TOAK, The Thread of All Knowledge part XIV.

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#27461

07-08-2023, 10:41 AM

Tonebender

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Good late morning. Picked myself up a Turtlebox bluetooth speakers. This thing is awesome.

#27462

07-08-2023, 10:42 AM

PapaThiele

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Quote:

Originally Posted by nevada72

Cheryl and I rented a UTV and explored the trails on our down day. Not a cheap date, but very fun. The place that rents Indians has them.

Timdian will be there in a flash

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#27463

07-08-2023, 10:52 AM

gamble71

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Mornin toakers. Leisurely day so far

#27464

07-08-2023, 11:02 AM

zal

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Quote:

Originally Posted by PapaThiele

Timdian will be there in a flash

Hahaha.

#27465

07-08-2023, 11:05 AM

rocket23

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Quote:

Originally Posted by nevada72

Agreed. But Harleys respond very well to reduced back pressure. It's a very primitive ICE by current standards (not that there's anything wrong with that - all my bikes fall into that category). You increase gas/air and reduce back pressure, HP goes up. It's one of the few motors that you can run straight pipes and not ruin performance.

oh, I bet I can.

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#27466

07-08-2023, 11:06 AM

rocket23

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Early afternoon woods.

#27467

07-08-2023, 11:10 AM

gamble71

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Open pipes are good for cheap hp. A properly designed exhaust system will increase hp and torque.

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#27468

07-08-2023, 11:23 AM

NoRegerts

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Dynamic charts show the M8 likes more back pressure than not. Removing the cat reduces low end torque. That's where a properly designed exhaust and tune come in.

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#27469

07-08-2023, 11:33 AM

rocket23

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#27470

07-08-2023, 11:33 AM

nevada72

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Quote:

Originally Posted by gamble71

Open pipes are good for cheap hp. A properly designed exhaust system will increase hp and torque.

You got that right. I've played around with it, and it's amazing. I had a D&D Fatcat on my 2011 Ultra with stage 3 107. Bike moved out well, but was too loud for long touring. So I switched to a Supertrapp 2/1. Damned if that didn't just cut the bike off at the knees. I had it re-tuned and it dropped from 96 HP to 82. So in the case of a built Twinkie motor, less back pressure = better HP. Can't speak for M8s.

The other thing - the felt heat went WAY up with the Supertrapp. It melted Cheryl's boot sole. The D&D was way cooler because it was less restrictive.