Dash Goes BPU... And it's going be a lot of work!
Dash only came in for a service. However, an inspection revealed that his turbos were leaking oil and pushing the oil into the engine. It was everywhere...
Bad news: the turbos would have to be repaired or replaced. And we were worried that if it wasn't done soon, he'd need more than new turbos!
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Dash dealt with this news in true Supra-enthusiast fashion: he used it as an excuse to upgrade his turbos
to hybrids and to turn his 350bhp Supra TT into a BPU monster!
But unfortunately our worst fears were realised. Oil had been forced into the engine over a long period of time and had caused major carbon deposits. We were going to have to rebuild the head too. |
Not pretty...
Although Dash already had aftermarket exhaust, gauges and a Walbro fuel pump, we still had a lot to do...
- Hybrid turbo conversion and installation
- Fuel-cut defender
- FSE
- Fit decat pipe and 1.2 bar restrictor ring
- EGT gauge probe installation
- Front mounted intercooler (and make pipes as required) installation
- Electronic true twin conversion with in-dash switch
- Head rebuild
- Service (to include new Denzo IK24 sparks)
The hybrid turbos conversion involves taking the stock Supra twin turbo unit and replacing the internals with much stronger components that can safely handle higher boost. How do we get more boost? Simple, just decat the car. Of course, if you decat completely, the boost goes way too high, so we need to use the restrictor ring to cut the boost back to 1.2 bar.
But even at 1.2 bar, there are issues we need to deal with. For one, the ECU in the twin-turbo Supra shuts off the fuel supply if it detects boost levels going over one bar. This is a safety measure. But since we want to run to over one bar, we need to circumvent this feature using the fuel cut defender modification. Additionally, we need to install an FSE: an adjustable fuel pressure regulator. This improves on the stock Supra TT fuel regulator and allows us to get more fuel to the injectors. (When you run more boost, you need more fuel!) The FSE also improves throttle responsiveness.
More boost means more pressure and more pressure means more heat. Heat is the enemy of performance, so we needed to replace the stock side-mounted intercooler with a big fat front-mounted one. We're also fitting an new EGT probe, since it's always wise to keep an eye on the temperature when you're running more than stock boost.
Check out Part 2 to see us take apart Dash's engine, clean it up and put it together again. Also take a look at the great cosmetic changes, both in the engine bay and the cockpit!
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