[SloCruze]

For starters, DoD isn't VVT. DoD (displacement on demand) was the old name for cylinder deactivation. To answer your question, any tuner can modify VVT functionality to support a more aggressive cam. You're going to need a tune for that modification regardless, so that's not going to be a specific problem you have to deal with separately.

Well I'm still new to the GM platform I'm a Ford and Mazda guy this is my first GM so sorry for poor terminology knowledge. Either way can we turn it off or I just have to find someone who can tune around it


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[SloCruze]

Alot of magic happens with VVT on our engines, disabling it will result in less power and economy.

Valve lift doesnt help much, its easier to turn up the boost then to make new cams.
Getting aftermarket pistons allows for a more aggressive scavenging cycle (aka faster turbo spool)

And it would run into restriction at the top end as it would be breathing awkwardly

Well I plan on having my cylinder head ported, like I wanna make this thing run like a beast and do things uncommon. Ya know be the poster child for the Cruze builds.


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[SloCruze]

You're about 5 years too late for that.

Yea but I don't see many Cruzes in the 300whp range and the heads and turbo really hold us back look at our cfm to a Ford Fiesta st. Their motor is .2 liters bigger than ours but can easily achieve 380hp with a simple tune and turbo upgrade. Their airflow and head design has to be good and if I can get ours as good as that then I'm doing something others haven't.


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[SloCruze]

A fiesta ST making 380 horsepower on nothing but a tune and turbo swap wont be long for this world.

Maybe I'm off base here, but I don't think you have realistic expectations. Nothing in a stock Cruze is designed to handle 300 whp reliably. You also seem a bit green in terms of performance modding based on your VVT comments. Unless you want to throw codes and live in limp mode, getting your PCM tuned properly is absolutely necessary for major modifications.

The tuning is the least of my issues to be perfectly honest. I have a personal GM tuner that helped write their coding and still help them with patents and will occasionally help GM engineers out. So tuning is the least of my worries. I just really need the hardware.


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[SloCruze]

Well i got the hardware and a tight build, sooo many tunes, and my biggest issue is accurately fueling over 22 psi.
8 bit MAP and Charge tube readings. With a pwm MAF sensor in play it will fuel correctly under load, but once i start shifting gears the ECU sh***s itself.

Still waiting on a clever tune, but trifecta gave me a tune that never worked after a day at the dyno.

Idealy to really push these things we would need a full aftermarket ECU

Well can't we get like a mega squirt or something to replace our ECU or contact ZZP for one because if they can do it for cobalt SS which are part of the ecotec family I assume they can do it for ours. Now I know have a custom ECU is gonna cost but it's worth it


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[SloCruze]

Haltech would likely be the best way to go

Any specific one from haltech


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[SloCruze]

Using this chart from haltech: http://www.haltech.com/wp-content/uploads/2017/03/0317_ECUchart_SinglePage.pdf
You would want the E1500, It seems to support all the sensors the Cruze has, and Throttle-by-wire.

$1,800 USD, Includes the Universal Wire harness: HT-150904 Elite 1500 (DBW) - 2.5m (8 ft) Premium Universal Wiring Harness Kit - Elite 1500 - Universal ECU Kits

Alright thanks


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