suzuki intake and TB swap from 91+ to 89-90 car

[fixkick]

Thank you for reply,  IN RED

To overcome the differences like you said that 89-90 has vacuum advance hose and 91+ has not,
yes I solved that by using old hose splitter to create the same ported  vacuum on a distributor.   NO  sorry, Vac advance uses TB ported vacuum only.
The 91 TB has no ported vacuum port at all, and is needed to make the Vac advance work correctly and not BACKWARDs
why not keep the 89/90 TB??????
but the EGR  vsv nipple port on the TB, newer, it is ported too, and I think the correct way.


So my old ECU will get the same data as has before, (the older ECU  does not every ever create or control spark in any way)

then you mentioned that old ISC worked on 6 Ohm and new is 12 Ohm, for me I am not expert,  this is  DCR, DC resistance the signal is 200Hz square wave
and the impedance is what matters here , the point is 2 fold here,  80/90 TB can burn up a 91+ ECU on ISC pins. and point to, the ISC may be slower
using 91 TB on 89 ECU, due to wrong impedance. (or DCR) the currents will be 2 time less and may cause ISC to be slow and worse the 50% duty cycle at idle not possible, but not ever tried by me this is the chain of pitfalls on swaps. wrong. theories or facts.



but when I looked up in my old  notebooks from school, I calculated that old ISC unit was taking 2 Amps 12V from the system and new one will be taking current 1 Amp 12V, but voltage stays the same, and that was very good point you mentioned that.

the new TB ISC will be slower, and draw  2x less current, and may render it useless the ISC, or very very hard to calibrate 800 rpm hot duty cycle. per manual.

And why do you think that distributor will not work?  (simple answers) but way are you asking this , you put the 91 head on 89/90?


it is the same firing order and ok maybe I have to play with the timing set up instead of minus 8 defrees before I will have to come up with different  approach, but as far as I know if camshaft is running clockwise and distributor gear is running anticlockwise its the same on both 89-90 and 91+  engines and they should have the same speeds /same number of teeth (13 there are 91+) and diameter/, I do not see any reason why I could not get any spark in the right order to the cylinders they should be identical.
this answer totally confuses me. (well gee can not see your engine and for sure all things swapped or not)
the answer is the 89/90 ECU can never ever run any 91+ Distributor, ever.
1: the 89/90 ecu has not spark generator parts inside, no cmp pin , no ignitor pin and no spark BRAINs at all. INJECTION ONLY ECU here.
2: the 91 distrib  only has one part inside, a CMP, hall sensor  and not anything else (besides cap /rotor)
3: the 80/90 has vastly more parts inside,  VR sensor, ignitor, vac, advance, centrifugal advance, and the ignitor runs the SPARK coil directly
4: the distrib mounts are  the same , the cam is not the same, as may that gear on the end , no work, swapped.
but is moot point gears the 2 distributors are not  the same at all even if spins ok.  

The 89./90 vacuum advance needs ported vacuum.  no newer car has, 
the 89.90 injector has its own connector 2 pin, not passing through the 6 pin as seen on 91+(this im sure confuses you this)



Thank you for your advice

so the 89/90 engine now has  91+ head? with 91+ distributor that we know will never work!
the hose 32./33 is ported vacuum.  and is modeled for EGR flow rates first, then used for  vacuum advance.
ported vacuum is 0Hg at idle, then as you advance the throttle vacuum rises, to increase EGR flow and retard spark/.
if you use the wrong port the vacuum advance is now backwards. (invertered) and vary bad that.