robertbartsch

So this new 5.7Liter hemi is being installed in the new Dodge/Benz trucks.

It is rated at 350HP.

Anyone know how it stacks up against our non-hemi motors? I read in a rag hot rod magizine that it has the next generation CPU and that you cannot mod it. Only exception is a cat back - period. All other mods screw the CPU.

I suppose this is what we have to look forward to in the future.

dug

iTrader: (10)

All I know is the hemi heads flow similar to ls6 heads.

miner_49

Why would anyone buy a performance vehicle if they won't let you mod it. If Dodge has indeed done that, then they are idiots. Must be the German ownership influence as nothing beats german factory engineering (in their minds at least).

CAT3

iTrader: (9)

farfromsomethin!

Bet you get a 14old out of a cyber cafe from downtown and they'd have that PCM open and ready to receive some binary coding, and all for a pack of smokes, and some on-line time.

BLK01WS6

MOPARS have been this way for as long as I can remember. Very few people know their coding. Only a few guys in detroit that used to work for chrysler...The only real computer mods that can be done for these cars are bought as performance packages directly from mopar performance. It really sucks....

99 Black Bird T/A

iTrader: (4)

Aren't there programing tools like LS1 edit for the Viper?

robertbartsch

OK, so you can't mod it.

Do our heads (LS6) really flow as well as a Dodge/Benz hemi?

I always wondered why more companies did not produce hemis; since they cost more to produce I now know why.

LS1derfull

I havent witnessed new hemi design heads from mopar but i can tell you there is low to no swirl from traditional hemi designs and chamber combustion is sluggish with lots of unburned areas by design. You havent seen it because its a step backwards in engineering kind of like adding 2 cylinders to a 318 to make aviper perf. engine. I will be willing to bet new"Hemi" design is more like a wedge than true hemi, at least if it is any good.

StevieZ

iTrader: (3)

Nope.

2001 Pewter WS6

iTrader: (43)

I read on a site that the new engine really isn't a "Hemi Engine" like back in the day. They are just calling it that. They said the Origional Hemi head design would never pass emissions. I have a link to the article at home. I will post it later if I can remember.

niphilli

I have heard this too. I think I remember reading somewhere that the "hemi" name was more of a publicity thing. The new "Hemi" heads do not have all that much in common with the older ones. They are definately new and improoved.

All I can say first hand is that those trucks sure do sound a lot like F-bods!

LEO

iTrader: (3)

I have witnessed a new 5.7 hemi pick up on MTI's dyno make 275 rwhp, that was bone stock.

Nine Ball

iTrader: (38)

I have witnessed my nearly stock (airbox only) 5.3L GMC with huge tires whip up on a couple Hemi Dodge trucks. Those things are still slow. My truck is probably a mid-15 truck on a good day.

Tony

MrYenko

Ive seen these heads, and with the exception that they're more production-oriented than elephant heads ever were, they look pretty kick-***.

The intake port is basically a straight shot into the back of the valve head, and the exhaust ports aint bad either.

I just think its unfair to compare a modern production-oriented engine to something Chrysler only built (in the non-smog '60s mind you) as a race-homologation peice.

The new Hemi is pretty badass. The heads CERTAINLY have a lot of potential. Its just that the only heads anyone has seen are the lo-po truck heads. Wait till the performance versions come out in passenger cars to truely judge the motor.

99 Black Bird T/A

iTrader: (4)

Saw the flow numbers for a mildly ported new hemi head with stock valves. The flow was right in there with a set of ported LS6 heads. I know flow numbers aren't the be all end all, but seems like the new Chrysler "hemi" should have potential. Read an article that claimed Chrysler evaluated models of the hemi, a wedge design, multi-valve and the hemi came out on top.

It would be pretty cool if the new "hemi" isn't much of a hemi and is really more of a wedge.

wrencher

iTrader: (2)

I've heard some thing about this motor I dont like.
The oiling system in particular.
The bottom end is strait forward but it's valvetrain oiling that's useless.
It starts off with .040 restrictors to feed each oil galley to the head.
Then the oil flow is backward, to rocker down push rod then to lifter?
Makes no sense to me.
One little chunk of sludge could wreak havoc in this motor!
Not a big fan of Dailmer/Chrysler new motor offerings as of late.
This 5.7 shares alot of technology with another new chry. motor the 2.7 V-6.
It was introduced in'98 & has a simular oiling system & is on it's way to being the most remanufacted engine in the U.S.
Wonder how the "hemi's " will do??

66ImpalaLT1

My understanding is that the truck cylinder heads have a serious design flaw that causes detonation. They have an updated calibration for the pcm that cuts the timing back so far that you lose a significant amount of power.

Eric

Jorday

heh heh

I didn't think that they were real impressive considering all the hype.

Jordan

Cheatin' Chad

iTrader: (3)

I know the heads are dual plug which I don't care for. I Heard they flow a little less than a stock LS6 head.

Check this out: http://www.dynoperformance.com/searc...ils.php?ID=488

LS1derfull

Well 275 rwhp isnt all that and a bag of chips, Stock LS1's dyno 290 to 310 rwhp and they are only rated at 310flywheel not 345 like "hemi". I wonder if Dodge is running 4 cats. like Ford just to get there v-8's to pass emissions?LOL