SU on an auto...

[Caen Fred]

Are not the same as on the manual!

The needles are not the same I was told... Is there any benefit to retrofit the std needles on my l24 as I am runing a 6/2/1 header with a twice pipe...

Just want to upgrade it before the l28 swap.

[Montezuma]

Are not the same as on the manual!

The needles are not the same I was told... Is there any benefit to retrofit the std needles on my l24 as I am runing a 6/2/1 header with a twice pipe...

Just want to upgrade it before the l28 swap.

I got the standard needles in my L24 with a 6/2/1 header and they seem to work fine. I have set of automatic needles but have not taken the time to load them in the SUs. The bottom line answer is; they will work.

[beandip]

I am running 54 needles in my SUs with a automatic. I did pick up a set of 3 screw SUs a while back and they had the #58 needles used in automatics. Now, these carbs came from Colorado and could have been used because of the high altitude. I don't know but the 58s are leaner. I was running 54 needles on my L-24 motor and now on my 280 ZX engine. I am also running headers and a street cam . I tried different needles and found the 54s work the best. SMs and 47s are WAY to rich and fuel diluted my oil in the crankcase with them. Now all is good both in performance and mileage . My 2cts. Gary

[Caen Fred]

coolisim information guys :classic: Are you using the needle and the nozle or just the needle????

[Caen Fred]

I tried the needles from my euro 73 carbs... run better on load but verry poor iddle... do I need to tune them a lot or is it because I didn't fit the nozzle that came with them??????????? :nervous:

[Montezuma]

I tried the needles from my euro 73 carbs... run better on load but verry poor iddle... do I need to tune them a lot or is it because I didn't fit the nozzle that came with them??????????? :nervous:

Sorry I am not sure on this one. Mine run fine but are far from perfect. Eventually I will send a set up to Z Therapy for proper rebuilding and tuning. I will have them done up with automatic needles unless advise by ZT to do otherwise.