Torque converter lock up on dyno question
Thread Starter
Race Director
Joined: Oct 1999
Posts: 17,710
Likes: 1,219
From: Phila PA, Bonita Springs FL
Torque converter lock up on dyno question
What amount of HP should you see when the TC is locked on the dyno?
What does it mean if it gets a small amount of gain, say 10-15 HP, and conversley, what does it mean if you gain say, 20-25 or more HP??
Thanks..
What does it mean if it gets a small amount of gain, say 10-15 HP, and conversley, what does it mean if you gain say, 20-25 or more HP??
Thanks..
Drifting
Joined: Nov 2001
Posts: 1,791
Likes: 0
From: NE PA
Originally Posted by YO-EL
What amount of HP should you see when the TC is locked on the dyno?
What does it mean if it gets a small amount of gain, say 10-15 HP, and conversley, what does it mean if you gain say, 20-25 or more HP??
Thanks..
What does it mean if it gets a small amount of gain, say 10-15 HP, and conversley, what does it mean if you gain say, 20-25 or more HP??
Thanks..
I very recently had my car retuned with the following results. My Yank 3000 is a relatively small, efficient converter.
Converter Unlocked: 376 rwhp and 349 rwtq
Converter Locked: 392 rwhp and 367 rwtq
Last edited by XTrooper; Oct 17, 2004 at 10:26 AM.
Safety Car
Joined: Aug 2000
Posts: 4,154
Likes: 1
From: Murphy TX
Cruise-In II Veteran
Assuming locked means the TCC has been commanded on, the difference could be interpreted as showing the efficiency of the converter with greater differences being less efficient and smaller differences being more efficient. That does make one big assumption though, namely that your TCC being locked is "maximally efficient." Suppose for example you saw a very small change. Does that mean your converter is very efficient or does it mean that your converter doesn't lock up very well? Or hasn't stayed locked, or... Hmmm... The difference in the shape of the curves can help you decide.
Supporting Vendor
Joined: Feb 2000
Posts: 7,302
Likes: 1
From: Los Angeles, CA
St. Jude Donor '03-'04-'05-'06
YO-EL,
Do you have access to a GM Tech 2? When we dyno GM A4 cars, we hook up the Tech 2, lock up the TC and then run the car. The dyno results are much more accurate that way. On the dyno, it is more difficult to get accurate numbers on an A4 because if the tranny shifts before you can get a smooth transition run, the numbers will be way off.
Shawn
Do you have access to a GM Tech 2? When we dyno GM A4 cars, we hook up the Tech 2, lock up the TC and then run the car. The dyno results are much more accurate that way. On the dyno, it is more difficult to get accurate numbers on an A4 because if the tranny shifts before you can get a smooth transition run, the numbers will be way off.
Shawn
Thread Starter
Race Director
Joined: Oct 1999
Posts: 17,710
Likes: 1,219
From: Phila PA, Bonita Springs FL
Guys..
I lost 2/10 after a new tranny & converter install.
The converter was the same model as I had before.
My 60' were way up at the track.
On the dyno I lost 10 HP, but when they locked the converter it gained 26 HP.
It that normal for a 3600 stall?
I was told its not. Very inefficient, possibly bad stator, & due to the soft hit, a very low STR.... Locked converter should be max 10-15 HP..
Right?
I am in the process of swapping converters to see what happens..Will report after a track visit this week... But from what I can "feel", this different converter hits way harder, and now the tranny shifts firmer.
Could a bad or inefficient converter be eating up the shifts, making them feel soft as well as the light hit off the line?
I lost 2/10 after a new tranny & converter install.
The converter was the same model as I had before.
My 60' were way up at the track.
On the dyno I lost 10 HP, but when they locked the converter it gained 26 HP.
It that normal for a 3600 stall?
I was told its not. Very inefficient, possibly bad stator, & due to the soft hit, a very low STR.... Locked converter should be max 10-15 HP..
Right?
I am in the process of swapping converters to see what happens..Will report after a track visit this week... But from what I can "feel", this different converter hits way harder, and now the tranny shifts firmer.
Could a bad or inefficient converter be eating up the shifts, making them feel soft as well as the light hit off the line?
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