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post #1 of 42 (permalink) Old 05-06-2011, 03:49 PM Thread Starter
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Pre-loading the Torque Converter

A friend and I were discussing the other day racing techniques when we can around to loading the torque converter at the line. I find myself always maxing my converter out at 2k rpm however my friend with a 2800 stall says that the car has better response at a pre load of about half or so. Is there any evidence which is the best way to pre-load a converter? Is max stall best or half stall?

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post #2 of 42 (permalink) Old 05-06-2011, 03:59 PM
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The rule I have made that seems to work is the smaller converter the more you want to preload it. 12 inch converters, flash them off idle. 11 inch converters, flash them by holding th emotor just off idle. 10 inch converters like half load and 9.5-9 inch converters hold them for all they are worth.
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post #3 of 42 (permalink) Old 05-06-2011, 04:52 PM
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post #4 of 42 (permalink) Old 05-06-2011, 05:58 PM
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Like so ...

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post #5 of 42 (permalink) Old 05-06-2011, 06:48 PM
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post #6 of 42 (permalink) Old 05-07-2011, 02:53 PM Thread Starter
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The rule I have made that seems to work is the smaller converter the more you want to preload it. 12 inch converters, flash them off idle. 11 inch converters, flash them by holding th emotor just off idle. 10 inch converters like half load and 9.5-9 inch converters hold them for all they are worth.
Alan
I like the rule. Ok so I am clear on this, the Mark VIII converter that is in my car is a 10 inch correct? So I should hold it at about 1000 rpm for the best pre-load launch. Is the Marauder also a 10 inch? I recently pick one up to go with my PI Teksid set up.

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post #7 of 42 (permalink) Old 05-07-2011, 04:19 PM
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MarkVIII and marauder converters are 11.25 inch.
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post #8 of 42 (permalink) Old 05-07-2011, 04:31 PM
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I was surfing car porn on YouTube and happened to run across this classic from last fall at the SuperCoupe Shootout in Xenia, OH...

http://www.youtube.com/watch?v=VzZYfGmM36s

I think the car wants more stall at the line.

For the record, that was the finals of the bracket series for the day and the Blue Flame victoriously pulled into the pits with a flat tire after that final run.
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post #9 of 42 (permalink) Old 05-07-2011, 04:35 PM Thread Starter
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MarkVIII and marauder converters are 11.25 inch.
Alan
I see, I thought the Tbird had an 11inch and the Mark had a 10 inch but I see I was wrong. What would you recommend an 11 inch or a 10?

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post #10 of 42 (permalink) Old 05-07-2011, 04:47 PM
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post #11 of 42 (permalink) Old 05-07-2011, 04:54 PM
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That is the real question, the people replying in this thread are going to suggest much more than you probably even imagined, myself included.
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post #12 of 42 (permalink) Old 05-07-2011, 05:26 PM Thread Starter
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Well I was thinking of like a 3000 stall. I don't see too much of a reason to go above that. I would like my car to 60ft at around 1.6 or 1.7

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post #13 of 42 (permalink) Old 05-07-2011, 06:24 PM
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You'll need 3,800 stall, very sticky tires and a lot of HP to do that; my 60's are 1.6 and 1.7

Stall alone won't get you to 1.6 or 1.7

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post #14 of 42 (permalink) Old 05-07-2011, 06:33 PM
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You'll need 3,800 stall, very sticky tires and a lot of HP to do that; my 60's are 1.6 and 1.7

Stall alone won't get you to 1.6 or 1.7
yup...high stall converters and cheap wal-mart tires dont mix...unless your going for smoke instead of speed

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post #15 of 42 (permalink) Old 05-07-2011, 07:05 PM
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Well I was thinking of like a 3000 stall. I don't see too much of a reason to go above that. I would like my car to 60ft at around 1.6 or 1.7
Exactly as I figured it would be. 3000 stall is not going to get you those times.
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post #16 of 42 (permalink) Old 05-07-2011, 07:19 PM Thread Starter
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You'll need 3,800 stall, very sticky tires and a lot of HP to do that; my 60's are 1.6 and 1.7

Stall alone won't get you to 1.6 or 1.7
I know a stall alone wont get me that 60 ft. I have a set of gears for it (4.56's) and will be ordering the driveshaft best suited for the gears. When the car is running I was planning on running MT ET streets to hold down the power of the PI teksid. I am hopping to see in the area of 400whp with a 100 wet shot, but thats just hopes.

If you are running 1.6/1.7's then perhaps I should set my standards lower. The best I 60 ft before in the T-bird was 2.19 on street tires.

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post #17 of 42 (permalink) Old 05-07-2011, 07:41 PM
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So you want to run 4.56 gears and a 3000 stall converter. I would think that through. 3.27 gears or 3.55's would be a closer mate to a 3000 stall. For 4.56 gears I would be suggesting 4600ish.
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post #18 of 42 (permalink) Old 05-07-2011, 07:49 PM Thread Starter
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So you want to run 4.56 gears and a 3000 stall converter. I would think that through. 3.27 gears or 3.55's would be a closer mate to a 3000 stall. For 4.56 gears I would be suggesting 4600ish.
Alan
May I ask why? This is a new concept to me so please help me understand.

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post #19 of 42 (permalink) Old 05-07-2011, 08:16 PM
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Because you have to mate the components together to work correctly. For example if you put a 4200 stall in a car with 3.08 gears it will be slipping and making heat any time it is not being run wide open or locked up. The rpms will be below the converters range.
Going the other way isn't going to make those problems but it will not optimize performance. 4.56 gears in an 8.8 scare me with the small pinion anyway. The stall will never produce the results you want doing it that way.
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post #20 of 42 (permalink) Old 05-10-2011, 07:36 AM
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so alan with my 9.5 inch torque converter I should hold it as tight as I can to get the best launch? I normaly hold it to about 1400 and then punch it. 3150 stall.
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post #21 of 42 (permalink) Old 05-10-2011, 08:40 AM
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yall should go to the track and try stalling your car at diffeent stall speeds, and see what nets you the best 60 foot.
I did, and it seemed for a stock truck stall in my C6, was around 2,000 rpm's.
which netted me 1.88 60's.
anything less, and the 60's would go up.

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post #22 of 42 (permalink) Old 05-10-2011, 10:53 AM
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so alan with my 9.5 inch torque converter I should hold it as tight as I can to get the best launch? I normaly hold it to about 1400 and then punch it. 3150 stall.
Doesn't hurt to try different things to find what works best.
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post #23 of 42 (permalink) Old 05-10-2011, 11:01 AM
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I don't remember what I did exactly on my runs back in November, but I think I got my best 60' time by holding the motor at 1200 RPM and launching from there.

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post #24 of 42 (permalink) Old 05-12-2011, 09:34 PM
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I can't remember what Alan set the stall at in my 10" converter, but I've run my best 60' times by bringing the rpm's up to ~1500, then flat-footing it on the third amber.

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post #25 of 42 (permalink) Old 05-12-2011, 09:44 PM
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[QUOTE=Trunk Monkey;1372350]Like so ...

I plan on shooting a better (higher quality) version of this video this summer. Stay tuned!

You need more gas in your tank Mine runs slower time's under a half a tank.

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post #26 of 42 (permalink) Old 05-13-2011, 08:00 AM
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Practice is your friend. Also you need to know your goals....

When I am going for best et, I launch at 2500-2700 RPM.

When I am going for consistency and RT, I launch right at 2200 RPM.

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post #27 of 42 (permalink) Old 05-13-2011, 11:44 PM
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post #28 of 42 (permalink) Old 05-19-2011, 01:28 PM
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Like so ...

I plan on shooting a better (higher quality) version of this video this summer. Stay tuned!

I'm surprised you are able to do that with only an 1/8 tank of gas. I have to have a minumum of 1/3 tank or it starts sucking air and bucking from fuel starvation on the 2nd half of the track.

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post #29 of 42 (permalink) Old 05-19-2011, 01:36 PM
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I'm surprised you are able to do that with only an 1/8 tank of gas. I have to have a minumum of 1/3 tank or it starts sucking air and bucking from fuel starvation on the 2nd half of the track.

David
sounds like you need a sumped tank, or its time to go to a cell.

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post #30 of 42 (permalink) Old 05-19-2011, 03:23 PM
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I'm surprised you are able to do that with only an 1/8 tank of gas. I have to have a minumum of 1/3 tank or it starts sucking air and bucking from fuel starvation on the 2nd half of the track.

David
I've never had a problem running a quarter to an eighth of a tank.

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