2008 TCRA Seminar

• M/Y 2008 Overview of GM Torque Converter Changes• GM’s New 6 Speed FWD 6T40/45E Converter – 236mm• 6L90 – 300mm Torque Converter Enhancements• Turbine Damper vs Conventional Dampers• Torque Converter Principals of Operation (movie)• Future Trends

GM Torque Converters - M/Y 2008 Summary

245mm / 258mm 4T45E, 4T65E, 4L65E, 5L40/50E• No significant design changes • Production may end by M/Y 2010

258mm / 300mm 4L65E• No significant changes

310mm 4L85E • To be replaced 6L90E / 300mm in M/Y 2009 – 2010

236mm 6T40/45E• New Transmission & Torque Converter• Introduction to North America in Summer ’08 (Chevy Malibu, Saturn Aura)

246mm 6T70/75E• Continued rollout with no significant design changes

258mm/ 300mm 6L50/6L80/6L90• Rollout Continues • 300mm for gas 6L90E introduced

GM’s new Small FWD 6 Speed

GM’s new FWD 6 Speed6T40/45E

Features:• Driver Shift Control• Internal Transmission Electro-Hydraulic Control Module (TEHCM)• Performance algorithm – shifting• Electronic range selection compatible• TCC availability 1st – 6th gear• Neutral idle compatible• 5th Gear limp home strategy • Flat Tow Capability• 6.14 overall ratio: 1st gear 4.58, 5th gear 1:1, 6th gear 0.746• GM design and developed; Design rights sold to Ford• Engine Input Torque: 6T40 - 280 Nm, 6T45 - 380 Nm • K-factor range 160, 180, 205K (metric)• Engine Range: 1.6L – 3.5L• Max Input Speed: 7000 RPM• Manufacturing Locations: Boryung - Korea, Yantai – China, Toledo - Ohio

GM 6T40/45E Applications – M/Y 2008

Saturn Aura Chevy Malibu

GM’s new Small FWD 6 Speed6T40/45E

236mm TC

236mm Pump Asm

236mm Pump & Stator Asm

236mm Stator Asm – Pump Side

236mm Stator Asm – Turbine Side

236mm – Turbine and Drive Plate Asm

236mm – Pressure Plate and Isolator Asm

236mm – Cover Asm

6L90E – 300mm Enhancements

• All 300mm for 6L90E have brazed turbines– 6L80E does not braze turbine

• All 300mm for 6L90E have enhanced bearings:– Split Pump Side Bearing with Thicker Races– Thicker Turbine Side Bearing Race

• Single Face TCC is used for 6.2L gas (3 lugs)• 6.6L & 4.5L V8 diesels use:

– Twin Face TCC– 6 Lugs – New 292mm bolt circle and lug height

Split Bearing with Thicker Race

6L80 300mm

6L90 300mm

Thicker Race Bearing

Turbine Damper Comparison

Conventional Damper 258mm Turbine Damper 240mm

Torque Converter NVH Technology Overview

Turbine damper vs Conventional TCC

TEngine Piston Turbine Transmission

Clutch

Dam

per

InputShaft

OutputTm

fluct

+

Conventional TCC

Turbine Damper Clutch

Dam

per

InputShaft

Output

Engine Piston+ TransmissionTurbine

Torque Converter NVH Technology OverviewTurbine Damper vs Conventional TCC

Turbine Mode

Future Trends(where are we going?)

GM’s 2 Mode Hybrid – RWD / FWD