Full termi exhaust reduced heat, full akro increased. Normal?

craig bush · Apr 25, 2024

Donnie said:
Got bike back from Ducati. I asked to look at why its wanting to stall at low revs and why increase to unbearable heat. Main mechanic rode bike and said bike isnt for street now. Track only. At least hes honest.

The full termi wheelbarrow exhaust made the streetfighter a pleasure to ride, even in 40 deg heat. Full akro on panigale wants to stall at low revs and quickly feels like the heat of hell.

He said heat might be bearable in winter here in bangkok, just now its high 30s sometimes into 40c. Im not convinced as a night ride is basically just as painful as day rides.

The akro mapping seems to be way more agressive than the termi.

Im not going to track this year so im thinking of getting less agressive map made, basically a rideable street map and then i can flash the akro map when i track. Not sure what else to do.

Maybe running lean? Have someone put a sniffer on it.

BP PanigaleV4S · Apr 25, 2024

Eventually both stainless and Ti will get to the exact same temperature, which is the temperature of the exhaust gas. If the thermal conductivity of titanium is 17 W / mK and stainless is 15 W / mK all that means is the stainless will take longer to get hot and take longer to cool off. It's hard to compare the exact numbers because the exact material composition isn't known.

SirJAG · Apr 25, 2024

bp_SFV4 said:
Eventually both stainless and Ti will get to the exact same temperature, which is the temperature of the exhaust gas. If the thermal conductivity of titanium is 17 W / mK and stainless is 15 W / mK all that means is the stainless will take longer to get hot and take longer to cool off. It's hard to compare the exact numbers because the exact material composition isn't known.

I like the data good detail. There must be more to story though..as I was measuring 50F differences sometimes more. specifically 6-8inches from the rear header, as that is where i was getting blisters! I could feel the differences just with my hand hovering in the area of the rear header. I took the measurements AFTER rides when temps were prolly as high as possible. I think there is some heat soak going on too with the rear subframe...it gets pretty damn hot.

Keep in mind i'm in texas summers too, so 105 ambient temps not uncommon...hell a may track day at cota a couple years ago was 100F in the pits...wow what a day...

JAG

craig bush · Apr 25, 2024

bp_SFV4 said:
Eventually both stainless and Ti will get to the exact same temperature, which is the temperature of the exhaust gas. If the thermal conductivity of titanium is 17 W / mK and stainless is 15 W / mK all that means is the stainless will take longer to get hot and take longer to cool off. It's hard to compare the exact numbers because the exact material composition isn't known.

Great point - the amount of radiated thermal energy (heat) rwill eventually be nearly identical, only the rate would change.

So the Ti exhaust might measure 200 F radiated at 6” from the pipe in 5 minutes, and the stainless exhaust might take 6 minutes to measure the same.

You’d have to use an insulator or barrier (coating, heat wrap, or heat shielding) to reduce tha actual amount of radiated heat.

AK390 · Jun 29, 2024

Donnie said:
Not to say dealers are always right but my dealer advised an exhaust on the panigale when discussing heat.

sadly in my situation the panigale got tremendous increase in heat with full exhaust over stock.

So i guess a question is , does a panigale get hotter with a full exhaust?

Assuming a termi and akro offer similar heat reductions?does it really not working even with the heat shield ?

baggerman · Jun 29, 2024

bp_SFV4 said:
Eventually both stainless and Ti will get to the exact same temperature, which is the temperature of the exhaust gas. If the thermal conductivity of titanium is 17 W / mK and stainless is 15 W / mK all that means is the stainless will take longer to get hot and take longer to cool off. It's hard to compare the exact numbers because the exact material composition isn't known.

You do make me laugh. I suggest you 2 rethink this. Funny though thanks.

JLAD · Jun 29, 2024

Slip on Termis on my 2023 has reduced heat quite a bit in my opinion.

AK390 · Jun 30, 2024

guess you need to go for the titanium full system

Phl · Jun 30, 2024

Heat retained with the stock can is the worst due the cats and overall material keeping the thermal mass.

My mod gets rid off the cats and opens up flow, allowing gases to escape quicker.

A slip-on with a non-metallic outer shell (carbon) is even better.

Did some experimenting on the 1199 with heat wrap on headers, made no significant difference.

Paul G · Jun 30, 2024

I'm guessing the biggest difference as well as the pipe routing, shielding and the cans is the fuel map. Richer is cooler

2BikeisLife · Jul 1, 2024

Donnie said:
Bangkok heat and traffic.

Hope everyone caught this when trying to relate their experience.

That being said, I went with Termi (not the full system) and a CF under-seat heatshield. Zero heat issues in up to 32C temps with leathers on.

If you are wearing shorts/jeans, you're on the wrong bike.

Full termi exhaust reduced heat, full akro increased. Normal?

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