Opinions...

523" ford, SCJ Heads, 10:1 compression

30* total timing w/ 24 total on the kit.

200ft dirt drag pass w/ 66/44 jets in the plate

I only see timing marks on 3,5,6... I don't have a way to set timing on individual cylinders.  Do you guys have any suggestions on a move to get more out of this tune?

Thanks,
Jon

what heat range plugs?

a used 7531 w an optic sensor is your friend

These are -9's...

More experience with "335" 351c motors on nitrous, however "385" similar but bigger. The farthest corners of the block typically have a lean condition unless the intake manifold has equal-distant runners. A few possibilities are; to richen the outer runners of the manifold by increasing the fuel available (increase holes slightly on a plate system or change the fuel jets on a direct port) which in turn should balance the system and allow for a more equal tune. This can also be done with direct port nozzles allowing the ability to individually tune the nitrous and fuel.

That tune is not lean in the corners in my opinion.  A little over timed in all cylinders especially in the corners but not too crazy. With that size of jet I wouldn't worry too much but when you turn it up the timing control is more important.  Jon was correct in my opinion, need an ignition with control such as the 7531 or grid.

whatbumper wrote:That tune is not lean in the corners in my opinion.  A little over timed in all cylinders especially in the corners but not too crazy.  With that size of jet I wouldn't worry too much but when you turn it up the timing control is more important.  Jon was correct in my opinion, need an ignition with control such as the 7531 or grid.

I agree, having previously not had the 7531's ability to control cylinder timing individually, I obviously have previously compensated through the incorrect methods. Individual cylinder timing is definitely the best answer.

whatbumper wrote:A little over timed in all cylinders especially in the corners but not too crazy. 

What are you seeing that tells you it is over-timed?

Thanks,
Jon

Cut the threads off

This is where the beauty of a direct port system comes in.. That way you can tune each hole as it needs. As mentioned, second option usually is ICT, but if you don't have that either I would look at IPT ! Individual Plug Tuning, this is the practice of running a colder plug in you three hot holes.. I would put a -10 in them and see if all looks more even.. SJ