how important is the converter in TH400's/4L80E's
07-06-2005, 03:44 PM
#1
how important is the converter in TH400's/4L80E's I guess this question stands for TH400's and 4L80E's alike, as the 80E is pretty much a 400 w/overdrive...
I know on the 4L80E's come with a heavier duty torque converter than the 4L60E's, so is a new higher-stall converter absolutely necessary in a high output (say a 650hp turbo) application? What happens if you leave a stock converter in? does it slip or what?
I know on the 4L80E's come with a heavier duty torque converter than the 4L60E's, so is a new higher-stall converter absolutely necessary in a high output (say a 650hp turbo) application? What happens if you leave a stock converter in? does it slip or what?
07-07-2005, 11:59 AM
#2
Anybody??
Originally Posted by FastKat
I guess this question stands for TH400's and 4L80E's alike, as the 80E is pretty much a 400 w/overdrive...
I know on the 4L80E's come with a heavier duty torque converter than the 4L60E's, so is a new higher-stall converter absolutely necessary in a high output (say a 650hp turbo) application? What happens if you leave a stock converter in? does it slip or what?
I know on the 4L80E's come with a heavier duty torque converter than the 4L60E's, so is a new higher-stall converter absolutely necessary in a high output (say a 650hp turbo) application? What happens if you leave a stock converter in? does it slip or what?
07-07-2005, 12:21 PM
#3
11 Second Club
Join Date: Nov 2001
Location: NE PA
Posts: 1,320
Likes: 0
Received 0 Likes
on
0 Posts
How much hp a tranny can handle has absolutely nothing to do with and has no effect on the function of the torque converter. If you leave the stock converter in, it will just do it's thing and be a stock converter.
If you want the characteristics and benefits of a high-stall converter, you'll have to buy one.
If you want the characteristics and benefits of a high-stall converter, you'll have to buy one.
07-07-2005, 01:43 PM
#4
I know this is bad... All I know about torque converters is how they work.... I don't know ANYTHING about stall convertes or the benefits of higher stalls, etc. Seems to me like you'd want a low stall speed unless you weren't building torque until higher RPM's... seems like a lower stall speed would be more efficient?
Originally Posted by XTrooper
How much hp a tranny can handle has absolutely nothing to do with and has no effect on the function of the torque converter. If you leave the stock converter in, it will just do it's thing and be a stock converter.
If you want the characteristics and benefits of a high-stall converter, you'll have to buy one.
If you want the characteristics and benefits of a high-stall converter, you'll have to buy one.
07-07-2005, 02:52 PM
#5
a properly matched and built tq convertor is MORE important than the engine. in a turbo application it INCREDIBLY important. you are gonna spend the money but it will make or break the combination. keep researching or you will end up buying a boat anchor.
07-07-2005, 06:29 PM
#6
I would never run a stock 4L80E converter. They weigh a ton. Most stall very low.
The main concern you have is cam vs converter, if you run a moderate cam a stock 4L80E converter will make the engine want to stall at idle in gear.
This doesn't seem to be as bad for th400's. In fact I'd say there is a big difference between the two.
The main concern you have is cam vs converter, if you run a moderate cam a stock 4L80E converter will make the engine want to stall at idle in gear.
This doesn't seem to be as bad for th400's. In fact I'd say there is a big difference between the two.
07-07-2005, 09:16 PM
#7
WOW that must have a really low stall speed. I didn't realize they were that important... I guess the whole point of a higher stall is to let the engine get into the higher RPM band before the drivetrain is engauged... I think the converter is going to be one of the last things I get for my car.
Originally Posted by jxaxsxoxn
I would never run a stock 4L80E converter. They weigh a ton. Most stall very low.
The main concern you have is cam vs converter, if you run a moderate cam a stock 4L80E converter will make the engine want to stall at idle in gear.
This doesn't seem to be as bad for th400's. In fact I'd say there is a big difference between the two.
The main concern you have is cam vs converter, if you run a moderate cam a stock 4L80E converter will make the engine want to stall at idle in gear.
This doesn't seem to be as bad for th400's. In fact I'd say there is a big difference between the two.
Trending Topics
07-08-2005, 10:06 AM
#9
12 Second Club
iTrader: (3)
Join Date: Jun 2004
Location: Fountain Inn, SC
Posts: 291
Likes: 0
Received 0 Likes
on
0 Posts
If you wanted to get the most out of the car you need to match the stall to wear your going to be building your boost say 10psi@4000 rpm's I would go with a 4000 stall so you dont have any turbolag.. if you keep the stock converter your going to have alot of lag
07-08-2005, 10:39 AM
#10
Well first I want to focus on getting the engine running properly, and do the tuning. After I know exactly how the engine is going to run, i'll be able to select the approprite converter. It will also be nice to see how well it will hook up, as I am limited to 9.5" wheels and tires on the rear.
Originally Posted by XTrooper
Huh?! 
07-09-2005, 03:37 PM
#11
11 Second Club
Join Date: Nov 2001
Location: NE PA
Posts: 1,320
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by FastKat
Well first I want to focus on getting the engine running properly, and do the tuning. After I know exactly how the engine is going to run, i'll be able to select the approprite converter. It will also be nice to see how well it will hook up, as I am limited to 9.5" wheels and tires on the rear.
07-09-2005, 05:33 PM
#13
I know a dude with a stock stall behind an old 350 SBC with big solid cam etc.
Idles at 1500rpm right around stall speed, when you put it in gear you need to feet on the brake pedal to stop it moving.
As soon as you pop it into gear it chirps the tyres as its ready to move, not safe and looks stupid. Also just wheel spins when you take off.
Just order a converter to suit your engine once its been dynoed.
Idles at 1500rpm right around stall speed, when you put it in gear you need to feet on the brake pedal to stop it moving.
As soon as you pop it into gear it chirps the tyres as its ready to move, not safe and looks stupid. Also just wheel spins when you take off.
Just order a converter to suit your engine once its been dynoed.
