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IKR, lol. I will say this - stay away from SiliconSolutions! IIRC, I was only putting out 44psi in that video, and we never recommend going higher than 35psi on an HX35, because they can grenade. But you know as well as I do....part of the fun is fixing them.
Don't feel bad. I haven't even started that truck in a year and a half. After eating, drinking, and sleeping Cummins for so long, I just got bored, I guess. Now that truck is parked, I drive a stock Duramax, and I put EFI Live on my wife's Duramax. Times sure change.
Know a fella that runs a suvey team for a Shell subsidiary. Drives all over the middile of nowhere all over Texas, New Mexico, and parts of Norther Mexico.
He put 160k+ miles on a duramax in about 5 years time. Spent like around two grand keeping it well maintained.
All the PACCAR MX13 and the Cummins ISX12 and ISX15 engines use a single variable geometery turbocharger. In fact, The only NA cummins engine that I know of thats currently in production that runs multiple turbos is the new ISV.
As far as the torque ratings on the engines goes, they seem to have them numerically correct in the game. I'm not sure how good their physics engine is though. With that said, these vehicles feel very similar to their real life counterparts.
The PACCAR MX13 is rated at 1850 FT/Lbs of torque at 1100 RPM. The Cummins ISX12 is rated at 1650 FT/Lbs of torque at 1150 RPM. The cummins ISX15 has 2050 FT/Lbs of torque at 1450 RPM. The MX13 also weighs less than the ISX12 does. If it's a decision between the ISX12 and the MX13, I'd choose the MX13. If its a decision between the MX13 and the ISX15, I'd choose the ISX15 (In-game).
As far as transmissions goes, If you think a 6 speed is better for these engines than an 18 speed, you simply do not know how to drive these tractors. Especially in these modern engines, the torque curve is very low, with the peak torque being much lower than the older diesels. It is crucial to keep these vehicles at peak torque for not only pulling power but also fuel economy. This is where an 18 speed transmission comes in handy.
I don't have many hours in the game however I work on these every day.
By "a lower level" I'm assuming that you mean cheaper? If thats what you mean then you're wrong. The PACCAR engine is actually cheaper to purchase in a truck in real life because PACCAR offers discounts to Peterbilt and Kenworth where Cummins does not. It's cheaper for a dealership to buy an engine from PACCAR than it is to buy one from cummins. PACCAR did this for a few reasons, the biggest being that they are a new competitor in the NA truck market and are trying to gain a lot of marketshare very quickly by selling a reliable, fuel efficient, powerful engine for an affordable price.
Engines don't make hp, just torque. Hp is a measurement. If you look at the engines the Cummins peak torque is at 1,200rpm while the Paccar hits peak torque at 900rpm or 1,000rpm for the higher engines. That 6speed auto has long gears so you shift below peak torque with the Cummins(hence it not being as good as the 18spd which is shorter gears so less rpm drop) but with the Paccar the 6speed drops rpm right into peak torque range on the Paccar maybe slightly above, this is why it performs better with that engine.
So you have proof of this??
Wow, I never expected to read this on Steam. I guess that makes about ten of us in the world that understand that.
For the layman:
People think torque is all that matters. That would be true, if gearboxes didn't exist. But they do. So you can take an engine with half as much torque, but twice as many RPM, and they will perform the same when they get to the same HP level. Torque doesn't really give you much info. If an engine has a lot of torque, that's great. But is the engine useful? Well if it's a water wheel generating 2400 lbs torque, but it only turns 6 RPM, it can't really do much work. It has a lot of torque, but effectively has very little horsepower.
For another analogy: Two men are moving dirt with a wheelbarrow. The first guy is very strong. He can move an entire wheelbarrow of dirt from point A to point B in one minute. (lots of torque, but low RPM) The second guy isn't as strong, but he is fast. He can move only half a wheelbarrow of dirt at a time, but he can move it from point A to point B in 30 seconds. (only half as much torque, but twice as many RPM) In the end, they both get the same amount of work done.
Torque is the measurement of rotational force. Horsepower is the measurement of work done over time. What it boils down to is simple: Horsepower is the only number that really matters at the end of the day. It is the measurement of what the engine can actually accomplish.
This is not taking into account the lower RPM of a big diesel engine helping lower maintenance costs in real life. I'm just talking about engine to engine getting work done...horsepower is the only number that matters. A 6.7 liter Cummins with 400 hp, and 850 tq will be able to do the same job as a 12 liter Cummins with 400 hp, and 1300 tq, as long as it has the gearing to take advantage of the smaller engine's higher RPM. The little guy won't last as long, but he will hang with the big guy while he's in the ring.
So no, in your example above, an engine producing 850 ft/lbs will not do the same amount of work as an engine producing 1300 ft/lbs because they both have the same HP #; the 850 ft/lb engine will only produce that as a maximum amount of torque ever, regardless of RPM. The lower torque engine is incapable or performing the same amount of work as the 1300 one regardless of gearing. If all that is required to operate at speed "x" is a max of 850 fl/lbs, they will both be capable of performing at that level but they will not perform comparably once that threshold requirement is exceeded as one engine simply cannot.
HP is a marketing number as it was discovered in the 60's during the horsepower wars of the muscle car era that people are very ignorant on this topic and bigger must be better....the trend has continued.
LOL, you clearly don't understand the subject, or you didn't read my post. If torque stays constant, any increase in RPM will have an increase in horsepower. An 850 tq engine can output the same amount of horsepower as a 1300 tq engine, as long as the first one can output enough RPM. Peak hp and tq are usually measured at different RPM. For example, an engine might have 800 tq at 1400 RPM, and 400 hp at 1900 RPM. The engine will be advertised as having 400hp, and 800 tq. At 1900 RPM with 400 hp, it might only be outputting 700 tq at that point, but the RPM will up the HP number in the calculation.
The equation to figure out HP is no secret. It's also why any legit dyno chart will have the same amount of HP and TQ at 5252 RPM. After that RPM, HP will always be higher than torque. Below that RPM, torque will always be higher than HP.
You say that an engine with 850 lbs tq will only ever produce 850 lbs tq. You seem to forget that engines are generally mated to a transmission......... So yeah, you can output a variable amount of power to the tires. The big engine might output 400HP at 1800 RPM, and the little one might do it at 2200 RPM. But you gear the truck a certain way. You might haul your load in a semi down the interstate at 1600 rpm, but the small Cummins will haul the same load, but maybe be at a higher RPM. You yourself posted the equation. You shouldn't do that, if you don't understand what it means.
Take two semis. Pull the engine out of one, and replace it with a smaller, but higher revving diesel. Leave the drivetrain alone. The stock semi will go down the interstate in tenth gear at 1600 RPM. The modified one will go down the interstate at the same speed, with the same load, but he's in ninth gear at 2300 RPM. They are doing the same amount of work. The little engine is weaker, so it compensates with lower gears, and higher RPM. They are both capable of doing the same amount of work, even though the little engine has less torque. And we all know HP is a measurement of work done over time.