F.A.S.T. and the Ramchargers dual fan unit

[oldtimer]

I've just installed the Ramchargers Dual Fan unit with the Ramchargers plug adapter.

I'm running a F.A.S.T. system with the Plug & Play adapter harness.

I've also removed the air conditioning compressor and lines

Has anyone got the same set-up and how did you get the fans to work properly ?? They sure push a lot more air on high speed.

I need help !

 

[Glen]

How do you want them to work? one on - one off till requested. One fan is a dual speed fan and one is a single speed. If you have access to a wire diagram the fans are from Intrepids/ Concordes. The FAST has only one lead for the fan, IF, you have the standard unit.

One way is with three relays. One constant on - slow speed, two for high @ request.

 

[oldtimer]

By standard unit, are you referring to the F.A.S.T. unit ?

I have the B to B with wide band o2 using Dan White's plug and play harness, so I use all the stock sensors.

Is it possible to have the fans wired to operate in the stock manor mith a manual switch for cooling in the pits ?

 

[Glen]

It's possible. I would use 2 relays, one for each fan. Energize the relays with the signal from the ECM and just splice the manual switch inline. If U R just using the car for drag duty I would skip the ECM signal and just use the manual switch.

 

[Craig Smith]

Glen's advice is the advice to follow here IMO. When the ignition is off, the FAST will not control the fans, so if cooling in the pits is a concern you should have manual control of the fans.

 

[oldtimer]

Thanks guys, much appreciated.

Craig, you answered my question. I wasn't sure about the control the F.A.S.T. system had on the fan circuit.