Waiting on converter...

driller

El Presidente
Staff member
I was supposed to pick up the '93 from the shop Saturday where it has been undergoing a torque converter transplant. I am getting the stock converter replaced with a 3500 rpm stall speed PI Stallion Triple Disc Lockup torque converter.

The shop has had it all week, didn't start on it until Friday(supposedly) and couldn't get it finished Saturday(1/2 day). Turns out it won't be ready 'til Monday. :( Now, my schedule won't allow me to pick it up until Tuesday evening or later in the week. :( :(

I miss my car. ;(

So, I've been bench racing! }(

I've done a lot of reading and have compiled the following quotes establishing the drop in ETs with a high stall converter...

Your 0-60 and 1/4 mile performance times can be reduced by as much as 2 to 3 tenths!

Dropped two tenths with a TC...

We installed a Precision Industries converter that stalled to 3200 rpm and the results were encouraging. With no other changes, the car picked up almost a full 3 tenths...

In conclusion, the net yields include a 60-foot improvement of 0.34 and a quarter-mile betterment of 0.225 seconds.

...converter easily is worth 3 tenths of a second

The car picked up about 4 tenths.

...will drop 1/4 mile times at least 5 tenths of a second!

I have seen as much as 5 tenths of a second improvement in 60 foot times just by going from a factory torque converter to the Precision Industries torque converter.

His trap speed of 116 marked a 4-mph improvement over the stock converter, and the car picked up almost six tenths, as well.

The standard performance gain reported is 2 tenths on 60 foot times and up to 3/4 of a second on overall elapsed times in the 1/4 mile. The torque multiplication on the 9.5-inch series is 2.53 to 1 compared to stock at 1.93 to 1. The torque multiplication of the converter will deliver an increase of up to 50 horsepower to the rear wheels.


So now the ultimate question... where will my(eventual) review fit in the above range of 2 tenths to 3/4 of a second? ::roll::
 
RE: Waiting on converter...

Let us know how it went and how that baby goes now !

I believe my TC is beginning to shutter, atleast that's what I'm making myself believe. When I'm at idle speed cruisin', at times the car begins to shutter/choke up a bit. My understanding is that it might be the tc, although I may be wrong. I'm just finding an excuse to replace the old tc with a new 3000 - 3200 high stall.

So, If I may ask a question, not to ruin your post tho. What would be the best high stall torque converter for a daily driven Mark VIII, also driven during the winter as of now.

Jon Ike
95 MKVIII[font color="#CC0000"]
MIDWEST CHAPTER [/font]
 
RE: Waiting on converter...

[div class="dcquote"][strong]Quote[/strong]
What would be the best high stall torque converter for a daily driven Mark VIII, also driven during the winter as of now.[/div]

I'll let everyone know my thoughts when I get the car back and get some street driving done and of course track times. But I will say the manufacturers I contacted recommended stall speeds from a low of 2800 to a high of 3200 to maintain 100% street manners. After talking to many end users, I believe they estimate conservatively for the daily driver crowd.
 
RE: Waiting on converter...

Your mph will be up a smidge, but if you get traction and off of the line every .1 you lower your short time you will get .2 lower ET.

That 3500 stall should lower your short time .15-.2 lower. I would expect on average your ET's to be .3 lower. You will have a 13 second car now.
 
RE: Waiting on converter...

Niice...i hope that all the bench racing quotes above are some what true. Then i will definately be in the high 8's. Thanks for the hope. haha bench racing is all i got over here, so I'm watching all you guys and your cars. Well that is if Dennis (the hurricane) didnt get to my car first. hehe I wont know anything till i get home in another 2 and a half months. :eek:

1995 DK BLUE Lincoln Mark VIII
1998 DK BLUE Chevrolet 1500 P/U
2004 BLACK HONDA CBR 600RR
 
RE: Waiting on converter...

[div class="dcquote"][strong]Quote[/strong]
I believe my TC is beginning to shutter, atleast that's what I'm making myself believe. When I'm at idle speed cruisin', at times the car begins to shutter/choke up a bit. My understanding is that it might be the tc, although I may be wrong.[/div]

Just a little advise, when you are feeling the "shutter/choke" slightly press the brake pedal with your left foot and see if it stops, if it does than your t/c was just in "lock-up" at a very low speed. I have the same problem with my stock t/c, it feels like its surging and has a loss of power unless I make it kick down, I've heard this is normal and also that it is amplified a bit with a stall converter. Don't sweat it dude!
 
RE: Waiting on converter...

[div class="dcquote"][strong]Quote[/strong]
[div class="dcquote"][strong]Quote[/strong]I believe my TC is beginning to shutter, atleast that's what I'm making myself believe. When I'm at idle speed cruisin', at times the car begins to shutter/choke up a bit. My understanding is that it might be the tc, although I may be wrong.[/div]Just a little advise, when you are feeling the "shutter/choke" slightly press the brake pedal with your left foot and see if it stops, if it does than your t/c was just in "lock-up" at a very low speed. I have the same problem with my stock t/c, it feels like its surging and has a loss of power unless I make it kick down, I've heard this is normal and also that it is amplified a bit with a stall converter. Don't sweat it dude!
[/div]
I've been feeling the same thing. Cruising to work around 40-42 mph, if I hit the gas a little it sometimes stumbles before it jumps into gear. I'm not sure if that is what you are talking about. When I jump on it it goes through all the gears just fine, shifts nice. Could it be time for new plugs as well? Maybe its the engine and not the tranny? Almost 73,000 on her.::roll::
 
RE: Waiting on converter...

[div class="dcquote"][strong]Quote[/strong]
I've been feeling the same thing. Cruising to work around 40-42 mph, if I hit the gas a little it sometimes stumbles before it jumps into gear. I'm not sure if that is what you are talking about. When I jump on it it goes through all the gears just fine, shifts nice. Could it be time for new plugs as well? Maybe its the engine and not the tranny? Almost 73,000 on her.::roll::
[/div]

Stock, that'd be in the low rpm band, in OD with the TC locked. Now you're asking it to move along a bit. It tries, but being low on the torque curve, it has to unlock the TC and perhaps shift out of OD and then it's expecting more fuel but you're just feathering it. Hence the stumble. I think it's the same, just mine is amplified with the 4.10s and stall converter. That and it would lock, lose torque, unlock, gain torque, back and forth.

Try just cruising like before, but if it starts acting up, just touch the brake with your left foot just enough to make the brake lights come on without changing the throttle. You should see/feel the rpms increase slightly and the car should then be more responsive. If that's the ticket, you may want to consider a chip or tune. Or, do as I used too and switch off OD when needing to keep the car more in the power band and out of that indecisive stumbling mode.
 
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