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Custom Dodge Ram Performance Mods - Engine - 5.7 HEMI V8 Discuss modifying your Dodge Ram with Performance Parts and Accessories!
Factory Spec: 5.7-liter HEMI® V8 engine - 390 horsepower, 407 lb-ft of torque.


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  #1  
Old 04-21-2011, 07:15 PM
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Default 4th Gen HP Peak

Does anyone know at what rpm the 4th gen hemi makes its power peak? Is there a difference between what the manufacturer states and what someone has found on a chassis dyno? I've been playing with my WOT shift points on my Superchips tuner. Currently I have it set at 5950rpm, but it seems like I may be revving too far past my powerband.
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Old 04-21-2011, 11:59 PM
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Be careful, these fourth gen Rams with the Eagle Hemi can't rev as high as the previous generation due to the valvetrain.
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Old 04-22-2011, 01:42 AM
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my stock Ram, 2 dyno runs, first one you can see where it shifted
I hope someone can read it, because i am lost

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Old 04-22-2011, 08:52 PM
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Based on GTyankee's dyno results, looks like the peak is right around 5275. Maybe someone smarter than me can be more accurate than that, but I'm calling it how I see it.
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Old 04-23-2011, 10:43 AM
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From your dyno results which are very close to mine.
Peak HP is at 5300 RPM:314:74 HP.
Peak tq is at 4400-4500 RPM:327:48 TQ.

There is no reason to raise max RPM above stock,unless your racing and your using 93+ octane gas cause your going to get some knock.
Looks to be a good 3rd gear dyno pull before it spiked and shifted into 4th gear.
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Old 04-23-2011, 12:27 PM
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I would change your WOT shifts to 5500 rpm...just above peak. By the time the trans shifts you'll still be in the meat of your torque/power band you won't risk over-revving it.

Like already stated it looks like peak hp is around 5300 and peak torque is around 4250-4500.
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Old 04-23-2011, 01:40 PM
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I bumped mine up to 5850 on the 1-2 shift and 5800 on 2-3 shift. Going to see how it performs...
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Old 04-23-2011, 08:27 PM
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Quote:
Originally Posted by chithead View Post
I bumped mine up to 5850 on the 1-2 shift and 5800 on 2-3 shift. Going to see how it performs...
Thats about as high as Superchips works,before it starts producing a slower shift.
You need to raise your rev limiter also or else it wont shift.
I would raise it to at least 6100 RPM.if your going to be shifting at 5850 RPM.
I think Superchips has a safety feature to force you to raise the rev limiter before the shift RPM???.
I lower my tq managment also to help it shift quicker.
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Old 04-26-2011, 11:59 PM
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Going to make a few runs shifting at 5800rpm, then switch to 5500rpm and see if my ET and MPH picks up. Will keep you posted.
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Old 04-28-2011, 03:15 PM
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Mine stopped gaining at 5300 rpm torque started to drop at 4300 rpm.
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