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Ok i have search and read many posts but still don't know what to do in order to get this motor to idle when its cold. Running a Elite 1500 ecu. I added a BAC and plugged it into DPO4 and tried the settings from a guy on YouTube but like him the engine just idled to fast. Then I found another thread that said to set the BAC to 500Hz but didn't say where to put the duty cycle. I have it currently at 60%. The car will start fast and Idle for about 10 seconds and then the BAC acts like its sucking or pushing air out the one port which then causes motor to die. So basically I am at a loss on what to do. Once its warmed up it runs great and idles fine. Being as the motor has been transplanted into a Triumph GT6 (similiar to a Spitfire only with a hardtop) its pretty quick and boost is awesome. Just need to figure out this idle issue before we head to Florida after xmas for 3 months. Otherwise it will have to wait until I get back home to mess with it. So any help will be greatly appreciated
I'll send my BAC settings when I get home so you can try them. I am running a 6 port S5 Turbo on Haltech 1500 with NSP firmware.
Well tried your settings and with the motor cold the RPM jumped up to like 2500 and wouldn't come down. So I am at a loss. I don't have any good tuners of the 13B here in Charleston SC. I am sure there is a setting somewhere or a line item that is missing. I had to put my HZ to 500 and output to 45% to bring idle back down.
Last edited by toyzforme; Dec 17, 2025 at 05:21 PM.
Relisys190
Several of my screens don't look like yours like the Idle Control Base Output (just changed mine) and the Idle Control Target RPM. I don't have any speed sensing installed as this is a custom install into a car in my avatar.
Well at least we know your BACValve is working properly! Everyones settings will be slightly different. Also, ignore my speed sensing axis as it's irrelevant. My FC does not have wheel speed sensors.
Well at least we know your BACValve is working properly! Everyones settings will be slightly different. Also, ignore my speed sensing axis as it's irrelevant. My FC does not have wheel speed sensors.
The biggest problem I have is when it does climb to 2500 RPM I don't know how to bring the idle back down. I have already had the bitch next door call the HOA on me for loud car.
Other than the frequency, 300hz is good, the settings need to be individualized for each combination. One duty cycle map won’t work for all combinations.
Start with adjusting the mechanical idle to slightly less than target when the engine is warm with the BAC closed. If 900 is the warm target, set mechanical idle to 850ish. At this warm idle you also want the duty in the 20-30% range, which is the low end of the useable range of the valve. Adjust the mechanical idle accordingly. Once you establish that, you can move to the cold start stuff.
Other than the frequency, 300hz is good, the settings need to be individualized for each combination. One duty cycle map won’t work for all combinations.
Start with adjusting the mechanical idle to slightly less than target when the engine is warm with the BAC closed. If 900 is the warm target, set mechanical idle to 850ish. At this warm idle you also want the duty in the 20-30% range, which is the low end of the useable range of the valve. Adjust the mechanical idle accordingly. Once you establish that, you can move to the cold start stuff.
What duty cycle are you talking about? I'm a complete newbie at this and trying to find everything in the NSP software is challenging to say the least. I have to figure out how to set the mechanical idle as what I was adjusting must not be it as the throttle stop isn't even touching the adjustment screw.
