Big fan of a game, but I’ve found something I seem to struggle with…I like trying to design useful, compact, efficient, yet, decently peppy engines in Automation, usually older Japanese kei-class (550cc), current Japanese kei-class (660cc) and on up to 1.6L or so.
It could just be that I’m incompetent, but I seem to have a heck of a time getting higher hp figures without having the max torque usable only at a relatively high RPM…
For example, in my mainstay, current 660cc I-4 that I am developing, my K4I4NA engine, the max engine speed is 6800rpms…not too high, but high enough to be a decent small engine with high reliability. Ok, that’s fine. The power output for such a small engine is about 57.1hp at 6800rpms. Ok, THAT’S fine. Torque is 47.8ft-lbs at 4800rpms. BUT…I’d rather the torque come in a little lower to give the engine better driveability for the small amount of horsepower without having to rev the nuts off of it…say 3800-4200rpms instead…
No matter what I try, I can’t seem to lower the max torque to a lower RPM without sacrificing some horsepower. Is there an easy way to do this?
You will sacrifice some hp but you can usually tune it to be pretty close, the exhaust would be my first step. Restrict the exhaust a bit, go down a tick or two in size, and try a baffled muffler, that along with a cam under 50 should give you plenty of low end grunt.
Thanks for the tips! I had already figured out that playing with the cams had an impact, so I shall give that more of a try and play with the exhaust…what about with VVL?
I does for cost though, if you were trying to build for a kei car, they had pretty inexpensive engines, so I was thinking of cheaper tuning methods. one other way is spark advance it seems like a higher raises the peak power rpm so maybe dialing in more compression for a bit less spark.
Here’s a quick engine I made up, it’s got about 3 less hp at 6900 rpms, but 2 more torques at 3800rpms for 30 hours and less than $300, I didn’t know your stance on sliders so they are all 0. Have a poke around and see if anything is helpful for you. 0.7L 16V DOHCRev2.lua (44.6 KB)
