Konish Posted April 26, 2010 Share Posted April 26, 2010 (edited) Finally, seemingly achieved bliss with my DCOE 45 152s. I was just so darn happy, I had to post a video. Oh, and the finally piece of the puzzle to arrive at this wonderous place? 32mm chokes...that's right, 32mm. I know I've read where experts have stated that you'd never need anything less than 34mm chokes to make the carbs run right. While that may be true (as I didn't try the 34s), the 32s get rid of that wicked lean spot just off idle with the 152s (due to that specific model progression port design). The wideband still shows it, but it just drives so much better on the street. The 36mm chokes would *really* nose-dive and about kill the car unless I slipped the clutch to about 2000-2500 rpm and even then I had to feather the throttle and clutch so it wouldn't buck. 32s? Drive like a normal street car. Until I can get the 4th progression port added by a machinist, it'll have to do. If nothing else, don't believe that 32s won't work and while they may sacrifice top-end, it'll do for now. Here's the "but" part and what made tuning these so damned frustrating. I have an ignition related miss that causes the wideband to read in the 20s (AFR). I can also correlate that to the tach. I took apart my distributor (vacuum advance disabled) and I noticed that one of the teeth on the reluctor ring (rotor) is broken increasing the gap between the stator by quite a bit...say 3X the gap between the rest of them. I also suspect my coil is acting up when it gets warm. So, the plan is to replace the reluctor ring and the coil (not necessarily in that order depending on when I can get parts) to see if I can get the ignition to play nice. Oh, if you noticed the loud tapping...the valves are adjusted...and verified a few weeks later. I think it's the fuel pump arm as it sounds like the tapping is coming from the top of the timing cover. I will say the mic on my phone really makes this louder and higher in freq than it really is. Edited April 26, 2010 by Konish Quote Link to comment Share on other sites More sharing options...
cygnusx1 Posted April 26, 2010 Share Posted April 26, 2010 Nice. Â I have DCOE40's on my 2.8 and just took the 28mm chokes out, and put in 32's also. Â What jetting and aux choke did you end up with? Â Most video cameras are very sensitive in the frequency of L valve noise and makes them sound like crap. Â Quote Link to comment Share on other sites More sharing options...
Sam280Z Posted April 26, 2010 Share Posted April 26, 2010 You should check out this yahoo group. I've been following this guys efforts for the past couple of years as he has experimented with his Weber DCOEs. He has recently had great success with overcoming this flat spot with redesigned idle jets. http://autos.groups.yahoo.com/group/sidedraft_central/ Quote Link to comment Share on other sites More sharing options...
duragg Posted August 26, 2010 Share Posted August 26, 2010 I have Triple DCOE 40s in my 240 with a stock L24. I had them running pretty good a while back, now rebuilding the car. Tell me about your Wideband setup? Somewhere after the headers? What AFRs do you see from idle and at various locations? I put a Wideband on my old Mercedes and made tuning a SNAP!. I was planning one for this car too. TJ Quote Link to comment Share on other sites More sharing options...
Mikez31ss Posted August 26, 2010 Share Posted August 26, 2010 Sounds great to me other than the tap-tap-tap but I hear that in my vids too. So you have a mechanical fuel pump? IIRC you are in Japan. What's the ambient temp there? Quote Link to comment Share on other sites More sharing options...
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