4L80E parasitic loss over 4L60E, high RPM issues?? - LS1TECH - Camaro and Firebird Forum Discussion



Automatic Transmission 4L60E | 4L80E | TH350 | TH400 | TH2004R | Powerglide | Converters | Shift Kits
Sponsored by:
Sponsored by:

4L80E parasitic loss over 4L60E, high RPM issues??

Reply
 
Thread Tools Search this Thread
Old 06-27-2005, 10:21 AM   #1
TECH Addict
Thread Starter
iTrader: (9)
 
FastKat's Avatar
 
Join Date: May 2005
Location: Washington, D.C. and Pittsburgh, PA
Posts: 2,353
Default 4L80E parasitic loss over 4L60E, high RPM issues??

What is the parasitic loss on a 4L80E compared to a built 4L60E? I know the 80 is much heavier duty and probably leeches more power from the engine... any ideas or personal experience??

Also, anyone had problems reving the 4L80E up to 6000-6500RPM's? I know it's a truck transmission.

I have a 2003 6.0L w/4L80E trans out of a 2003 2500 cargo van that I am putting in a 1985 Jaguar XJ6. The total vehicle weight will be between 3800lbs and 4000lbs. Also using a turbo setup, so torque is going to be abundant... looking for around 625hp and 550ft/lb of torque at the rear wheels... don't know if a 4L60E can reliably hold that down.
FastKat is offline   Reply With Quote
Old 06-27-2005, 10:31 AM   #2
TECH Regular
 
Join Date: Feb 2004
Posts: 422
Default 6,000

Quote:
Originally Posted by FastKat
What is the parasitic loss on a 4L80E compared to a built 4L60E? I know the 80 is much heavier duty and probably leeches more power from the engine... any ideas or personal experience??

Also, anyone had problems reving the 4L80E up to 6000-6500RPM's? I know it's a truck transmission.

I have a 2003 6.0L w/4L80E trans out of a 2003 2500 cargo van that I am putting in a 1985 Jaguar XJ6. The total vehicle weight will be between 3800lbs and 4000lbs. Also using a turbo setup, so torque is going to be abundant... looking for around 625hp and 550ft/lb of torque at the rear wheels... don't know if a 4L60E can reliably hold that down.
remember a 4L80 overdrives the whole trans in 4th gear and it is heavy. a real plus is that is very strong, you can't say that about 4L60 good luck
john kilgore is offline   Reply With Quote
Old 06-27-2005, 10:56 AM   #3
TECH Addict
Thread Starter
iTrader: (9)
 
FastKat's Avatar
 
Join Date: May 2005
Location: Washington, D.C. and Pittsburgh, PA
Posts: 2,353
Default

So you're saying it's safe up to 6,000 RPM's? Can you push it higher or what's the deal?

How an automatic transmission works is one thing I am not familiar with... but I guess what you're saying suggests you experience more drag and parasitic loss in overdrive than a 4L60E?

Quote:
Originally Posted by john kilgore
remember a 4L80 overdrives the whole trans in 4th gear and it is heavy. a real plus is that is very strong, you can't say that about 4L60 good luck
FastKat is offline   Reply With Quote
Old 06-27-2005, 11:24 PM   #4
On The Tree
iTrader: (3)
 
Join Date: Jun 2003
Posts: 120
Default

My car *only* made 575ft-lbs last season, and i had no trouble running my 4l80 to 6800

I think you will be fine with the 80 on your set up
Dutch SS is offline   Reply With Quote
Old 06-28-2005, 12:50 AM   #5
TECH Fanatic
iTrader: (1)
 
James B.'s Avatar
 
Join Date: Mar 2003
Location: 33.91 -117.48
Posts: 1,853
Default

All drums, carriers, housings, and other rotating parts of the 80 are all steel. If you want to take it to higher RPM apply the same logic as doing so with a TH400. If it frags it can kill you, so put a shield around it.

I've seen several people take them past 6500. Mine sees only light duty at only 5500RPM max, so I can't really speak from first-hand experience.
James B. is offline   Reply With Quote
Old 06-29-2005, 08:35 AM   #6
TECH Resident
 
Join Date: Dec 2004
Location: Baltimore, MD.
Posts: 841
Default

Quote:
Originally Posted by James B.
If it frags it can kill you, so put a shield around it.
I think thats good advice for any transmission that you push hard with big power, regardless of what the internals are made of.

'Dreamin'
'JustDreamin' is offline   Reply With Quote
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
4l80e shifter G-body swap ostrich Conversions & Hybrids 4 01-09-2017 06:28 PM
2003 express van pcm 6.0 4l80e rpm-inc Parts Classifieds 4 05-04-2016 07:50 PM
4l80e 2005 help fire5.7bird95 Automatic Transmission 0 02-26-2016 10:17 AM
2003 Trailblazer 4L60E ? Spellbound Automatic Transmission 13 02-12-2016 09:49 AM
Mamo 220 Build Complete. Whisper Generation III Internal Engine 15 12-09-2015 06:09 PM


Tags
4l60, 4l60e, 4l80, 4l80e, automatic, built, drag, gearing, hp, loss, losses, losshorse, parasitic, power, rpm, transmission, wheels

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -5. The time now is 09:31 AM.


 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: