1428 stage 7 jetting

[Rusty McNeil]

I'm no expert. But based on what your describing if it was mine I'd drop a couple of main sizes,
Then do the needle tuning.

The tuning method I place faith in tells you to tune from the top down, starting with the mains, not worrying about the needles until you got WOT "on the mains only" sorted.

I just run it in 4th from about 3500 to redline and call that area from 7500 to redline "on the mains" and tune from there. Sometimes will do that in 2nd and 3rd to for what its worth as I've tried to fine tune it.

Does your WideBand have any data logging?
That's helpful if you can play back a "run" , knowing you recorded it at WOT, (I don't have a TPS hooked to mine) i just turn the logging switch on and go, turn it off while Im winding down.
Then play it back on a laptop and watch the a/f versus rpm and try to figure out which part of the carb circuit things are happening regarding a/f

 

[Rusty McNeil]

Should be able to getting to work with eliminator s installed or vboost wired open....

I would have thought so too. PCW told me with the bigger cams combined with ported heads the overlap is too much. I've got mine running perfect. I can open the vboost at idle though and yep I get that awesome idle; but its accompanied by a fair amount if exhaust popping and intermittent but mild backfire.

 

[speedcostsmoney]

would like to know if you guys with the big engines 1570, 1428 do you gap your spark plugs to factory settings 0.031 to 0.035, because was reading on the NGK website and they say that for high compression ratio you should lower the gap by 0.004 for every 50 HP and a colder spark plug for 75 to 100 HP, just wondering how your plugs are set

 

[Rusty McNeil]

I gapped mine a little tighter.
Still stock heat range, at 13:1 probably should go colder but haven't, hoping the a/f will keep me out of Det.

 

[speedcostsmoney]

milled 0.025 off the heads, went one plug colder set the gap at 0.029 engine sounds good, at first set at 0.035, but engine sounded as if when to much choke but engine rev's are low sounded muffled

 

[tugla]

I would have thought so too. PCW told me with the bigger cams combined with ported heads the overlap is too much. I've got mine running perfect. I can open the vboost at idle though and yep I get that awesome idle; but its accompanied by a fair amount if exhaust popping and intermittent but mild backfire.

Good to know.....thanks.....