I have to agree here, there are a few steps that should be taken to verify that everything will work together.

First, duration @.XXX lift will have to be verified then plotted on a chart to determine maximum retardation/advancement of the VVT actuator that is acceptable for the selected camshaft. This will need to be compared to a graph of Piston Height in the cylinder bore for say 40* of crankshaft rotation on either side of TDC, that'll effectively give you piston to valve clearances (when you add some variables for valve clearance closed, and use some trigonometry for the final calculation) for 20* of camshaft rotation on either side of TDC (cam rotates 1/2 speed of crank). This should tell you what the maximum values are for advancement/retardation of that specific cam are. There are companies that sell VVT range limiting kits, but I believe you should also be able to program in the tables what * maximums you want.

Unfortunately, to get the lobe profiles you'll either need a "Cam Doctor" and have already purchased the camshaft or a file with the lobe profile plotted on a graph from the company you're intending to purchase from. Remember if you're using rockers larger than stock ratio, you'll need to adjust the lift profile accordingly.

It's all about maintaining that PTV clearance, that's really what matters here, while retaining the widest torque curve possible.

 

KEEP IT! We just did a cam swap on a truck with VVT...no headers or intake or anything else. We installed the cam and tuned it and it picked up 60+rwhp and drives like stock!

 

Cam specs?
How hard or extensive was the tunning?
Where the 60 hp gains compared to stock tune or the truck was already tuned?

 

It was mid 2-teens on the intake, and mid 220's on the exhaust. Sorry, they don't let us give all the VVT cam specs out. It is a new one we made for the truck guys wanting to run stock converter, mostly stock sounding idle, but wanting the extra power! The truck showed up bone stock, untuned and all.

 

I really wish ya'll would put at least those details on your website and allow people to purchase just the cam. I called this past November and the smallest cam I was told ya'll offer was a low 220 intake and high 220 exhaust. I thought this was too big so I went with the small Comp Cam that has nearly the same specs as what you just mentioned but without a phaser table.

 

Yea, I've been begging but the powers-that-be aren't ready to share that R&D (specs) just yet. We just finished this one, so last November it wouldn't have been available yet

 

While i understand why yall dont want to give up your specs they ARE going to get out. Someone will camdoctor or degree wheel it and get the specs just like what was done with the voodoo magic LG cams. I think you guys would come out looking much better if you all just divulged the specs to begin with and circumvent the backlash from being so secretive about the specs. Yall are providing phaser tables which no one else is so people are going to come to yall for that too over competing vvt offerings. Just been my observation over the years on the forums that companies who hide the specs get revealed and scrutinized moreso than the companies who lay it all out there. Yall are a good company and Ive done a lot of business with yall, I just hate when anyone is secretive about cam specs. Not everyone is comfotable with being taken out of the cam selection equation and just rolling proverbial dice on cam selection.

It costs 15 bucks for someone to get a cam run through the cam doctor...

 

There is much more to those cams than just intake and exhaust duration, LSA and intake centerline though. And we had the "privilege" of helping Comp setup their QC so they could do it and therein consistently cut our VVT cams....

Before Comp got that QC figured out, we were receiving cams off by more than 10º, which on a VVT combo is potentially even worse than a traditional cam! If they (Comp) couldn't just CamDoctor it in their QC department, 99% of the people out there with CamDoctors won't be able to either.

 

Sorry for the delay! Here's the thread with the graph and info!

https://www.performancetrucks.net/fo...75#post4631775

 

Hi, do you have something like this for a 5.3 ? it's a 2110 LH8 motor.VVT