Can someone explain why you need a lower stall for N20?
09-21-2004, 06:56 AM
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Can someone explain why you need a lower stall for N20? I keep seeing people talk about stalls and nitrous. Why do you need a lower stall with nitrous than you do N/A? Thanks.
09-21-2004, 08:31 AM
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Lower -rated- stall. Because app stall speed (or properly
the amount of RPM slip under load across the range) is
dependent on the torque applied, when you up the
torque by N2O you get a lot more slip. So to get the
target shift extension, or avoid some inefficiency under
max power conditions you would go with a tighter
converter. Trading off maybe a little street for the big
shot to be optimized.
the amount of RPM slip under load across the range) is
dependent on the torque applied, when you up the
torque by N2O you get a lot more slip. So to get the
target shift extension, or avoid some inefficiency under
max power conditions you would go with a tighter
converter. Trading off maybe a little street for the big
shot to be optimized.
09-22-2004, 12:01 AM
#6
TECH Senior Member
There is one more reason besides the increased stall speed and shift extension caused by the increased power of using nitrous....a lowered powerband. Take a 100 shot, for instance. It adds 100 HP no matter what RPM the engine is turning. If the engine is spinning at lower RPM, let's say it's making 200 HP NA at this point, then the percentage increase will be greater than when the engine is spinning at a higher RPM where more HP is made. 100 HP is a 50% increase over 200 but only a 25% increase over 400, for example. Thus we can see that our powerband is shifted downward in the RPM range. This is also the reason that our shift points should be lowered somewhat when using nitrous.
BTW, this is assuming a single stage nitrous kit. Multiple stages based on RPM obviously change the rules here.
BTW, this is assuming a single stage nitrous kit. Multiple stages based on RPM obviously change the rules here.
