700r4 stalls car when put in gear? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 02-27-2013, 02:29 PM
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700r4 stalls car when put in gear?

I have an 82 chevy camaro that had a 305 with a mild cam, the computer in this car has been disconnected and every time I would put it in gear it would die. I replaced the torque converter with a non lockup stock converter and it does the same thing. I now have a 383 with 440 HP and it does the same thing with the same transmission and converter, what is my problem I have been searching everywhere and cannot find anything that fits my problem please help.

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Old 02-27-2013, 03:08 PM
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I also have a vacum canister on the car and all new vacum lines.
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Old 02-27-2013, 04:13 PM
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A stock low stall 12" diameter converter will not work with a cammed up motor.

What cam?

what is the idle base timing?
What converter stall?
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Old 02-27-2013, 05:41 PM
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With all the work you have done, It is hard to believe you are having a problem.

If it all works except the car dies when you put it in gear, I would think the idle is to low and when you put it in gear its drop the idle more and stalls out the car.
Also vacuum leaks or miss routed vacuum lines would show these symptoms.

Or maybe a combination of idle and to retarded timing..

What does it do if you hold the idle up while shifting into gear
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Old 02-27-2013, 05:57 PM
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If you are depending heavily on vacuum advance for the idle timing, the timing drops when you go in gear.
This makes the motor stall. The cure is to recurve the distributor for more initial base timing at idle that does not change when you are idling in gear. For a hi perf cam 24 to 26deg base initial at idle and use ported vac advance.

Requires that you limit the mechanical advance to 10deg of travel.

26deg at idle +10deg mech advance ='s36deg at max advance.

Fix the distributor
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Old 02-27-2013, 06:34 PM
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Quote:
Originally Posted by F-BIRD'88 View Post
A stock low stall 12" diameter converter will not work with a cammed up motor.

What cam?

what is the idle base timing?
What converter stall?
Stock converter, not sure what cam it's a lunati trying to get the spec sheet from the motor builder, 38 btdc
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Old 02-27-2013, 06:38 PM
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It idles around 1000 rpm
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Old 02-27-2013, 07:05 PM
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And what happens to the timing when idling in gear?
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Old 02-27-2013, 07:10 PM
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Quote:
Originally Posted by F-BIRD'88 View Post
And what happens to the timing when idling in gear?
It won't idle in gear
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Old 02-27-2013, 07:14 PM
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Again what happens when you hold the idle up when put it in gear

Does it drag / bog the motor down. Like the tranny is engaged and lowering the RPM's and trying to move the car ?

I am not sure what the stall of a shock converter is, but the motor might be idling at a higher RPM than the converter can handle..
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Old 02-27-2013, 07:16 PM
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It try's to take off and dies when put in gear unless you give it gas
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Old 02-27-2013, 07:20 PM
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That leads me to believe the idle is higher than the stall on the converter. Which makes the trans engage and is putting a drag on the engine.

I would try to lower the idle first before I went and bought a converter with a higher stall.

I imagine you trying to drive your beast down the street and having to hold the brake and gas just to keep it running..Lol the guys next to you must be all like...This guy is crazy trying to power brake here on the streets... Lol
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Old 02-27-2013, 07:52 PM
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You need a high stall and the distributor advance curve is wrong for the cam.

get a high stall converter based on a smaller 245MM diameter converter.
If you want to go fast get a 3500+ stall lock up converter for your th700r4

If you are depending on vacuum advance at idle the timing is going to drop off, when in gear.

What is the initial base timing at idle when the vacuum advance is unplugged and
you slow the idle speed from 1000 rpm. ? What is the manifold vacuum at 1000 rpm?
what is the timing at 700rpm? What is the manifold vacuum at 700rpm? No vacuum advance.
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Old 02-27-2013, 08:07 PM
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i have a hughs 3400 stall converter sittin in my shop. n the stall on that stock converter is 2100. by the way what ratio u running in the rearend?
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Old 02-28-2013, 08:35 AM
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Quote:
Originally Posted by tboneb4a View Post
i have a hughs 3400 stall converter sittin in my shop. n the stall on that stock converter is 2100. by the way what ratio u running in the rearend?
Right now it just has the stock 3:73 rearend
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