Camshafts and gearing

Chris · Post by **Chris** » Sun Jun 26, 2005 12:13 pm

Does anyone know the effects of the cam used with the 4 speed transmission? From the FSM it appears that the lift is .016" less than the cam used with the 5 speed, 6 speed and auto trans. I have no idea what the timing specs are on either cam.
How would using a 4 spd cam work with the other transmissions and how would using the 5 spd cam work with the 4 spd transmission?

Also...does anyone have the gear ratio specs for the earlier 44,52 and 54F transmissions as well as the later 45,46, 53 and 54F transmissions? What are the differential ratios used in the sedans using the 4spd, 5 spd and auto transmissions?

I know it's alot to ask, but any info would help. I have several of these cars and want to use the best of the parts to keep my 3 road-worthy Tercels running at "peak" performance.

Thanks alot
Chris

Typrus · Post by **Typrus** » Sun Jun 26, 2005 3:50 pm

I'd think higher lift would add some oomph somewhere in the range, as it can breathe better. You really want a fun project, make one of those VTEC cams work lol.

shogun · Post by **shogun** » Sun Jun 26, 2005 3:57 pm

want some more grunt, use a 3asu cam

GTSSportCoupe · Post by **GTSSportCoupe** » Mon Jun 27, 2005 7:24 am

Chris wrote: Does anyone know the effects of the cam used with the 4 speed transmission? From the FSM it appears that the lift is .016" less than the cam used with the 5 speed, 6 speed and auto trans. I have no idea what the timing specs are on either cam.
How would using a 4 spd cam work with the other transmissions and how would using the 5 spd cam work with the 4 spd transmission?

Also...does anyone have the gear ratio specs for the earlier 44,52 and 54F transmissions as well as the later 45,46, 53 and 54F transmissions? What are the differential ratios used in the sedans using the 4spd, 5 spd and auto transmissions?

I know it's alot to ask, but any info would help. I have several of these cars and want to use the best of the parts to keep my 3 road-worthy Tercels running at "peak" performance.

Thanks alot
Chris

I would just use the cam with the most lift on which ever car you will be driving. I don't see why the gearing would be related. I guess the cam with more lift will give you power at a little bit of a higher rpm. Probably not noticable though.

Cams from a 3ASU or 3ALU should give you quite a bit more power (although with sacrifice of low end torque).

Where in the FSM did you get the cam specs? That is interesting.

As far as the transmission ratios go, go to our main page (http://www.tercel4wd.com) and download some of the brochures. They have ratios for a few of the years in there.

GTSSportCoupe · Post by **GTSSportCoupe** » Mon Jun 27, 2005 8:14 am

shogun wrote: want some more grunt, use a 3asu cam

shogun, any chance you could sell me one of those cams?? We never got the 3ASU engine in Canada, and our engine importers only sell a whole engine (which I don't want or need).

shogun · Post by **shogun** » Mon Jun 27, 2005 11:49 am

right now the ones i have are 3ascv i dont know if those will work for you, the 3asu i jus tpu in mu head, this month im turbo charging

Chris · Post by **Chris** » Wed Jun 29, 2005 10:00 am

I guess I should have been more specific...my definition of peak performance is most miles per gallon. Since this is an economy car I don't want to put in alot of money doing things like VTEC cams, etc.

The specs for cam lift is on page EM-26 in the 83 FSM, or EM-25 in the 86 FSM. It give the base circle plus lobe height dimension. Assuming the base circle diameter is the same for the two cams, the difference in lift would be .016".

shogun · Post by **shogun** » Wed Jun 29, 2005 12:27 pm

what are the diferences between the 3asu and the 3ac somewere i read that the 3ac stock part is 193 degrees in duration and about 9 mm in lift

Mac · Post by **Mac** » Fri Jul 01, 2005 4:41 pm

are you 100% sure the 3A-SU cam will work in the 3A-C? what else would work?

i also looked up the specs for the 3asu and it makes its peak torque at 4000RPM, thats 1600RPM higher than the stock 3a-C, however it produces 14 extra ft/lbs, hopefully the engine will still have enough torque to work the 4WD system.

Typrus · Post by **Typrus** » Fri Jul 01, 2005 9:25 pm

Turbo-charging? What all you modding? You custom-making crank, con rods, pistons or any of that?

How does it change the power in that way? What other mods would it allow to be done?

shogun · Post by **shogun** » Sat Jul 02, 2005 12:54 pm

im making it work with a carb and stock internals for the time being, just until i finish gathering my megasquirt efi pieces so i can run inyection, and tune it to perfection

the power curve if you get a right size intercooler or a supercharger from a 4agze it copuld begin at very low rpms frmo then is how you tune the car that it is going to work