[Diy_efi] 4L80E into 6.2 diesel application

Tue Jul 15 05:00:58 GMT 2003

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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