I know, I know just another Duramax swapped nova

[bmc1025]

How can I add some power and make the 4l80 live

My experience with the 4L80 is trying to make it live in abused plow/dump trucks. I'm not afraid to dive into these transmissions by any means, but like everyone has suggested talk to JoshH. He has more experience making them last behind the Duramax, while going fast, than anyone most likely.

Your setup should have a 4L85E.

 

[3_8scbug]

Can someone tag him. I ran the vin at GM because there was some questions about which engine and they said it is a 80

 

[3_8scbug]

Got the engine out today.

On an unrelated note. I found a bit of oil in the intercooler. Should I be concerned about it

 

[bmc1025]

Can someone tag him. I ran the vin at GM because there was some questions about which engine and they said it is a 80

The 4L85E is practically the same as a 4L80E.

 

[malibu795]

The 4L85E is practically the same as a 4L80E.

85 have uploaded shafts and planetaries and clutch pistons

 

[3_8scbug]

What kind of power can I put through the stock trans in a 3800lb vehicle

 

[malibu795]

If you keep traction as a weak link..
400hp will easily smoke the tires. 3.08 gears 26" tall tires and 4l85's .75 od put you about 2100 rpm at 70mph which is about factory setup with 5sp trucks and stock tires

Definitely at minimum make sure you have a 34 element sprag and shift kit. I smoked one with less power.

Swap TC to a ~1800-2000 advertised stall/coupling with billet TC postion minimum..
Suncoast gorend and DPC make billet single/triple disc TC

 

[3_8scbug]

Rolling it will blow the tires off or standing still

 

[malibu795]

Both 400hp is about 800 tq you will smoke any street tire under 315 easy

 

[3_8scbug]

Awesome. I really want to put a twin screw supercharger on it later. People say it can't be done and that makes me was to do it more

 

[malibu795]

Its been done guy in Australia did it about 8 years ago sounded awesome

Needed custom drive pulley for the crank due limit rpms
This truck

 

[malibu795]

http://www.dieselplace.com/forum/3-...s-upgrades/215438-supercharged-duramaxes.html

http://www.dieselplace.com/forum/3-...s-upgrades/215438-supercharged-duramaxes.html

 

[SmokeShow]

Banks has done the twin screw too. And wasnt the Empire diesel supercharged duramax a twin screw forcefed by twins?

 

[3_8scbug]

Great so it can be done. One thing about this car is, it is a family car. So I don't want huge numbers. Want decent torque, fun to drive, and super reliable. I want something that isn't seen everywhere. An LS swap would have been a lot easier but where is the extra wow factor of the guy down the street can buy the same motor mount kit you did and bolt together one. If they make a kit it's too common for me. That's just my opinion. Also who doesn't love the look of a blower on an old car.

 

[malibu795]

Stock fuel/air will give you 500 hp and alot if reliability

 

[3_8scbug]

I cant find any figures other than cfm calculations, I know it takes "x" cfm to make "x amount of hp". a stock lb7 turbo needs around 27 psi to move 750 cfm where a twin screw charger would only need around 11psi to move the same amount of air. lets put it like this, if you are making 500hp at 35 psi on a stock charger. you upgrade to a larger turbo, you can make the same power with less boost. If you open up your heads with a better flowing intake, heads, and a higher lift cam it would take less psi to get to the same hp number. plus with the twin screw who wouldn't love to see 3 psi at idle. and more torque under 1500 rpm than a big block gas motor produces total. and like I said I love the look of a blower on an old car.

 

[bmc1025]

Making all your power down low is asking for trouble with these motors. It gets really expensive really fast. 500hp is as easy as a lift pump and a tune if the rest of the fuel system is in good shape. If you want a reliable daily driver I would stay stock with a 500hp tune. With that light of car and the tourqe that is on tap it will feel like a rocket.

 

[malibu795]

All stock turbo dmaxs will do 500-550 hp at the tires. Which iirc is ~50lbmin of air flow
Boost is restriction not power

 

[3_8scbug]

yes I agree it would feel like a rocket, im still feeling out what kind of numbers I want and when I want to bring the torque in. as far as power I was thinking 425hp at the wheels from a blower. will be very usable and fun. not searching for huge dyno numbers means I wont need to turn the blower high enough to worry about too much heat. ive got something I will be trying out as far as heat exchange intercooling that will be an immense help.

 

[3_8scbug]

All stock turbo dmaxs will do 500-550 hp at the tires. Which iirc is ~50lbmin of air flow
Boost is restriction not power

finally someone that understands