Originally Posted by
tabetha
Over to you sir, please explain why a air to air is needed and why a amal is seemingly so bad ?
An amal valve, whilst it can be pulsed, is a very crude device that offers limited control over its output, its essentially a mechanical bleed valve, so, as revs rise and air consumption increases we end up with boost tailing off and we cant do anything about it. Another scenario is a turbo that is too big and we want to save the bog boost until higher revs to combat surge or traction issues. Tricky to impossible with an Amal valve.
With Air Injectors on Weber we have 255 steps from open to closed so can control just how much air is allowed to flow to the wastegate at ANY RPM. So as boost falls, we can actually close the wastegate a little and speed up the turbocharger to compensate. On a modern ecu we have over 65000 values to play with.
Another bonus is we can keep all air from getting to the wastegate at all by closing the injectors at low revs and boost levels, thus speeding up the spool and arrival of peak boost pressure.
I did say the amal did the job perfectly well before before the next "thing" came along,
Its the whole "thing" where you insinuate that things are gimmicks just because you don't understand them.
It may well be that certain cars due to spec would benefit from air to air over amal, but doesn't mean amal can't do the job perfectly well on the majority does it
Agreed, but that isn't what you said now is it?
