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Are you guys tuning for the peak torque or peak horse power when you ride above 8000 feet and the snow is deep.
DPG
DPG
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Are you guys tuning for the peak torque or peak horse power when you ride above 8000 feet and the snow is deep.
DPG
I and SRC did can/pipe pressure testing at elevation, Very interesting results , Your stock settup will not be tuned at elevation..in fact any settup will be out of perfect tune with 4K change of elevation.This is for the truely Anal[like SRC] pipe pressure will drop Aprox .2 every 1k feet. That perfect pipe pressure is what charges the cylinder from the pipe.
So if I understand this right, the peak horsepower will change as you change altitude because of pipe pressure?
Assuming that is correct how much RPM are we looking at per 1000 feet of change? 2? 25? 100? 500?
I and SRC did can/pipe pressure testing at elevation, ?.............. pipe pressure will drop Aprox .2 every 1k feet. That perfect pipe pressure is what charges the cylinder from the pipe.
So if I understand this right, the peak horsepower will change as you change altitude because of pipe pressure?
Assuming that is correct how much RPM are we looking at per 1000 feet of change? 2? 25? 100? 500?
the horse power changes because the engine runs out of air just like you do, less air = less HP = less RPM = must remove weight from Pri clutch to get RPM back
I and SRC did can/pipe pressure testing at elevation, Very interesting results , Your stock settup will not be tuned at elevation..in fact any settup will be out of perfect tune with 4K change of elevation.This is for the truely Anal[like SRC] pipe pressure will drop Aprox .2 every 1k feet. That perfect pipe pressure is what charges the cylinder from the pipe.
Ewe nailed it! I ran one can @ 3.55lbs @ 7500 feet on flat trail @ 8300, Then switched to custom built can for my 880 and instantly over reved 200 rpm,@ 8500, I clicked down one to settle back to 8300, pressure was 3.3 lbs and is spot on 3 lbs at 10K. All the mods people do and they are giving up the free HP by tuning pipe pressure.A can will NOT give max.performance at all elevations. I have the full pressure kit if anyone wants to test. rent or sale . I also learned this from lancelot and Turbo AL, very valuable info, A can is really only in the zone for about 4k feet and this means every stock can that will run at sea level will be giving up HP due to a loose can at elevation.too tight and HP drops as well and retains heat.Pipe pressure drops like a stone as you go from flatland MN (1000 ft) to ride in mtns at 9000 to 11000 or more ft.
Here is the thread on Snowest that has a great deal of info on pipe pressure.
http://www.snowest.com/forum/showthread.php?t=299780
Last winter I found pressure sensor that I hooked to my digital touch screen dash gauge. I was able to monitor my egt's on cylinders plus a third egt center of pipe plus the pressure sensor.
As the pipe temp at the belly goes up to full operating temp the pressure goes up to, so they are interrelated.
I picked up considerable performance by getting pipe pressure from just under 2 psi to close to 3 psi, 300 to 400 rpm increase at 9000 feet by just raising the pressure with pipe restriction, no clutching changes.
Its free HP almost!! Just need a gauge to find it. Appears over 3.5 psi is pushing the limits and pushes to much heat back k into cylinder causing possible detonation etc.
In the early 90's I took my Land & Sea Dyno to Cooke and Rick at Exon let me do some dyno test on my sled, Big bored 617 in a Phazer to see what was happening with the power curve. I knew about pipe pressure back then as I had designed the pipe and can and made them myself but didn't have the third EGT in the belly of the pipe or anyway of measuring Pipe Pressure.
Still alot to be learned about two strokes!!
Good Luck
So I have often wondered why someone hasnt made an adjustable stinger on the can. Is it not possible or is it just not been experimented with yet. Is it still future technology?