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-   Custom Dodge Ram Performance Mods - Engine - 5.7 HEMI V8 (http://www.ramforumz.com/forumdisplay.php?f=83)
-   -   4th Gen HP Peak (http://www.ramforumz.com/showthread.php?t=80730)

dustin72 04-21-2011 08:15 PM

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.

chithead 04-22-2011 12:59 AM

Be careful, these fourth gen Rams with the Eagle Hemi can't rev as high as the previous generation due to the valvetrain.

GTyankee 04-22-2011 02:42 AM

my stock Ram, 2 dyno runs, first one you can see where it shifted
I hope someone can read it, because i am lost

[IMG]http://img819.imageshack.us/img819/9...n0001nv.th.jpg [IMG]http://img708.imageshack.us/img708/8...n0002ce.th.jpg [IMG]http://img190.imageshack.us/img190/1...n0003pd.th.jpg

JmegacabinGA 04-22-2011 09:52 PM

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.

catsltd 04-23-2011 11:43 AM

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.

CHVYKLR 04-23-2011 01:27 PM

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.

chithead 04-23-2011 02:40 PM

I bumped mine up to 5850 on the 1-2 shift and 5800 on 2-3 shift. Going to see how it performs...

catsltd 04-23-2011 09:27 PM

Quote:

Originally Posted by chithead (Post 508444)
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.

dustin72 04-27-2011 12:59 AM

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.

barn 04-28-2011 04:15 PM

Mine stopped gaining at 5300 rpm torque started to drop at 4300 rpm.


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