Posted by nrowles on August 27, 2018 at 07:01:45 from (71.251.155.138):
I am in the process of fine tuning a Holley 670 Street Avenger Carb (electric choke and vacuum secondary) on my 1965 Mustang with a mildly worked 351W and 4 speed toploader in it. Here are some details and what I've done so far. Through some trial and error I have progressed considerably.
-Timing has been set (16 at idle and all in 37 at 2500 rpm)
-6 psi coming from mechanical fuel pump
-Bowls set correctly
-Idle mixture screws set from highest vacuum reading (750 rpm idle)
-I was getting a rich bog at WOT so I put a stiffer spring in the vacuum secondary and that has been fixed
-I had a slight surge at steady cruising speed in 4th gear so I bumped the primary main jets up a few and fixed it
-Accelerator pump arm and cam have been adjusted and work well
2 Questions:
The ONLY noticeable issue I see at this point is when I'm in 3rd cruising at a higher rpm (mostly because a corner might be coming up and I don't want to shift into 4th to seconds later shift back into 3rd) the car has a surge. It feels exactly like what I was experiencing with the lean surge in 4th. I upped the main jets a few and that fixed the 4th gear cruising surge. Would you assume that I need to increase the main jet size even more to get this lean surge out of 3rd gear, assuming that's what it is? It seems like the logical next step but I have to buy every part to experiment so I wanted to see if I could get any opinions before I potentially waste money experimenting.
If I can get this 3rd gear surge fixed and I cannot notice any issues at all, how do you go about getting very detailed with the fine tuning? IF I can find a buddy with some Holley parts kits, most things are easy to put in and undo so it wouldn't be a big deal to try and make it even better and if nothing works go back to what I originally have. Is it going to the drag strip and test and tune? I just wonder if this is the route to go because I'm not experienced and I think my launches are going to be different each time due to wheel spin, shifting, etc so the results might not be accurate. Anything else to give me data to fine tune?
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