Need cam advice
11-01-2016, 08:31 AM
#11
TECH Regular
Duration still plays a part. Take this for example:
My cam:
226/232 @ 115 - pulls to the freaking moon hard but is a little soft off idle.
If it were on a 112, sure, the power would come in a bit sooner but it would have more overlap and idle much choppier but it's still going to make it's peak power in a similar rpm range.
Another thing is the tuning. Most tuners, won't tune EOIT. It's simple to run the numbers through a spreadsheet and modify the values. KeninAZ took my suggestion and modified his and he noticed a big difference.
Spark map tuning plays a part to. If your spark map is all jacked up and not tuned, you loose power on the low end have drivability issues, etc.
Think of duration as how long that valve stays open through the intake cycle. If it's a higher number, power will be made later in the rpm band.
If the valves close sooner, you'll make power much sooner.
My cam:
226/232 @ 115 - pulls to the freaking moon hard but is a little soft off idle.
If it were on a 112, sure, the power would come in a bit sooner but it would have more overlap and idle much choppier but it's still going to make it's peak power in a similar rpm range.
Another thing is the tuning. Most tuners, won't tune EOIT. It's simple to run the numbers through a spreadsheet and modify the values. KeninAZ took my suggestion and modified his and he noticed a big difference.
Spark map tuning plays a part to. If your spark map is all jacked up and not tuned, you loose power on the low end have drivability issues, etc.
Think of duration as how long that valve stays open through the intake cycle. If it's a higher number, power will be made later in the rpm band.
If the valves close sooner, you'll make power much sooner.
11-01-2016, 08:34 AM
#12
right on. thats how i understood it, just like u said it. didnt know that the duration played a big a part as it does (as related to where the power is made in the rpm band.) my cam doesnt have a crazy duration but its like urs, as in in its kind of a dog off idle. but it screams on the highway.
I had a Comp LSR 265 in the old 5.3, it was nasty torquey off-idle. No reason why your 216/220 shouldn't be the same.
11-01-2016, 11:23 AM
#14
It's a cam comp pn# 54-600-11. It's just not performing well and barely any HP out of it. I got the standard bolt on ls CAI shorty headers which I am changing to long tubes and exhaust. A guy at work said I should get a 228/230 cam with .589 lift/ 590 or 598 couldn't remember last number for sure.
I want to understand more about what you want to accomplish before giving any advice. How loose of a converter will you have?
11-01-2016, 07:57 PM
#15
Staging Lane
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The part number is comp cam 54-000-11 right now i have a stock transmission nothing else to it. I want to swap it out for a 4l80. I want to be able to tow a RV when I have to because of my job. But when I am not doing that I want to still have fun with my truck.
11-02-2016, 11:26 AM
#20
TECH Regular