Roadrunner 45

iTrader: (1)

Any vendors have a cam setup for this yet? She's got 700 miles on her and I'm dying to make some real power. I'm guessin that with a fairly mild cam and a good tune 360-380 RWHP should be no problem.

Frans96SS

iTrader: (15)

My RPM-2 cam should make Great power and torque in that car. Feel free to give me a call if you would like a cam.

racerns

Being a DOD engine is it possible to change the cam and keep the DOD? If not, what other special changes need to be done with a cam swap (lifters and such)?

Mr. Sandog

No.

Yes - lifters and such.

Slayn

What mods can be done and keep DOD? Theres not much above intake or exhaust is there?

ringram

Why not?

Surely its just a case of tuning it correctly!?

325trooper

iTrader: (2)

A DOD camshaft is grinded with different profile.

Roadrunner 45

iTrader: (1)

So what all do I need exactly? From what I've read, the G8 cam uses a different sprocket than the f-bods so the end of the cam is different (g8 specific cam), I guess lifters are needed, pushrods, and springs. Does the DOD need to be tuned out prior to the swap to prevent damage? Anything else "special" compared to an F-bod? I really don't care to keep the DOD, I just don't want to screw anything up.

Semper91-RS

You would save money just doing lifters. Us guys in the 5.3 DOD section have the same issue. Cams are going to be hard to come by, unless you don't care about losing your DOD. Lifters however, and a new intake, will most likely give you a similar result.

tCTech

iTrader: (2)

Well I feel retarded asking this question, since I'm also retarded at searching at can't seem to find what I'm looking for.

What's DOD stand for?

ringram

Custom grind then!?

DOD = Displacement On Demand (Basically cylinder deactivation, runs as a 4 banger when off load)

tCTech

iTrader: (2)

HAHAHA Of course, I checked it on google after I posted and it showed up. Even when I saw it I felt dumb for posting that question. I've seen that before, just didn't ring a bell.

Thanks ringram. Everything makes sense to me now.

As far as losing DOD, I'm not too worried about it. Is having this function required by some kind of law? Or do we absolutely need to regrind or buy new lifters and such?

Morpheus

iTrader: (7)

It's not just tuning. The GM active fuel management engines use a specially designed lifter that locks into place when AFM is activated.

Here's the lifter.


And a diagram.

Slayn

So I am confused, what does this mean, that modding is limited if you want to keep DOD? How limited are we talking about? Does DOD even do anything?

tCTech

iTrader: (2)

It supposedly improves your fuel economy when it deactivates 4 cylinders. Leaving you running as if you had a 4 banger instead of the massive V8. Basically, it's there to so you don't have to pay gas hog taxes when purchasing a vehicle, and so whoever creates those dumb standards, are satisfied. Keeps the vehicle from being scrapped because of those green leaf *****.

Semper91-RS

While that is essentially how most of us FEEL, that is not what it DOES. It cuts 4 cylinders under light load (Such as highway cruising), and when driving at low speeds, such as 1/3rd throttle and the like. It's really not such a bad thing, and it does work.. As long as you put your car in Drive, it'll be active. IN Manual mode, it's not active. So enjoy your shifting!

Roadrunner 45

iTrader: (1)

I don't care AT ALL if I lose DOD. As a matter of fact, I prefer NOT to have DOD. I don't like it, just my personal preference. So it sounds like the bitch is that the easy LS series cam swap doesn't apply here- I've gotta spend extra jing on lifters and pull the manifold too.

Unless... it looks like in the picture that when DOD is active, the pushrod is allowed to extend into the lifter body. What if the lifters were disassembeled the lifters and you made up some plugs (titanium or tool steel) that would keep the lifter from compressing as it would in the DOD state? I guess the trick would be making a plug that would stop DOD, but still allow the lifter to behave as a hydraulic lifter- I have no idea if the lifter design would allow for this. Does anyone know how much travel a standard lifter body allows VS. what an "activated" DOD lifter allows or if this has been done? I know that this is a stretch as aftermarket lifters aren't a fortune and any plugs would need some real engineering to work (likely require metered oil passages to allow the lifters to still pump up normally). This just got me wondering if this is theoretically possible.

Not that this matters at this point, but lets say I pitch the DOD lifters and replace with a "standard" lifter. What happens if you drive the car without the DOD lifters, but DOD has not been disabled in the tune (as I drive the car to get her tuned)? Will anything get messed up?

88ls1blazer

iTrader: (1)

Parts needed to do the cam swap:

Camshaft designed for a 6.0 w/ l92 heads (I would run the livernois stage 1 l92)

LS7 lifters

LS2 lifter buckets

Pushrods

Upgraded valve springs (I, once again, usually use the Livernois dual kit)

LS7 cam sprocket (or a billet JP performance ls7 single row chain)

Tuning

someone fill in the gaps if I forgot anything, But that should be it...

ludicrist2500hd

Yes working on that now

from GM tps for DOD on is under 6% TPS , I have gained 4-5 mpg hwy 27-28 mpg at 80 mph from setting this to 11% .

If you want to get rid of the DOD then yes. IMO the car needs headers before the Cam . Think early 90's log manifold from a truck .

ringram

Yeah except thats already in there, so with a new DOD cam it IS just a case of tuning it to suit.