Not hitting target boost after catless DP

[Xlohen]

Installed some catless Dp over the weekend and realized no longer reaching targeted boost, reaching 20/21 psi of boost instead of usually 23/25, with phearable 1.5r tune, currently 66 degrees over here, I took the turbo inlet pipe so I’m guessing the gaskets need replacing, a tech in my shop suggested it’s just cause of easier flow but I have my doubts, what do y’all think?

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[dstix747]

The TIP is where I'd start. Did you reuse the gasket? Bad juju on that gasket. The downpipe gasket is reusable but not so much the TIP one.

 

[Xlohen]

The TIP is where I'd start. Did you reuse the gasket? Bad juju on that gasket. The downpipe gasket is reusable but not so much the TIP one.

Yeah lol I ended up reusing the TIP gaskets, but I did order some new ones yesterday that should get here today, hopefully that will just fix the issue

 

[LBP]

I think the tech is correct. IIRC our ECUs use torque targets based on airflow/volume and fueling measurements and the improved flow efficiency of the new downpipe could allow your engine to reach the torque target at a lower boost pressure. The good news is that you’re making power more efficiently and have a bit more overhead from which to extract power. The slightly less good news is that you’ll need a custom tune to fully take advantage of it.

I had a similar experience when I upgraded my downpipe without a retune - dropped about 1.5psi off peak boost yet the butt dyno said the car definitely wasn’t any slower.

In this case, as long as your fuel trims are good, I think you can just send it. Get a custom tune at some point and enjoy.

 

[Xlohen]

I think the tech is correct. IIRC our ECUs use torque targets based on airflow/volume and fueling measurements and the improved flow efficiency of the new downpipe could allow your engine to reach the torque target at a lower boost pressure. The good news is that you’re making power more efficiently and have a bit more overhead from which to extract power. The slightly less good news is that you’ll need a custom tune to fully take advantage of it.

I had a similar experience when I upgraded my downpipe without a retune - dropped about 1.5psi off peak boost yet the butt dyno said the car definitely wasn’t any slower.

In this case, as long as your fuel trims are good, I think you can just send it. Get a custom tune at some point and enjoy.

Having to retune for more power is never bad news thanks for the info!!

 

[m_kluch]

Are you reaching your target air charge when looking at a datalog? Thats what you would look for instead of target psi.

 

[Xlohen]

Are you reaching your target air charge when looking at a datalog? Thats what you would look for instead of target psi.

I’ll try to data log today and see

 

[Xlohen]

Either way by the end of the day I’m changing out the gaskets for good measure got both for 14 bucks straight from honda

 

[Xlohen]

The TIP is where I'd start. Did you reuse the gasket? Bad juju on that gasket. The downpipe gasket is reusable but not so much the TIP one.

Problem is solved after replacing TIP gaskets!!!

 

[LBP]

Interesting! Congrats.

 

[rtypefk8]

The TIP is where I'd start. Did you reuse the gasket? Bad juju on that gasket. The downpipe gasket is reusable but not so much the TIP one.

Thanks, I am also about to do that install. Will make sure I get new ones

 

[dstix747]

Thanks, I am also about to do that install. Will make sure I get new ones

I would think the tip would come with that gasket. My 27won tip did but I'm not sure whether other brands include it. Also don't forget to clean the mating surface with window cleaner.

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