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Discussion Starter · #1 ·
Guys,

I really want to try and drum up some aftermarket company to build a composite intake for the 6.1L. They will only do this if there is a market for it. It is my understanding that the port configuration and location is the same for the 6.1L and 5.7L Hemi's, only the port shape is different. Can anyone verify this? If both 6.1L and 5.7L Hemi's could use the same manifold, a company may be interested in looking at it.

Todd
 

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As I understand it they do. The gaskets are the same part number at least
 

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I feel the need to go melt the tires off my car.............

JKetron
 

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Yes. From the looks of the 5.7 hemi. the Throttlebodies are the same. Im looking into having a prototype intake for the 5.7 and the 6.1 made. I went to a dealership and took a look at the 5.7 in a charger and compared it to the 6.1 in my srt8. I've found two leads so far that are willing to help make a intake for these motors.
 

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Not to piss on the fire, but I just don't understand the purpose unless you're going to be moving more air through the motor.

Besides, the stock intake on either the 5.7 or 6.1 is tuned for the cam profile.

With head work/cam/exhaust I could see this as an absolutely necessary mod.

As far as composite, I wouldn't think there's much heat soak on the raised manifold anyhoo.
 

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Discussion Starter · #6 ·
vvv90 said:
As far as composite, I wouldn't think there's much heat soak on the raised manifold anyhoo.
How about ~30rwhp drop with the manifold hot. I don't know how long it takes for the manifold to reach engine block/heads temperature, but once it does, it is taking some serious HP and TQ away.

My attempt is going to be based on 5.7 and 6.1L being able to share the same manifold. To be real honest, I think the 5.7L would gain power with the 6.1L manifold. Another perspective, FAST was able to extract more power out of the GM LSx series with their manifold and this was after a few years of people trying to convince us that GM used the latest in supercomputers to design this thing to take advantage of 2nd order and 3rd order flow harmonics or something like it.....

Anyway, the FAST LSX intake makes power over the stock ones, so I am betting there is power to be found here. It will certainly improve the power you and I feel on the road after 20 or 30 minutes of driving. The real nice thing about the Dodge/Chrysler intakes is that the fuel rail is more or less removed from the equation. It is supported differently than other makes and the injectors bore right into the very ends of the runners, making it a easier design than the others. I need to look a 5.7L LX platform manifold carefully, but I don't see any issues.

Todd
 

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WhiteDiamond said:
How about ~30rwhp drop with the manifold hot. I don't know how long it takes for the manifold to reach engine block/heads temperature, but once it does, it is taking some serious HP and TQ away.

My attempt is going to be based on 5.7 and 6.1L being able to share the same manifold. To be real honest, I think the 5.7L would gain power with the 6.1L manifold. Another perspective, FAST was able to extract more power out of the GM LSx series with their manifold and this was after a few years of people trying to convince us that GM used the latest in supercomputers to design this thing to take advantage of 2nd order and 3rd order flow harmonics or something like it.....

Anyway, the FAST LSX intake makes power over the stock ones, so I am betting there is power to be found here. It will certainly improve the power you and I feel on the road after 20 or 30 minutes of driving. The real nice thing about the Dodge/Chrysler intakes is that the fuel rail is more or less removed from the equation. It is supported differently than other makes and the injectors bore right into the very ends of the runners, making it a easier design than the others. I need to look a 5.7L LX platform manifold carefully, but I don't see any issues.

Todd
30RWHP.....hmmmm.....I'll remember you said that. ;) :D

Hey! If it's true, then rock on. I've always liked the idea of composite materials anyway. I just don't know about the HP gains...We'll see.

I can't wait for the aftermarket to step up and start offering these types of mods for the hemi's....It's only the most popular V8 out there.

Come on SEMA!
 

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Discussion Starter · #8 ·
1st SRT Magnum dyno'd his car hot and only nailed 335rwhp. It was redyno'd a few days later cold and dyno'd dang near right on with all the other dyno's we have seen so far, including mine. The Magnaflow guys also told me they did a test on the other car and saw very low numbers, but they didn't tell me what they where. 30rwhp is a lot.

It will be very hard to get some company interested in this application. The aftermarket is very weak for DCX and the inability to tune the PCMs will keep it weak. Until this changes, I really don't have much hope, but it is worth a try.

Todd
 

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WhiteDiamond said:
1st SRT Magnum dyno'd his car hot and only nailed 335rwhp. It was redyno'd a few days later cold and dyno'd dang near right on with all the other dyno's we have seen so far, including mine. The Magnaflow guys also told me they did a test on the other car and saw very low numbers, but they didn't tell me what they where. 30rwhp is a lot.

It will be very hard to get some company interested in this application. The aftermarket is very weak for DCX and the inability to tune the PCMs will keep it weak. Until this changes, I really don't have much hope, but it is worth a try.

Todd

You're right that power can be robbed big with heat, but keep in mind, all 30RWHP being robbed is not all the detriment of the manifold. It's the engine as a whole. Head's and especially the coolant sensor have a lot to do with retarding timing to control detonation which is really what robs power.

I do think the manifold is a big portion of it, but not all 30.
 

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Discussion Starter · #10 ·
That begs another question. Anyone know of a company offering a cooler thermostate for the Hemi motors?

Todd
 

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WhiteDiamond said:
That begs another question. Anyone know of a company offering a cooler thermostate for the Hemi motors?

Todd
Oh no, not this topic again. :D

It's been pretty beaten so I hope everyone doesn't get into a big arguement. :D

The stock 5.7 Thermostat is 203 degrees.

Personally I feel if you have to do BOTH a 180 T-stat AND fan mod to keep the car cool. Otherwise the temp won't come down. It's not a one or the other upgrade.

Hopefully a programmer can come up with a way to change the fan temps, otherwise a switch for the aux fan (if there is one?) will work.

Anyway, here's an interesting thread I found on the subject:

http://www.moparchat.com/forums/showthread.php?p=592956#post592956
 

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Discussion Starter · #13 ·
vvv90,

I agree....The issue with thermostats seems to give CEL on the trucks. It definately needs a programmer and a thermo to settle the issue. The 6.1 runs around 205 to 210 most of the time. It really like the 60 degree air in San Diego the morning I drove up to Magnaflow, though :D I can't wait for some temperature drop around here. Unfortunately, with the exhaust, the cops can find me easier :evil:

Todd
 

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I have changed my thermostat from stock to the 185 or 187 and my temp definately stays down about 10 to 15 degrees without any chip to regulate the fan. I am in Washington DC where it is quite hot and when I run the A/C and the aux Fan cycles on and off the engine never goes beyond 189 - 191.

I went to lower temp primarily to lower the heat that comes out from under the car when sitting at idle with the window down. I don't see a seat of the pants difference but the mobil one definately stays cleaner the last two oil changes.

Salty
 
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