Torque curve

[89retta]

Does someone have a chart or know the torque curve of a 2004 4.3 gxi-e Volvo? Thanks for any info

 

[Bondo]

Ayuh,.... Why ya askin',..?? That's usually unpublished info,.....

Generally speakin', figure max torque from 2000 rpms to 4800 rpms,....

 

[89retta]

Don't know why Volvo wouldn't publish that info. I would like to see where the engine makes the most torque and hp. If the engine make the most in the upper rpm range I would like to see if the ecm can be reprogramed to get the most in the 2500-3500 rpm range.

 

[bruceb58]

Don't know why Volvo wouldn't publish that info. I would like to see where the engine makes the most torque and hp. If the engine make the most in the upper rpm range I would like to see if the ecm can be reprogramed to get the most in the 2500-3500 rpm range.

ECM has nothing to do with where the engine makes it's power.

 

[Tail_Gunner]

Volumes have been written about this subject it is pretty much the same every time. In short both volvo and merc have the 4.3 strung out pretty good they both run the engine fairly rich to keep things safe and dependable. As of today there is no dependable way to place oxygen sensors in the wet exhaust system and keep the sensors alive they do not like water. One can fine tune the system to the ragged edge but that is both expensive and dangerous for the engine with very little gain...actually with the cost of new engine's lately its probably cheaper to simply bolt on a 5.7

I have been tempted to try this little toy http://www.dynojetcmd.com/cmd_marine_details.aspx just to many other cosmetic tinkering to do it never end's opps to the original question the marine 4.3 run out of steam so to speak at about 4500 rpm by design... the cam in the engine has very little if any overlap.

 

[89retta]

ECM has nothing to do with where the engine makes it's power.

The ECM has lots to do where the engine makes its power. It controls the air/fuel mixture, timing and other variables. Why do you think they sell programmers for cars and trucks. Super chips, bully dog are a few companies. They reprogram the ECM.

 

[Tail_Gunner]

The ECM has lots to do where the engine makes its power. It controls the air/fuel mixture, timing and other variables. Why do you think they sell programmers for cars and trucks. Super chips, bully dog are a few companies. They reprogram the ECM.

No OS sensors in marine app's they use speed density high load's and very rich afr's to keep thing's cool so to speak...Think about this for a while very cold block very hot piston's

 

[Scott Danforth]

GM Powertrain publishes the torqe curves for the base engines. However they currently have the 2016 engines on the website.

However as pointed out. Boats aint cars. Boat engines are already fueled more than a car engine to keep the pistons cool. to get more out of them, you are into forced induction or bigger displacement. Not much more to be had from the stock motor than what is currently coming out of it

 

[bruceb58]

The ECM has lots to do where the engine makes its power. It controls the air/fuel mixture, timing and other variables. Why do you think they sell programmers for cars and trucks. Super chips, bully dog are a few companies. They reprogram the ECM.

You might be able to slightly increase power across the curve but you aren't changing the shape of the curve one bit. You aren't going to move the peak torque to a lower RPM if that is what you have in mind.