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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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  #21  
Old 12-27-2009, 01:06 AM
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Quote:
Originally Posted by HEMI5150 View Post
yeah thanks, i know how dyno`s work...
i own one for tuning race engines in my shop for the harley guys.
Guess i`ll just stick to tuning harley race engines, and just use this new 300hp dodge hemi to haul`m to the racetrack
Then you will know that motorcycle manufaturesrs rate at the crank as well.

You will also know that dyno numbers are just a tuning number. Your dyno may not read the same as the dyno at my race shop. In the end the differential between where you started and what you ended up with at the end of the tuning session is key.

But you already knew that.
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  #22  
Old 12-27-2009, 11:25 AM
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Default oop`s, sorry guys

Yeah, you guyz are right... i dont wanna start any pissin contests
so i`m sorry for the threads/comments i wrote.


What i was really tryin to say was, its all the hype when dodge came out with this flamed up 390hp, and all the hyped up looking commercials on TV (and where ever else they had commercials) to make it sound like this was gonna be some kryptonite super truck... one could believe real easy by thinkin they were really puttin 390/407 to the ground by seeing ALL the hyped up commercials by the way they presented this truck when it came out. I myself was overwhelmed when i heard about and then drove one. Dodge finally did build a nice truck... and dont get me wrong here, i`ve owned many dodge trucks in all my 50yrs... never drove a chevy or ford that ever impressed me (and yes i`ve owned a few chevys and fords too, but never for more than a month...lol) So anyway, i just didnt think about WHY i was only seein small numbers from the other guys posting their dyno number results... so once again, sorry, you guys are right.
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  #23  
Old 12-27-2009, 11:38 AM
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Quote:
Originally Posted by fireman View Post
Then you will know that motorcycle manufaturesrs rate at the crank as well.

You will also know that dyno numbers are just a tuning number. Your dyno may not read the same as the dyno at my race shop. In the end the differential between where you started and what you ended up with at the end of the tuning session is key.

But you already knew that.
Yup, i knew that...
well anyway, when i build/manufacture a bike for a customer, they get a dyno print out of real hp/trq measured at ther rear tire so they KNOW up front exactly what they`re buying. Too bad ALL the manufacter`s dont do that... that would be more to the truth of hp/trq numbers as the end user result, now wouldnt it. I myself dont care whats at the crank, i would MUCH rather know whats at the tires/pavment when i stab the throttle thru the headlights.

Rock on...!
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  #24  
Old 12-27-2009, 12:28 PM
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Quote:
Originally Posted by HEMI5150 View Post
Yup, i knew that...
well anyway, when i build/manufacture a bike for a customer, they get a dyno print out of real hp/trq measured at ther rear tire so they KNOW up front exactly what they`re buying. Too bad ALL the manufacter`s dont do that... that would be more to the truth of hp/trq numbers as the end user result, now wouldnt it. I myself dont care whats at the crank, i would MUCH rather know whats at the tires/pavment when i stab the throttle thru the headlights.

Rock on...!
I hear you. The numbers used by manufacturers is misleading. But is is the "standard". Much like in the motorcycle world they use dynojet dyno numbers. And those are much higher than other dyno numbers. After years of racing and building motorcycle race motors, I have just come to the conclusion that the dyno is a tuning tool.

But back to the original thread. The hemi puts 325hp to the ground, and my chevy made 315 at the crank. As everyone could imagine, my Dodge FEELS alot more powerful throughout the entire rev range. Bottom end torque to top end horsepower.

I am not really a cheerleader type. I think all of the truck manufacturers have good products. And when I made my decision to spend $45,000 on a new truck I did it carefully and looked at ALL of the options. 2 months later, I am still glad I bought the dodge.

Now, I have a predator tune in mine and I would like to get it tuned in the spring. What should I look for in a dyno tuner?
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  #25  
Old 12-28-2009, 11:52 PM
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...make sure the tuner is experienced in tuning trucks.. compared to lx's, the truck is a much more different animal to tune..
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  #26  
Old 12-29-2009, 12:08 AM
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I would still like to know the baseline before the tuner is installed. That is the important information. Although, not all trucks are the same and some dyno higher than others, but having a solid back to back dyno would be the the ideal comparison.
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  #27  
Old 12-29-2009, 12:18 AM
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..and the difference between a canned tune and a custom tune is obvious...
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  #28  
Old 01-03-2010, 10:36 PM
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why was your rear end replaced at only 500 miles?
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  #29  
Old 01-04-2010, 04:36 PM
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one thing missing from this is that prior to 1973 HP numbers were not sae net as they are today.. that is why you saw such a drop in numbers from 1971 to 1973 on the Chevy 454 for example..
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  #30  
Old 01-04-2010, 08:50 PM
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Quote:
Originally Posted by will View Post
why was your rear end replaced at only 500 miles?
I've got a '09 R/T and my rear gears had to be replaced within a few thousand miles too. The pinion seal leaked, we caught it, and they "fixed" it. Then it leaked again, I didn't notice, and it ran dry and destroyed the gears.

They tried to say it was due to my "driving habits"

I don't care how I drive it, the seals shouldn't be going twice within 1k miles of each other. Talking to guys that have worked at the axle plant, I'm more comfortable with the gears done by the dealer

I want a tune too, and I'll pry go the same route... Diablo hand held tuned locally on a dyno. The guys have issues are using canned tunes. In their defense, Diablo hasn't been very helpful.
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