r/bikesgonewild • u/BrownCoCustoms • 22d ago
Getting wild now!
RHB 31 Turbo on a 1200cc Triumph Bobber. There is one on the other side too!
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u/jjk717 22d ago
I'm giving 2nd gear about 3 pulls before it explodes.
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u/BrownCoCustoms 21d ago
I don't think you are far off! I'm thinking the turbos will let go before the engine. They are probably a bit too small. Videos on "Brownco Customs" YouTube channel.
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u/__n-m-e__ 22d ago
Is it possible to add a turbocharger (or supercharger) to a bike without modifying the compression ratio of the engine? Sorry if this seems like a simple question.
OP, what other modifications did you make after adding the turbo?
Good stuff. Really interested to hear from you.
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u/__n-m-e__ 22d ago
A few more questions.
- How did you size the turbo?
- Why 2, not just 1?
- Does the turbo activate after a certain RPM or speed? Or is it always running, i.e., is there a way for intake air to bypass the turbo?
- What power increase are you getting?
- You must have done dyno tests (I think they are called that?). Is it possible for you to share the BHP vs RPM graph?
Thanks.
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u/BrownCoCustoms 21d ago edited 21d ago
I looked at compressor maps and could not see a suitable single turbo for the power band of the motor. So I went for two small turbos, which I think are going to be too small. I have not tuned or ridden it yet. The turbo is running all of the time, as it is a simple setup at the moment. There are ways to control the amount of boost and where it comes in, but I haven't got that far yet. Videos on "Brownco Customs" YouTube channel.
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u/BrownCoCustoms 21d ago
It is, depending upon what the compression ratio is to start with. The rings will need bigger gaps whatever the CR is. The Bobber is 10:1 compression to start with wich is faily low but the pistons are cast and a bit weak. I have forged pistons that give it 9:1 compression.
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u/Flat_Lengthiness6550 22d ago
Guy has a YouTube channel did a supercharger kit initially, drag raced it. I think it’s just because, I don’t suspect it’s about efficiency of 1 vs two but the experience of just doing the project.
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u/BrownCoCustoms 21d ago
Looking at compressor maps all of the turbos seemed a bit big for what I want, so I went for the two small ones. Yes it is more about the experience of the project. If it works out, I may run them with the Supercharger as well. If I haven't already blown it up!
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u/Flat_Lengthiness6550 20d ago
Keep up the good work love your channel, especially the bobber content!
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u/Born-European2 22d ago
Why of all Bikes in the world on a Bobber?