Dynamometer Results & Comparisons Dyno Records | Dyno Discussion | Dyno Wars

locked vs unlocked

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Old Aug 21, 2006 | 09:48 PM
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Default locked vs unlocked

Roughly how much of a difference does it make to dyno an A-4 car with the TC locked vs unlocked?
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Old Aug 21, 2006 | 10:05 PM
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It really depends on the type of converter.

Below are my old converters and friends converters. I listed the hp difference between locked and unlocked


vig 3200 -------------- 15 hp
Yank pt4000 ---------- 20 hp
vig 3800 -------------- 40 hp
TCS 3200 ------------- 27 hp
Yank ss 3800 ---------- 23 hp

I hope that helps
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Old Aug 21, 2006 | 10:25 PM
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Thanks it does give me some hope. I am just really bummed that I could't even crack 300 but it was unlocked.
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Old Aug 21, 2006 | 10:39 PM
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TCI 4400 - 29 rwhp

The larger the speed usually the higher the loss, all depends on the brand, etc.
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Old Aug 23, 2006 | 09:17 PM
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I went from 416 locked to 382 unlocked with an SS4000 ..
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Old Aug 25, 2006 | 11:01 PM
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So I could say that with my 4K I was at least 20HP off being unlocked right?
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Old Aug 26, 2006 | 07:14 AM
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[QUOTE=kruthes1]Thanks it does give me some hope. I am just really bummed that I could't even crack 300 but it was unlocked.[/QUOTE

My first time on the dyno with the same boltons you have plus a ported throttle body I dynoed 300 at the wheels through a unlocked vig 3600.
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Old Aug 26, 2006 | 07:56 AM
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Ijust had my car dynoed it has lthedders ory,lid,flo-mouth,TCI34-3800 stall and put aTR224/112 cam it only did 316 unlocked.My shop retuned it and put in anew map sensor and we'll see in one wk on are next dyno appointment what it does and if we can get it to lock
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Old Aug 26, 2006 | 08:58 AM
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I've done some searching and can't quite get this sorted out.

I had always assumed that the converter is locked @ or near it's stall rating. Can a the converter be controlled through the computer? If running on a dyno locked and unlocked is an option, what would be the purpose of running unlocked vice locked when setting peak performance / WOT?
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Old Aug 26, 2006 | 09:51 AM
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From: ct.
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On the dyno you ussaually lock the converter through the computer while tuning.
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