ls1650

hey guys i was just wondoring if or has anyone lost hp when they added a torque converter? i see many guys pushing around 370-380rwhp with a stall thats 3000+. correct me if im wrong but do you really lose hp when you add a stall? if you do, how much do you lose?

NICKZ28

You will lose some. Not much though. It all depends on the effeciency of the converter and what stall speed you get. The loss is more than made up for in the reduction in ET you'll get from a higher stall converter.

Yank

iTrader: (181)

Here is a test showing our st2600 and ss3200 to the stock converter
you can see that a gain in HP (bigger with the ss3200) over the stock converter not a loss!
this is a Yank converter test at WOT in 3th gear with 3.73 from a dead stop

Detroitmuscle

iTrader: (16)

Look at my numbers in sig. I figure I should be closer to 300rwhp but with the stall I don't even break 280hp. Still feels a hell of a lot faster though and its well worth it with better e.t.

ls1650

i guess overall what matters is who winz the 1/4 mile from the start to the end. who ever has the best launch and better traction i suppose would win.

s346k

iTrader: (4)

you lose no hp through the stall. it might show lower numbers on a dyno because of converter slippage, but your trap speeds at the track will remain the same if not increase...which proves that you haven't lost horsepower.

The Sad

iTrader: (8)

I'm a little confused by this. This is showing an increase in torque (not HP) and isn't it just from flashing the converter?

Yank

iTrader: (181)

from 750 to 4250 blue line and from 750 to 2850 on the red line is the STR at work, after that point the design efficiency rate will take over till you reach max RPM
the numbers on after Torque mult. stage are the true power that is passing thru the converter.

WILWAXU

iTrader: (6)

If you 'race' dyno numbers you might loose a little. But in real performance there isn't a comparision.

MattZ28

iTrader: (4)

I went from 13.2 @ 105 1.92 to 13.1 @ 102 1.80-1.84 60' with a 3200 Pro Torque 10.5" converter. I also added an aluminum driveshaft so I don't understand

radz282003

iTrader: (1)

I had a loss of 40 RWHP between locked and unlocked. The car feels WAY better though. All of my A4 buds LOVE how the car feels and swear I have more mods' than what I do, just from the converter. From what I understand, like was said before, bench racing dyno sheets isn' t necessarily a reflection of the benefit of a TC.

Just my .02

The Sad

iTrader: (8)

That makes a little more sense. So are you saying that by putting a converter in his car, ls1650 will gain HP? I don't see how a converter changes the amount of air/fuel the engine is able to burn

A converter is lighter, so the engine will accelerate easier/quicker. And the converter will allow the engine to spend more time in the powerband so the car is quicker. Both give the illusion of more HP, but put the car on a dyno and the RWHP should be less or at the very best the same with a stall.

ls1650, you will lose some HP, but it is well worth the trade off.

ls1650

hey thanks guys, this really help a lot.

mrr23

iTrader: (3)

here you go. my 00 formula stock vs yank py3400e converter unlocked 3.23 gears.

2nd gear stock was 10 mph (700 rpm)start. yank was 15 mph (1000 rpm) start due to blowing the tires off.


same but in 3rd gear

jimmyblue

iTrader: (11)

You gain power by being in a better place (RPM). You
lose power by any degradation in efficiency vs the old
converter. Converters vary pretty widely in efficiency
delivered, both peak and the profile of it. Yank's better
converters exceed stock efficiency even while running
higher stall speeds. But I've seen dyno curves from some
converters, that deliver pretty poor efficiency below peak.
You really want to know more than most vendors will tell
or guarantee. I wish more of them would publish dyno data
like Yank's.

The Pro Torque guys are pretty much old-school as near
as I can tell, I hit them up a couple years back just 'cause
they were a local operation but they weren't even doing
lockup converters then. So I wouldn't consider them to be
a good example, and you (MattZ28) might want to try
another converter with more development behind it. The
loss in trap suggests a poor efficiency, or at least a stall
mismatched to your powerband (if your HP is fading before
peak efficiency comes on, net loss perhaps).

MattZ28

iTrader: (4)

Thanks for the advice. I'm doing heads/cam soon, and if I can't cut 1.6s on motor, I'm going to get a Vigilante...

MNR-0

212-220 cam only here. My Fuddle 3000 rockets my Monaro (GTO) to 1.65 60' and 11.9@114 back to back runs.

Drew778

iTrader: (2)

What gears do you have?

Maybe your running to tall a tire, might want to try the 275/50/15's next time?