choke adjustment on 7747

[hammertime371]

ya i should still endup with a range of adjustment no matter which spring used

[hammertime371]

good news... springs are in. im getting 17psi to 24psi on the bench test. i think thats just about right. single spring like original so hopefully that will cure the problem. the more i think about it i dont see how anyone can offer a spring with 12psi to 40psi range. the 1 on ebay cant possibly do what the auction says. even after market regulators use a low pressure spring to get 4psi to 20psi then you need to put the high pressure spring in to get 20 to 50psi. so i got 5 pressure guages of various styles that show within 1 pound of each other. not sure if they are actually correct but the repeat the same so ill use them. got 3 more that show 4psi more then the other 5. i was using these befor so the pressure may have been less than i thought all along. after work ill install the new spring and let ya know how it works!

[PJG1173]

I know this is off topic but as I read your above post I have to wonder why anyone would have that many pressure gauges laying around.

[hammertime371]

I know this is off topic but as I read your above post I have to wonder why anyone would have that many pressure gauges laying around.

lol...i work in a factory in a machine shop where i do repair work...fabrication,welding,etc...bla bla bla ...and maintence. so theres lots of spare stuff for all the production machines... i just get to "borrow" whatever i may need!

[hammertime371]

great news....springs works...steady pressure...no more misses or backfires...
throttle response much better...idle is better but still not smooth

i found the diaphram was leaking as well... used an old 1 i had laying around...works great. ill pickup a new 1 in a couple days...

i doubt i need 24psi so lets go with 21psi and bpw 111. wont have time tonight so for sure tommorrow

[hammertime371]

btw the fuel pressure measures exactly the same as with air this time.

[hammertime371]

the spring is from mscdirect.com got a bag of 5 for 7$...dont think youll find them any cheaper

[EagleMark]

Amazing what steady pressure will do ay?

[PJG1173]

lol...i work in a factory in a machine shop where i do repair work...fabrication,welding,etc...bla bla bla ...and maintence. so theres lots of spare stuff for all the production machines... i just get to "borrow" whatever i may need!

LOL. I could use a couple extra myself

[hammertime371]

121 psi bpw 111...went back to bin 7 cause i think we pulled timing by mistake.

id swear it runs better when emulating and things set "off for good blms"

[EagleMark]

You still got the same steady fuel pressure today as when log was done?

You have knock counts everywhere, with that bin it is possible some are real, but I'm doubting all of it? That is why I pulled timing from other bin, but you still had knock counts everywhere? But you also had varible flucuating who knows what fuel pressure? Do you have headers? Rattles? Worn motor mount hitting metal? Exhaust hitting? Do you ever hear ping/knock?

What bin was this started with? Now that we have actual fuel pressure I'd rather put together a new bin to start to rule out all these differences I see...

700r4 trans?

[hammertime371]

fuel pressure is holding steady...no change from 21psi

no ac
no air pump
no egr
700r4

I would guess the exhaust is the problem. I patched it last month but i think now i need to replace the 2 tail pipes. 1 did break and is now hanging today. it was not like that when i did the log. motor mounts appear to be good. theres no obvious rattling going on. trucks in decent shape. i can try bin 8 if you want just to see. ive only heard pinging at just off idle occasionally. wot sounds fine and under load uphill sounds fine. no obvious piging.

[EagleMark]

Spent some time watching data and I think with this new VE table you should be good. At least data made sense this time!

I went back to a stock TBI spark table smoothed out for safety sake and see what Knock does? It will be less power but will give us an idea what all these knock counts are for... if they don't go away now it has got to be false knock?

I found some issues in that bin you were using that could cause the cold start popping. This is a ASDU with new VE, spark and all things set were you had them. So when you can do a datalog like usual, but do the batterey disconnect when warm and ready, then start, closed loop, LOG!

[hammertime371]

runs like butt this way! no pinging that i can hear ... exhaust is loud without 1 of the tail pipes! did as you asked and reset ecm , waited for close loop and recorded

[EagleMark]

I'll look at log after church... timing was huge change from Vortec style head to TBI swirl port, but at least we will see what knock is doing now? I know VE table is very close from old log, but if it ran that bad from timing change it may not reflect correct. You could compare old bin spark table and copy paste to newest bin and datalog till I get back...