I know that the developers are in too late to put another engine, or so they think, into a vehicle that is already ingame. But seriously, an I6 in a semi? I think that that is absurd! In the 70's, they didn't put little I6ers into trucks! They put at least V8's. The T-series is terribly slow compared to other 70's diesel's. The only I6 Diesel from the 70's were light duty Dodge pickups from 78-79. I mean, at least put a V8. Big Rigs should have big engines. They need them. And put a trailer onto it! That is one of the only uses for a big truck like that! Who's with me?
you realise that yes, MASSIVE i6 diesels like the one in the T Series were common. Christ... That things 10l or so, not a little 2l i4 out of a car.
That was "Sarcasm" But honestly, even though it is unrealistic, not even a notable priority for the Devs, and pretty pointless, a 20L V12 in the T series would be cool.
So, the devs work hard to have the most realistic game possible and they put a 20L V12 engine onto a truck? it seems ridiculous, the diesel i6 is the most common engine.
Why stop at a 20L v12? why not stick two together horizontally for a 20 I12 then stick four of those together for a 80L quad turbo X48? And maybe some rockets on the side... In all seriousness do you honestly think a 20L V12 would fit?
Nearly all semi trucks from that time and even now have straight six turbodiesels. They're slow off the line with only about 300 horsepower, but they make 1500 lb-ft of torque. You say the T75 is slow, but moves at the same speed even after several tonnes of weight have been added. A V12 or even V8 that produces enough torque to haul loads would be so ridiculously huge it wouldn't fit inside the huge engine compartment. So no, it's not going to get a V12.
Oh dear. Here's an idea, don't try to improve things you know nothing about. I will concede the T-series feels rather under powered, I forget what it is "supposed" to have, but it feels like it may only be 9 or 10 liters. You say the only I-6 diesel in the 70's was in a light duty Dodge truck? So you mean the atrocious little Mitsubishi diesel? Let me introduce you to the 1693 Caterpillar, The infamous 3406 CAT, the 855 Cummins, the Monstrous KTA 600 Cummins. With both Cat's being 14.6 Liters, and both Cummins's being 14.0. Yes, there were the Cat 3408 V8, the Mack E9 V8, and Detroit 8V71 and 8V92 V8's, While there were a fair few of the Detroits out there, the I-6's still outnumbered them. But both Detroits were fairly small displacement, at 9.3 liters, and 12.0 respectably. However, the 3408 was massive, at 18 liters, And the E9 was fairly large as well, at 16.3. And, yes there was the Detroit 12V71 V12, And yes again, it was a fairly impressive thing, but it was no bigger than the 6's, only 13.9 liters. There was the 12V92, But to my knowledge it was never in any road going trucks. Even the the two-stroke Detroits weren't terribly reliable, they sure sounded amazing.
Allow me to sum up what I think this thread has resolved: Normal semi trucks do not typically have V12s, thus a V12 T-series is unrealistic. This idea is about as logical as the Giant flail, decent for a mod, but not so good for official content.
In a nutshell, I agree that it is under powered. However a V12 isn't necessarily the right way to fix it.
The truck I'm currently sitting in has a Detroit Diesel DD15 engine. Straight six, turbocharged and intercooled, 14.8L and 440hp. 2016 Freightliner Cascadia Evolution. Straight six engines have been common since the seventies, and still are.
10.6L diesel, with a fairly small turbo - according to the wiki. It's a bit slow even for trucks at the time but it's not unrealistically lethargic.
I don't know of any trucks with V12s in them (apart from possibly ludicrously overpowered one offs), In Europe nowerdays it's all Euro6 efficiency turbocharged I6 engines. The top of the line models are V8s, although those are quite weak and get their power from the turbos now as well.
I'm gonna heat this up a little: Current gen Volvo FH16, 16l twin-turbo V12 diesel, 750hp. It has around 3500Nm. The Scanias of the same power range (and any other truck with that power really) have V8s though.