MR2 Technical Knowledgebase - Gen III Differences

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Created	2007-08-15	Views	2474
Modified	2007-08-16	Id	1
Author	Tech KB

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The Gen III 3S-GTE engine was introduced on the 94+ Turbo MR2 in the Japanese Domestic Market.

Here's a list of some of the documented changes from earlier 3S-GTE versions:

- MAP sensor instead of AFM
- Different ECU
- Bosch D-Jetronic (Gen III) vs. L-Jetronic (relatively primitive) engine management
- CT20b turbo replaces CT26
- Boost raised from 10psi to 13psi
- Fuel cut raised from 12 psi to 18 psi
- 4 wire O2 sensor
- Revised Head design - Shim under bucket valve shims
- Slightly more aggressive cams - Gen 2 = 236, Gen 3=240 & 0.5mm more lift
- Revised internals (pistons, con-rods etc.)
- Revised cylinder head cooling passages/water jackets
- Revised intake manifold (8 'independent long ports' reduced to 4)
- intake manifold inlet air temperature sensor added after turbo and intercooler
- Revised exhaust manifold
- Revised gearbox with close ratio gearing
- lower compression ratio
- stainless steel head gasket
- factory 540cc injectors replace 440cc injectors
- revised fuel rail with bigger bore and relocated pressure regulator
- The fuel pressure raised from 36 PSI (2.55 bar) to 41 PSI (2.9bar)
- TVIS eliminated
- EGR eliminated (on all JDM models, not just the Gen 3)
- LSD in 80% of them
- throttle body increased from 55mm to 60mm
- inlet valve lift increased from 8.2 to 8.7
- Less restrictive exhaust elbow
- Aluminum oil pan
- more rigid alloy sump and additional oil baffles
- Factory Catch can
- Better Oil Cooler and relocated oil filter (bottom)
- 4 Channel ABS coupled with Traction Control available
- Number 1 compression ring described as "stainless steel" instead of just "steel"
- Oil ring is described as "stainless steel" instead of "a combination of steel and stainless steel"

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