Can you help explain these Dyno numbers to me?
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Cruiser
Joined: Apr 2006
Posts: 128
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Can you help explain these Dyno numbers to me?
80'' evo with hillside stage 1 headwork, 10-1 pistons (9.08-1 corrected compression and est 182.4 cold cranking compression) vthunder
3020 cam,dyna 2000 ignition module,factory cv carb reworked with cv performance parts, ness breather and white-bros 2-1
with16disks. Prior to the dyno run I was/am having an issue with slight pinging (ONLY off idle AND when hot)
To try and help this I upped the pilot to a 46 and dropped the plug gap to .035. I also backed the initial timing off a small
amount (2 marks on timing plate). This seemed to help somewhat but didn't totally take care of the issue. Im only getting this
off idle when hot....I informed the tuner this and after the tune he said that he felt like the engine wanted more timing but he
said he didn't want to do this since I told him the engine was already experiencing some pinging. Also he didn't adjust
the jetting either. He said I was rich off idle but he didn't want to change that for the same reason...I started with 12 disks
in the pipe and he ended up with 16. He uses a mustang ec997a eddy current dyno. He said he tunes by reading c02 readings not a/f
ratio which I have no idea how to read...When asking about the diffrences between his dyno and the popular dynojet dyno He says he
prefers his type of dyno better for real world tuning because of the way the eddy current (inertia) dyno is run he said it is usually
a minimum of 10% low compared to a dynojet dyno.....All this being said I was hoping some of the dyno experts here could help explain
the gas readings to me and offer any sugestions they might have for getting the best out of my build. Thanks for ANY help reading
these numbers and gas numbers
3020 cam,dyna 2000 ignition module,factory cv carb reworked with cv performance parts, ness breather and white-bros 2-1
with16disks. Prior to the dyno run I was/am having an issue with slight pinging (ONLY off idle AND when hot)
To try and help this I upped the pilot to a 46 and dropped the plug gap to .035. I also backed the initial timing off a small
amount (2 marks on timing plate). This seemed to help somewhat but didn't totally take care of the issue. Im only getting this
off idle when hot....I informed the tuner this and after the tune he said that he felt like the engine wanted more timing but he
said he didn't want to do this since I told him the engine was already experiencing some pinging. Also he didn't adjust
the jetting either. He said I was rich off idle but he didn't want to change that for the same reason...I started with 12 disks
in the pipe and he ended up with 16. He uses a mustang ec997a eddy current dyno. He said he tunes by reading c02 readings not a/f
ratio which I have no idea how to read...When asking about the diffrences between his dyno and the popular dynojet dyno He says he
prefers his type of dyno better for real world tuning because of the way the eddy current (inertia) dyno is run he said it is usually
a minimum of 10% low compared to a dynojet dyno.....All this being said I was hoping some of the dyno experts here could help explain
the gas readings to me and offer any sugestions they might have for getting the best out of my build. Thanks for ANY help reading
these numbers and gas numbers
Ultimate HDF Member
Joined: Jan 2008
Posts: 6,532
Likes: 132
From: SoCal
I'm not knocking the dyno but I used a guy 1x that used that same set up and he had every excuse in the world why he couldn't get my bike tuned and the numbers were low. After 2 days of tuning he called me said its done. He used 4th gear too. Yeah I never used that shop again for anything.
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