Converting 6th gen Celica GT to a GT-4

I will soon be converting my celica GT to a GT-4. It is a 95 GT
Convertible w/ a 5sfe (2.2L) engine. The 5sfe doesn't offer as much
power as I need. I'm trying to find a 3sgte (2.0L turbo), AWD tranny,
and the AWD drivetrain to drop into mine. I know that the 3sgte engine
lines up with the existing engine mounts in my car, and so do the
transmission mounts. What I do not know is if I can slap the rest of
the AWD drivetrain from a GT-4 onto my car and everything fits as
perfectly as the factory produced GT-4. I know that anything can be
made to fit though. I have run into some problems in doing this, the
holes in the firewall for the GT-4 are on the opposite side of the
firewall of the GT. This can easily be fixed by replacing the wiring
and wiring harnesses with aftermarket harnesses that usually come along
with an aftermarket CPU. I have figured up the approximate price to be
somewhere in the neighborhood of $4G if i do the work myself. Also,
does anyone know anything about dropping the V6 out of a camry into the
celica? I know the engine mounts line up on it also. If anyone else
knows of any other complications I can run into please let me
know...below is a list of things I am looking for and please respond if
you see that I have left out anything essential. It may be cheaper to
order stuff directly from japan considering i'm in hawaii, but whatever
works...but i don't speak japanese

-GT-4 front bumper and/or hood(needed asap)
-standalone engine management system w/ wiring harnesses
-3sgte engine even if it has to be rebuilt
-3sgte tranny (preferrably aftermarket)
-3sgte drivetrain
-performance engine parts:
--performance rods and pistons
--injectors (about 750cc)i heard supra injectors will work
--racing cams & camshafts
-header
-and the 3sgte or GT-4 lettering to replace the GT letters on the trunk
I feel like I'm forgetting something.

~Jay

IIRC the floorpan of the GT is different from the GT4, meaning you'd
have to cut out and weld in large custom sections of floorpan around
where the prop shaft goes. Theres a guy whos done it on gt4oc.net, a
greek guy i *think*, fair play to him it was no small task, basically
he started with a cut-up ST205 and his original ST and 'cut and paste'
welded floorpans and various chassis parts as they were not a direct
swap. The front end is identical, its the rear thats different, missing
various channels and stiffeners.

J

cause there's no fun in that josh, plus, its only RWD, i need AWD

Actually, Ray O, i think you are thinking of one of the japanese
engines that wasn't used in the US. As far as the GT-4 not being sold
in the US, I didn't know that. The engine...I can use one out of a
MR2, they aren't that hard to find. The tranny...I,m pretty sure i can
find an aftermarket one for the MR2 and make it fit my celly. Someone
else already gaveme some bad news by saying that i can't just "plug in"
the drivetrain to make it AWD without some major welding...sigh...I'll
do that later on down the road...maybe. Since the GT-4 was only made
in Japan i would have to do some steering conversions wouldn't I?
Where there's a will there's a way, and I've been researching this for
months and months and months...it can be done, and I will do it!
Thanks for the tips though

GT-two wrote:
> Since the GT-4 was only made
> in Japan i would have to do some steering conversions wouldn't I?
> Where there's a will there's a way, and I've been researching this for
> months and months and months...it can be done, and I will do it!
> Thanks for the tips though

The GT4 (ST205 (94+)) wasnt released in the USA - correct. The ST185
was released in the USA, you could use an engine from that but you're
starting on lower power.

Its only gonna be an engine and transmission transplant and not maybe
the front suspension setup but thats it TBH, i'd be happy to attempt
that, and its perfectly easy to run the stock mr2/gt4 ecu. That said,
running a st205 GT4 ECU you'd have to have the chargecooler setup
installed (extra rads under bumper etc) unless you want to start
routing front mounts around and clocking the turbo for a nice pipe
route.Oh and you'd have to fool the ECU into thinking the pump was
still there.

What steering mods do you think would be necessary? The GT4 (gen 6)uses
the superstrut shock system (rather prone to failure every 40-50K at a
cost of a good $1500), does the GT?

Anything can be done, and good on ya for giving it a shot, just dont
expect it to be at all easy lol.

Coyoteboy, thanks for the info on the st205 and the st185, i don't know
much about the st codes, st205 is the 3sgte GT-4? and st185 is my 5sfe
GT, right?. As far as steering goes, what i meant to say was that
since the GT-4 in Japan is RHD (right-hand drive) and I don't believe
any LHD's were made for export to the US or any other countries, but
this is just me guessing, I never looked up what coutries GT-4's were
exported to. If i owned a GT-4 then i would probably know. Anyway,
I'm thinking maybe it would cause some complications with dropping an
engine in that has only been produced with a RHD celica. Maybe there
is something that would get in the way of it, I don't know, I've never
done an engine swap with a different engine. And yes, I thought about
using the stock GT-4/MR2 ECU but i'd much rather buy a aftermarket one,
with the engine mods I am planning on doing to the 3sgte I don't want
to go with a stock ECU. There is a possibility that since the engine
would be sending out different info to the ECU than it did before it
could try to adjust for that, thus killing my mileage...possibly. Ok,
ok, thats just an excuse, i'd rather go with an aftermarket one just
because...lol

GT-two wrote:
and st185 is my 5sfe
> GT, right?.

Sorry, ive just added to the confusion. Yours is an ST202 or 203 i
think, any ending in X05 are GT4s, the old square shape is the ST16X
model, the pop-up lights and rounded model is the gen 5 ST18X and the
quad headlight model like yours are the ST20X's. So the GT4s are 4th
gen ST165,5th gen ST185, 6th gen ST205 and the lesser models just have
lower last digits.

> As far as steering goes, what i meant to say was that
> since the GT-4 in Japan is RHD (right-hand drive) and I don't believe
> any LHD's were made for export to the US or any other countries, but
> this is just me guessing, I never looked up what coutries GT-4's were
> exported to.

Now im seeing your point. Im not sure whether there were any LHD ST205s
either, however as far as im aware the engine bays of the 185s and 205s
are almost identical, and the 205 engine is almost identical to the 185
externally - so im guessing it wont be a problem for you.

> could try to adjust for that, thus killing my mileage...possibly.

PMSL - no-one going for a 3sgte is looking for milage (I get 18-20miles
per UK gallon at best lol)

Ok,
> ok, thats just an excuse, i'd rather go with an aftermarket one just
> because...lol

thats better. Should do well!

J

Coyoteboy, thanks for clearing up the ST codes for me...now i don't
have to waste precious time digging through the internet for the info
...18 - 20 mpg? u sure you're doing the math right? you guys go
by kpg right? i guess i can keep it FWD for the time being...sigh.
well, i guess i'll look around for an aftermarket tranny for the 3sgte.
let me know if you guys find any links to a 3sgte tranny, maybe for a
MR2 since it wouldn't have a center viscous coupling differential to
split the power and send it to the 2nd axle. Or you know what, the my
existing 5sfe tranny lines up with the 3sgte engine, but it can't
handle the power of a 3sgte, even though i have upgraded the clutch and
flywheel. So maybe i can find an aftermarket 5sfe tranny. Thanks for
the help guys, i'll try to keep you updated.

I dont need work at all, running 1 bar boost plus supporting mods 18-20
is an average figure and far from the worst ive seen on a good runner
(its been covered innumerable times on GT40C). Mine is used for
commuting 36 miles a day down a dual carriageway with many lights. On a
long motorway run, yes i can get 30-34mpg but only if im driving like
my gran at 60-65 without much acceleration.
Getting 24-27 is great, but you are an exception, not the rule, and
driving technique/environment may contribute to that. Even Mr2 turbo
owners rarely get that high a value with half the drivetrain and a
lighter car mate.

J

Ray O wrote:
> Toyota did sell an All-Trac Celica Turbo for a while although it was an
> earlier generation than the one you're working on.

They did, just not to you guys over the pond, Europe, Japan and i think
aus all got the 6th Gen "alltrac" (GTFour) And an awesome car it is
too, apart from its superstrut issues.

> As far as LH and RH drive, I don't think it will make that much of a
> difference.
> --
> Ray O

Seconded.

J