B48E Turbo retrofit guide. CLICK ME FOR THE RETROFIT GUIDE
For turbo/engine setups aiming for over 500WHP, Nitrous injection or a compound turbo setup is recommended to reduce turbo lag. The IM500 is currently the highest output bolt-on stage 2 turbo for the B4x.
Upgraded turbos require a custom map and can max out the stock HPFP and injectors depending on fuel used and climate. Custom manifolds are expensive and time-consuming. A/R turbine housing is important when fitting an aftermarket turbo, and a twin scroll housing + twin scroll (divided) turbo manifold is recommended to ensure optimal spool up. For setups up to 550WHP, a 0.64 A/R turbine housing is sufficient, while for setups up to 750WHP, a 0.72 turbine housing is recommended. Modifying the stock manifold to suit a conventional turbo setup is a cheaper alternative to making a custom turbo manifold.
It is recommended to use internally waste-gated turbos for the platform, stick to using the factory DME for tuning and management. Port injection is required for setups over 420WHP because there is no "stage 1 or 2" DI injectors. Keep the setup simple, and use the EWG setups to avoid "boost creep." Custom fabrication is required for oil and coolant lines for the turbo in any custom turbo setup.
B48 Gen 1OEM Turbo Specs Part No. TD04LR6W-04HR*13HE1T11:
| Turbine Housing Size | 6CM2 or 0.41 A/R |
| Compressor Housing Size | Unknown |
| Compressor Wheel Size | 42.00/56.02 mm 6+6 Blade |
| Turbine Wheel Size | 41.2/47.2 mm 11 Blade |
| Bearing Type | TD04 Reverse Journal Bearing |
| Wastegate Type | Internal |
| Scroll Type | Twin Scroll |
| Max HP on 93 OCT (98 RON) | 305 |
| Max HP on E85 | 325 |
B48 Gen Pure Stage 2 (PS2):
| Turbine Housing Size | 6CM2 or 0.41 A/R |
| Compressor Housing Size | Unknown |
| Compressor Wheel Size | 47.00/58 mm 6+6 Blade |
| Turbine Wheel Size | 45.65/52 mm 9 Blade |
| Bearing Type | TD04 Reverse Journal Bearing |
| Wastegate Type | Internal |
| Scroll Type | Twin Scroll |
| Max HP on 93 OCT (98 RON) | 330 |
| Max HP on E85 | 370 |
B48TU OEM Turbo Specs Part No. MGT2056 (Garret GT2056):
| Turbine Housing Size | 0.57 A/R |
| Compressor Housing Size | 0.52 A/R |
| Compressor Wheel Size | 42.3/56 mm 9+0 Blade |
| Turbine Wheel Size | 41.7/47 mm 10 Blade |
| Bearing Type | Garret G Series Journal Bearing |
| Wastegate Type | Internal |
| Scroll Type | Twin Scroll |
| Max HP on 93 OCT (98 RON) | 315 |
| Max HP on E85 | 335 |
B48A20T1 OEM Turbo Specs Part No. MGT22Z (Garret GT2256KSZ):
| Turbine Housing Size | 0.61 A/R |
| Compressor Housing Size | 0.56 A/R |
| Compressor Wheel Size | 46/60 mm 6+6 Blade |
| Turbine Wheel Size | 44/54 mm 10 Blade |
| Bearing Type | Garret G Series Journal Bearing |
| Wastegate Type | Internal |
| Scroll Type | Twin Scroll |
| Max HP on 93 OCT (98 RON) | 360 |
| Max HP on E85 | 400 |
IM450 Turbo Specs:
| Turbine Housing Size | 0.61 A/R |
| Compressor Housing Size | 0.57 A/R |
| Compressor Wheel Size | 48/60 mm 9+0 Blade |
| Turbine Wheel Size | 49/54 mm 9 Blade |
| Bearing Type | Garret G Series Journal Bearing |
| Wastegate Type | Internal |
| Scroll Type | Twin Scroll |
| Max HP on 93 OCT (98 RON) | 400 |
| Max HP on E85 | 450 |
BBT Turbo Specs:
| Turbine Housing Size | 0.63 A/R |
| Compressor Housing Size | Unknown |
| Compressor Wheel Size | 49.5/61.5 mm 7+7 Blade |
| Turbine Wheel Size | 49.5/61.5 mm 10 Blade |
| Bearing Type | Journal Bearing |
| Wastegate Type | Internal |
| Scroll Type | Single Scroll |
| Max HP on 93 OCT (98 RON) | 400 |
| Max HP on E85 | 450 |
IM500 Turbo Specs:
| Turbine Housing Size | 0.61 A/R |
| Compressor Housing Size | 0.57 A/R |
| Compressor Wheel Size | 54/67 mm 9+0 Blade |
| Turbine Wheel Size | 49/54 mm 9 Blade |
| Bearing Type | Garret G Series Journal Bearing |
| Wastegate Type | Internal |
| Scroll Type | Twin Scroll |
| Max HP on 93 OCT (98 RON) | 440 |
| Max HP on E85 | 500 |