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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 09-19-2012, 12:20 AM
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for starters those packages get all that hp from the heads and cams. p&p'd heads can easily net you 40-60hp gains. the gains from a cam will vary widely based on the grind. the t/b in those cases is a nice supporting mod which probably nets them the "normal" t/b gain. those packages also come with a tune which accounts for some more of the hp...they aren't bolt on and go.

after thinking about it some more I think we are all asking the wrong question. why was the first dyno pull so low with all those mods? (Vararam, Diablo 93 tune, Aero 3030XL muffler, magnaflow y pipe, mechanical fan delete) 301 rwhp?
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  #22  
Old 09-19-2012, 12:26 AM
arlockstedt arlockstedt is offline
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could be the dyno. Or maybe his drives like an old man and the computer learned a less aggressive tune. So when he started cycling the key on and off and flooring it, with the new TB allowing more air through, it woke up...lol

Also i know i read the Stock 80mm TB flowed 1020cfm, but lets say the bored out TB flows more with less effort or strain on the motor making it easier to rev and making more hp??
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Old 09-19-2012, 01:05 AM
arlockstedt arlockstedt is offline
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just found this -
The Arrington 90mm drive-by-wire Throttle Body - 819cfm at Wide Open Throttle a full 178cfm over a stock 80mm throttle body..

stock = 641 / 1.5 = up to 427hp - 22% drive train loss = 333rwhp
90mm = 819 / 1.5 = up to 546hp - 22% drive train loss = 426rwhp

so an 85mm tb would be a great half way point and should make a difference if you have a bunch of bolt ons helping air in and air out.....
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  #24  
Old 09-19-2012, 10:04 AM
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Quote:
Originally Posted by arlockstedt View Post
just found this -
The Arrington 90mm drive-by-wire Throttle Body - 819cfm at Wide Open Throttle a full 178cfm over a stock 80mm throttle body..

stock = 641 / 1.5 = up to 427hp - 22% drive train loss = 333rwhp
90mm = 819 / 1.5 = up to 546hp - 22% drive train loss = 426rwhp

so an 85mm tb would be a great half way point and should make a difference if you have a bunch of bolt ons helping air in and air out.....
I sure hope those numbers are wrong becuase they are terrible if they are and Ram seriously needs to fix the design. the 2012 mustang 80mm tb is rated at 913cfm and the 90mm is rated at 1132cfm.

a little technical but here is pretty good write up wrt to tb size selection
http://www.lxforums.com/board/f88/th...ulator-194536/
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  #25  
Old 09-19-2012, 12:38 PM
arlockstedt arlockstedt is offline
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Using the chart is simple. If peak power is higher than the rpm in the 1.2 “/Hg column, or peak torque is higher than the rpm in the 0.8”/Hg column, then you should really consider an upgrade. If peak power is higher than the rpm in the 0.8”/Hg column, or your shift point is is higher than the rpm in the 1.2”.Hg, an upgrade can be of benefit in an “max-effort” application, but isn’t absolutely necessary. I even included accompanying power outputs, so you can also make a selection based off of expected N/A power.


Throttle Body Selection Chart
-----------80mm ----------85mm ---------90mm
---------0.8-1.2"/Hg ----0.8-1.2"/Hg ----0.8-1.2"/Hg
345_____5190-6360_____5920-7250_____6700-8200
370_____4840-5930_____5520-6760_____6250-7650
392_____4570-5590_____5210-6380_____5900-7220
426_____4200-5150_____4790-5870_____5420-6640
440_____4070-4980_____4640-5680_____5250-6430
N/A hp____360-500_______440-580_______510-660

390hp @ 5600rpm
407tq @ 4000rpm

so if you do anything really to the truck for ain in, and air out, you would really benefit from the 85mm tb....right??
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  #26  
Old 09-19-2012, 03:17 PM
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the left colum of the chart is displacement not hp so we'd use the 345 line unless you are running a 392 stroker

yes, IMHO an 85mm t/b would be a good supporting mod on our motors.
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  #27  
Old 09-23-2012, 05:13 PM
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Hey, newbie here. Say I got a ported 85mm t/b. Would my SuperChips support this..? Or do I not even need to worry about tuning for a bigger t/b?
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  #28  
Old 09-23-2012, 05:29 PM
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superchips will support this and u might need to tune for a bigger tb but it is not necessary.
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  #29  
Old 09-23-2012, 11:21 PM
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Thanks, moparornocar72. I only ask because I was messing around with my Flashpaq earlier today, and I could not find a specific option for a larger throttle body
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Old 09-23-2012, 11:54 PM
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It wont necessarily have a straight up option for it, like my Diablosport just has a throttle booster but I can also have them make a custom tune for me.
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