Cyl Volume Parameter
Thread Starter
Joined: Nov 2001
Posts: 5,649
Likes: 9
From: Warr Acres, OK
Cyl Volume Parameter Anyone know for sure how important it is for this parameter to match the actual size of the engine? I'm looking at the file from car with a 408 ci engine tuned by someone else that this parameter was never changed to reflect the new size. What all would this effect in the tune? I'm guessing maybe the values in VE table.
every fuel calculation gets multiplied by it (read the 've cracked' thread) so it's a universal multiplier. if you keep it fixed even though your displacement did go up, your engine's VE is gonna suddenly be proportionally high to make up for the difference. think of it this way:
3*2 or 2*3. they both come out to the same thing. except that VE can be meaningful and helpful when it's calculated from/reflecting numbers true to the hardware.
3*2 or 2*3. they both come out to the same thing. except that VE can be meaningful and helpful when it's calculated from/reflecting numbers true to the hardware.
FormerVendor
Joined: Jan 2003
Posts: 525
Likes: 0
From: Melbourne, Australia
Originally Posted by 2xLS1
Anyone know for sure how important it is for this parameter to match the actual size of the engine? I'm looking at the file from car with a 408 ci engine tuned by someone else that this parameter was never changed to reflect the new size. What all would this effect in the tune? I'm guessing maybe the values in VE table.
As an example, GM set it to 5.7L for many of the first released LS2 6.0L engines
FormerVendor
Joined: Jan 2003
Posts: 525
Likes: 0
From: Melbourne, Australia
Originally Posted by RedHardSupra
every fuel calculation gets multiplied by it (read the 've cracked' thread) so it's a universal multiplier. if you keep it fixed even though your displacement did go up, your engine's VE is gonna suddenly be proportionally high to make up for the difference. think of it this way:
3*2 or 2*3. they both come out to the same thing. except that VE can be meaningful and helpful when it's calculated from/reflecting numbers true to the hardware.
3*2 or 2*3. they both come out to the same thing. except that VE can be meaningful and helpful when it's calculated from/reflecting numbers true to the hardware.
Thread Starter
Joined: Nov 2001
Posts: 5,649
Likes: 9
From: Warr Acres, OK
Thanks for the clarification. Why don't you HPTuners owners add these little tidbits of knowlege you all have to the help file? Is there a reason you give us access to parameters that don't effect much or are not very important?
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FormerVendor
Joined: Jan 2003
Posts: 525
Likes: 0
From: Melbourne, Australia
Originally Posted by 2xLS1
Thanks for the clarification. Why don't you HPTuners owners add these little tidbits of knowlege you all have to the help file? Is there a reason you give us access to parameters that don't effect much or are not very important?
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