2015/06/03 11:38:20
Cash
Btw is there any difference bw gen2 n gen3 3sgte beside turbo sizes? Ta
2015/06/03 13:00:43
dasic1
Basically everything is different.
Block
Head/cams
Manifolds
Sump

Some things can be interchanged but most can't
2015/06/03 13:07:45
Carmikey
Cash
Btw is there any difference bw gen2 n gen3 3sgte beside turbo sizes? Ta

Japanese MR2 turbo information: differences and similarities

Revision dates
  • Revision 1 begins about Oct 89
  • Revision 2, about Jan 92 (SW20-0059266 onwards)
  • Revision 3, Oct 93 (SW20-0087386 onwards)
  • Revision 4, Jun 96
  • Revision 5, Nov 97 (ends sometime in 2000)The big revisions were revision 2 for the chassis and revision 3 for the engine (and ABS). The rest were mainly cosmetic.
     
    Model codes
    The model code for my 94 revision 3 Japanese MR2 GT (turbo) is E-SW20 ACMZZ. The chassis number is something like SW20-0093123.
    SW20 is commonly used to mean 'mark 2 MR2', even though in some markets some non-turboed mark 2 MR2s had the SW21 prefix. The turbo engine in the MR2 turbo is known by the code '3S-GTE', but note there are a good few 3S-GTE variants used in different cars over about a 15 year period.
     
    Differences between revision 1 & 2 engines and revision 3
    Just a quick list, do not take any of these as gospel:
  • position and orientation of oil filter changed.
  • different internal engine parts, e.g. pistons, con-rods etc.
  • turbo charger changed from Toyota CT26 to CT20B (same intercooler though).
  • boost pressure raised from about 10 to about 13 PSI.
  • power output raised from 220 to 240 BHP.
  • compression ratio slightly lowered.
  • injector size increased from 430cc to 540cc.
  • fuel cut threshold raised from about 12 PSI to about 18 PSI.
  • head and inlet path completely redesigned. TVIS removed, 8 'independent long ports' reduced to 4.
  • throttle body increased from 55mm to 60mm.
  • inlet valve lift increased from 8.2 to 8.7.
  • different, smarter engine ECU, more tolerant of poor fuel, different connector pin out.
  • air flow meter removed.
  • intake manifold inlet air temperature sensor added. i.e. after turbo and intercooler.
  • ECU now modulates the turbo VSV to achieve variable control of boost pressure rather than either open/full or closed/reduced.  Control of boost now quite subtle when ECU is unhappy because of      temperatures, detonation, speed, etc.
  • location of valve shims moved (someone said this was to stop problems with them falling out). If the manual is to be believed, this makes adjusting the valve clearances a much bigger job as on the revision 3 it involves removing the camshafts (might as well replace the timing belt whilst you're at it).
  • exhaust valve clearance increased by 0.08 mm (probably. valve clearances is one question I'd like answered direct from Japan. They are probably the same as the UK GT4s, but it would be nice to be sure).
  • oil pan changed from a one piece pressed steel part to a two piece affair, the upper half being aluminium, the lower half being pressed steel.
  • No. 1 compression ring now described as 'stainless steel' in GT4 manual/supplement instead of just 'steel'. Oil      ring is described as 'stainless steel' instead of 'a combination of steel and stainless steel'. No. 2 compression ring remains described as 'cast iron'.
  • idle speed perhaps slightly reduced (need to check this out on a rev 1 or 2 car, my stickers say 750 rpm, I've a feeling rev 1 & 2 was 800 rpm).
  • exhaust part numbers changed. Revision 2 part number for the front pipe is superceeded by the revision 3 front pipe part number. Back-box part numbers different. Unknown to me whether they are actually different.
  • Coolant drain plug added on cylinder block (on older engines the manual says to disconnect a by-pass hose when changing coolant).(Please note a lot of significant chassis improvements were already made for revision 2, although revision 3 ABS is probably much improved including the addition of an accelerometer.) Its rumoured that the USA never got the later improved engines, even though the american version of the MR2 turbo was sold there until 1996 (in very small numbers after 1994 though).
    Chassis number SW20-0087386 and onwards have the newer engines according to the Toyota Electronic Parts Catalogue for the Japanese MR2 turbos.
     
     
    Differences between revision 1 and revision 2 chassis
  • Diameter of front brake disks increased from 258mm to 275mm. Thickness increased from 25mm to 30mm. Allowable wear increased from 1mm to 2mm.
  • Diameter of rear brake disks increased from 263mm to 281mm. Thickness increased from 16mm to 22mm. (Allowable wear remains at 1mm.)
  • Front tyres changed from 195/60 14 to 195/55 15.  Rear tyres changed from 205/60 14 to 225/50 15. Compact spare also changed due to bigger brakes.
  • Suspension/steering geometry changed.
  • Front strut bar changed so that caster is no longer adjustable.
  • Speedo changed to use an electronic sender and not a mechanical cable. 
    Hope this helps.




     
    • 2015/06/03 13:27:06
    Mrskylighter
    And just to add a bit more info to the thread a generation 4 and 5 3sgte exist. (Both were never factory fitted to an MR2 though)
    The ST215 Caldina had the gen4
    The ST246 Caldina had the Gen4 and then Gen5 in the second revision. 
     
    The Gen5 was the last 3sgte version ever made.
    2015/06/03 14:26:22
    Cash
    Thank you guys very helpful.
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