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  #13  
Old 09-24-2009, 11:55 PM
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Re: 5.7 & 6.1 HEMI program.

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Originally Posted by HEMIBeast View Post
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Alfredo aka Hemibeast has volunteered to be the guinea pig for this project. The 5.7 Hemi TB appears to be pretty efficient as-is, but I think we can hog it out a little bit, make it feel a little more responsive.
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  #14  
Old 09-25-2009, 01:39 AM
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Re: 5.7 & 6.1 HEMI program.

The 5.7 and 6.1 TBs are the same. There's no performance gains from porting them. The stock TB flows well enough for 426ci at 6500rpm. The only gain is in throttle response.
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  #15  
Old 09-25-2009, 09:56 AM
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Re: 5.7 & 6.1 HEMI program.

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Originally Posted by Mike_Levy View Post
The 5.7 and 6.1 TBs are the same. There's no performance gains from porting them. The stock TB flows well enough for 426ci at 6500rpm. The only gain is in throttle response.
Some might argue otherwise, Mike. Several people have posted reductions in 1/4 times. Granted, most have been from larger blades.

I am not promising anything...which is why I've been so reluctant to take on throttle bodies from the Hemi crowd.Worst case scenario, I really do not think that we have anything to lose here...for HEMIbeast, if the only tangible gain he feels/sees is part throttle response, I think he'll find that it was worth the money invested.
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  #16  
Old 09-25-2009, 02:37 PM
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Re: 5.7 & 6.1 HEMI program.

They can argue whatever, but the actual CFM numbers don't lie. The actual gains may be from the air having an easier route through. The TBs CAN flow enough, but when they do they're closer to their max. So perhaps by allowing them to flow less then that, the efficiency allows more power? Don't know.

I'm running a 90mm Arrington with a 370, so obviously I don't follow my own statements.
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  #17  
Old 09-25-2009, 09:41 PM
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Re: 5.7 & 6.1 HEMI program.

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Originally Posted by Mike_Levy View Post
They can argue whatever, but the actual CFM numbers don't lie. The actual gains may be from the air having an easier route through. The TBs CAN flow enough, but when they do they're closer to their max. So perhaps by allowing them to flow less then that, the efficiency allows more power? Don't know.

I'm running a 90mm Arrington with a 370, so obviously I don't follow my own statements.
I noticed that.

This R&D TB with Hemibeast is just that....R&D...If he likes what he sees, and notices a difference, I'll keep cranking them out. If there is virtually no difference overall, then that'll be the end of it.
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  #18  
Old 09-25-2009, 09:47 PM
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Re: 5.7 & 6.1 HEMI program.

Im sure I'll notice a difference. If I dont... No big deal... Ive seen on the redsite PLENTY of SRT8 guys ranting and raving about there mildly ported tb and the difference they seen.
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  #19  
Old 09-25-2009, 11:13 PM
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Re: 5.7 & 6.1 HEMI program.

I researched all this crap before (and all the info is on the red site), when I was doing CAI testing. A 6.1L motor requires just 560cfm at 6500rpm, assuming 80% VE. The 90mm flows 819cfm, which is 178 more then stock. Therefore the stock TB flows 641cfm. If it matters, a 440ci Hemi requires just 662cfm @ 6500rpm/80%.

The numbers say that stock is plenty for a 426 or smaller, unless they're revving the piss out of it or changing the Volumetric efficiency with forced induction. Any thing that people are "feeling" is presumably in their heads, unless its being caused by a leaner mixture. We need to see testing from somebody with a wideband to prove that. It is possible though since the Hemis use Speed Density metering, at least for temporary gains.
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  #20  
Old 09-26-2009, 06:34 AM
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Re: 5.7 & 6.1 HEMI program.

Quote:
Originally Posted by Mike_Levy View Post
I researched all this crap before (and all the info is on the red site), when I was doing CAI testing. A 6.1L motor requires just 560cfm at 6500rpm, assuming 80% VE. The 90mm flows 819cfm, which is 178 more then stock. Therefore the stock TB flows 641cfm. If it matters, a 440ci Hemi requires just 662cfm @ 6500rpm/80%.

The numbers say that stock is plenty for a 426 or smaller, unless they're revving the piss out of it or changing the Volumetric efficiency with forced induction. Any thing that people are "feeling" is presumably in their heads, unless its being caused by a leaner mixture. We need to see testing from somebody with a wideband to prove that. It is possible though since the Hemis use Speed Density metering, at least for temporary gains.

I can agree with you but it's just like a set of heads. A stock motor does not need them but they still benefit from them because of more efficient delivery. I have a 1000 CFM TB on one of my motors. Does it need it? NO, but it helped a great deal.
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  #21  
Old 09-27-2009, 02:49 PM
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Re: 5.7 & 6.1 HEMI program.

It's out...




And ready to go!!!


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  #22  
Old 09-27-2009, 03:01 PM
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Re: 5.7 & 6.1 HEMI program.

hmmmm...not much room to work there. Looks like it maxed pretty much out right now----
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  #23  
Old 09-27-2009, 03:23 PM
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Re: 5.7 & 6.1 HEMI program.

yeah it does. But on the other side it could definitely use it as it necks down a good amount.
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  #24  
Old 09-29-2009, 10:48 PM
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Re: 5.7 & 6.1 HEMI program.

Hemibeast's throttle body has been completed. I had to work on a deadline, had some issues with my gear not working properly and was missing a few tools that I normally have, but regardless I am confident that the TB will show some gains, even if only at part throttle.

I thinned out the inlet to be about 1/16" all around as opposed to the 3/16" that it was from the factory. On the backside, I believe the original measurement from wall to wall was 3.25". With the help of Hemibeast, we hogged it out to 3 3/8" to match his intake manifold. I also ran an agressive knife-edge on the blade.

Special thanks goes out to Alfredo for his cooperation and patience during this. I hope you're happy with the newfound performance!

Ultimately whether or not I do any of these TBs depends on what he reports...but I feel like there has been touch much material left to remove for it to NOT post gains.
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