compression, cam and powervision
Road Master
Joined: Nov 2015
Posts: 1,236
Likes: 387
From: georgia
It’s not a number that is set. When idling, the kpa will hover around a certain number— what does it read when idling?
Maybe I should ask what is the manifold absolute pressure in kpa when idling?
Maybe I should ask what is the manifold absolute pressure in kpa when idling?
Last edited by jbarr1; Jul 16, 2019 at 02:24 PM.
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Cruiser
Joined: Apr 2017
Posts: 103
Likes: 5
From: Liverpool NY
They are installed all installed properly. I'm waiting for FM to get back to me with their thoughts on the tune and log I sent them, but I'm still trying to figure out what I can on my own. I will continue to autotune and see what happens...rain here today and tomorrow so I'm in a holding pattern.
HDF Community Team
Joined: Jun 2006
Posts: 12,776
Likes: 2,607
From: san antonio
If your setup is 96", standard chamber volume of 86-86cc, OEM head gasket thickness, normal deck height for that motor, flat top pistons and SE255 cams, your 196/205 CCP numbers are too high. CCP for that configuration should be around 185psi, so something is off. Could be a bad gauge, or the configuration is different from the above listed combo. Maybe missing something but still think it a tune issue based in the symptoms in the OP.
Last edited by djl; Jul 17, 2019 at 09:54 AM.
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Cruiser
Joined: Apr 2017
Posts: 103
Likes: 5
From: Liverpool NY
I'm wondering if the compression numbers would indicate a cam issue. I'm thinking of pulling the cover off and checking but would like to avoid that if the numbers don't indicate that much of a variance. I thinking it is a tune issue but if I have to open it back up I will.
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Grand HDF Member
Joined: May 2014
Posts: 3,843
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From: florida
Yeah, you are probably right about the exhaust...gonna change up this winter but just cant swing it right now. I did a few autotunes on the bike with the stock cams and it really snapped it up, then of course I immediately took those cams out and put the 255's in. I am waiting to see what FM says and I may just take a look at the cams tomorrow so I can sleep well. I aslo dont understand how the O2 sensors can possibly be connected backwards and I cant locate the plugs under the side cover. I would imagine if I disconnected one of them I would get message on the tuner as to which one is not connected/sending.
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