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8219
Joined
1/11/2016
Location
Tombstone, AZ, USA
Edited Date/Time
11/11/2021 6:46am
I remember the days of DV running an FMF pipe and PC silencer, and RC picking PC on his RMZ when Seb was on a yosh. Do factory guys still get to pick and choose or are they locked into what the team deals are?
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when i had my cr250 i had a PC exhaust w/ the old r304 stinger style silencer and i had an fmf fatty w/ the powercore II silencer.
the fmf fatty hit WAY hard when it was properly jetted and i actually ran it a bit rich just to slow it down. bike ran mint!
I miss the super trick header pipes.
The engine has to have its fundamentals sorted and the timing and fuel delivery is optimised for that.
Mapping is not a 'fix' for hardware. Especially on naturally aspirated engines and especially NA engines tuned to (or close to) the limit, like a high revving high powered bike engine in a factory/ pro level chanpionship.
I'm not sure if the factory bikes use a MAP sensor, I'm sure I've seen lambda sensors and additional wiring on a few bikes as I naturally notice it from fucking with wires all day long at work, but lambda usually go hand in hand with MAP, though I appreciate they can be useful for testing without a MAP / Barometric sensor... BUT when neither are present as is the case 99 times out of 100 on dirt scooters and tuning in Alpha-N (Alpha being throttle position, N being revs, basically mapping solely on a throttle opening Vs RPM) it is more crucial to have the pipe, cams, etc tuned for what you are trying to achieve as you are far more limited in what you can control, though it's still perfectly workable on NA motors, as proven by it, well, working...
As for the pipes, you only have to look as far as Coop and Marv or supercross vs outdoor setups to see the differences in the length of the front pipe, differences are often plenty visible in MXGP bikes also.
I think for 99% of us it wouldn't matter much at all on a four stroke, they're relatively smooth regardless and it likely mainly changes where the power is at, but when you're super fast and super particular or know exactly what benefits you, like taking some bottom away to make it easier to hang onto and faster up top for a big open outdoor track, pro's will totally reap that benefit.
I get they can't talk about the majority of it, but it'll be sweet to hear about it in a few years time.
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