Dynamometer Results & Comparisons - locked vs unlocked

any one know exactly how much whp you gain from an unlocked run to a locked run. :confused:

Depends on the torque converter. On a stock cam with a stock engine, it might be 10 rwhp difference. But if you're running a Vig 3600 and a heads/cam engine, it might be 40 rwhp difference. Some converters are more efficient than others.

on my ta i was loosing over 55rwhp thru the converter on a vig 3600

all i have to say is wow, im running A YANK SS3600. i dyno'd 389 on a mustang unlocked. so your sayn i could be at around 430-440 on that dyno. thats redic.

unlocked 8" converters are not good for dyno numbers. ;) Trust me.

all i have to say is wow, im running A YANK SS3600. i dyno'd 389 on a mustang unlocked. so your sayn i could be at around 430-440 on that dyno. thats redic.

I have an SS3600 and when I was putting down 404hp unlocked, it only made 409 locked. Yank SS converters are very efficient.

ok that makes a little bit more sense. 5whp is nothing to really complain about but 40-50 is like wtf.

I had a SY3500 locked to unlocked was only 6whp difference
Now I have SS4000 locked to unlocked is a 43whp difference

ok that makes a little bit more sense. 5whp is nothing to really complain about but 40-50 is like wtf.



yeah man, i wasnt making good numbers on the TQ on my car. i made 395 rwhp and 345 on TQ. im running a VIG 3200.

i would like to know about this as well. from how i understand it, yank PT converters are the way to go if you will be NA and do not want to lock your converter. i have been told by several people that the yank ss and the vig converters will not be as efficient as the PT series.

the thruster yanks are very efficient, mine claims something like 98%... I would also like to add, is there not a risk running locked in 3rd gear at WOT? as far as the lockup clutches etc... i run a yank TT 3000, which is a torque thruster, high STR ultra efficient... according to yank that is

Why worry about it... autos aren't gonna be dyno queens so just use the dyno for tuning and the track to verify results. Locked numbers are worthless because it isn't gonna be locked when you are racing. Take it to the track and post up!

I had a SY3500 locked to unlocked was only 6whp difference
Now I have SS4000 locked to unlocked is a 43whp difference

If you are loosing 43 hp on that ss4000 Id say that is a broken converter. I actually just installed the ss4000 in my car and if i see over a 25 hp drop ill toss it threw yanks window after writing f-u DAVe on it. My PT4000 only difference is 18-20 hp locked to unlocked. I cant see the ss4000 being that bad.

Why worry about it... autos aren't gonna be dyno queens so just use the dyno for tuning and the track to verify results. Locked numbers are worthless because it isn't gonna be locked when you are racing. Take it to the track and post up!

you are 100% correct, although i used to lock up the converter in third gear and i actually picked up 3-4 mph.

If you are loosing 43 hp on that ss4000 Id say that is a broken converter. I actually just installed the ss4000 in my car and if i see over a 25 hp drop ill toss it threw yanks window after writing f-u DAVe on it. My PT4000 only difference is 18-20 hp locked to unlocked. I cant see the ss4000 being that bad.


Although it showed a loss on the dyno there is nothing like track times.
It murders on the street and trapped about 1mph faster and ets went down too. It is a way different converter than my old 3500.

Although it showed a loss on the dyno there is nothing like track times.
It murders on the street and trapped about 1mph faster and ets went down too. It is a way different converter than my old 3500.

Glad to hear it. Yanks usually deliver.

The looser the converter, the more hp it soaks up on the dyno.
I've seen 4000 rpm converters soak up almost 40 hp unlocked vs locked. They're not broken, just acting like a big sponge.

thanks edc

PT4000 converter here. 459 unlocked. 483 locked on my stock bottom end combo.

PT4000 converter here. 459 unlocked. 483 locked on my stock bottom end combo.

what are your shift points set at?

its 3 with a yankss3600

Why worry about it... autos aren't gonna be dyno queens so just use the dyno for tuning and the track to verify results. Locked numbers are worthless because it isn't gonna be locked when you are racing. Take it to the track and post up!

Exactly! Don't get the hang up with this.

BTW, I ran a Yank PY3400 and dynoed 402RWHP (unlocked) and ran 12.17, changed to a Yank 4000SS and dynoed 372 RWHP (unlocked) and went 11.51:chug:

Autos and 9" Fords eat HP, but worked very well at the drags.

I lost 24rwhp through a vig3200

438rwhp locked
414rwhp unlocked

:)

You have to keep the locked vs unlocked numbers in perspective. The HP isn't really lost, it's just hiding from the dyno :D

For example, I had my car dyno tuned when it had a lid, SSRA, LT's, ORY, ported TB, dynomouth and a TCI SSF3500 stall. I dynoed 298 rwhp unlocked. That's worse then many stock LS1's dyno. But locked I made around 325 rwhp which is much more in line with what a full exhaust ls1 should make.

With that setup I ran 12.3 @ 109 at the track. 298 rwhp full weight LS1's trap around 104-105 NOT 109. But 325 rwhp LS1's can and do trap 109. So the HP is still there when you need it most. It just doesn't make it on the dyno.

My car dyno'd 322RWTQ and 318 RWTQ with my Vig 3600(4000 converter in reality) unlocked

Never had a chance to dyno it locked I would guess it would be around 345-355RWHP~ Locked

Car ran 12.08-12.15@108.5 @+1500 DA Consistantly