4l60e/4l65e/4l80e differences

[californiacuda]

Could you list weights of 4l60 and 4l80 with converter, I have a Twist Machine paddle shifter in my cuda with a 4l80e and it is very, very cool. Keep hands on wheel quick shifts, good control. Is there something I can do to the transmission (I'm not sure how to explain this) when down shifting to not be freewheeling. When I downshift, its not like a stick where the engine and transmission slow the car down?

[camcojb]

Originally Posted by californiacuda

Could you list weights of 4l60 and 4l80 with converter, I have a Twist Machine paddle shifter in my cuda with a 4l80e and it is very, very cool. Keep hands on wheel quick shifts, good control. Is there something I can do to the transmission (I'm not sure how to explain this) when down shifting to not be freewheeling. When I downshift, its not like a stick where the engine and transmission slow the car down?

Steve at Twist Machine can hook you up with a shop that can make your trans do what you're asking. It is not a software or tuning deal, there are mods to the trans required.

Cool thing is it would be an awesome way to go on the road course, but it is not a real cheap mod.

Jody

[Steve Chryssos]

Originally Posted by camcojb

Steve at Twist Machine can hook you up with a shop that can make your trans do what you're asking. It is not a software or tuning deal, there are mods to the trans required.

Cool thing is it would be an awesome way to go on the road course, but it is not a real cheap mod.

Jody

I don't think the valve body mod is terribly expensive. The bigger question is whether or not it can be done to 4L80E's or just 60's

[Steve Chryssos]

As for the weight issue, there ae a couple of good threads on SyTy.net--a site where all wheel drive turbo maniacs tend to drive over their transmissions. The difference wbetween the smaller transmissions and the 4L80E s like 70 lbs. And that 70lbs is located at the very bottom center of the car, so weight should not be a consideration

Here's one thread. There is another with a photo comparison that I can't locate right now. I'll keep looking.

http://www.syty.net/forums/showthrea...8&page=1&pp=15

[camcojb]

Originally Posted by streetfytr68

I don't think the valve body mod is terribly expensive. The bigger question is whether or not it can be done to 4L80E's or just 60's

I thought it was more than a simple valve body swap. You threw some numbers at me before for one, and it was not what I'd call a cheap mod. I wanted to do it to a 4L80E so maybe we didn't communicate well!

[Steve Chryssos]

Originally Posted by camcojb

I thought it was more than a simple valve body swap. You threw some numbers at me before for one, and it was not what I'd call a cheap mod. I wanted to do it to a 4L80E so maybe we didn't communicate well!

That's how it goes on the cutting edge I have a big pow wow with Mark Bowler tonight. I will confirm.

[californiacuda]

Steve, Twist Machine,

Thank you so much for your detailed and educated response. I'm building a Keith Black 572, aluminum block, twin plug, twin turbo engine with hp in the 1500+ range. Maybe I can give you a call and pick your large brain for some ideas on how to control it. Thanks.

[Steve Chryssos]

Dude! 1500HP is a lot of beans! Call or email. I have everything you need.
/S

[Steve Chryssos]

Cuda,
Awesome! I think you were one of our first customers a few years back. Thank you so much for having faith in our idea. There are a couple of things you can do regarding engine braking and more products in the works.
In the Present:
1) Drop your floor shifter down into 3rd gear to take advantage of the overrun clutches.
2) You can also try a little more rear brake bias in lieu of engine braking. That's what I do.
3) Install a tighter converter. I have found that pro-touring cars prefer 500rpm to 1000rpm less stall speed than the typical street/strip recommendation. If the engine seems like it's dropping to an idle when you lift off the throttle at low speeds, your converter is too loose.

The near future:
1) Bowler has been performing reliability tests on modified valve bodies for 4L60E transmissions to enhance engine braking. You can here it in action here Not sure if they will sell similar modified valve bodies for 80's.
2) Our 2007 SEMA car, being built by Jason Huber at G-Force Design will have what we call a "6/8 Manumatic" It consists of the following:
-4L80E
-Gear Vendors Gear Splitter
-Bowler Electronics
-Twist Paddle Shifter.
This is the ultimate setup. You are most of the way there so you should strongly consider this option. The Bowler Electronics allow you to perform both gear changes and gear splits from our paddle shifter. Put the floor shifter in 3rd gear and you get a six speed with engine braking. Put the floor shifter in overdrive and you get an eight speed with no engine braking for highway use.
3) The 6/8 Manumatic is pricey, so we're working with Pro-Torque to develop small diameter (light weight), high efficiency, multi-disc lock up converters for pro-touring cars. 4L80E converters will have increased lock up clutch surface area such that you can program your computer to stay locked up in more circumstances than just low load highway cruising. When I show you a picture of the converter internals, you will think that you're looking at a manual's clutch. No accident there.
We'll be testing a 9.5" multi disc converter with 2400 rpm stall speed in the coming months. Just like a manual. a locked up converter provides direct drive. When you lift, you will have engine braking. The computer will unlock the converter based on wheel speed. That's the plan. Price for the custom matched, custom built 4L80E converter will be $995.