3.1L Intercooled Turbo LG5 Engine Specifications
| Engine Description |
3.1L 60 degree V6 Turbocharged |
|
| Horsepower |
205@5200 |
| Torque (ft-lbs) |
225@2100 |
| Top Speed |
128 mph |
| Max Engine Speed |
5500 rpm |
| Block |
Cast Iron |
| Heads |
Aluminum |
| Valves |
12 |
| Displacement |
3.1L (3100cc, 192ci) |
| Cylinders |
6, V formation, opposed 60 degrees |
| Bore |
89mm (3.503") |
| Stroke |
84mm (3.3122") |
| Compression
Ratio |
8.8:1 |
| Fuel Management |
MPFI (Multi Port Fuel Injection). Electronic, controlled by ECM |
| Fuel |
Premium unleaded, 91 pump oct. |
| VIN code |
V |
| Usage |
1989-90 Grand Prix Turbo, 90 STE Turbo |
| Type |
Gen II - Same motor as 2.8L with an increased stroke |
Turbo Details
| Turbo |
Garrett T-25, water cooled |
| Model # |
TB2528 |
| Part # |
465939-2 |
| CHRA # |
431876-29 |
| Wastegate |
Vacuum, actuated by ECM-controlled solenoid |
| A/R Ratios |
0.68 Turbine; 0.80 Compressor |
Engine Management
| ECM Type |
GM 1227727/16197128 (underhood) |
| MEMCAL (PROM) |
256kbit (32kbyte) |
| MAP Sensor |
2-bar |
| Fuel Injection |
Multiport EFI, bank fired (two banks) |
Performance - 1989 GP Turbo
| 0-60 |
7.0 sec |
| 1/4 Mile |
15.3 @ 89.5mph |
| Top Speed |
128 |
Unfortunately, this engine never made it into a J-body. It was only used for two years, in the 1989 and 1990 Pontiac Grand Prix TGP. Another unfortunate thing is that they only made about 1000 of these cars each year, so they are quite rare and hard to find. If you can get ahold of one, the engine will be pretty much a direct swap into your 2nd gen J-Body.
Some info obtained from The W-Body Page
