Riding for 53 Years
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- Today, 23:49
- May 6, 2019
- Sydney,, Australia
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If only it was that simple, just a software change.Explanation...The Thruxton R. has 97 hp at just 6850 rpm. 8 more than the Scrambler at 7400 rpm. The easiest way to increase the R hp would be to raise the revs but it’s ECU closes the throttles 15 % at 7000 rpm then shuts off at 7400. Modifications to the tune are severely restricted by Triumphs decision to disallow any entry by the aftermarket into the the computer which has a key or entry code that Triumph will not divulge.My point was if we install the Scrambler ECU on the R we should gain an easy 8 hp or so .Both engines are the same but the Scrambler exhaust is obviously very restricting to the point of lowering the hp from 97 to the low eighties, not good. Answer, turn it up an extra 550 rpm to get it up to 89 and tell the comrades they moved the power band down for more low end torque. When in fact the rpm has moved up. Marketing Rules The World!
The exhaust is a tunes pipe and its length for a fixed pipe diameter determines that pipes rpm for peak torque.
The Camshaft's timing , plays a big part in the torque output through the range.
Advancing Inlet timing for low down torque and retarding the Exhaust for higher RPM. Applies for a single Camshaft engine.
When two Camshafts are separate by design , then the Overlap is another factor.
Its been used in Superbike and Supersport racing for the last 30 years or so ,by race teams by slotting the Camshain Sprocket bolts to get these engines to Rev higher.
The sports regulations have been stating what can be done in Catch Up Mode for a long time.
The fuel injection is just a Air to Fuel mixing device.
But its easy to restrict an engines output , by retarding the ignition as the revs go up.
That way , it just won't produce any power high up.
Its a lousy way to run an engine.
But there maybe sound reasons, is. Engine Longliveity.!
If one wants to check a exhaust for restrictions, take any sensors out of it, the push a Camera up the exhaust.
Silencers, generally won't allow this , as they move the gas around by Magic, truly amazing pieces of engineering.