750 cfm Edelbrock tuning 1964 389 - Pontiac GTO Forum
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post #1 of 16 (permalink) Old 10-07-2011, 11:47 AM Thread Starter
 
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750 cfm Edelbrock tuning 1964 389

Anybody tuned a 1411 edelbrock for a mild performance 389? Original heads with rollers, comp 275deh camshaft, .030 over. 10:1 cr. The original carter was fubar'd so i replaced it with the same style. I get a big bog when i blip the throttle (accel pump top hole, 73x47 rods 113 primary jets, orange springs 5"hg). i am looking at changing the springs to pink to get more power circuit. i have to pick up a few different sets of metering rods to fool around with but i was just wondering if anybody had this setup. I also have a EP4B i might try as well.
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post #2 of 16 (permalink) Old 10-07-2011, 03:19 PM
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If you "ease" into the throttle does it still bog, or does it just happen when you hit it quickly?

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post #3 of 16 (permalink) Old 10-07-2011, 03:24 PM Thread Starter
 
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only when i blip the throttle does it do it. if i ease in to it we are good. secondaries also take a second to come on, which is why i was thinking the 7" hg spring to bring the power cicuit in sooner
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post #4 of 16 (permalink) Old 10-07-2011, 05:14 PM
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That sounds to me like an acclerator pump issue, as in not providing a big enough shot to get your engine through the transition point. Other things can cause it too, but that's the most likely.

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post #5 of 16 (permalink) Old 10-07-2011, 05:29 PM
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move the acc pump rod to give it the most movement it can get.
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post #6 of 16 (permalink) Old 10-08-2011, 05:06 AM Thread Starter
 
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Cool. I will check it out. Anybody have a jet/rod combo that I could use as a baseline
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post #7 of 16 (permalink) Old 10-08-2011, 10:21 AM
 
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I have the same problem with my 800cfm on my 455. The accel.pump is set on the middle whole and it still bogs if you hit the throttle hard, if you ease into it fine and great once you hit WOT.

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65 LeMans, 455,TH400, Edelbrock preformer Intake&Carb, K&N Filter, Custom Headers & Dual Exhaust W/ H pipe, 15in ralley wheels...... More to come.
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post #8 of 16 (permalink) Old 10-11-2011, 10:09 AM Thread Starter
 
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I have the same problem with my 800cfm on my 455. The accel.pump is set on the middle whole and it still bogs if you hit the throttle hard, if you ease into it fine and great once you hit WOT.

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I moved my accel pump to the middle hole and seems to work better than the top hole. But I am having serious issues with metering/jetting and its starting to get to me. I got a quadrajet from a friend of mine (78 camaro) that I am going to rebuild (with the help of cliff ruggles book). I hear it is the best performer for the pontiac. I just so pi$$ed at the edelbrock tuning I have almost given up. If anyone has a jet/rod combo that works for their 389 I would greatly appreciate it
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post #9 of 16 (permalink) Old 10-11-2011, 10:17 AM
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Don't feel bad guys --- I recently read a thread over on another Pontiac forum site where the man his-own-self (Cliff Ruggles) spent signficant effort trying to get the bog out of an Edelbrock carb and was unable to do so successfully. That says something, I think

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post #10 of 16 (permalink) Old 10-11-2011, 01:52 PM Thread Starter
 
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I tagged this question on another thread but will a qjet with an adapter work well on the cast iron or ep4b intake? I got a free qjet, mind you it is off of a 78 camaro but fuel inlet loation is not a big deal. With cliffs book and rebuild kit could I turn this into a real performer? Thanks Bear and all others adding thir input to this thread
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