speedy55

Just picked up an escalade 6.2 with the variable valve timing. we are probably gonna put this in a rockcrawler but we cant decide what to do with the vvt system. we were told if you unplug it it will default to center position but we are interested in putting this technology to use to get the most out of this motor

Bo185

You can remove the VVT phase from the cam, take it out of the tune and basically make it an LS3. Or mastmotorsports.com has cams for the VVT. The VVT should work well at low speed and low RPM for rock crawling etc.

sroach20

iTrader: (31)

the vvt will limit your choice in cams.

SweetS10V8

iTrader: (4)

VVT is "having your cake and eating it too". People who just toss it without trying to understand its benefits aren't doing themselves any favors.

VVT allows you to not have to play the "give and take" game. You don't give up torque on the bottom end to make power on the top. VVT allow you to get the best low end, the best mid-range, and the best HP available because you the cam isn't locked. You get to move it constantly letting the engine always make optimal power!!

GM High Tech Performance just did and article using a Comp Cams VVT camshaft(cam, springs, phaser limiter ONLY) and gained 70HP and didn't loose anything, anywhere....That's ridiculous! Totally impossible without VVT! The engine makes 500hp and has a 222/236 camshaft with like .570-600 lift, I cant remember specs exactly, but its extremely tame.

http://www.gmhightechperformance.com...all/index.html




Now your limitation on camshafts is piston to valve clearance. Swap out pistons and a new world would open up.

Can you tell I wish I could have this for me???

Edit: Wow, I had a lot of spelling errors...I fixed it.

sroach20

iTrader: (31)

you can get 500hp on a 6.0 with a small cam and l92 heads easily. with a 6.2 500hp aint ****. what other vvt cams are on the market compared to the amount of choices you have for non vvt?

SweetS10V8

iTrader: (4)

Ahh.... 6.0s and 6.2L will make 500hp with the same effort, .060" on the bore really doesn't make the 6.2L some mythical powerhouse.

Your one of the typical "look at the peak numbers only" guys. That's why you cant understand the usefulness of VVT. Did you look at that graph?

Like I said, if you need more power or camshaft selection, its just a piston swap away from almost unlimited possibilities.

sroach20

iTrader: (31)

no, im the custom cam type of guy that thinks the cam should be tailored to what you want. its better than your type that looks at what someones graph did and wants an off the shelf cam thinking its going to do the same thing.

SweetS10V8

iTrader: (4)

OK, take a 6.2L non VVT engine and spec me a cam that gains 70hp and doesnt lose any torque anywhere. Think even Patrick G could do it?

Copying a proven combination is a great way to ensure great results, someone else did the R&D work for you!

sroach20

iTrader: (31)

how many vvt cams are there?

SweetS10V8

iTrader: (4)

There are a few companies making them, Comp has like 3-4. They obviously work!

For the third time, the limitation is the piston to valve clearance.

sroach20

iTrader: (31)

if you want low end then the vvt is good, but it sucks at higher rpms.

Patrick G

iTrader: (14)

Not a true statement. VVT is a godsend when you want to have your cake and eat it too. Think about it...you can have the cam advanced for robust low end torque, then retard it for extended top-end. It's the best of both worlds. The top-end potential is much greater with VVT. Anyone who tells you otherwise hasn't checked it out.

Comp has some VVT limiter kits that will keep you from risking P to V contact. They are worth getting. I can spec a VVT cam or you can buy one from Comp.

Robin L

Hmm, let me look at some dyno numbers and get back to you on that

Really the LS3 and L92 respond very well to a good cam. The VVT will let you have the bottom and a little cake to eat at the top. It's not as dramatic as some say IMO but it's worth the effort.

Remember you have to use the truck water pump because of the different cam cover. If your going to use it on an engine with the car intake you will need an electric water pump and spacers. Then you need to figure out how to turn your other components.

Robin

Ragtop 99

iTrader: (7)

I'm with you a bit. That cam swap wasn't the most dramatic gain especially given that it wasn't a small bumpstick. That said, it looks like that cam will pull to 7000 with a very high average HP from 5900 - 6900 rpm. If the below 2000 rpm drivability is improved with the VVT, that's a benefit.
Patrick:
Can you pick and choose either lobes and or specs from comp?
Does HPT or EFI live allow you to adjust the phaser as to when it kicks in and how much advance/retard you can use?
The more choice in those areas the more awesome the VVT cam swaps will become.

sroach20

iTrader: (31)

i saw this:
https://ls1tech.com/forums/generatio...nce-gains.html
is it the intake that makes them go dead even over 5500 rpms?

Patrick G

iTrader: (14)

Yes, as long as you use the 156-000-13 single bolt VVT cam core.

Yes, in fact the function is so cool, I almost traded in my 2007 Suburban with the 5.3L to get a newer SUV with the 6.2L with VVT just to be able to make the adjustments with EFI Live. With just some tweaks in the cam phasing table, you can gain 60 lb ft of torque at lower rpm! Sooo awesome.

speedy55

Im thinking the factory cam would be fine for us . we are trying to figure out a controller for the VVT system so we can enjoy the benefits of this system.It's probably gonna be a propane burning engine with a carb intake on it. Does anyone have a stand alone controller for the VVT? we are gonna use the MSD for ignition timing control.

MastMotorsports

We have the only stand alone controller that does VVT to my knowledge. We also have camshafts for VVT and fixed cam applications. You will want to keep it for your off road application.

It improves volumetric efficiency across operating points of the engine that are normally compromised by a traditional fixed camshaft. I recently got to opportunity to make a comparison of VVT to fixed cam in a vehicle, not just on the dyno. The results in vehicle performance and driveability were astounding. The cars weren't even in the same ballpark outside the operating range of the camshaft. This reinforced my belief that eliminating the VVT is sacrificing "free" power(and driveability as well).

I am happy to see that more and more people are catching on to this technology...it didn't take long. I posted the data in the link above almost two years ago about the benefits of VVT and I am still hearing fewer and fewer naysayers and more and more believers by the day.

That said...I am a fan of VVT and think it should be kept in 95% of applications.

Good luck with your project and I hope this helps!!!

HeadDown

iTrader: (1)

I'm totally on board with the VVT. Now, how do I adapt the system to my stock'ish LS1?

nycblazer

I love this VVT stuff, I got my 6.2L VVT motor sitting inside my 4 door Chevy S10 Blazer with a t56 Viper Spec tranny for 2 years already, and now this VVT STUFF is catching up. THANK GOD!!!
Now I'm just waiting for some prices to go down a little bit, or even better yet a sponser.