Bog/stumble off the line

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Re: Bog/stumble off the line

Post by bracketchev1221 on Mon May 15, 2017 7:32 pm

4000+ lbs, no gear and low torque does not make for a tire smoker. You probably have a 28" tall tire too?
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Re: Bog/stumble off the line

Post by JF74chevelle on Mon May 15, 2017 7:44 pm

vacuum secondaries. How it works is like this. There is an airdoor at the top of the secondaries. Once the lower butterflies open (they are hooked to the primaries mechanically) air demand builds on the air door.
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Re: Bog/stumble off the line

Post by JF74chevelle on Mon May 15, 2017 7:44 pm

[quote="bracketchev1221"]4000+ lbs, no gear and low torque does not make for a tire smoker.  You probably have a 28" tall tire too?[/quote

295/50r15 on the rear believe it's 26"
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Re: Bog/stumble off the line

Post by Joe73 on Mon May 15, 2017 8:11 pm

Sounds like you need to adjust when the secondaries kick in. They sound like theyre opening too quick causing your bog.

I like to run holley carbs with the quick change spring kit. It comes with multiple color springs which designates how stiff they are. You keep putting in a stiffer spring until she bogs when you punch it. Then put in the next size "lighter" spring. No more bog. Actually pretty simple procedure.
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Re: Bog/stumble off the line

Post by JF74chevelle on Mon May 15, 2017 8:55 pm

I would like a Holley but the edelbrock is what I have at the moment.
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Re: Bog/stumble off the line

Post by Joe73 on Mon May 15, 2017 8:57 pm

Find out how to adjust the secondaries. There has to be a way. I think you need to make it one step tighter on its tension. That should cure the bog.
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Re: Bog/stumble off the line

Post by bigredlaguna on Mon May 15, 2017 10:04 pm

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Re: Bog/stumble off the line

Post by JF74chevelle on Tue May 16, 2017 2:23 pm

I'll try to adjust my secondaries, I don't think mine adjusts like that though.
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Re: Bog/stumble off the line

Post by bracketchev1221 on Tue May 16, 2017 5:17 pm

What happens if you are cruising along at 1000-1200 rpm in 4th gear and stomp on it?
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Re: Bog/stumble off the line

Post by JF74chevelle on Tue May 16, 2017 6:57 pm

bracketchev1221 wrote:What happens if you are cruising along at 1000-1200 rpm in 4th gear and stomp on it?
I haven't tried that I'll give it a try
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Re: Bog/stumble off the line

Post by JF74chevelle on Tue May 16, 2017 7:27 pm

Here's the thing, I never had a bog with the th350 in. And with the manual I do have a bog even before changing out the step up springs, acc pump and moving the linkage. So that makes me think it isn't the carb but the rear gears
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Re: Bog/stumble off the line

Post by Joe73 on Tue May 16, 2017 8:02 pm

An automatic would have some slippage with the torque converter and such. Emmanuel has direct connection with the clutch. And it automatically downshift to accommodate the extra power
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Re: Bog/stumble off the line

Post by bigredlaguna on Tue May 16, 2017 9:33 pm

Here is a thread from another forum about various tuning issues with the 1406 Edelbrock. The first post may be of interest to you.

http://vb.foureyedpride.com/showthread.php?74438-Trouble-Tuning-the-Edelbrock-Performer-1406-Carb-Read-On
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Re: Bog/stumble off the line

Post by JF74chevelle on Tue May 16, 2017 10:01 pm

I e read through that one and it was very interesting
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Re: Bog/stumble off the line

Post by JF74chevelle on Wed May 17, 2017 9:39 am

bracketchev1221 wrote:What happens if you are cruising along at 1000-1200 rpm in 4th gear and stomp on it?

I held it at 1000rpm in fourth punched it to the floor, no bog, but very anticlimactic lol. I moved the accelerator pump linkage back to the middle hole we'll see how that goes.
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Re: Bog/stumble off the line

Post by Joe73 on Wed May 17, 2017 10:30 am

No bog, thats good.

I think everything is fine. Just need more rpms. Your manually doing the job an automatic would normally do.
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Re: Bog/stumble off the line

Post by JF74chevelle on Wed May 17, 2017 10:58 am

Thank you for all of your help guys, it really makes it easier to work on the car and learn which is some of the most fun
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Re: Bog/stumble off the line

Post by bracketchev1221 on Wed May 17, 2017 2:56 pm

Well to me if you can do the fourth gear test it's not carb related.
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Re: Bog/stumble off the line

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