Cams/EFI

[Jason_Leone at amat.com]

My $.02 on the cam thing, for forced-induction:

1) Large lobe center angle (114+)
2) Longer EXHAUST duration (of have larger exhaust valves!)
3) High lift is fine

To appease the list admin, here's an EFI related topic that's related to cams:

My software for the Electromotive TEC II has a "blend" feature that is meant to
smooth out the idle in radical cam equipped engines. As we all know, Speed
Density isn't the greatest EFI method for radical cam IDLE. So, the "PAF Blend"
software can use a percentage of the TPS signal and a percentage of the MAP
signal to "blend" in a smooth idle. Do other equal price range aftermarket
systems have this feature? I have 268 cams in my car (~224 duration @ .050"
check), so they're a little bit on the "hot" side of things (for a street VW).
Exhaust duration is slightly more than intake, and lift is ~11.5mm or so
(~.452"). When tuned right, they scream from 4.5k-7.2k rpm...and the Schrick
variable geometry intake manifold makes up for the low end torque (between 3k-4k
rpm).

Does this "blend" feature work? Idle hunts a bit, but I think it has to do w/
the lack of an IAC valve. Have to bump idle up to about 900 rpm (up from 650
rpm), and tweak a lot of little variables in the software.  I think it would
work great in a big V8 NA engine w/ a radical overlap cam. Food for
thought...for you V8 guys. I'm sure you guys have been there, done that
though...

Jason
'93 SLC