- Joined
- Jul 30, 2012
- Posts
- 3,238
- Reaction score
- 5,359
- Location
- Newport News, VA
- Ram Year
- 2012 1500 Laramie CC 4x4
- Engine
- 5.7 Hemi
Thing is, it didn’t “lug” the engine at all. That’s exactly the point I was trying to make. The older engines made their peek power much lower in the rpm range, and didn’t need to spin up to 6k just to pass someone.
Perfect example of this is the 4.0 (I6) vs the 3.8(V6). They are similar in displacement and peek output, but the 3.8 has to rev much higher to make those peek numbers.
This lead to a lot of people feeling like the 3.8 was under powered or “doggy” because they were used to the 4.0 having its torque so low in the rpm range.
My current truck for example (2012,5.7,6speed) is no slouch, however, it pulls considerably harder above 3000rpm.
Example: rolling start, hit the gas, it down shifts and pulls ok. But once it hits 3K, you can feel it come alive.
While the engine in my old truck did make slightly less peek power(350 vs the hemi’s ~400), it hit those peek numbers much lower in the rpm range. It was “all in” under 3500rpm, which is where the hemi is just starting to come alive.
It is a completely different driving experience, and one that I sometimes miss.
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1) comparing the 4.0 inline 6 to a 3.8 V6 is a lousy comparison, peak output or not...an inline engine with the same numbers of cylinders will almost always have more torque than a V configuration
2) unless you built it, I doubt your 360 had 350 hp, and trust me, it likely did lug the motor, you just didn't realize it. As a general rule, you burn more fuel making power at low rpm like you want, than you do making it at higher rpm like the hemi is designed to do. Also, it probably had better gearing which helped it seem to have more power now, as todays trucks are geared for mpg, not power. Why do you think towing packages have better gearing.....to let the engine spin up and make more power when needed easier.
3) the reason your hemi comes on strong after 3000 rpm is it is designed to do that....at that rpm, the variable valve timing starts to let it work like a much larger engine.....below that, it sips fuel/air for good mpg numbers, as that's where most people drive....in that rpm range. Your old 360 had no variable valve timing, it was always sucking in lots of air & fuel...which is why it got such lousy mpg, but also why it seems to have more power right now, cuz it is already swallowing what it needs to.
If you want your hemi to be like your old 360, get a tuner and lock out the VVT and MDS stuff, so you will always have power & max fuel/air flow...and get a 2nd job to pay the fuel bill.
The ramcharger in my avatar was fun to drive, and I miss it too. It had a 360 I built, and while I don't know the exact HP for sure, I DO know, it had enough to push a 6300 lb 4x4 on 40" tires with all the aerodynamics of a barn and only 4.56 gears to a 9.2 sec 1/8 mile, chirping the tires on the 1-2 shift as it did it.......and it got 10 mpg, no matter how it was driven.
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