19 replies to this topic

[lrostoke]

Its not a case of better, its which one works best with your car.

example

I've got a 1984 998 , my sisters is a 1989 998

Both have stage 1 both with the element in the airbox.
Hers runs fine with an AAU needle, mine had a flat spot you could trip over with the AAU, switching to the AAA for me cured it.

The higher the line the richer the needle runs on that chart

If your having it rolling roaded, then its possible they may have the skill to profile your needle for perfect results.

[jaydee]

yer i know hynes shows only AAC, but some hs4 were fitted with a weaker needle. anyway from that table i read AAC are richer than AAP above 5k rpm, am i reading right? let me no because that chart can be a useful tool

[lrostoke]

To be honest I've always looked at the graph as a whole, and ignored the rev scale..If that scale was right, pretty much all the needles are very similar upto 5000 rpm.

But being honest I'm really not sure..

[jaydee]

comparing AMM and AAA, wich are very similar and AAA is a little richer at mid revs, that scale seems to me quite right..

[lrostoke]

Like I say not 100% sure on the scale..The AAU and AAC are very similar upto 5000

ah haaa that scale isn't revs its what are called stations.

http://www.terryhunt.../picsb/pics.htm <---interested site on needle polishing

Each needle is seperated into 16 stations which if I'm right corrispond with the 0 - 16 scale on those graphs on the mintylamb site.

Edited by lrostoke, 30 January 2009 - 07:32 PM.