iPE vacuum lines installed, plugged and not connected to the valve, in "closed" mode - ???
7a.) Stage 3 tune, Evolve DP, iPE exhaust, with the iPE vacuum lines installed and connected, in "open" mode - so far running fine, lower boost than 5a
7b.) Stage 3 tune, Evolve DP, iPE exhaust, with the iPE vacuum lines installed and connected, in "closed" mode - so far running fine, higher boost than 4b and 2b
Here is the updated summary of testing:
1a.) Stock tune, stock JCW DP, stock JCW exhaust, with the iPE vacuum lines installed but plugged, in "open" mode - runs great
1b.) Stock tune, stock JCW DP, stock JCW exhaust, with the iPE vacuum lines installed but plugged, in "closed" mode - runs great
2a.) Stock tune, stock JCW DP, iPE exhaust, with the iPE vacuum lines installed and connected, in "open" mode - compressor surge
2b.) Stock tune, stock JCW DP, iPE exhaust, with the iPE vacuum lines installed and connected, in "closed" mode - runs fine, low boost
3a.) Stage 2 tune, stock JCW DP, stock JCW exhaust, with the iPE vacuum lines installed but plugged, in "open" mode - runs great
3b.) Stage 2 tune, stock JCW DP, stock JCW exhaust, with the iPE vacuum lines installed but plugged, in "closed" mode - runs great
4a.) Stage 2 tune, stock JCW DP, iPE exhaust exhaust, with the iPE vacuum lines installed and connected, in "open" mode - compressor surge
4b.) Stage 2 tune, stock JCW DP, iPE exhaust exhaust, with the iPE vacuum lines installed and connected, in "closed" mode - runs fine, low boost
5a.) Stage 3 tune, Evolve DP, stock JCW exhaust, with the iPE vacuum lines installed but plugged, in "open" mode - runs great
5b.) Stage 3 tune, Evolve DP, stock JCW exhaust, with the iPE vacuum lines installed but plugged, in "closed" mode - runs great
6a.) Stage 3 tune, Evolve DP, iPE exhaust, with the iPE vacuum lines installed, plugged and not connected to the valve, in "open" mode - ???
6b.) Stage 3 tune, Evolve DP, iPE exhaust, with the iPE vacuum lines installed, plugged and not connected to the valve, in "closed" mode - ???
7a.) Stage 3 tune, Evolve DP, iPE exhaust, with the iPE vacuum lines installed and connected, in "open" mode - so far running fine, lower boost than 5a
7b.) Stage 3 tune, Evolve DP, iPE exhaust, with the iPE vacuum lines installed and connected, in "closed" mode - so far running fine, higher boost than 4b and 2b
#30
02-10-2023, 01:35 AM
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