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turboat
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« on: March 09, 2014, 07:01:07 AM »
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What are peoples opinions on keeping the N249, but deleting the SAI pipework? Im missing the SAI pump and the pipework looks like a nasty mess, but the N249 seems to serve a useful purpose and there are a fair few comments on here saying that their car drove worse after deleting the N249.
This is for an AUQ 1.8T from a 2001 Leon.
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userpike
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« Reply #1 on: March 09, 2014, 12:22:23 PM »
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let the n249 do its magic.
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fknbrkn
Hero Member
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mk4 1.8T AUM
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« Reply #2 on: March 09, 2014, 01:25:33 PM »
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+1
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turboat
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« Reply #3 on: March 10, 2014, 07:24:11 AM »
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Cheers guys  Can I delete the SAI and leave the n249 in place? Happy to make up pipework as necessary. I was planning on doing/getting a SAI delete in the ECU, which I'll upload just as soon as I can get the laptop talking to the ecu. |
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fknbrkn
Hero Member
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mk4 1.8T AUM
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« Reply #4 on: March 10, 2014, 04:07:07 PM »
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yes
btw you can use the plastic bottle cap with some kind of seal to close hole in air filter box
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userpike
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« Reply #5 on: March 10, 2014, 04:33:22 PM »
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unless parts are needing to be replaced and cost is an issue, why delete the sai?
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turboat
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« Reply #6 on: March 11, 2014, 07:29:36 AM »
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unless parts are needing to be replaced and cost is an issue, why delete the sai?
I'm missing a fair bit of the pipework and the SAI pump, so see it as an opportunity to remove pipework that may spring a leak. |
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MadCow
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« Reply #7 on: March 14, 2014, 09:48:56 AM »
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yes
btw you can use the plastic bottle cap with some kind of seal to close hole in air filter box
Go to a parts store and buy an expanding plug, google it for pictures. |
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diagnosticator
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« Reply #8 on: September 11, 2014, 11:03:41 PM »
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SAI and the N249 solenoid valve are functionally unrelated . Maybe you are thinking of the N112 solenoid valve used to switch vacuum to open the combination valve that controls the air flow from the SAI pump into the exhaust ports? The N249 switches either manifold vacuum/boost pressure or vacuum pressure from the vacuum storage reservoir in the case where the ECU wants to open the DV if there is boost pressure in the intake or during certain low load cruise modes where opening the DV will reduce pumping and throttling losses.
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nyet
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« Reply #9 on: September 11, 2014, 11:08:20 PM »
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SAI and the N249 solenoid valve are functionally unrelated . Maybe you are thinking of the N112 solenoid valve used to switch vacuum to open the combination valve that controls the air flow from the SAI pump into the exhaust ports? The N249 switches either manifold vacuum/boost pressure or vacuum pressure from the vacuum storage reservoir in the case where the ECU wants to open the DV if there is boost pressure in the intake or during certain low load cruise modes where opening the DV will reduce pumping and throttling losses.
Correct. The N249 has nothing to do with SAI. N249: Diverter valves N112: SAI |
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ME7.1 tuning guideECUx PlotME7Sum checksumTrim heatmap toolPlease do not ask me for tunes. I'm here to help people make their own. Do not PM me technical questions! Please, ask all questions on the forums! Doing so will ensure the next person with the same issue gets the opportunity to learn from your ex
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turboat
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« Reply #10 on: September 12, 2014, 02:07:41 AM »
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Got this one done now, sai is long gone. Wierd thing is most of the howtos on doing an sai delete also cover removing the n249, which seems a lot more useful.
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nyet
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« Reply #11 on: September 12, 2014, 03:08:30 PM »
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Got this one done now, sai is long gone. Wierd thing is most of the howtos on doing an sai delete also cover removing the n249, which seems a lot more useful.
You mean the N249 is more useful, or removing it is more useful? |
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ME7.1 tuning guideECUx PlotME7Sum checksumTrim heatmap toolPlease do not ask me for tunes. I'm here to help people make their own. Do not PM me technical questions! Please, ask all questions on the forums! Doing so will ensure the next person with the same issue gets the opportunity to learn from your ex
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turboat
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« Reply #12 on: September 12, 2014, 04:04:26 PM »
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Keeping the n249 seems useful. It's certainly working well with it still in place
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nyet
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« Reply #13 on: September 12, 2014, 04:18:33 PM »
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Keeping the n249 seems useful. It's certainly working well with it still in place
Agreed |
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ME7.1 tuning guideECUx PlotME7Sum checksumTrim heatmap toolPlease do not ask me for tunes. I'm here to help people make their own. Do not PM me technical questions! Please, ask all questions on the forums! Doing so will ensure the next person with the same issue gets the opportunity to learn from your ex
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gigabyte
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« Reply #14 on: September 13, 2014, 06:08:23 AM »
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The n249 has been bypassed on my car. After reading a few forums seems mixed views about keeping it or losing it. I might plumb mine back in see if there are any noticeable differences.....
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