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2.4lr Boost creep issue need advice

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Old Feb 21, 2016, 04:16 PM
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2.4lr Boost creep issue need advice
Setup is a 2.4lr, ets t3 manifold w/mvr wg and 6266 turbo. Tom from Tscomp has been helping me with the tune and we have the wgdc at 0 (was targetting 19-21psi) so it's running off wg spring. 18psi combo hit 36psi and 11 psi hits 28psi. Both setups seem to hold boost fine until after 6-6500rpms and it ramps right up. I am thinking of trying an 8psi combo but I feel it shouldn't have to be that light of a spring to not creep. I guess I'm looking for some advice at this point.

Do I run a second WG?
Is the ETS manifold the issue?
Is this common with 2.4s with ported heads?

Thanks
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Old Feb 21, 2016, 05:07 PM
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I am thinking the ebcs may be faulty and will remove it from the equation tomorrow. I will put the lower spring setup back in and see if the WG itself is flowing enough air on its own.
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Old Feb 21, 2016, 05:20 PM
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Why are you trying to run such little boost on a big turbo set up like that?
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Old Feb 21, 2016, 08:01 PM
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Originally Posted by rotaryboxer
Setup is a 2.4lr, ets t3 manifold w/mvr wg and 6266 turbo. Tom from Tscomp has been helping me with the tune and we have the wgdc at 0 (was targetting 19-21psi) so it's running off wg spring. 18psi combo hit 36psi and 11 psi hits 28psi. Both setups seem to hold boost fine until after 6-6500rpms and it ramps right up. I am thinking of trying an 8psi combo but I feel it shouldn't have to be that light of a spring to not creep. I guess I'm looking for some advice at this point.

Do I run a second WG?
Is the ETS manifold the issue?
Is this common with 2.4s with ported heads?

Thanks
I told you to post in here hoping someone would help, but i guess ill be the one helping.

1. no
2. no
3. no

--------------

Run the lowest pressure spring that creeps the least amount and ill take care of the rest from there.

Once I introduce a load to the gate it will stop creeping.

Id like to see around no more then 20psi creeping uptop as a baseline to start with.

I think the spring chart you're using is not accurate either, so just work with real world results not paper in this case.
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Old Feb 21, 2016, 08:09 PM
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Originally Posted by letsgetthisdone
Why are you trying to run such little boost on a big turbo set up like that?
Its baseline pressure for the external gate. Its best to keep that low, (high teen's / low 20's) especially with a knock prone fuel like 93oct, which OP is running.

Also 2.4's work turbos much harder then 2.0's so what might look like low boost is really not for a larger displacement engine.

30psi at high rpm in a 2.4 is like 35-36psi in a 2.0 as far as airflow goes.
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Old Feb 21, 2016, 09:16 PM
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Is it a single or dual gate manifold?
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Old Feb 23, 2016, 05:03 AM
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Put 10 psi combo and it hit 25 at redline. I had limited time last night so after work I'm trying the 8psi to see if it lowers it another 3psi. If not I will swap a new one on from my buddy and see if maybe the WG itself is the culprit.
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Old Feb 23, 2016, 05:45 AM
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if it's a true boost creep, it should hit the same peak boost number no matter what you change the lower psi to. i had this issue on an FP red BB. i had to port out the WG port on the turbine housing to fix the issue.
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Old Feb 23, 2016, 06:25 AM
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If the manifold only has a single wastegate, this is why the new ETS manifolds have dual wastegates...
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Old Feb 24, 2016, 03:41 AM
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Originally Posted by letsgetthisdone
If the manifold only has a single wastegate, this is why the new ETS manifolds have dual wastegates...
All the ETS kits we ever dealt with single scroll (one wastegate) never had boost creeping issues, and were 44mm wastegates.
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Old Feb 24, 2016, 03:55 AM
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Originally Posted by rotaryboxer
Put 10 psi combo and it hit 25 at redline. I had limited time last night so after work I'm trying the 8psi to see if it lowers it another 3psi. If not I will swap a new one on from my buddy and see if maybe the WG itself is the culprit.
Right now your rom has no boost pressure increase from the 3 port. If I add some pressure increase at low RPM your creep may possibly go away.

Id recommend adding a boost cut first before we go any further to avoid boosting past a specific threshold. Just email me the most recent logs so i can check the load and adjust the cut based on load averages from your car.
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Old Feb 24, 2016, 02:37 PM
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Crappy weather today. I'll get a clean log after work tomorrow for you. This was with the 3 port vaccum lines disconnected so strictly gate pressure with vaccum from compressor to side port. I'll swap it back prior to the logging.

Thanks.
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Old Feb 26, 2016, 02:18 PM
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Emailed the log today. I also found the cam specs for my cams and it may be useful to you. they have a pretty high duration @1mm for a 272....looks to be higher than S3.
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