choke adjustment on 7747

[hammertime371]

ordered regulator... should be in tommorrow

[hammertime371]

used another pressure guage and now it reads good again...wtf...anyway did log with 24-25 psi with bpw 106.. forgot to hook up wb so we can deal with that later

[hammertime371]

if i hold the throttle at 1600rpms it feels rough while in park. the wide band bounces from 16 - 18. must be lean around 1400 to 1800. at idle it stays around 14-15 on the wb

[hammertime371]

the knock counts are down a lot since the last log

[hammertime371]

theres still something wrong...anytime i hit the gas quick from idle it misses and backfires. slow rev is great. pump shot seems to be off. still get varying fuel pressures so thats not helping. I plan to add a regulator with a bypass built in. install it on the supply side of tbi and connect return line to regulator, then block off the regulator diaphram with a flat plate and gasket. then make a plug for the return side of tbi. this way im sure to get the right pressure all the time. idle is also acting weird, not smooth like it was. backfires thru the carb

[EagleMark]

Log is doing weird things as well? Without consistent fuel pressure it's hard to run consistent...

[hammertime371]

...so what you think about the regulator idea?

[EagleMark]

I've seen people do it, but I have never found a need?

theres still something wrong...anytime i hit the gas quick from idle it misses and backfires.

At that pressure this should not happen.

still get varying fuel pressures so thats not helping.

This is a major issue!

idle is also acting weird, not smooth like it was. backfires thru the carb

Again should not happen at this pressure, you are rich at idle...

What ever it takes to get a steady fuel pressure is what is needed. New spring and diaphram should be all that is needed with your adjustment. Not sure your dual spring is working properly? Good idea, bad results... you were closer before...

I'm going to install the fuel and spark tables into a new bin, I've seen some differnces from ASDU when I compare in there and don't know what bin you started with? What bin did you start with?

[gregs78cam]

Are you using a liquid filled pressure gauge?

[hammertime371]

Im using ANLW bin

I have a liquid filled guage and non filled as well. been juggling several.

I agree the duel spring may not be good. Its odd how it worked great for 1 day. thats when you said i was in the ball park. I did order 2 more springs to try that fit like stock. They should have been in today but no luck. The regulator was a bust as it only went to 12 psi. the stores listing says it goes to 50 but they were wrong. returned that and now just waiting for new springs. if they dont work right then ill order another regulator. Ill get it right one way or another.

[EagleMark]

Usually the liquid filled are more stable, but then a quality gauge would be stable?

[hammertime371]

so what would bpw be at 24psi. im guessing about 104.

[EagleMark]

103.4 bpw

[hammertime371]

ahh now i can do it myself! thanks!

[EagleMark]

But with all the issues you have had with varying fuel pressure I hope we did not overshoot what was needed once you get a steady pressure? One data log with steady pressure will tell, you can always go down right?