Cant try to remember what the B is, but TDC is Best Lifeless CENTRE for for timing. All 20V's, irrespective of whether within the coast or highveld must have a btdc of ten deg. That means your inventory timing needs to be set at 10. iirc the throttle opener is https://barbarak024llk7.shoutmyblog.com/33739820/top-latest-five-toyota-4a-ge-urban-news