I'd like to think I've done my research, but I haven't found an answer to my question. Basically is a 221/221 .558/.558 on a 111 lsa too much to maintain driveability in my 5.3L?

I'll be running it off a tt3000 stall and EFI Live is in the mail as we speak to I can tune it myself.

The only things I've been able to find about a 111 lsa is the tr230/224 and the lift on that cam is much higher than what I want to run. I've also read that a 112 lsa is harder to tune than a 114 lsa but the 112 will make power sooner than the 114 will.

I have nitrous in mind eventually but I won't even beging collecting parts for that for at least a year.

So basically how hard will a 111 lsa be drivability wise? I drive 95% highway if that matters. Thanks

 

oh no driveability has not been an issue, just make sure with the stall you have a good trans cooler to keep it cool, and the 112lsa would be good for the nitrous to

 

LSA is only part of the equation. Duration is the other half. A better reference when comparing the drivability of one cam versus another is overlap.

Overlap = ((intake duration + exhaust duration)/2) - (2 * LSA)

220/220 - 114
X = ((220 + 220)/2) - (2 * 114)
X = -8* of overlap

220/220 - 110
X = ((220 + 220)/2) - (2 * 110)
X = 0* of overlap

When you have the same duration, a tighter (smaller) LSA will increase overlap and therefore decrease drivability.

The more negative you go, the less overlap you have. So, the 220/220 - 110 cam has 8* more overlap than the 220/220 - 114.

 

EFI live will not tune your ride. It is for logging purposes only.

 

there's a lot of tech articles just like this over on tech. i'll post some links when I get home.

the 111 lsa will have quite a choppy idle too compared to the 114. like sport side said, the more overlap the less drivability and the more choppy idle.

 

How do you figure? I have the commercial edition which includes everything to log and tune but a wideband.


EDIT- Also thanks a bunch for the good info on overlap. I just did a quick search after reading what y'all posted about overlap. With 0* overlap, am I going to have problems? I've noticed the Blower cams have like 50* overlap. How is 0* going to respond? Thanks in advance.

 

I'd assume 50* of overlap was measured at .006'' lobe lift. At .050'' lift, the lobe has decreased in size, so therefore, overlap is less. For example, at .200'' lift, a TR220-112 has -83* of overlap.

 

oh I see. Yea I was looking at thunder550's "trucker cam" he had for sale and it was advertised as having 50* of overlap.

So basically, how comparable is this cam to a tr220 or tr224 on a 112 lsa for each as far as driveability and the powerband? I had those two in mind as well, but I may be able to get a good deal on the 221/221 comp cam.

 

I'm pretty sure -8 is more negative than zero :smash:

 

I had no driveability problems with the 222/224 112 it just needed a 3400 stall to really come out the hole good. I wouldnt be shy about running that cam just be prepared to run a decent size stall with it, a 3K isnt going to get it done in your ec truck, unless you have just have a freak truck.