LS4 section?
Thread Starter
Staging Lane
Joined: Nov 2005
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LS4 section? Hey,
I was just wondering if anyone had considered adding a section for the new LS4 engines? I get a feeling there will be a lot of them out there, half of the new Grand Prix orders last month were LS4s. And I'm sure I'm not the only one interested in modding them.
Just a suggestion.
I was just wondering if anyone had considered adding a section for the new LS4 engines? I get a feeling there will be a lot of them out there, half of the new Grand Prix orders last month were LS4s. And I'm sure I'm not the only one interested in modding them.
Just a suggestion.
TECH Veteran
Joined: Dec 2004
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From: Beaumont, TX
http://en.wikipedia.org/wiki/GM_LS1_engine#LS4
http://www.theautochannel.com/news/2...22/260427.html
The LS4 is a smaller 5.3 L version of the Generation IV block. Though it has the same displacement as the Vortec 5300 LH6, it differs in that it has an aluminum block rather than an iron one.
A version of this engine is adapted for transverse front wheel drive application, the first time a small-block family engine has been used in this manner. Displacement on Demand is also used. Output of this version is 303 hp (226 kW) and 323 ft·lbf (438 N·m).
Applications:
2006 Chevrolet Impala/Monte Carlo SS
2006 Pontiac Grand Prix GXP
A version of this engine is adapted for transverse front wheel drive application, the first time a small-block family engine has been used in this manner. Displacement on Demand is also used. Output of this version is 303 hp (226 kW) and 323 ft·lbf (438 N·m).
Applications:
2006 Chevrolet Impala/Monte Carlo SS
2006 Pontiac Grand Prix GXP
Marking the 50th anniversary of the legendary small-block, GM Powertrain will showcase its new 5.3L LS4 V-8 engine, which will debut in the 2006 Pontiac Grand Prix GXP. The 5.3L LS4 V-8 represents the first time that the small-block will be offered in a front-wheel-drive car.
The LS4 produces approximately 300 horsepower and 300 lb.-ft. of torque. It also incorporates Displacement on Demand technology (DOD), which helps the vehicle realize fuel economy gains of up to 12 percent in certain light-load driving conditions, such as highway cruising, by seamlessly alternating between eight- and four-cylinder operation.
When matched with the inherent smoothness and torque of the V-8 configuration, the LS4 delivers strong performance - 90 percent of torque is available between 1500 rpm and 5600 rpm - and surprising economy. It's a combination most competitors' V-6 offerings can't match.
The LS4 produces approximately 300 horsepower and 300 lb.-ft. of torque. It also incorporates Displacement on Demand technology (DOD), which helps the vehicle realize fuel economy gains of up to 12 percent in certain light-load driving conditions, such as highway cruising, by seamlessly alternating between eight- and four-cylinder operation.
When matched with the inherent smoothness and torque of the V-8 configuration, the LS4 delivers strong performance - 90 percent of torque is available between 1500 rpm and 5600 rpm - and surprising economy. It's a combination most competitors' V-6 offerings can't match.
TECH Veteran
Joined: Dec 2004
Posts: 4,012
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From: Beaumont, TX
Originally Posted by cyphur_traq
Yea....its just a 5.3L motor. No need for a new section.
Yea, didn't mean to permadelete it. Ooops. I tend to navigate the screen using the tab key and I guess I hit a key somewhere around there, accidentally selected to permadelete. 
Anyhow......I tried to edit my first post, but when that didn't work out I just posted up again. **** it. I'm tired and frustrated right now.
Anyhow......I tried to edit my first post, but when that didn't work out I just posted up again. **** it. I'm tired and frustrated right now.
TECH Veteran
Joined: Dec 2004
Posts: 4,012
Likes: 1
From: Beaumont, TX
Originally Posted by cyphur_traq
Yea, didn't mean to permadelete it. Ooops. I tend to navigate the screen using the tab key and I guess I hit a key somewhere around there, accidentally selected to permadelete.
Anyhow......I tried to edit my first post, but when that didn't work out I just posted up again. **** it. I'm tired and frustrated right now.
Anyhow......I tried to edit my first post, but when that didn't work out I just posted up again. **** it. I'm tired and frustrated right now.
Good thing it was just one of your own posts this time though 
Thread Starter
Staging Lane
Joined: Nov 2005
Posts: 68
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I guess I'm not sure what you're trying to say. Are you saying that we fit in with the 5.3 truck motors, or one of the other sections here?
Because of the slight shortening to make it fit in the FWD application, and the special camshaft profiles for the Displacement on Demand cylinders, none of the other LSx internals will work (that I know of). I'm hoping that I might be able to figure out if anything will transfer over.
The LS4 is not the same as the 5.3L truck engine. That article seems to imply that the only difference is that it's aluminum, but the differences between the LS4 and the 5.3L truck engine are just as significant as the differences between the LT1 and the LS1, even though both of those are 5.7L, or the differences between the LS2 and the 6.0L truck engine (LQ4/LQ9). The 5.3L truck motors are LM7/L59 or L33 motors. Virtually none of the mods for the 5.3 truck motors will work on the LS4. I just figured that adding an LS4 section would be a nice addition to the site, but obviously the decision isn't up to me.
Because of the slight shortening to make it fit in the FWD application, and the special camshaft profiles for the Displacement on Demand cylinders, none of the other LSx internals will work (that I know of). I'm hoping that I might be able to figure out if anything will transfer over.
The LS4 is not the same as the 5.3L truck engine. That article seems to imply that the only difference is that it's aluminum, but the differences between the LS4 and the 5.3L truck engine are just as significant as the differences between the LT1 and the LS1, even though both of those are 5.7L, or the differences between the LS2 and the 6.0L truck engine (LQ4/LQ9). The 5.3L truck motors are LM7/L59 or L33 motors. Virtually none of the mods for the 5.3 truck motors will work on the LS4. I just figured that adding an LS4 section would be a nice addition to the site, but obviously the decision isn't up to me.
Last edited by LS4 GXP; Nov 10, 2005 at 02:26 AM.
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Didn't read the article, but why does DoD alter the cam profiles? Whats the deal with that. I can understand that it would have an effect on the design of things, just curious.
If the demand for a section ever gets high enough, we'll definitely look into it. With your last post you started to give reasons why this motor is different and deserves a dedicated section. However, this isn't the only DoD engine. I think it would be wiser to create a DoD section as a whole to discuss them all.
Didn't read the article, but why does DoD alter the cam profiles? Whats the deal with that. I can understand that it would have an effect on the design of things, just curious.
If the demand for a section ever gets high enough, we'll definitely look into it. With your last post you started to give reasons why this motor is different and deserves a dedicated section. However, this isn't the only DoD engine. I think it would be wiser to create a DoD section as a whole to discuss them all.
Banned
Joined: Nov 2005
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As I understand it, the DOD in the GM motors is actually accomplished by collapsing the lifter and not by any kind of seperate lobe on the camshaft. I could be mistaken on that, however. Now the cam is definately shorter as the LS4 is designed shorter specifically for front wheel drive platforms. Several vendors are already working on cams for the motor and the aftermarket should be booming in no time.
Chris Green
Chris Green
This is moving the thread off topic I think, but in response to above, for 2006, the Lucerne is only getting the NA Series III 3800 or the good old fashioned FWD V8 Caddy Northstar. No LS4, I can voutch for that.
FWIW, all 8 plugs will continue to fire, regardless of whether the DoD is active or not. Don't know if the combustion event will wear the plugs that much faster than just sparking them in dead air. Interesting point tho.
Here's cam difference proof from the service manual:
Camshaft Lobe Lift - Intake - Non Displacement on Demand Cylinders
7.2 mm
0.283 in
Camshaft Lobe Lift - Intake - Displacement on Demand Cylinders
7.33 mm
0.289 in
Camshaft Lobe Lift - Exhaust - Non Displacement on Demand Cylinders
7.2 mm
0.283 in
Camshaft Lobe Lift - Exhaust - Displacement on Demand Cylinders
7.33 mm
0.289 in
Camshaft Lobe Lift - Intake - Non Displacement on Demand Cylinders
7.2 mm
0.283 in
Camshaft Lobe Lift - Intake - Displacement on Demand Cylinders
7.33 mm
0.289 in
Camshaft Lobe Lift - Exhaust - Non Displacement on Demand Cylinders
7.2 mm
0.283 in
Camshaft Lobe Lift - Exhaust - Displacement on Demand Cylinders
7.33 mm
0.289 in
Thread Starter
Staging Lane
Joined: Nov 2005
Posts: 68
Likes: 0
Some quick info about the LS4 and and DoD, thanks to www.fastfieros.com.
Fact Sheet on the Grand Prix 5.3L Displacement on Demand engine:
http://www.fastfieros.com/tech/5_3factpage.htm
DOD explained from the GM service information software ----- DOD 5.3 V8 in GXP Grand Prix:
http://www.fastfieros.com/tech/DOD5_3.htm
DOD oil path and lifter operations --- DOD 5.3 V8 GXP Grand Prix for 2005
http://www.fastfieros.com/tech/dod_oil_path.htm
Fact Sheet on the Grand Prix 5.3L Displacement on Demand engine:
http://www.fastfieros.com/tech/5_3factpage.htm
DOD explained from the GM service information software ----- DOD 5.3 V8 in GXP Grand Prix:
http://www.fastfieros.com/tech/DOD5_3.htm
DOD oil path and lifter operations --- DOD 5.3 V8 GXP Grand Prix for 2005
http://www.fastfieros.com/tech/dod_oil_path.htm
I WOULD LIKE AN LS4 SECTION i think they are different enough from older 5.3l motors they need one .. i mean they do have their own cams, heads, accesories(i think), and displacement on demand...not to mention a new block made of aluminum instead of iron.. its really a whole different beast or at least as different as one ls series motor is gonna be from another.. so heres my vote for it !
also why not try it out? if it dont get traffic then just merge it into an existing forum but id bet it would be pretty popular i got a few freinds with these motors that would be more intrested in this site if it had more spific information about the ls4 motor....
also why not try it out? if it dont get traffic then just merge it into an existing forum but id bet it would be pretty popular i got a few freinds with these motors that would be more intrested in this site if it had more spific information about the ls4 motor....