NOS-15974 Controller FYI!
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Joined: Feb 2008
Posts: 2
From: Allison Park, PA
NOS-15974 Controller FYI!
FYI!
Anyone using or considering using this NOS-15974 controller: http://store.summitracing.com/partde...0&autoview=sku .... read on!
I bought this controller because it looked like the "swiss army knife" of nitrous controllers and it was fairly inexpensive at right around $250. It has two completely independent controllers for running dual stages. It offers an rpm window switch - shuts the nitrous off at a pre-set rpm to avoid hitting rev-limiter with nitrous flowing (rev-limiter + nitrous = BAD). It has a delay feature to allow nitrous to wait until you are in 2nd gear, or hooked up, or whatever. It also allows a progressive hit - ex: start at 20%, ramp up to 100% in 3 seconds, etc. Sound good huh?
I set mine up to window from 3k - 6k with my rev limiter on 6200. I set a 1.5 second delay to get into 2nd gear. I set 100% start, zero ramp, and 100% end (I wanted the full hit all at once). When the system activated it started to open the solenoids, but then there was a clicking sound coming from both solenoids. The longer they stayed on, the louder the clicking got and the hotter they got. Seems that they were not opening fully and not staying open properly. Holley tech support told me "Sounds like a bad ground or a bad controller". I ran direct grounds from the battery and it made NO difference. I was about to give up and return it, but I decided to try a progressive hit just for the hell of it. I set it on 50% start, 1 second ramp, and 100% end. IT WORKED PERFECTLY. Then I tried 100% start, 1/10 second ramp, and 100% end. Once again, it worked perfectly. The whole problem, it seems, is: YOU MUST PUT SOME VALUE IN THE RAMP TIME. It CANNOT be zero. It was a SOFTWARE PROBLEM!
All I can say is: Nice Tech Support Holley!
CLiffs....If you use a NOS-16974 controller, you MUST put some value in #5 - Ramp Time.
Also, it has been my experience that you never use a relay in-line with the solenoids, when using a progressive controller system. The relay will not open and close fast enough to create the correct progressive hit (usually around 15HZ or so).
Anyone using or considering using this NOS-15974 controller: http://store.summitracing.com/partde...0&autoview=sku .... read on!
I bought this controller because it looked like the "swiss army knife" of nitrous controllers and it was fairly inexpensive at right around $250. It has two completely independent controllers for running dual stages. It offers an rpm window switch - shuts the nitrous off at a pre-set rpm to avoid hitting rev-limiter with nitrous flowing (rev-limiter + nitrous = BAD). It has a delay feature to allow nitrous to wait until you are in 2nd gear, or hooked up, or whatever. It also allows a progressive hit - ex: start at 20%, ramp up to 100% in 3 seconds, etc. Sound good huh?
I set mine up to window from 3k - 6k with my rev limiter on 6200. I set a 1.5 second delay to get into 2nd gear. I set 100% start, zero ramp, and 100% end (I wanted the full hit all at once). When the system activated it started to open the solenoids, but then there was a clicking sound coming from both solenoids. The longer they stayed on, the louder the clicking got and the hotter they got. Seems that they were not opening fully and not staying open properly. Holley tech support told me "Sounds like a bad ground or a bad controller". I ran direct grounds from the battery and it made NO difference. I was about to give up and return it, but I decided to try a progressive hit just for the hell of it. I set it on 50% start, 1 second ramp, and 100% end. IT WORKED PERFECTLY. Then I tried 100% start, 1/10 second ramp, and 100% end. Once again, it worked perfectly. The whole problem, it seems, is: YOU MUST PUT SOME VALUE IN THE RAMP TIME. It CANNOT be zero. It was a SOFTWARE PROBLEM!
All I can say is: Nice Tech Support Holley!
CLiffs....If you use a NOS-16974 controller, you MUST put some value in #5 - Ramp Time.
Also, it has been my experience that you never use a relay in-line with the solenoids, when using a progressive controller system. The relay will not open and close fast enough to create the correct progressive hit (usually around 15HZ or so).
Registered User
Joined: Oct 2002
Posts: 315
From: Round Rock, Texas
Are you using 100 or 99 as the max value?
The progressive controls the ground to the solenoid, you will still use a relay on the 12v side of the solenoid.
similar to this....
Thread Starter
Registered User
Joined: Feb 2008
Posts: 2
From: Allison Park, PA
Using 99 as max value. No relay on either side. NOS wiring diagram did not specify using a relay or I would have.
All I give you is my own personal experience. If I leave #5 at 0 the controller will not work properly. Do you think I have a defective one then?
All I give you is my own personal experience. If I leave #5 at 0 the controller will not work properly. Do you think I have a defective one then?
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