MTM Dyno Plot
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MTM Dyno Plot
<center><img src="http://www.ultimategarage.com/S4WG3.JPG"></center><p>Car is 2000 S4 6-speed with MTM chip. Note that car makes over 200 ft lbs torque at 2000rpms. HP maxes at 5075rpm. This is hp at the wheels...figure 20-25% correction factor for flywheel hp. Thanks to Page Pokler for plotting the charts. SD
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Torque Makes Boost - Curves are practically identical
<center><img src="http://www.ultimategarage.com/S4WG2.JPG"></center><p>Max boost is 17.3 psi (stock was around 6.5psi). Temps were warm at test time...around 85-90F. SD
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AFR vs Corrected HP
<center><img src="http://www.ultimategarage.com/S4WG1.JPG"></center><p>Starts out around lambda (afr of 14.7) but MTM adds lots of fuel as boost increases. I don't know why they don't flatten the fuel to around 13-13.6. I suspect there is improvement to be made here. SD
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For those wondering...
AFR Comment
6.0 Rich Burn Limit (fully warm engine)
9.0 Black smoke/low power
11.5 Approximate Rich Best Torque at wide-open throttle
12.2 Safe Best Power at wide-open throttle
13.3 Approximate Lean Best Torque
14.6 Stoichiometric AFR (chemically ideal)
15.5 Lean Cruise
16.5 Usual Best economy
18.0 Carburetted Lean Burn Limit
22+ EEC/EFI Lean Burn Limit
EEC (Evaporative Emissions Control), EFI (Electronic Fuel Injection)
6.0 Rich Burn Limit (fully warm engine)
9.0 Black smoke/low power
11.5 Approximate Rich Best Torque at wide-open throttle
12.2 Safe Best Power at wide-open throttle
13.3 Approximate Lean Best Torque
14.6 Stoichiometric AFR (chemically ideal)
15.5 Lean Cruise
16.5 Usual Best economy
18.0 Carburetted Lean Burn Limit
22+ EEC/EFI Lean Burn Limit
EEC (Evaporative Emissions Control), EFI (Electronic Fuel Injection)
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uh... hmmm.. why does HP max out (flatline, too) at 256?
Don't tell me they used a byte to represent HP??
And yeah, what about the rest of the way to redline?
Oh, and I hope you really mean wheel HP... the car is supposed to be 250HP at the crank *STOCK* :-)
-T
And yeah, what about the rest of the way to redline?
Oh, and I hope you really mean wheel HP... the car is supposed to be 250HP at the crank *STOCK* :-)
-T
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