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RE: 4000 turbo conversion advice
On Sun, 13 Dec 1998, Bruce Bell wrote:
> I'm probably the culprit that did the most to perpetuate this false myth.
> Confusion stemmed from the '84 4kq's short gears in the tranny compared to
> those of the later cars. Comparing the published gear ratios of those cars
Do you mean to tell me that they all have 4.11s but that the later
cars have different gears in the Tranny? I know driving around in the 85'
and 87' seems to be different than in the 84' as the 84' seems to turn
higher RPM's on freeway and 1st doesnt seem to go as long. It could just
be me I spose but do you know what the differences in gearing (if any)
are? I know the Tranny Fluid Capicities are different on the 84'.
> to the observed mph/1000rpm numbers in the later cars make it appear that a
> 3.89 with 3.60,2.13,1.46,1.07,.78 are correct. Nope. Chris Semple reported
> that he had counted the teeth on an '87 4kq ring and pinion and found the
> gears were indeed the 4:11. In a strange moment of arrogance I countered
> this suggesting extensive highway testing had convinced me that the correct
> gears were 3.98. More humble now, after having counted 4+ turns of the
> driveshaft to one full turn of the wheel, I can confirm that my '87 special
> build is indeed equipped with 4:11 gears.
Thanks for coming forward in this. Nice to hear some "facts" if
you can call them that. Also, while on this thread. Does the 85-87' 4kq
have different gearing again than UR-Q? WHat about 5ktq. I know the 5ktq
has 3.80 or 3.89 Final Drive but is the tranny gears the same as UR-Q or
are they different too.
Boy, so many questions. Heck, while were at it. I believe
Sprongle runs a Stock 84' gearbox when he runs in the states with the
lower power? I know he uses a 4kq unit but does he use 84' or newer
(Disregard if indeed the same). Also, anyone have a clue what the
Competition box he uses runs. (Crash Box???, I'm guessign so?) Thanks