[Diy_efi] 4L80E into 6.2 diesel application

Tue Jul 15 19:41:26 GMT 2003

Exactly why I want to go to an OD trans. Plus the noise reduction in the
front seat will be super welcome. I don't doubt that gears will be done
later, but want to see where we're at first.

I'm running 285/75r16s, so around 33-34" tall give or take. The cheap
alternative to gear changes (it needed tires anyways). :)

I have a non-TCC TH400 now. It's a 15,000# vehicle loaded, plus 4-5K towing,
so a 700R4 would be a time bomb waiting to go off. Too bad, I have two nice
ones I could be installing, and they don't need electronics massaging.
Plug'n play with a TV cable & bracket from a later model. Apparently in HD
apps behind 6.2s, the input shafts get broken off as well.

It's a shame since the current TH400 actually runs quite well. I can't
spending the $$ for a Gear Vendors and having one more thing to maintain.

Eric

> -----Original Message-----
> From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org]On
> Behalf Of Ray
> Sent: Monday, July 14, 2003 9:49 PM
> To: List for general do-it-yourself EFI talk
> Subject: Re: [Diy_efi] 4L80E into 6.2 diesel application
>
>
> What do you have for a tranny now?  I looked up the specs on the advanced
> adapters web site and noticed that the 4L60E has a lower first and second
> gear than the 4L80E.
>
> I ran the numbers through my gearing calculator and found that you can
> probably hit 80 or 80 MPH, but your engine will be tearing itself apart
> (assuming 30 inch tires).  I didn't try the numbers with a
> different ratio.
>
> Anyhow, your engine speed at 70 MPH is about 2700 RPM.  That's pretty
> fast -- especially for a diesel.  For reference, our minivan turns about
> 2000 at 70 MPH, and it has a little V6 gasoline engine.  My Grand Wagoneer
> turns a little faster, but it doesn't have an overdrive (something that I
> want to rectify in the near future).
>
>
> Ray Drouillard
>
>
> ----- Original Message -----
> From: "Eric Deslauriers" <eric.deslauriers at oracle.com>
> To: "List for general do-it-yourself EFI talk" <diy_efi at diy-efi.org>
> Sent: Monday, July 14, 2003 11:23 PM
> Subject: RE: [Diy_efi] 4L80E into 6.2 diesel application
>
>
> > They came with 4.56s back then - when the speed limit was 55.  And with
> 255
> > ft/lbs peak stock, the stumps are pretty darn tiny. LOL
> >
> > She does 55 just fine - on the flats. But at 10mpg w/ my foot on the
> floor,
> > a leaking throttle shaft, a hosed pump, & worn out timing
> chain, who am I
> to
> > complain? For reference, some other fellow gets 16mpg with his (same
> model,
> > year, etc.). How's that for an early 80s class A MH? My last '86 gasser
> got
> > 7 on a GOOOOD day and more likely 5-6.
> >
> > A gear change may be in order, but tranny or turbo first, next
> one second.
> > Then we'll see if I need gears.
> >
> > I figure it's better to go OD than 3.07ish or 3:21ish (think it's a corp
> 14,
> > not sure, could be D70) since the hills are long and steep
> around here & I
> > tow a car.
> >
> > Eric D
> > Porltand, OR
> >
> > > -----Original Message-----
> > > From: diy_efi-bounces at diy-efi.org
> [mailto:diy_efi-bounces at diy-efi.org]On
> > > Behalf Of Ray
> > > Sent: Monday, July 14, 2003 7:49 PM
> > > To: List for general do-it-yourself EFI talk
> > > Subject: Re: [Diy_efi] 4L80E into 6.2 diesel application
> > >
> > >
> > > Why are you using such a low rear-end ratio?  You're going to end up
> with
> > > something that'll pull stumps (assuming you can get the
> > > traction), but burn
> > > out or blow up on the freeway.
> > >
> > > If you want to check your gearing, punch the numbers into
> this program:
> > > http://home.quixnet.net/~cosmic/GearCalc.htm
> > >
> > >
> > > Ray Drouillard
> > >
> > >
> > >
> > > ----- Original Message -----
> > > From: "Eric Deslauriers" <eric.deslauriers at oracle.com>
> > > To: "List for general do-it-yourself EFI talk" <diy_efi at diy-efi.org>
> > > Sent: Monday, July 14, 2003 10:09 PM
> > > Subject: RE: [Diy_efi] 4L80E into 6.2 diesel application
> > >
> > >
> > > > The 6.2 revs to the high 3K.  With Banks turbo, it puts out
> > > just under 400
> > > > ft/lbs. With a few more mods, it'll be in the 450-480 range.
> > > >
> > > > The tranny gear ratios are the same in GM applications.
> > > >
> > > > With low rear gears (4.56 I believe), 80 is about ready to have
> > > a rod come
> > > > out the side of the block.
> > > >
> > > > In my case, all I need to make the engine run is a hot wire to the
> pump.
> > > > That means if I need anything else for the tranny, I've some
> > > work ahead of
> > > > me since I don't have it.
> > > >
> > > > Eric D
> > > >
> > > > > -----Original Message-----
> > > > > From: diy_efi-bounces at diy-efi.org
> > > [mailto:diy_efi-bounces at diy-efi.org]On
> > > > > Behalf Of Perry Harrington
> > > > > Sent: Monday, July 14, 2003 6:31 PM
> > > > > To: List for general do-it-yourself EFI talk
> > > > > Subject: Re: [Diy_efi] 4L80E into 6.2 diesel application
> > > > >
> > > > >
> > > > > Jet makes a "Transconversion kit" for 4L80-E trannies.  It is an
> > > > > external computer
> > > > > that controls the transmission.  From what I know of Fords, the
> > > > > diesel trannies have
> > > > > significantly different gear ratios than gasoline.  The reason
> > > > > being that the diesel's
> > > > > don't rev very high.
> > > > >
> > > > > --Perry
> > > > >
> > > > > On Mon, Jul 14, 2003 at 09:04:47PM -0400, Ray wrote:
> > > > > > If you have the pinout of all the connectors, you can probably
> > > > > put together an analog shift computer that uses a few op-amps and
> > > > > some driver transistors.  You will need to send the engine speed
> > > > > and load into the computer.  If you want to have something a
> > > > > little better, adding inputs for things like engine temperature
> > > > > and road speed will help.
> > > > > >
> > > > > > In the mean time, you can always hook the harness up to a few
> > > > > switches and shift it manually.
> > > > > >
> > > > > >
> > > > > > Ray Drouillard
> > > > > >
> > > > > >   ----- Original Message -----
> > > > > >   From: Eric Deslauriers
> > > > > >   To: diy_efi at diy-efi.org
> > > > > >   Sent: Monday, July 14, 2003 7:54 PM
> > > > > >   Subject: [Diy_efi] 4L80E into 6.2 diesel application
> > > > > >
> > > > > >
> > > > > >   I have an 83 6.2 diesel I want to put a 4L80E behind.
> > > > > >
> > > > > >   Am I stuck buying the piggback computers, or is there
> > > > > something I can DIY myself? :)
> > > > > >
> > > > > >   Also, beyond torque converter and SW, is there anything
> > > > > different between diesel and gas 4L80Es?
> > > > > >
> > > > > >   Thanks!
> > > > > >   Eric D
> > > > >
> > > > >
> > > > > --
> > > > > Perry Harrington Data Acquisition &
> > > > > Instrumentation, Inc
> > > > > perry at dainst dot com
> > > > http://www.dainst.com/
> > > >
> > > > Those who would give up essential liberty to purchase a little
> temporary
> > > > safety
> > > > deserve neither liberty or safety. Nor, are they likely to
> end up with
> > > > either.
> > > >                              -- Benjamin Franklin
> > > >
> > > > _______________________________________________
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> > > >
> > >
> > >
> > >
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