Dyno numbers - 2.5inch Headers vs Stock headers

[Dr.D]

I have added 10% fuel across all RPM for now but havent got a chance to test it as its too wet and cold outside

Where are you located? I have a tuner in Knoxville TN that can really tune. They have worked on both my Rockets.

 

[sunny]

Where are you located? I have a tuner in Knoxville TN that can really tune. They have worked on both my Rockets.

Detroi/Michigan Area, I am 520miles away from you

 

[TURBO200R4]

Detroi/Michigan Area, I am 520miles away from you

time for a vacation
lol

 

[Idaho Red Rocket 3]

My experience is that a big header and an open exhaust won´t help that much with a stock bike.
There can be some gain, but usually nothing really serious.
If you add some high lift long opening camshafts it is a different game.

Penner who is offering cams for the 2.5L bikes ? Working on getting more HP out of a 2021 GT to go back to Bonneville Salt Flats in 2025 for another record run. I messaged Neville Lush about cams. He said he has decided not to develop cams for the 2.5 L bikes.

 

[Penner]

Penner who is offering cams for the 2.5L bikes ? Working on getting more HP out of a 2021 GT to go back to Bonneville Salt Flats in 2025 for another record run. I messaged Neville Lush about cams. He said he will be retiring in a little while and has decided not to develop cams for the 2.5 L bikI am not sure if the TTS-guys have them.

Could be the TTS guys have them. But otherwise no one I know of. As the ex-cam has decompression mechanics they will not be easy to manufacture.

 

[Gimlet]

Could be the TTS guys have them. But otherwise no one I know of. As the ex-cam has decompression mechanics they will not be easy to manufacture.

Don't they supply replacement cams and pistons for those who want their premium max-power supercharger kit?

 

[stingray]

 

[sunny]

I have added 10% fuel across all RPM for now but havent got a chance to test it as its too wet and cold outside

I rode few days ago with (new map) with 10% fuel and it was noticeable difference in power,

I ordered stuff for street tuning rocket which I will install during winter months and then fine tune it with Data from Tuneecu App + Data from Kit (photo below) I ordered when weather gets better next year.

 

[vsteel]

you mean quartermile

Yes, that would work or ideally on the same dyno on the same day or close to the same time, so you can get a lot more data and have the results with fewer variables.

 

[Penner]

I have just seen a dyno run with a Paul Bryant header and exhaúst that made a good 40hp gain over stock.
It was an unrestrited map and AFR adjusted. As you usually get about 30hp with just an unrestricted map it is about another 10hp with it.
And the engine was otherwise stock.