Dynotesting Royal Enfield Continental GT 650 with Offtrails Hyperstroke S1 Race Exhausts. Is it worth it?
- Offtrails Moto
- Apr 9
- 3 min read
Words by Gavin Lesly
At the heart of this dyno test is my motorcycle, a 2020 Royal Enfield Continental GT 650 which has done 25000Kms , been lovingly fiddled with, polished, tweaked and with a dream of going ' just a little bit quicker'. The test was done to know more about the condition of my motorcycles engine and to check if the 3 year old Offtrails Hyperstorke S1 Race exhaust is functioning properly.
"It never gets this hot in Bangalore" the guy at the testing centre told me drenched in sweat.
"Is it bad weather for the test?" I asked him.
"Yesterday we did a C63 AMG on the other dyno (referring to the large dynamometer) producing 700 hp at the wheel and the car over heated. We did two runs and that was it." he replied while walking towards a smaller dynamometer for motorcycles made by Powertronics in Bengaluru.
" Never mind, Lets get the base run with stock exhausts then." I replied while googling 'how does humidity affects the power output of an internal combustion engine'.
The process
The bike was then tied down on the dyno. He turned on a large fan to cool down the motorcycle during run. Started the motorcycle, connected a laptop to the dyno and then he took the readings. " I took two readings, we got around 42hp at the wheel"(stock setup) the operator shouted. Where does the other 5hp goes as claimed by the company? I was curious.
"This reading is at the wheel, not the engine power. We loose a few horses while transferring it to the wheel, and humid condition is not best for maximum output. Are you using any fuel injection optimisers" ? He said after turning off the engine.
Fuel injection optimisers are used to optimise fuel delivery for motorcycles with aftermarket exhausts, high flow airfiltrers etc. What I have here is the basic version and it comes with a single map optimised for wide range of conditions. These were the cheapest option we have in the market to optimise the fuel delivery.
"We will be chip tuning after putting the free flow header pipes on and get rid of the optimisers soon" I responded.
The stock exhausts were hot after the run and we had to wait around 15 minutes to remove them. I installed the Race exhausts and it was ready for the dyno test. Started the bike, We kept it on idle for 10 minutes for the engine to realise (feedback from the system) it's getting more air now, and hence it requires more fuel to make bigger explosions to produce more power. After doing two runs, the operator said turning to his laptop, "This bike is making good power". Here's the result obtained depicted on a line graph.
Results
The idea is simple. Give more fuel and air, make bigger and efficient combustion, resulting in more power and torque. But does it actually work? What you see below isn't some messy scribble made by a toddler with colour pencils. This here is three dyno runs; the green being stock setup and the other two blue and pink being the setup with Offtrails Hyperstroke S1 Race exhausts.
The second run came out with 45.5 hp @7250 RPM and 50.9 Nm @5250 RPM at the wheel which is around 8% increase in power compared to the stock run. The peak torque compared to the stock has only been increased by 1.5Nm or 3% but if you watch closely at the graph there is a spike in torque of around 4Nm between 3500 and 5000 RPM which is the speed at which the motorcycle is mostly run.
Final Thoughts.
Stock exhausts are alright, they works, safe, sensible, environmentally responsible- after all manufacturers spend millions developing them, to make them more polite.
In other words, they are boring.
Now slap on an aftermarket exhaust, chose the best exhausts you can find on the market, then the motorcycle turns into something else. It makes noise, goes fast and scare pigeons. Its more nimble to ride around the city and on the corners as it drops around 6 kgs. Something that sounded like a dyson hoover came alive and made me grin like a fool.
Spending only a weekend trips money on Hyperstroke S1 Race with 8% increase in Power and 6Kgs reduction in weight makes sense to me. What do you think?
Gavin Lesly
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