Tell me about Volvos

Yea you can. Turn the engine back as far as you can, then adjust the computer reading on the TPS to never read above a certain percentage. It can be done.

 

Not a C-15 you cant, the lowest you can do is 435 with the small injectors. You need to learn a thing or two about fuel, timing, and boost before you start saying this kind of crap, there is way to much injector in a 600hp C15 to cut it back to 375hp, thats not even a CAT rating, timing is a whole different story..... Oh and please dont say you drove a 600hp cat because it says so on the oil cooler, that means 600hp MAX doesent mean thats what the engine is, or ever was set to.

 

I would really do some more research into turning up an engine before actually doing it. Lots of people are stuck on the Tim Allen phrase "More Power, ah...aharg...grunt grunt more power" and they have no idea why they want more power. Well they think they do at least.

I don't know the specifics involved in turning up a diesel engines HP. But nothign new is added to the engine as far as I know...they just hook it up to the computer and raise the HP it can produce. However...how does the engine produce more power?

Also, most truck companies recommend Setting the HP down because you don't always need the 2k HP.

There is a reason that there is a sweet spot for RPM range...because that is where the truck gets its best fuel economy. Speed, RPM range...etc are all factors that add up to good fuel economy. Same thing for HP. The engine is just the tip of the iceburg when it comes to power. what gear ratios do you have, what tires, what kind of trans...etc. There are a bunch of factors that add up to fuel mileage. In the end, a higher HP engine results in more maintenance as it has a shorter lifespan.

 

Research is a good thing.

May be true. But I'm thinkin' there must be lots of people who DO know why they want to turn the HP up.

Here's where that "research" you were talkin' 'bout comes in.

2000 horse power?!
A BIG HP engine can produce in excess of 2000 pounds feet of torque, but 2000 HP isn't likely. Better get on that researching.

Pretty big tip of the iceberg though. 'Gear fast -- Run slow.' Ever heard that? High rear gear ratio for lower RPM at speed,........ but if the engine doesn't have the HP or torque to turn a high gear ratio, you're defeating the purpose.

SaY WHAT?!!!
Have you researched the subject to come up with those claims, or are you just giving us your opinion(s)?

Are you driving one of those "higher HP" engines? Do you have experience with them?
Or, are you just repeating what you've heard others say? And, did THEY have experience with the higher HP engines?

It's always a good idea to research your sources to validate their credibility.

 

lol I thought by using 2k HP, youd sense the sarcasm....apparently not.

Well...no I just pulled it out of a hat.

""
Choosing the wrong engine can also nullify a transmission's ability to save fuel, adds Mitch Murray, manager of tactical marketing for Allison Transmission. “Too often we get all revved up about horsepower and torque, forgetting that what's under the hood may not be getting to the wheels,” he says. “Buyers end up purchasing way too much engine for the operating ranges their trucks are in 90% of the time. That's a waste of horsepower, fuel and purchase price money.”"

Kenworth:
Select the right engine and gearing for the intended operation:
Engine power settings have unique torque, horsepower, and fuel-consumption
curves. Selecting an engine with excessive power can lead to inefficiencies.

etc.
IF higher HP engines resulted in LESS maintenance and better fuel economy, the umpteen thousand truck fleets out there that run this country daily with thousands of trucks would have them...instead of what they do have which is lower HP engines. Theres GOTTA be a reason the national truck companies are buying lower HP engines. ANd don't say its cost...because spending a bit extra for a higher HP engine that supposedly would save on fuel would result in tremendous savings over the trucks lifetime, making the cost worth it.

 

Apparently I didn't.

Many people do that, ergo I questioned your comments.

""

There ARE companies that purchase bigger horsepower engines and have them turned down to a lower rated HP.
Reasons?
Because many company drivers would abuse the additional HP and torque -- causing additional maintenance costs.
And,
For the resale value.
The engines are often turned back UP to increase their worth.

IMO, under the right, right foot, big HP and torque is not more costly -- maintenance wise.

 

The umpteen thousand truck companies you speak of have to dumb everything down to the lowest common denomenator for the swifty. cr england crowd. More power and efficiency will result in lower mileage and more wear and tear if put into the wrong hands. You give a guy 800hp and he never takes his foot out of it and has it mashed on every hill then it will suck fuel. When you compare fuel milage of a high hp motor and a low hp motor you have to adjust it to make all other variables the same. increasing efficiency will always increase fuel mileage but only when looked at the same hp rating.
So say your big cat has 350 hp. You increase the power to 45 by increasing the efficiency of the motor. So when you take that 450 hp motor it will get better fuel mileage at 350hp then it did when it was SET to 350. however it will get less at 450hp. hp costs fuel to make it. That's where the gear fast run slow saying comes from

 

Thank Yew, M-Man!

 

Yes you can turn them lower, and as a ASE certified mechanic, I know this for a FACT. With the computer systems on these trucks, and cars, you can pretty much get them to do anything, except drive themselves. But as we all know, they are working on that one too. Cut the boost back, trim the fuel pulse to bare minimum, I have driven a 600 HP cat, Drove one today matter o fact. Maybe you should learn a thing or two about the people you are talking about befor you make yourself look like a fool. I never said it was a cat rating. However, when the truck had broke something, under warenty, they dynoed it. The tech came to me with the sheet, and showed me the max HP was indeed 375 (378 to be exact). My company didnt like the fact that CAT voided the warenty on the spot. I didnt care, wasnt my truck.

 

LMAO!!!! So your a certified mechanic? You cannot set a electronic cat to anything else other than what cat programs it to..... Shows your inteligence if you think 375whp is 375 crank hp, now you look like a fool, how about you add about 15% to that, you think engine manufacturers rate their engines at the wheels? Go drive your I shift volvo because you dont know me, you dont know what i have, and you dont know how ive done it. Caterpillar ecm's are so password protected you cant even get in there to set injector trim codes in them now a days, and here you are talking of "custom" programing..... trim the fuel pulse eh? Go ahead, with a injector thats made to operate at a certain pulse and fuel psi level, lower it enough and it will run like ####..... This is why i dont go to any mechanics.... Last time i had a ASE tech tell me the reason why ISX has coolant going to the turbo is to spool them up faster, i looked at him and told him hes an idiot and needs to quit his job if thats why he thinks that.