4L80E transgo HD2 vs HPTuners
10-25-2019, 08:17 PM
#1
4L80E transgo HD2 vs HPTuners
I'm looking at adding a turbo to my 2001 Chevy 1500HD and the common upgrade for the 4L80E transmission is to add an HD2 shift kit. Is there anything in the HD2 kit that I can't do tuning in HPTuners? The only thing I see is the pressure relief valve, which is weird in the HD2 kit and I was planning on using the Sonnax boost valve, which does the same thing, instead. Pressures and shift times are easy enough to change in HPTuners, so what am I missing? Since the rest of the drive train seems beefy, I would like to push between 500 to 600rwhp if possible.
Also, when should I be concerned about breaking the stock 2 piece steel driveshaft? Thanks.
Also, when should I be concerned about breaking the stock 2 piece steel driveshaft? Thanks.
10-25-2019, 10:15 PM
#2
If calibration in HP tuners is a claw hammer, think of an HD2 shift kit (or any other proper hydraulic modification) as a jackhammer. Changing settings in software can fine tune shifts, but only within the range of authority allowed by the calibrated hydraulics.
10-26-2019, 08:00 AM
#3
The HD2 makes physical modifications to the valve body that dual feeds the direct clutch.
This substantially increases holding power while in manual D3.
There is nothing you can do in HPT that will do the same thing.
The HD2 is actually a dirty way to dual feed the direct clutch. The right way is to pull the trans apart and remove the 2nd Oring out of the center support and plugging a hole.
https://www.performancetrucks.net/fo...l-feed-535430/
This substantially increases holding power while in manual D3.
There is nothing you can do in HPT that will do the same thing.
The HD2 is actually a dirty way to dual feed the direct clutch. The right way is to pull the trans apart and remove the 2nd Oring out of the center support and plugging a hole.
https://www.performancetrucks.net/fo...l-feed-535430/
10-28-2019, 09:23 AM
#4
TECH Apprentice
The HD2 makes physical modifications to the valve body that dual feeds the direct clutch. No it doesn't. It is just a different separator plate that dual feeds the directs. You could use the sep. plate on its own and dual feed the directs.
This substantially increases holding power while in manual D3. Not just in D3...anytime the direct clutches are engaged. aka 3rd gear and 4th gear regardless of shifter position.
There is nothing you can do in HPT that will do the same thing.
The HD2 is actually a dirty way to dual feed the direct clutch. The right way is to pull the trans apart and remove the 2nd Oring out of the center support and plugging a hole. Correct...you should also omit the center seal on the direct drum
https://www.performancetrucks.net/fo...l-feed-535430/
This substantially increases holding power while in manual D3. Not just in D3...anytime the direct clutches are engaged. aka 3rd gear and 4th gear regardless of shifter position.
There is nothing you can do in HPT that will do the same thing.
The HD2 is actually a dirty way to dual feed the direct clutch. The right way is to pull the trans apart and remove the 2nd Oring out of the center support and plugging a hole. Correct...you should also omit the center seal on the direct drum
https://www.performancetrucks.net/fo...l-feed-535430/
Essientially...the hd2 kit is junk. Sloppy mechanics wiki page has a writeup on the do's and don'ts of the HD2
If you're going to do anything...use the separator plate, and that's about it.
Use the sonnax boost valve and also their line to lube PR valve.
10-29-2019, 07:18 PM
#6
Made some notes to help explain this better.
Essientially...the hd2 kit is junk. Sloppy mechanics wiki page has a writeup on the do's and don'ts of the HD2
If you're going to do anything...use the separator plate, and that's about it.
Use the sonnax boost valve and also their line to lube PR valve.
Essientially...the hd2 kit is junk. Sloppy mechanics wiki page has a writeup on the do's and don'ts of the HD2
If you're going to do anything...use the separator plate, and that's about it.
Use the sonnax boost valve and also their line to lube PR valve.
10-30-2019, 07:12 AM
#7
TECH Apprentice
Not for plates. You can tear the trans apart and do it the RIGHT way.
OR, superior brand shift kit uses some pipe type feed for dual feed...i personally hate it...but it is another option if you want it
OR, superior brand shift kit uses some pipe type feed for dual feed...i personally hate it...but it is another option if you want it
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11-04-2019, 07:49 AM
#9
TECH Apprentice
you know breaking the tires loose on a 1-2 shift hasn't been cool since 1981 right? It's not good for the trans, it's not good for anything really.
Removing torque management is pretty pointless but if you're having fun, who am I to judge.
Reffering to post#5...the hd2 doesn't do anything special do D3 vs D...the direct clutch will be dual fed any time it is engaged. plain and simple.
If you're going to tear the trans apart and replace the direct clutch springs...you'd be absolutely foolish to continue to use the HD2 kit. Because you could internally dual-feed the trans and be left with a much better way of doing things, for a LOT less money.
Removing torque management is pretty pointless but if you're having fun, who am I to judge.
Reffering to post#5...the hd2 doesn't do anything special do D3 vs D...the direct clutch will be dual fed any time it is engaged. plain and simple.
If you're going to tear the trans apart and replace the direct clutch springs...you'd be absolutely foolish to continue to use the HD2 kit. Because you could internally dual-feed the trans and be left with a much better way of doing things, for a LOT less money.
11-04-2019, 05:10 PM
#10
I had a car many years ago that barked every shift, that gets old fast and just bangs the crap out of the rest of the drivetrain. Sounds like I want to just use the HD2 plate ( to dual feed 3rd gear) and Sonnex boost valve to add a little pressure with releaf. Thanks.