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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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  #81  
Old 05-14-2010, 04:32 PM
Ruhyanuff Ruhyanuff is offline
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Hope this helps.

Turbine A/R - Turbine performance is greatly affected by changing the A/R of the housing, as it is used to adjust the flow capacity of the turbine. Using a smaller A/R will increase the exhaust gas velocity into the turbine wheel. This provides increased turbine power at lower engine speeds, resulting in a quicker boost rise. However, a small A/R also causes the flow to enter the wheel more tangentially, which reduces the ultimate flow capacity of the turbine wheel. This will tend to increase exhaust backpressure and hence reduce the engine's ability to "breathe" effectively at high RPM, adversely affecting peak engine power.

Conversely, using a larger A/R will lower exhaust gas velocity, and delay boost rise. The flow in a larger A/R housing enters the wheel in a more radial fashion, increasing the wheel's effective flow capacity, resulting in lower backpressure and better power at higher engine speeds.

When deciding between A/R options, be realistic with the intended vehicle use and use the A/R to bias the performance toward the desired powerband characteristic.

Here's a simplistic look at comparing turbine housing geometry with different applications. By comparing different turbine housing A/R, it is often possible to determine the intended use of the system.
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  #82  
Old 05-14-2010, 04:45 PM
TwinTurbo392 TwinTurbo392 is offline
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Thanks for the help with the A/R... I guess I will go with the .70 A/R since this isnt a real high reving motor especially if I stroke it I wouldnt want to go past 5500...and I want it to be snappy on the street...
But...
I think I might go with his 5.7l forged rotating for $1100... that would give me more money for other things... the 397cu in forged setup is $1935... I dont know if a liter is worth 800 bucks for a FI motor?

Last edited by TwinTurbo392; 05-14-2010 at 04:50 PM.
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  #83  
Old 05-14-2010, 05:38 PM
Ruhyanuff Ruhyanuff is offline
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Andy has got that sweet deal going on for the Forged parts, kinda hard to beat that.
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  #84  
Old 05-14-2010, 06:02 PM
TwinTurbo392 TwinTurbo392 is offline
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Yeah those are the prices from Andy.

$1100 for the 5.7l kit, this is a great deal!
$1935 for the 397 kit, but I can get that kit from another place for $2 more everyday.
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  #85  
Old 05-14-2010, 10:41 PM
Ruhyanuff Ruhyanuff is offline
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Jump On it.
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