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4L80E vs 6L80E

 
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Joined: 30 May 2002
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1979 Chevrolet Camaro

PostPosted: Thu Aug 19, 2010 2:57 pm    Post subject: 4L80E vs 6L80E Reply with quote

I've been looking to swap an LS motor into my 79 Z28. The car will be a driver but mainly used for drag racing. My original plan was to look for an LQ4 / 4L80E combo, however since the LY6/6L80E are now affordable I'm considering this as an option.

My main question is will the 6L80E fit the transmission tunnel? I don't mind a little hammer time on the trans tunnel but do not want to have to cut it out and fab up a new one to clear the transmission.

Is the 6L80E a big improvement over the 4L80E? For drag racing I'll have a minimum of another shift in the 1/4 mile and first gear is HUGE! With the 3.73's in the car now first becomes 15:1, Shocked.

Here are the gear ratios for the 6L80E:
1st - 4.027
2nd - 2.364
3rd - 1.532
4th - 1.152
5th - 0.852
6th - 0.667


Anybody know the weight difference?

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squeeezer
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1991 Chevrolet Camaro

PostPosted: Thu Aug 19, 2010 9:20 pm    Post subject: Reply with quote

i personally would go with the trans that has been around since the early 90's
because there are all upgrades through the years readily available
and 4l80,although parasitic is a proven trans
you can get manual valve bodies as well if you dont want a computer to decide for you
also im pretty damn sure it will take more abuse ....today ....in a couple years who knows

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squeeezer
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1991 Chevrolet Camaro

PostPosted: Thu Aug 19, 2010 9:21 pm    Post subject: Reply with quote

and we havent seen any here at the tranny shop
too new i guess

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SMOKEmUP
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1979 Chevrolet Camaro

PostPosted: Fri Aug 20, 2010 3:54 am    Post subject: Reply with quote

I'm leaning towards the 4L80E for the reasons you mention. However the 6L80E is tempting still.

Here's some information I found:

Trans.....Overall Length.....Length to Mount.....Weight
4L60E.......31-1/2................21-3/4...................134 dry
4L80E.......32-5/8................26..........................174 dry
6L80E.......29-1/4................25-3/4....................213 wet

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clay
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1972 Chevrolet Nova

PostPosted: Fri Aug 20, 2010 10:11 pm    Post subject: Reply with quote

On the 6L80E, could you program a controller to launch in 2nd gear? This would be very close to a TH400 (2.4Cool. I'm not familar with the LY6 engine, exactly what is it? What about running the engine with a stand alone computer like the Megasquirt and using the transmission you had in the car? Just another thought. Clay
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Big Dave
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PostPosted: Fri Aug 20, 2010 10:25 pm    Post subject: Reply with quote

With my 4L80e I rarely ever get it into fourth before the line in the quarter, and this is with 4.56 gears. (if I get a lot of wheel slip third gear becomes my second and OD is my final drive as first gear blows the tires off from any RPM and the 4L80e will shift out of first faster than any other transmission I have ever experienced.

Big Dave
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SMOKEmUP
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1979 Chevrolet Camaro

PostPosted: Sat Aug 21, 2010 3:09 am    Post subject: Reply with quote

Clay the Ly6 (6.0 liter) engine is a newer version of the LQ4. It has a 58x crank trigger wheel, variable valve timing (vvt timing chain config), some have displacement on demand (different lifters required), with the newer generation ECU.

They also have the L92 which is the truck version of the LS3, all aluminum 6.2 liter.

All very tempting. However may just buy an older LS1 / 4L60E combo and hot rod that on the cheap.

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Paul P
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1971 Chevrolet Chevelle

PostPosted: Mon Nov 04, 2013 5:51 pm    Post subject: Reply with quote

Alice707 wrote:
It's a complete motor but has low compression in a couple cylinders. If it's free I'll take it and use it as a mock up to get an LSx engine bolted into the 79Z.


Question Rolling Eyes What field is this coming from?

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clay
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1972 Chevrolet Nova

PostPosted: Mon Nov 04, 2013 6:23 pm    Post subject: Reply with quote

Go back to wonderland Alice..........bye bye
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