How do you do em fast and clear???

practice them slowly and clearly.

When playing fast, do not even attempt to play legato, and do not turn the thumb under at all. Does this help? There are also many different ways to practise them.

is it necessary to use the pedal in order for fast arpeggios to be legato?

the wrist and hand can not be locked down and must move as one
yet independent parts... i once took a master class... and the teacher
said... "think of your fingers as wearing different types of shoes...
in this case you want nice light touch like ballet shoes... the fingers
should barely touch the bottom of the key like a foot barely
touching the floor, the leg bends as a shock absorber, so too
does the wrist..."

He was teaching me a Chopin waltz at the time however the same
rings true with arpeggios... and active finger tips always...

thats what i do but it doesn't sound very clear =-[

No. Just the opposite, in fact. When practicing arpeggios, do so without the pedal, to make sure the legato is not broken. Good wrist flexibility will facilitate legato arpeggs. A common error is to try to span the intervals with the fingers, an impossible task. The wrist must lead the hand into position, before the note is played. Reaching with the fingers is never correct.

Practice.

Slowly.

Yes, that's right, but don't forget to also practice quickly! Slowly and quickly. The difference in practice speeds from day to day will break even the most stubborn plateau. Practice differently.

Pete

oh yes, the much loved arpeggios... i suggest taking a thirty minute or even fifteen minute interval of time to practice ONE apeggio only and starting with triplets on 60bpm and play that ONE arpeggio scale OVER and OVEr and OVer(i kno it will sound babyish or stupid, but u'll be suprised) then use ur own opinion to determine when u feel it is perfect, perfection and clarity is key, thats what u want rite? then once u decide u have mastered 60bmp then increase tempo to 72bmp then 80bmp then 92 then 100 etc... It does wonders for me, hope it helps u. keep a consistent, continuous motion, try not to break sound and scale!!!

Good work. You must be the arpegio king...... ...You have the patience.

Continuity.

Pete

Plural of arpeggio is arpeggi, not arpeggios.
I think..

Learn Chopin Etude no.1 op.10

Advice in the books by Josef Lhévinne and Abby Whiteside, when put together, helped me the most. IMO, try not to purposely reach with the tips of your fingers, that makes playing bumpy and forte almost impossible. Fingers alone are not meant for such acrobatics. Instead I make my chord formation by spreading the palm muscles, and I found that this technique allows for a supple wrist. The fingers simply become a bony structure, which you will play against. Upon Whiteside's advice, I use mostly the upper-arm (and some forearm in co-operation with upper) to apply the power and the distance. With your chord formation in the palm, your wrist should be flexible enough to fling your arm to the next position, like cracking a whip. Playing them this way, I do not turn my thumb under unnaturally, but I find that nature does it slightly for me. I could say more, but I recommend checking out the authors I mentioned.