Lesser Known Torque Dips

"Neil drives a beetle and a fancy beetle" (1500sand535) 06/29/2018 at 09:32 • Filed to: None

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We all know about the 86 Twins infamous torque dip. People flatten it out with aftermarket headers and tunes.

But what lots of people may not know is that Subaru’s flat engine friends from Porsche suffer from smaller 3,000-4,000 rpm torque dips in some models. The Dyno sheet above is for an almost stock 3.2 liter engine like I swapped into my car. It’s not an awful amount of torque loss but you do feel it.

I spend a lot of my time cruising at 2,800-3,000(in part because Droooonnnneee happens at 2,400-2,600 ) and so when I try to accelerate without downshift, it’s not very exciting.

What’s also interesting is that the little torque peak at 5,000 often tempts me into shifting.

My car is not particularly fast if I cruise along accelerating from 3,000-5,000rpm but when I let it run all the way out to about 7,000 it’s a different kind of car.

TahoeSTi > Neil drives a beetle and a fancy beetle 06/29/2018 at 13:44

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Kill the drone with a 1/4 wave resonator.

Can the torque dip not be tuned out? what’s timing doing at that rpm range?

Neil drives a beetle and a fancy beetle > TahoeSTi 06/29/2018 at 14:52

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I’ve been planning on bringing my car to an exhaust shop as it’s clamped up now and I’m hoping they’ll be able to both weld it up pretty and add something for the drone.

Im not sure what tuning can do for it; I’m planning on getting my car tuned at some point but I haven’t yet; only so many $ and lots of little things to address.

TahoeSTi > Neil drives a beetle and a fancy beetle 06/29/2018 at 17:15

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https://oppositelock.kinja.com/the-cure-for-exhaust-drone-on-the-freeway-1821334755

Ask them to build something like this, you’ll have to do the math for them. I really works well to kill the drone at a specific RPM.