Hemi torque curve
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Hemi torque curve
I saw the torque graph on the 05 hemi in a Dodge brochure it showed 310Ft/lbs from 1200RPM to 375 at 4400RPM but it was really flat for a gaser V8. I have not seen the 6.0 chevy or the 3V 5.4 to compare the 3 but the ford and chevy shouldn't be tthat much better. I have driven my dad's 04 QC 1500 2wd 3.92 anti, 20" wheels and it pulled 5K well for a 1/2 ton. So I ask why is there all this bashing of the hemi for it's low end?
Dustin
Dustin
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From: Norwood USA
More or less because this is a Ford site, and because of Fords advertising of the "80% of the 5.4's torque available at 1000RPM". The HEMI is a very powerful engine, it does wind up to higher RPM's to gain all of its power, but it is definitely a potent engine down low as well with a flat, linear torque curve. A lot of people will also say that its just a marketing scheme and that chrysler puts the engine in everything- but I don't think one of these guys could say that they wouldn't mind having the 5.4 in their Ford 500 or in their Explorer, etc.
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ya I figured that.
I have nothing agianst the 5.4 at all but was just wondering.
Also I saw that 3500 models have a payload of 4500lbs + that is DRW'S right.
What is the GVW rating of the reg cab 2500's?
I have nothing agianst the 5.4 at all but was just wondering.
Also I saw that 3500 models have a payload of 4500lbs + that is DRW'S right.
What is the GVW rating of the reg cab 2500's?
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From: York, NE
Maybe it's cahnged for 05, but the dynos I've seen of hemis show them to have almost nothing below 2000 RPM's. These are from dyno pulls by members of different Dodge boards. Dyno's I've seen posted of the 5.4 show a torque curve that reaches it's plateau at around 1800 RPMs and is flat (+/-3 ft-lbs) till close to 4500 RPM's where it then drops off rapidly. My main beef with the 5.4 is that it redlines, and shifts at 5000 RPM's, which is also the RPM where it peaks in HP, and the fact that it is mated to a 4-spd auto, where most everyone else has switched to a 5-spd with lower bottom gearing to take advantage of their higher powerbands. It's not that the Hemi has great low end, it's that it has a tranny geared low enough to get it into the higher RPM's sooner so it doesn't get bogged down as much. I feel with better gearing, along with letting the motor spin a bit higher it could easily shave 5/10's off an F150's 1/4 or 0-60 times.
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From: Norwood USA
Fords auto tranny's have never-IMO- been geared very well to the engines power curve. My 94 F150 has this issue too, it always shifts up early, and the next gear bogs down the engine. It seems as though they are geared towards getting better mileage rather than better pulling performance.
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From: Jacksonville, FL
Originally Posted by AG4.0
Maybe it's cahnged for 05, but the dynos I've seen of hemis show them to have almost nothing below 2000 RPM's. These are from dyno pulls by members of different Dodge boards. Dyno's I've seen posted of the 5.4 show a torque curve that reaches it's plateau at around 1800 RPMs and is flat (+/-3 ft-lbs) till close to 4500 RPM's where it then drops off rapidly.
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From: 3rd Rock
So I ask why is there all this bashing of the hemi for it's low end?
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From: Norwood USA
Originally Posted by Tim Lamkin
You know... you’re on a Ford site! Not sure it was bashing, spirited yes.. bashing no.
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From: colorado
this is nothing. if you want to see real bashing go to Dodge Truck world and say you have a ford. better have thick skin!
on topic ,the dyno charts i've seen for the hemi aren't very impressive down low.
on topic ,the dyno charts i've seen for the hemi aren't very impressive down low.
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From: Everett, Wa
Originally Posted by Al Bundy
People have the assumption that because an engine makes good high end power, it means that the low end sucks. Well guys....this is no honda vtec motor with no torque.
But I will say the new stuff coming out is amazing in how wide the power bands are getting.
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Low end torque is all a matter of perception. Most gassers don't have "low end torque" if you are comparing to a turbo diesel. But in the world of small block gassers, the Hemi ranks very well. This board generally agrees that the Hemi has impressive peak torque (375 ft lbs in the truck, 390 ft lbs in the cars) and power numbers (345 truck, 340 cars) but the "low end" torque is a more sensitive topic as most Ford owners hang their hat on claims of best in class low end torque to feel better about their ride. Fact is, the Hemi does make somewhere north of 300 ft lbs from 1200 to redline (maybe even 1000 to redline). Simply put, it's torque curve resides north of the 5.4L at all speeds except perhaps 1000rpm (an engine speed that cannot be driven in an automatic). The Hemi is a great engine in my opinion, with only two valves and cam-in-block architecture it outperforms the 5.4L 3 valve with it's phasers, active manifold, etc. on both rating numbers and specific output. By specific, I mean rated power divided by displacement etc. Ford needs to improve the 5.4L (especially if the Hurricane is dead).
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From: Temperance,MI
IMO I think the hemi is stomping the new engine tech, I mean how long has OHV tech been around when ford came out with the new engines in 97 I was not very impressed with them. Both brands are beating around with the older tech engines we have all ohc engines we resort to supercharging alot of the time. Just my opinion we should have stuck with the trusty old 5.0 and the rest of them I think ohc is what it started as a race engine not a truck engine.
Just my 2 cents.
Curtis
Just my 2 cents.
Curtis