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Old 06-25-2019, 03:25 PM   #16
keith42
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Default Re: powerglide or th400

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Originally Posted by Hutch View Post
Sounds loose with the numbers given. Shift rpm? Any idea where the rpm falls to after the shift? have you tried a converter stall test as much as I hate to ask that question?


Hutch
What's a converter stall test?
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Old 06-25-2019, 03:27 PM   #17
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Default Re: powerglide or th400

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Originally Posted by Cynic View Post
That converter must have a sprag with a stator designed to multiply torque at the higher end of the scale below stall. Like a converter built for 400 pro tree racing because it's not as efficient as typical at the stripe 1/4. Nothing wrong with it, I have one slips a little more but real aggressive at TB release, fast to the shift. This was built specific for 400 pro tree racing.

1/4 mile yours is 14% 7600rpm. The rpm will remain around 7600 because with a shorter the converter will slip a little less.

Good luck
So your saying going with a shorter tire (31") my trap rpm will stay the same? Less slippage by the converter?
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Old 06-25-2019, 03:32 PM   #18
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Default Re: powerglide or th400

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Originally Posted by keith42 View Post
What's a converter stall test?
What does the engine rpm drop back at the shift?
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Old 06-25-2019, 03:33 PM   #19
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Default Re: powerglide or th400

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So your saying going with a shorter tire (31") my trap rpm will stay the same? Less slippage by the converter?
Yes approx.
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Old 06-25-2019, 03:38 PM   #20
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Default Re: powerglide or th400

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What does the engine rpm drop back at the shift?
I'm not sure. I'll have to check next time I'm at the track.
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Old 06-25-2019, 03:39 PM   #21
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Default Re: powerglide or th400

By going to a 31" tire from a 33" tire shouldn't I see a better 60'?
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Old 06-25-2019, 03:42 PM   #22
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Default Re: powerglide or th400

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Originally Posted by keith42 View Post
I'm not sure. I'll have to check next time I'm at the track.
The other way to check the stall, and if this converter does have a sprag you don't wanna do this but one time because it's not good for it, so make it good the first time.

Pull the leave chip, put it in low, push the TB button looking at the tach and deck it wide open. Observe the highest rpm.

Make sure there's nothing in front of the car in case of whatever could go wrong, might.
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Old 06-25-2019, 03:46 PM   #23
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Default Re: powerglide or th400

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By going to a 31" tire from a 33" tire shouldn't I see a better 60'?
Yeah, you're effecting final gearing.
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Old 06-25-2019, 03:49 PM   #24
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Default Re: powerglide or th400

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Originally Posted by Cynic View Post
The other way to check the stall, and if this converter does have a sprag you don't wanna do this but one time because it's not good for it, so make it good the first time.

Pull the leave chip, put it in low, push the TB button looking at the tach and deck it wide open. Observe the highest rpm.

Make sure there's nothing in front of the car in case of whatever could go wrong, might.
6600 rpm
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Old 06-25-2019, 04:01 PM   #25
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Default Re: powerglide or th400

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Originally Posted by keith42 View Post
6600 rpm
If you shift at 7400 rpm plus it should be fine. I could run through a million questions on the engine, it's cam, heads, power etc, etc but this is the short version > Is it stout enough to shift 7400-7600? It's a Reher Morrison I'm pretty sure it is.

I run a 6300 in this car it has a set of out of the box Brodix T1 heads and a 700 Bullet roller cam shifted 7200.

IDK 6600 could be a hair loose but it sounds to me like it needs more gear or shorter tire.


Last edited by Cynic; 06-25-2019 at 04:04 PM.
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Old 06-25-2019, 04:47 PM   #26
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Default Re: powerglide or th400

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Originally Posted by Cynic View Post
If you shift at 7400 rpm plus it should be fine. I could run through a million questions on the engine, it's cam, heads, power etc, etc but this is the short version > Is it stout enough to shift 7400-7600? It's a Reher Morrison I'm pretty sure it is.

I run a 6300 in this car it has a set of out of the box Brodix T1 heads and a 700 Bullet roller cam shifted 7200.

IDK 6600 could be a hair loose but it sounds to me like it needs more gear or shorter tire.

I call B.S.
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Old 06-25-2019, 05:25 PM   #27
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Default Re: powerglide or th400

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Originally Posted by Cynic View Post
If you shift at 7400 rpm plus it should be fine. I could run through a million questions on the engine, it's cam, heads, power etc, etc but this is the short version > Is it stout enough to shift 7400-7600? It's a Reher Morrison I'm pretty sure it is.

I run a 6300 in this car it has a set of out of the box Brodix T1 heads and a 700 Bullet roller cam shifted 7200.

IDK 6600 could be a hair loose but it sounds to me like it needs more gear or shorter tire.

It's a reher morrison 540
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Old 06-25-2019, 05:28 PM   #28
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Default Re: powerglide or th400

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Originally Posted by keith42 View Post
It's a reher morrison 540
Sounds good, what RPM do you shift? What RPM range, is the engine advertised to operate?

Who's converter are you running?

Last edited by Cynic; 06-25-2019 at 05:32 PM.
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Old 06-25-2019, 05:38 PM   #29
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Default Re: powerglide or th400

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Sounds good, what RPM do you shift? What RPM range, is the engine advertised to operate?

Who's converter are you running?
I shift at 7400, talking to Reher Morrison the engine can run at 7800rpm as long as I keep good valve springs in the motor. It's a Hughes converter.
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Old 06-25-2019, 05:49 PM   #30
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Default Re: powerglide or th400

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Originally Posted by keith42 View Post
I shift at 7400, talking to Reher Morrison the engine can run at 7800rpm as long as I keep good valve springs in the motor. It's a Hughes converter.
Ok, so it's a diode converter (sprag-one way clutch) as we presumed. it was probably purposely built for heads up Pro Tree index racing/big tires. 6600 sounds perfect for the RM engine.

Last edited by Cynic; 06-25-2019 at 05:53 PM.
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