What is the difference in rear wheel power and torque between a 03 HO, 04 and 05 ? (305/555, 325/600 and 325/610) ? I've tried searching for this information, but the search engine doesn't allow terms like HO, 55, 600, etc. due to their length.

Someone said that the 600 and 610 only output full power when the fan is on. Is that true or is that power available all the time ?

BTW: which engines have the ECM controlled fans and which one doesn't ?

Thanks.

 

If I remember correctly, factory specs are flywheel ratings. Most people that dyno their trucks do so after a mod but not as a stocker. A search on dyno may produce some info but like I said it will be with mods.

 

I am not sure but I remember that with an Auto, you minus about 20 % to get the rear wheel horsepower from the flywheel horsepower. Not sure if it is the same for a standard.

I would like to learn more about getting full power at what time?

I hear that if the motor sees that it is not pulling a load, it will not give full power? Is that true? Put the brakes on a little and it thinks it has a load, hence.. FULL POWER

 

Maximum HP is at 2900 RPM and full throttle with a load that does not allow the RPM to increase at anything but a slow rate. Anything more or less is not full power as the HP curve drops off above and below that point. Max torque is somewhere between 1400 and 1600 RPM and slowly drops off after that. The addition of chips, downloaders, etc will change the point of max power due to the change in programing. This engine in stock form has a very broad power band and that IMHO is the reason that it has been around for so long.

 

Check out this site for the info you're looking for:

http://www.tstproducts.com/index.asp...WPROD&ProdID=4

 

just by the seat of the pants feel, i can't tell much difference at all. i've had both and they both feel pretty much the same to me. my seat may not be very reliable though.

britt

 

"Check out this site for the info you're looking for:
http://www.tstproducts.com/index.as...OD&ProdID=4"

That is pretty much what I am looking for. I wonder if it makes much of a difference if the truck has an auto or a manual ?

Just for fun, does anyone have similar numbers for a 6.0 Ford or a Duramax ?

I think it is pretty impressive that the 325s are putting down nearly 300HP.

 

Summary: Toughest Standards Comments

Solution:

Thanks for your Email message.

The new 325 610 ft-lb torque rating occurs whenever the a/c and fan are both operating. There should be no difference in the normal operating RPM range of the engine, except at peak torque when the engine is under load.

There is no performance change and we doubt that the 10 ft-lb. difference could be felt by the operator. The new calibration is designed to improve white smoke at low coolant temp, misfire and slight mpg improvement, depending on the truck configuration.

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Comments:
what is the difference between the 325/600 engine and the 325/610 engine .as i have a 2004.5 dodge with the 325/600 any info. will be appreciated
thanks Grant

 

"The new 325 610 ft-lb torque rating occurs whenever the a/c and fan are both operating. There should be no difference in the normal operating RPM range of the engine, except at peak torque when the engine is under load.

There is no performance change and we doubt that the 10 ft-lb. difference could be felt by the operator. The new calibration is designed to improve white smoke at low coolant temp, misfire and slight mpg improvement, depending on the truck configuration."

Are they saying the extra 10 ft lbs applied when the fan and A/C are on or is it 45/55 ft lbs (600,610 - 555) that are applied when the fan and A/C are on ? 55 ftlbs x 2500 RPM = 26 HP.

I guess the dyno numbers from TST tell the story anyway. A stock 600 puts down 290HP to the rear wheels. If that is the case, the engine has to be making 325. Maybe the fan and A/C were on... but the fan draws 20+ HP itself when the truck is stationary on a dyno. I'm guessing the engine makes 600 ftlbs normally and 610 when the fan and A/C come on. At 2600 RPM, 10 fltbs is about 5 HP. Maybe that is what they figure it takes to run the fan when the truck is moving at 65 MPH.

I'd like to hear what they have to say the difference is between the 555 and the 600. One of us should email them ? Me ?

 

Superduty,

I am no expert, so don't hold this info against me...LOL. BUT, I think you may be confusing two different things. Please somebody correct me if im wrong....

It is my understanding that the 600 engine and the 610 engine are identical in every way....except the the newer 610 comes from the factory with the lastest software already in the ECM. When I got my 04.5 truck "reflashed" a few months ago with updated software, it became in effect...........a "610" engine instead of a lowly 600.

The 305/555 engine is a little different. It is common rail, but it does not meet 50 state emissions (ie. no cat) and may have some other differences in timing, software, and injection events.

Also, I thought I read or heard somewhere.....that the 600/610 engine holds back some of the power (stock) in order to protect the transmission.

 

Texas CTD is right.

although there really is no diff btwn 600 and 610. The engines were already
"centered" at 610 to be on the high side of the "spec". Each engine is a little different (+/- 5ft lbs) so whether you call it a 600 or 610 is arbitrary.

It was literally a marketing response to the Duramax going to 605 ft-lbs.

 

now lets wait to see ford's responce... i can see it now... 350hp, 650trq, warrenty void as soon as it leaves the lot

 

I dyno'ed mine as purely stock to get a good baseline to start from

275hp 508tq


mustang dyno loaded to 6,000#

 

"now lets wait to see ford's responce... i can see it now... 350hp, 650trq, warrenty void as soon as it leaves the lot"

The 6L has a plethora of problems at 325HP/560 ftlbs. Furthermore, they have to use EGR to meet emissions. I don't think there is any chance they are going to 350/650 any time soon. They have to get to 600 before they can get to 650.

People are talking about the 2007 being a 6.4L twin turbo setup. I don't know if anyone is noticing a trend, but IH engines are getting more and more gimicky with each model and reliability is decreasing while operating costs go through the roof. Ford still doesn't have a decent oil change interval. They can't keep one turbo running properly, let alone two. Have you looked under the hood of a Ford lately ? Firewall to rad full of wires, hoses, tubes and sensors.

Why do you guys think I am putting a ISBe in my Superduty instead of buying a new one ?

 

I do know of a guy who did that with his 95 F350 but he put in an 02 VP44 245hp engine and the nv5600. He loves it.