A
Anonymous
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I want to use a Ebay Turbo but have no clue how to get the maps for the turbos that are for sale... any Ideas?
I found this one on turbobygarret.com, that works perfectly my line up ends up almost PERFECT on the dotted line. Except it says for engines 400-600 hp, which i doubt my car will be putting out.
After doing ALOT of research this is what I found. Can anyone second check this? I followed there example so where I didn't know info I followed theirs. So I don't know about VE and stuff.
Wa = HP * A/F * BSFC/60
Where:
· Wa = Airflowactual (lb/min)
· HP = Horsepower Target (flywheel)
· A/F = Air/Fuel Ratio
· BSFC= Brake Specific Fuel Consumption (lb/hp*hr ) ÷ 60 (to convert from hours to minutes)
Wa = 300 * 12 * .57/60
Wa = 34.2
MAPreq = Wa * R * (460 + Tm)
VE * N/2 * Vd
Where:
· MAPreq = Manifold Absolute Pressure (psia) required to meet the horsepower target
· Wa = Airflowactual(lb/min)
· R = Gas Constant = 639.6
· Tm = Intake Manifold Temperature (degrees F)
· VE = Volumetric Efficiency
· N = Engine speed (RPM)
· Vd = engine displacement (Cubic Inches, convert from liters to CI by multiplying by 61.02, ex. 2.0 liters * 61.02 = 122 CI)
MAP = 34.2 * 639.6 * (460 + 140)
.89 * 5500/2 * 200
MAP = 13124592
489500
MAP = 26.8122
P2c = MAP + ΔPloss
Where:
· P2c = Compressor Discharge Pressure (psia)
· MAP = Manifold Absolute Pressure (psia)
· ΔPloss = Pressure Loss Between the Compressor and the Manifold (psi)
P2 = 26.8122 + 2
P2 = 28.8122
P1c = Pamb - ΔPloss
Where:
· P1c = Compressor Inlet Pressure (psia)
· Pamb = Ambient Air pressure (psia)
· ΔPloss = Pressure Loss due to Air Filter/Piping (psi)
P1 = 14.7 – 1
P1 = 13.7
Pr = P2c/ P1c
Pr= 28.8122/13.7
Pr= 2.103
According to my best calculations thats what I got ... jeez that was confusing enough then I get to search maps =(.
I want to use a Ebay Turbo but have no clue how to get the maps for the turbos that are for sale... any Ideas
I found this one on turbobygarret.com, that works perfectly my line up ends up almost PERFECT on the dotted line. Except it says for engines 400-600 hp, which i doubt my car will be putting out.
After doing ALOT of research this is what I found. Can anyone second check this? I followed there example so where I didn't know info I followed theirs. So I don't know about VE and stuff.
Wa = HP * A/F * BSFC/60
Where:
· Wa = Airflowactual (lb/min)
· HP = Horsepower Target (flywheel)
· A/F = Air/Fuel Ratio
· BSFC= Brake Specific Fuel Consumption (lb/hp*hr ) ÷ 60 (to convert from hours to minutes)
Wa = 300 * 12 * .57/60
Wa = 34.2
MAPreq = Wa * R * (460 + Tm)
VE * N/2 * Vd
Where:
· MAPreq = Manifold Absolute Pressure (psia) required to meet the horsepower target
· Wa = Airflowactual(lb/min)
· R = Gas Constant = 639.6
· Tm = Intake Manifold Temperature (degrees F)
· VE = Volumetric Efficiency
· N = Engine speed (RPM)
· Vd = engine displacement (Cubic Inches, convert from liters to CI by multiplying by 61.02, ex. 2.0 liters * 61.02 = 122 CI)
MAP = 34.2 * 639.6 * (460 + 140)
.89 * 5500/2 * 200
MAP = 13124592
489500
MAP = 26.8122
P2c = MAP + ΔPloss
Where:
· P2c = Compressor Discharge Pressure (psia)
· MAP = Manifold Absolute Pressure (psia)
· ΔPloss = Pressure Loss Between the Compressor and the Manifold (psi)
P2 = 26.8122 + 2
P2 = 28.8122
P1c = Pamb - ΔPloss
Where:
· P1c = Compressor Inlet Pressure (psia)
· Pamb = Ambient Air pressure (psia)
· ΔPloss = Pressure Loss due to Air Filter/Piping (psi)
P1 = 14.7 – 1
P1 = 13.7
Pr = P2c/ P1c
Pr= 28.8122/13.7
Pr= 2.103
According to my best calculations thats what I got ... jeez that was confusing enough then I get to search maps =(.
I want to use a Ebay Turbo but have no clue how to get the maps for the turbos that are for sale... any Ideas
