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Old 10-31-2018, 10:48 PM   #46
DblTrbl
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Quote:
Originally Posted by Maniacmechanic1 View Post
Some Hi Boost 40-50 psi Imports I set at .035.
I'm not building an engine for that kind of boost. Let's stick with the program.
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Old 10-31-2018, 10:50 PM   #47
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Quote:
Originally Posted by DblTrbl View Post
I'm not building an engine for that kind of boost. Let's stick with the program.
Block and heads are not machined O-Ring Grooved.
Never happen on High Boost.
Also need special Head Studs....super expensive.
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Old 10-31-2018, 11:00 PM   #48
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modified a welding clamp help manage the final drive assembly

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Old 10-31-2018, 11:11 PM   #49
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After searching through a number of boards, I found that there was a ton of information about modifying these transmissions. I found that some guys who are in the business, provide some info, but most of the time they are vague, incomplete or meant to scare people into not working the the trans themselves. Then there were a few guys who were knowledgeable and straightforward that gave what I felt was clear guidance, ideas and photos. Based on exhaustive search through their posts, I'm doing the following mods to get my trans to handle about 1000hp.

The two most important mods appear to be to dual feed the direct clutch and the Large Ratio Boost valve sonnax 4L80E-LB1. Dual feed provides more fluid to clamp the clutches used for 3rd gear. The large ratio boost valve provides higher maximum line pressure to clamp the clutches and bands tighter while still maintaining a reasonably low line pressure when cruising.

In addition, I'm doing these:
Actuator Feed Limit repair kit transgo 48-ACT-TL
Line to Lube Pressure Regulator Valve Sonnax 34200-14K
Torlon Check Balls (you need 8) sonnax 10000-08
No Walk Case Busing sonnax 34006-SP
replace rear case bushing with torrington bearing.
More clutches in the direct drum.
increasing the size of the feed holes for 1st, 2nd and 3rd.
remove and block the 3rd gear accumulator.
drill larger pump seal drain hole.
of course I'm replacing any worn bushings, seals and gaskets.
300M input Shaft.
Billet forward clutch hub.
I'm sure i'm forgetting some stuff.



I'm not going the transgo HD2 route for now.


I am not a 4L80E expert. If anyone is a 4l80E expert, I look forward to hearing your on topic remarks.
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Old 10-31-2018, 11:15 PM   #50
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Transmissions are the best jigsaw puzzle ever.
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Old 10-31-2018, 11:26 PM   #51
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Roll Bar

For mid 10s, a 5 or 6 point roll bar will do. Because I'm doing lots of fab work, and want to keep the ability to raise and lower the body, I don't want to weld the bars to the frame. Instead I'm bolting the bars to the frame. I added additional plates, with nuts welded to reinforce the frame and provide bolt-in location. The bars have an equivalent plate welded to them so it's plate to plate bolt in.




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Old 10-31-2018, 11:32 PM   #52
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I bought a mild steel cage for the C3, but I wanted to get a better fit, so I rebent some of the tubes to get the cage to contour into the back of the car and tighter up against the roof and walls. Keep in mind, this car will also be a cruiser, so I want the cage as out of the way as possible.






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Old 10-31-2018, 11:43 PM   #53
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Ok, here's where the "digital" starts to kick in.


Next I went a little overboard. Had a layoff from work, so I had some time and designed and built a 4l80E transmission controller.



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Old 11-01-2018, 04:55 AM   #54
Maniacmechanic1
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Quote:
Originally Posted by DblTrbl View Post
After searching through a number of boards, I found that there was a ton of information about modifying these transmissions. I found that some guys who are in the business, provide some info, but most of the time they are vague, incomplete or meant to scare people into not working the the trans themselves. Then there were a few guys who were knowledgeable and straightforward that gave what I felt was clear guidance, ideas and photos. Based on exhaustive search through their posts, I'm doing the following mods to get my trans to handle about 1000hp.

The two most important mods appear to be to dual feed the direct clutch and the Large Ratio Boost valve sonnax 4L80E-LB1. Dual feed provides more fluid to clamp the clutches used for 3rd gear. The large ratio boost valve provides higher maximum line pressure to clamp the clutches and bands tighter while still maintaining a reasonably low line pressure when cruising.

In addition, I'm doing these:
Actuator Feed Limit repair kit transgo 48-ACT-TL
Line to Lube Pressure Regulator Valve Sonnax 34200-14K
Torlon Check Balls (you need 8) sonnax 10000-08
No Walk Case Busing sonnax 34006-SP
replace rear case bushing with torrington bearing.
More clutches in the direct drum.
increasing the size of the feed holes for 1st, 2nd and 3rd.
remove and block the 3rd gear accumulator.
drill larger pump seal drain hole.
of course I'm replacing any worn bushings, seals and gaskets.
300M input Shaft.
Billet forward clutch hub.
I'm sure i'm forgetting some stuff.



I'm not going the transgo HD2 route for now.


I am not a 4L80E expert. If anyone is a 4l80E expert, I look forward to hearing your on topic remarks.



That would Be Me again .
I know more about them than anyone here.


Its A Turbo 400 trans with An Overdrive unit.


Only 2 Transmissions Exist that you can use at 1000 HP Stock or Near Stock.
The Mighty Turbo 400 Hydromatic.
The C7 Corvette 8L80E based off the original Turbo 400.


Your Right.
Not a single person online gives out all secrets online building engines, transmissions & rear differentials.
If You Do You put yourself out of business right then & there.

Last edited by Maniacmechanic1; 11-01-2018 at 05:44 AM.
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Old 11-01-2018, 05:27 AM   #55
Maniacmechanic1
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Quote:
Originally Posted by DblTrbl View Post
After searching through a number of boards, I found that there was a ton of information about modifying these transmissions. I found that some guys who are in the business, provide some info, but most of the time they are vague, incomplete or meant to scare people into not working the the trans themselves. Then there were a few guys who were knowledgeable and straightforward that gave what I felt was clear guidance, ideas and photos. Based on exhaustive search through their posts, I'm doing the following mods to get my trans to handle about 1000hp.

The two most important mods appear to be to dual feed the direct clutch and the Large Ratio Boost valve sonnax 4L80E-LB1. Dual feed provides more fluid to clamp the clutches used for 3rd gear. The large ratio boost valve provides higher maximum line pressure to clamp the clutches and bands tighter while still maintaining a reasonably low line pressure when cruising.

In addition, I'm doing these:
Actuator Feed Limit repair kit transgo 48-ACT-TL
Line to Lube Pressure Regulator Valve Sonnax 34200-14K
Torlon Check Balls (you need 8) sonnax 10000-08
No Walk Case Busing sonnax 34006-SP
replace rear case bushing with torrington bearing.
More clutches in the direct drum.
increasing the size of the feed holes for 1st, 2nd and 3rd.
remove and block the 3rd gear accumulator.
drill larger pump seal drain hole.
of course I'm replacing any worn bushings, seals and gaskets.
300M input Shaft.
Billet forward clutch hub.
I'm sure i'm forgetting some stuff.



I'm not going the transgo HD2 route for now.


I am not a 4L80E expert. If anyone is a 4l80E expert, I look forward to hearing your on topic remarks.

1st off the Torque Converter in a 4L80E is Real Heavy.
Weighs in close to 70 lbs.
Getting back to Rotating Mass.
Your going to need a High Dollar Triple Disc Lockup torque converter.
Expect to pay $2,000 + to start for it.


Be a smaller diameter & varies upon the ordered RPM stall or flash rpm rating.


A Pro Mod Smooth Sprag is often used.


Aluminum Drums are usually used at 1000 HP.
They do not last long on the street.
The steels cut into the soft aluminum.
Hard Anoidized helps but still the steels cut through it.
Titanium Drums are the real solution from COAN Racing.


The Overdrive unit is the weak spot also in a 4L80E.
Does not like having Huge HP through it at WOT.


Need full manual control of the transmission for sure at 1000 HP if your really going to drag race it.


That negates the entire auto shift of a 4L80E.


So in summary your better off with a Turbo 400 Trans.
Low Cost.
Torque converter selection is Excellent & Very affordable.
Drag strip its 1-2 & 2-3 shift done only.
Never use 4th gear overdrive going down the 1320.
If you do it slows you down 1-2 seconds.


Frictions.
Some Use Borg Warner Tans.
Some use Alto Red Eagle frictions & Kolene steels like I do.
Some use Borg Warner HEG Greens.
Some Use Raybestos Red or Blues.
All up for Debate.


Dextron 6 ATF is not wanted for Drag Racing.
The Friction modifiers inside give granny smooth shifts.
All looks good on paper till Raceday.
Stuff is just too slick.
frictions & bands slip because of it from huge torque & Hp put into.


I use Castrol GTX Dex/Merc in my own.
Like It.
Most use Hytran Tractor Hydraulic Fluid for Big power.
Others use Jet Engine Turbine Oil or special Air compressor oil.


Hytran Hyd. Fluid safest to use & no issues as a substitute for regular store bought ATF.


The Guys doing recipe builds never race.
Just happy to have you come back with your failed Auto trans.


Jakes Transbrake D1 & D3 gives full manual control to a 4L80E. Also Auto shift.
Expensive.

Again a Turbo 400 a better value for what your doing.


For $7500 put into a 4L80E a Turbo 400 does better at $2K built yourself.
No Overdrive. Let the engine sing RPM.
Not Pro Tour action.
Its Full Street Race & Drag race.




The Turbo 400 also has or had Asbestos lined Reveres Band .
Best ever made.
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Old 11-01-2018, 05:30 AM   #56
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The way to make your 4L80E last as is configuration is to cut back Hp Goals.
780-800 Hp Flywheel.
Subtract 150 Hp ( High side of Hp loss) on chassis dyno.


Limit RPM to 6700.
6400 RPM better.
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Old 11-01-2018, 05:35 AM   #57
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Guys have advised rebuilding the 4L80E Planets.
They were truck transmissions original & ran many for 300,000 to 500,000 miles.
If the planets spin smooth likely OK but never can tell unless the staked pins are ground off & pressed out.
New Parts installed.
Pins TIG Welded in place.


Turbo 400 has same planet gearsets.
or 4L80E used the Turbo 400 parts Bin.


Back in the day Dextron 1 or it was just called Dextron was Made from Whale Sperm Oil.
Most Autos lived for 200,000 miles back then no filter or fluid change ever done.
You tear down an original Turbo 400 that is 50 years old from Muscle car era & most of the time Its Brand New Inside Yet.
Zero Wear anyplace.
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Old 11-01-2018, 06:33 AM   #58
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Back to your 4L80E again what You have.
Transgo is the most trusted name in Shift kits for the Little Guy.
Used by several Pro Builders also.
They just do not tell the truth.
Not the final answer for all.


Drilled hole sizes are kept secret by many.


Transgo claims their shift kit for a 4L80E makes it good for 1000 HP.
Its a Big Claim. They must have done it.
Left out all hard part details used in the video.
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Old 11-01-2018, 06:40 AM   #59
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Old 11-01-2018, 06:45 AM   #60
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