thoughts on locking up a high hp combo on the dyno?
Thread Starter
TECH Senior Member
iTrader: (2)
Joined: Nov 2001
Posts: 9,971
Likes: 2
From: Tampa Bay
thoughts on locking up a high hp combo on the dyno? just wanted to get some of your thoughts and concerns on locking up a higher hp combo. gonna dyno tune a 550-600 rwhp combo on the dyno soon. it is a blown lt1 with a 4L60e setup and a yank pro extreme convertor. are we risking burning up the convertor for a few dyno pulls? what rpm should i lock up the convertor? 5500 rpms? TIA!
TECH Enthusiast
Joined: Jul 2002
Posts: 611
Likes: 0
From: Austin, TX
Originally Posted by gator's 99TA
so what colonel is saying is dyno at part throttle? i thought all dynos were done wot?
no he means lock the converter at part throttle then go wide open throttle to dyno...
get it into 3rd gear, lock the converter, go wot to dyno
do not...
go wot and then lock the converter during the pull
Trending Topics
TECH Senior Member
Joined: Nov 2001
Posts: 9,246
Likes: 3
From: Troy, AL
Right. 
The posi-loc clutch is designed to add some coupling pressure when the input shaft sees better than 450 ft/lbs of TQ (and thus this added coupling will lessen as the TQ falls.) That is NOT the same thing as locking the converter. You still need to manually lock the converter on the dyno even with a posi-loc clutch.
The posi-loc clutch is designed to add some coupling pressure when the input shaft sees better than 450 ft/lbs of TQ (and thus this added coupling will lessen as the TQ falls.) That is NOT the same thing as locking the converter. You still need to manually lock the converter on the dyno even with a posi-loc clutch.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
TECH Fanatic
Joined: Mar 2002
Posts: 1,044
Likes: 0
Originally Posted by Colonel
Right.
The posi-loc clutch is designed to add some coupling pressure when the input shaft sees better than 450 ft/lbs of TQ (and thus this added coupling will lessen as the TQ falls.) That is NOT the same thing as locking the converter. You still need to manually lock the converter on the dyno even with a posi-loc clutch.
The posi-loc clutch is designed to add some coupling pressure when the input shaft sees better than 450 ft/lbs of TQ (and thus this added coupling will lessen as the TQ falls.) That is NOT the same thing as locking the converter. You still need to manually lock the converter on the dyno even with a posi-loc clutch.
SC-
Colonel, you had mentioned a while back you set
up to have the TCC lock at the top of 3rd for a
little more time-in-gear at the end of the 1/4.
I tried this on mine and it made some not-too-
happy noises. Are there converters you have had
to -not- do power clutch applies, or ones you
have found just won't hold against max output
and have to be "given up on"? Just wondering,
maybe mine is still sore from feeding it B&M fluid
in its youth.
up to have the TCC lock at the top of 3rd for a
little more time-in-gear at the end of the 1/4.
I tried this on mine and it made some not-too-
happy noises. Are there converters you have had
to -not- do power clutch applies, or ones you
have found just won't hold against max output
and have to be "given up on"? Just wondering,
maybe mine is still sore from feeding it B&M fluid
in its youth.
TECH Senior Member
Joined: Nov 2001
Posts: 9,246
Likes: 3
From: Troy, AL
Jimmy, I made that programming change back when I had the TCI3500. I only drove it all the way into lockup a handful of times (the top of 3rd is pretty fast with 3.23 gears. 6300 RPM with the converter locked in 3rd is about 150 MPH!!!) but the converter didn't do anything strange. I later swapped that converter for the SS4000. It too seems to handle the WOT lockup just fine but again, it's not something I do very often simply because of the speed involved in reaching lockup.
It might help that I have the TCI shift kit and run F-type fluid, I dunno.
It might help that I have the TCI shift kit and run F-type fluid, I dunno.
That's plenty high, all right. You know, I never tried
to raise the 3-4 shift point above 125MPH just because
the Predator would never let me. I thought maybe there
was some PCM limit to it. I will have to see what HPTuners
will let me get away with.
to raise the 3-4 shift point above 125MPH just because
the Predator would never let me. I thought maybe there
was some PCM limit to it. I will have to see what HPTuners
will let me get away with.