CAI and 75MM TB
Member
Joined: Nov 2011
Posts: 17
Likes: 0
From: SE Arizona
Under drive pulley:
They tend to reduce the drive losses the motor sees that are equivelent to about 8hp +/-.
The other result is you loose alternator, A/C and possibly power steering performance at idle and low engine RPM such that it could be a hassle for some owners, at times.
They tend to reduce the drive losses the motor sees that are equivelent to about 8hp +/-.
The other result is you loose alternator, A/C and possibly power steering performance at idle and low engine RPM such that it could be a hassle for some owners, at times.
Thanks again, Bluegrass
Senior Member
Joined: Jul 2004
Posts: 6,200
Likes: 39
From: Easton, Pa.
Under drive pullies came about from the drag strip racers where the object was total performance.
....It's not to good for the street given the other unintended consequences.
....The Alternator may turn to slow, the A/C compressor may turn to slow, the fan may turn to slow and not cool the A/C condenser or the radiator in hot weather slow traffic, the battery charge may be an issue at times, lights dim at idle etc all for a 10 hp hassle.
....Companies market these things for their profit and care less what you have after you install them.
....Even electric fans are not a totally free power give back because the alternator has to generate current to run the DC motors. This in it'self takes power from the motor to turn the alternator under it's higher loading. So it's not all free power.
....The gain with electric fans is that the whole system has just enough 'efficiency' improvement to see some gain in getting power back that would have been used to pull air and turn the stock fan and the electric fan may just run a bit less at speed when it's not needed so much if the temperature sensors are set right and a step start/run controller is used to help reduce the current needed to run the system, overall..
....It must be known that fan motors to push/pull the amount of air in CFM required to match a stock fan consumes a lot of starting current and about half the amount while running under load.
....The old Lincoln and Tarus fans in the early to mid 90s drew nearly 140 amps at starting. These cars had very large alternators and fan controllers to handle this on a long term basis.
....It's not to good for the street given the other unintended consequences.
....The Alternator may turn to slow, the A/C compressor may turn to slow, the fan may turn to slow and not cool the A/C condenser or the radiator in hot weather slow traffic, the battery charge may be an issue at times, lights dim at idle etc all for a 10 hp hassle.
....Companies market these things for their profit and care less what you have after you install them.
....Even electric fans are not a totally free power give back because the alternator has to generate current to run the DC motors. This in it'self takes power from the motor to turn the alternator under it's higher loading. So it's not all free power.
....The gain with electric fans is that the whole system has just enough 'efficiency' improvement to see some gain in getting power back that would have been used to pull air and turn the stock fan and the electric fan may just run a bit less at speed when it's not needed so much if the temperature sensors are set right and a step start/run controller is used to help reduce the current needed to run the system, overall..
....It must be known that fan motors to push/pull the amount of air in CFM required to match a stock fan consumes a lot of starting current and about half the amount while running under load.
....The old Lincoln and Tarus fans in the early to mid 90s drew nearly 140 amps at starting. These cars had very large alternators and fan controllers to handle this on a long term basis.