On 3 Performance BMW N54 335i Top Mount Single Turbo Stage 1 kit is more focused on the customer wanting to support 450 – 620 HP. The standard turbo for this kit is the On3 55mm GT30, which max out in the 500 HP range. To achieve higher numbers you can opt for the On3 61mm GT35 which will yield the highest HP for this setup. Both turbos are offered as standard journal bearing setups but can be upgraded to dual ceramic ball bearings. The best beneficial part of this setup is the exhaust housing is made from stainless steel and has v-band on both the inlet and outlet sides. With any tight engine bay, this is key to allow for endless adjustments. This will not only look great but when the install time comes, it will make life that much easier.
The manifold is a custom-designed 2pc setup. We have designed it from an extremely thick schedule 40 tubings and only use 304ss for the construction. By making this unique manifold, it allows for a much easier install. Most of the single top mount kits also require you to modify the factory coolant line as it’s routed through the same area where the factory turbos are. We took serious attention to detail and built around it so it retains the hard aluminum tubing. This is not a good area to run rubber hose as some systems do. Sure it would be easier but in the long run, we have a better design. Our manifold is designed to use ours On 3 Performance 44mm v-banded wastegate to control boost. Out of the box, your kit will be set up to make around 14psi on wastegate pressure. Coming out of the wastegate, we have it set up to atmosphere.
Moving the air out of the turbocharger, we designed 3″ downpipes from 304ss. This will take the gases back to the factory exhaust location and splits into duals. With each kit, we also include the necessary stainless steel v-band clamps to secure the turbo in place, downpipes as well as the needed clamp for the turbo manifold.
To address the cold side, coming out of the turbo we designed a short 2.5″ charge pipe out of the turbo to the massive 7″ core On 3 Performance air to air intercooler upgrade. In order to maximize power to redline, the IAT’s with the factory intercooler will become a problem. Airflow surpasses what the factory air to air will handle and start delivering hot air to the engine. As that warms up, the computer starts pulling timing and that will become a power loss. Cool the air with the new 7″ On 3 Intercooler and your not pulling timing, air temps drop and everything is good. Although that is all that is required to get the car running, we didn’t want to stop there. We wanted to improve upon what most see or already on the market. So we also designed a custom throttle body charge pipe to include with each turbo system standard at no additional cost. This is a 3″ polished aluminum charge pipe and also intergraded in our 50mm On 3 Performance blow off valve flange. Each system will come with the 50mm On 3 blow-off valve, this will not only sound good but fight compressor surge. Most will look at this feature and like it for the sound but its a very crucial piece to a turbo system to keep the turbo alive. Also hard to see but we do have the map sensor bung welded in so it’s ready for a plug and play install. Another touch that was not required was the power steering reservoir. We built a custom billet aluminum fabricated reservoir which contains a custom washable filter element.
- Custom Billet Oil Supply Fitting
- Custom Turbo Oil Restrictor Fitting
- Custom Billet Turbo Oil Drain (Into Engine Block)
- On 3 Performance 2 piece 304 Stainless Steel Turbo Manifold Vband
- 3″ 304ss 16 gauge Tig Welded Downpipe
- On 3 Performance 55mm GT30 Vband Turbocharger
- On 3 Performance Cast Turbo Exhaust Housing
- On 3 Performance Oil Feed System
- On 3 Performance Oil Drain System
- Billet Plugs Factory Water Ports
- Billet Plugs For Factory Oil Supply Ports
- Billet Plugs For Turbo Water Drain
- Billet Plugs For Factory Turbo Oil Drain
- 5 ply Silicone Coupler Kit
- Stainless Steel T-Bolt Clamp Kit
- Custom Billet Aluminum Power Steering Overflow Tank
- On 3 Performance Massive 7″ Core Air To Air Intercooler
- On 3 6061 Aluminum 3.0″ Throttle Body Charge Pipe
- On 3 50mm Blow Off Valve Kit
- On 3 44mm Wastegate Kit