VVT on LT1 when/how much
Thread Starter
Le Mans Master
Joined: Oct 2008
Posts: 5,712
Likes: 221
From: Irving, TX
VVT on LT1 when/how much
Hi, I did some searching both on the forum and using the google machine and can't seem to find an answer. Does anyone have the technicals on the VVT on the LT1.
I'm just trying to find out the stock cam specs, when and by how much the actuator advances and if drive mode affects it. This is more out of my curiosity and knowing about how the car reacts.
Any info or source for info is appreciated.
I'm just trying to find out the stock cam specs, when and by how much the actuator advances and if drive mode affects it. This is more out of my curiosity and knowing about how the car reacts.
Any info or source for info is appreciated.
Safety Car
Joined: Mar 2004
Posts: 4,048
Likes: 1,478
From: South Florida
You can tune the ECU to change the cam movement. I do it often on the LT1's. The biggest changes that can be made are part throttle drive-ability, which reduces fuel economy but makes part throttle feel way better. Your not going to find a bunch of hidden power or anything by trying to change the WOT cam movement on the stock cam.
Thread Starter
Le Mans Master
Joined: Oct 2008
Posts: 5,712
Likes: 221
From: Irving, TX
I was thinking maybe 10 degrees but truly had no clue. Last weekend i installed a soler TB and it makes whatever changeover which happens at 3k rpm seem much more pronounced. I can really tell at part throttle and low speeds. I have a manual so tend to let it wind out till about 3k or a little more driving around. I have also noticed that it seems to be common practice to lock out the phaser when doing a cam swap/AFM delete.
Instructor
Joined: Aug 2022
Posts: 163
Likes: 12
From: SEPA
You can tune the ECU to change the cam movement. I do it often on the LT1's. The biggest changes that can be made are part throttle drive-ability, which reduces fuel economy but makes part throttle feel way better. Your not going to find a bunch of hidden power or anything by trying to change the WOT cam movement on the stock cam.
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Safety Car
Joined: Mar 2004
Posts: 4,048
Likes: 1,478
From: South Florida
When you say part throttle feel way better, what exactly do you mean? I have a V225 VVT cam from BTR installed and the tuner didn't see a difference using their VVT so they said he set it back to 0. The cam has a 4 degree limiter in it. It's got a light but annoying surge from like 1800-2300 RPM at partial throttle that I saw someone else was experiecing due to VVT went as far as to switch the limiter out with a lockout. Is this due to the VVT?
i was referring to the stock cam, not an aftermarket cam. Most aftermarket cams don't move at all or only move at WOT so my comment here is irrelevant to your v225 Cam.
Aftermarket VVT Cams are mostly useless. They don't make more power. Lock the cam at zero movement and tune it. If you're car is surging with that cam then you could have some tune issues that are causing it. A cam that small should not surge.
Instructor
Joined: Aug 2022
Posts: 163
Likes: 12
From: SEPA
i was referring to the stock cam, not an aftermarket cam. Most aftermarket cams don't move at all or only move at WOT so my comment here is irrelevant to your v225 Cam.
Aftermarket VVT Cams are mostly useless. They don't make more power. Lock the cam at zero movement and tune it. If you're car is surging with that cam then you could have some tune issues that are causing it. A cam that small should not surge.
Aftermarket VVT Cams are mostly useless. They don't make more power. Lock the cam at zero movement and tune it. If you're car is surging with that cam then you could have some tune issues that are causing it. A cam that small should not surge.
Thread Starter
Le Mans Master
Joined: Oct 2008
Posts: 5,712
Likes: 221
From: Irving, TX
Good info, when the time comes, (hopefully next year) when I do a cam swap along with DOD delete and tune I'm definitely going with a lockout. I'll probably farm the work out on this one since I plan to keep this thing as my daily until I retire and get my old man ride.