ST185 GT4A - 1990, non ABS

There are a couple of Celica's up at Pick A Part (local scrapyard) and I'm looking at small upgrades for the ST185.

Brake Cylinder/Booster:
According to the EPC, various models of the ST20x came with the same master cylinder as the ST205.

Now brake master cylinders are different between the st185 and st205 according to the EPC and require the brake booster that matches up with each cylinder respectively.

What I am wondering is, is there any advantage to upgrading the brake master cylinder/booster to the st20x model over the st185.

I plan on running 4 pot brakes off a hilux surf or wilwood superlites (more likely the wilwoods).

I know there are diff bore sizes between the models, especially with ABS and the smaller bore on the st185 non abs, but what would be more ideal for my application?

http://www.gt4dc.co.uk/forum/viewtopic. ... r+cylinder

Clutch Master Cylinder:

Same goes with the clutch master cylinder. Is there any advantage in using the newer st20x equipment over the old st18x equipment?

I have st205 gear box, so can salvage the slave cylinder off there if required. I already have to get the release fork swapped over.

If anything, I want to at least swap over reservoirs as mine are discoloured.. unless someone knows how to make the plastic white again.

Makes me wonder why I just didn't buy a ST205 from the beginning of this whole thing

Thanks
Dave

_________________
GT Four Adovansu

"I want to enjoy the powerful and nimble agility behavior."

some people have had long pedal issues after fitting 205 calipers to a 185. I'd imagine you'd have the reverse - a short pedal.

Saying that some report very little difference so I guess it depends on exactly what you're swapping for what as there are a few different versions about. It might be a suck it and see exercise

Very true. Its a bit away in terms of getting if for the build, but it was on my mind at 4am (amongst other things preventing my sleep) so I thought I'd do my research now.

Maybe I'll wait for a gen3 3SGE to come along in the scrapyard and get the stuff then.. or whenever

There are a few 5SFE's around.. always makes me think of a stroker...
*slaps face.. stop it Dave.. one project at a time..

_________________
GT Four Adovansu

"I want to enjoy the powerful and nimble agility behavior."

Ooooh, 5SFE stroker, don't get me started

Just to further disturb your sleep Diceman and I were pondering the 3SGTE crank in the 5S block to give a 2.1L screamer.

Happy dreams

could do, but i believe the 5sfe crank in the 3s block with big ends turned down to 50mm (5s runs 52mm) allows you to use standard 86mm pistons (any std or aftermarket 3sge/sgte, 1 & 2 JZGE & JZGTE pistons) instead of using 87mm pistons.

I guy here on the local forums has done a stroker and chucked in an AE104 4wd corolla sedan for racing with a st215 engine.

As he says, easy to source stuff and get it together, but as my friends say, I need to finish one (of many projects) before I'm allowed to think about other projects.

Then again, thinking about Pat Chinsue's 2.4 stroker......

Oh and I figured out how to stop the vibration when swapping over over to st205 brakes on the st185. Use the st20x rear hub. Its the same according to EPC. Just random info lol.

edit - maybe not looking more indepth at EPC.. i think i'll just have to get a hub/bearing assembly from st202 and press the hub out..

edit 2 - duh. I was looking at the front hubs, which is why I got confused. Same bearing used. Then I thought.. use front hubs in place of rear hubs on 185 from 20x.. prob solved

_________________
GT Four Adovansu

"I want to enjoy the powerful and nimble agility behavior."

but there are 87mm pistons out there so they can be made to fit the 5s block. Biggest problem is trying to make the 3s crank fit 5s journals. That will require ingenuity (or more likely a CNC mill and line boring machine)

You should hear the really stupid conversations I've had with JP about toyota 2.4l 4 pot diesel blocks........ That conversation requires beaucoup de vin rouge

I guess I better get some more vino in now toyota do a 2.4 vvti petrol engine

_________________
JP
GT4DC Treasurer

Grey St185 RC
Silver BMW E46 M3
Multicolour yawn Honda VFR400
Silver Honda Civic Type-R

I realise that there are 87mm pistons available, but I was talking about that 86mm because they are more commonly available especially with supras and the like using them - therefore potentially cheaper.

How about using the 5S crank instead of the 3S?

Funnily enough, there was a toyota cavalier up at pick a part with a 2.4. Then again, I'm not sure I could bring myself to touch that machine

Maybe we should divide this topic up into discussion on 5S stroker. I'm sure that the discussion will lead to what the yanks are doing with the MR2 scene and what people are doing to get 2.4 out of the 5S blocks.

_________________
GT Four Adovansu

"I want to enjoy the powerful and nimble agility behavior."