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Discussion Starter · #1 ·
Has anyone ever successfully done this or know how to get rid of our VVT? Because once this happens it means cams will become an option for those of us trying to push the limits of these lil 1.4s


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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.
 
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Discussion Starter · #3 ·
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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I think you'll have to tune around it. If the VVT became non-functional for any reason, the ECM would set a code. Since you'd need to modify the ECM code to ignore that, you might as well do the tune.
 
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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)

VVT can give you greater cylinder pressures at low rpms, or greater turbo spool depending on load.
High rpm it can once again give you higher and longer cylinder pressures, or give you quick spool depending on load.

Any tune will be extending the cam profiles to give you more of what you want when you want it. +45 lb-ft of torque and more boost with an aggressive cam tune. Slightly better economy when off the boost as well. +6 MPG overall, in my experience.
 

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Discussion Starter · #6 ·
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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Heads already have over-sized runners. If you want to push these things turn up the boost!
 
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-Forged pistons
-Bigger turbo
-Valve springs
-Bigger injectors
-E85?

Once you've done that and still want more, then you can look into cams - no one has found the need yet, and VVT can do some pretty cool stuff (that's why they went through the trouble of putting it there). Those mods will put a Cruze well into the 200 HP range.
 

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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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You're about 5 years too late for that. :p
 

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Discussion Starter · #10 ·
You're about 5 years too late for that. :p
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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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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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.
 

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Discussion Starter · #12 ·
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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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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You should start by talking with your personal GM tuner, because a good tune on your stock car can easily make an extra 25% more power and torque right off the bat. Otherwise you should get in touch with @jblackburn because he seems to know his stuff.http://www.cruzetalk.com/forum/5096-jblackburn.html
 

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You should start by talking with your personal GM tuner, because a good tune on your stock car can easily make an extra 25% more power and torque right off the bat. Otherwise you should get in touch with @jblackburn because he seems to know his stuff.
You can find Walker Morgan on Facebook in the Sonic groups. He would be the one to really get in touch with, as he's taken a Sonic over 300 HP [relatively] reliably.
 

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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.
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
 

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Discussion Starter · #16 ·
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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