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Cheap & Simple Fcd For Electronics Buffs

666DAN

By 666DAN,
in Engines & Forced Induction

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666DAN Grand Master

666DAN

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dyno.jpg

As you can see my car won't be bothered by a bit of leaning :unsure:

I'm actually going to set the voltage clamp at 4.9V so I don't lose too much resolution on the factory map. The car is going in for a full ROM tune anyway, but the turbo maxxes out the AFM at fairly low boost pressures. So with the FCD I'm going to get it tuned for around 16psi and see how it goes.

mad082 Grand Master

mad082

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Posted

rich and retard isn't just at 5v on the afm. you can get it at 3v. when i got it it hit hard at about 3000rpm when it had just come on boost, but if i backed the boost down less than 1 psi it would rev all the way to 7000rpm without hitting it.

it is caused by the ecu running out of mapping for that amount of air at that rev range.

i would only ever get it at low rpm where the car would die for a split second then it would come back to life, light the tyres up and pull as hard as normal up to redline.

666DAN Grand Master

666DAN

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My ROM has already had the R&R tuned out of it (all cells have reduced fuelling and increased timing with respect to the factory settings) the FCD is purely to stop the ECU shutting down at 5.1v (where the map ends for the AFM) as it currently does.

My tune didn't lend itself to the upgraded fuel system and turbo, that's why it's rich, previous was running nice flat 12.5:1 AFR on 12psi with the stock turbo.

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