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BRZ First-Gen (2012+) -- General Topics All discussions about the first-gen Subaru BRZ coupe


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Old 03-11-2021, 09:57 AM   #1
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Eliminating torque dip

Is it necessary to swap out stock header to address torque dip or can a tune alone do the trick? I prefer to have a cat for sound and environmental reasons.
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Old 03-11-2021, 10:08 AM   #2
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A supercharger takes care of that.
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Old 03-11-2021, 10:20 AM   #3
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Is it necessary to swap out stock header to address torque dip or can a tune alone do the trick? I prefer to have a cat for sound and environmental reasons.

The headers do help decrease most of the torque dip. A tune can also help, but preferably with the help of a new header. Or like the comment above, boosting resolves that too. It all depends on what application you plan on sticking with (NA/Boost). If you add a turbo, you'll have to change the headers anyways. You can get for example, a JDL UEL/EL and be able to add a SC without replacing the headers.
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Old 03-11-2021, 10:20 AM   #4
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A tune will help, but not too much.

https://www.ft86club.com/forums/showthread.php?t=121315
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Old 03-11-2021, 10:31 AM   #5
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E85 tune will do it if you have E85 available.
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Old 03-11-2021, 11:13 AM   #6
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My understanding is that removing the cats (either with an aftermarket header or by decating the OEM one) is what allows the tune to improve the torque dip. On top of that, the 2017+ engine changes make the tune+header less noticeable vs. the pre-2017 models.
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Old 03-11-2021, 12:01 PM   #7
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Catless header and tune. Like 80% gone and for sure noticeable driving round town
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Old 03-11-2021, 12:21 PM   #8
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I run a catted header (ft86 speed factory) with a tune from Mike @Xero-Limit and I don't seem to have the dip anymore.
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Old 03-11-2021, 12:37 PM   #9
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Quote:
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Is it necessary to swap out stock header to address torque dip or can a tune alone do the trick? I prefer to have a cat for sound and environmental reasons.
I believe the simplest answer, already addressed by folks here is this.

A tune alone will improve power all around a bit, but will still give you the torque dip feeling, just improved.

A header and tune gives the feeling of a smooth torque curve, AKA dip eliminated.
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Old 03-11-2021, 04:17 PM   #10
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You can easily eliminate the torque dip, by staying above it. When you drive the car seriously you will never see that dip.


I dunno, kids these days.
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Old 03-11-2021, 05:45 PM   #11
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You can easily eliminate the torque dip, by staying above it. When you drive the car seriously you will never see that dip.


I dunno, kids these days.

Agreed. Other than the first gear dip, you can keep the revs up high and never get back into that dip. Downshift when needed and when you should, and you won't have to worry about it.

That dip is there to remind you that these engines are a balance between decent performance and good fuel efficiency.

Perhaps the OP should consider an automatic only 2.0 liter Supra instead of a twin.
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Old 03-11-2021, 06:00 PM   #12
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Agreed. Other than the first gear dip, you can keep the revs up high and never get back into that dip. Downshift when needed and when you should, and you won't have to worry about it.

That dip is there to remind you that these engines are a balance between decent performance and good fuel efficiency.

Perhaps the OP should consider an automatic only 2.0 liter Supra instead of a twin.
Thx for explaining the reason for the torque dip. I never knew it was meant to remind me of something
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Old 03-11-2021, 06:05 PM   #13
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Some headers will put a torque hump where the dip was. I personally prefer to drive above 4500 rpm and replace the short block every year. I also masturbate with a shoe rasp in my ass and wear my shoes on the wrong feet.
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Old 03-11-2021, 06:08 PM   #14
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Agreed. Other than the first gear dip, you can keep the revs up high and never get back into that dip. Downshift when needed and when you should, and you won't have to worry about it.

That dip is there to remind you that these engines are a balance between decent performance and good fuel efficiency.

Perhaps the OP should consider an automatic only 2.0 liter Supra instead of a twin.
You're right, wanting to be able to keep up with traffic without having to wring out the engine is for mouth breathers.
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