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Toyota Previa HI Turbo
Before Toyota announced the availability of the Supercharged Previa we were seriously looking into Turbocharging one. Unfortunately- no one wanted to lend us one. And Toyota Previas were having a cooling problem. When we first drove the factory SC model, we were expecting a lot more and were unimpressed. The comparison was just begging to be made, which was better- turbocharger or supercharger! After some research, an IHI RHB6 looked like a perfect bet to go heads up against the factory SC14. One day we were doing an oil change on a Previa- and looking from underneath the vehicle with the slanted engine- I made a bet with the owner. I bet that I can install and have the turbo running in 48 hours. Deal. And yes it was running in 48 hours. And yes, it blew away Toyota’s SC model at only 7 psi. The major technical challenge was mounting the turbo high enough to drain properly. Since the engine was already on it’s side- there was less than 10 inches of room to position the turbo and have it drain properly. Oil coming from the turbo is whipped oil- and we had to design an oil accumulator to liquefy the oil to drain properly. We ended with a 12 inch tube that acted both as accumulator/liquefier and the actual drain to the oil pan! Additional fuel was thru an HKS AIC (Additional injector Controller) and ignition upgraded with HKS Twin Power. Several weeks later, in an accident- the engine overheated. We changed the pistons to the factory SC units (bored .50mm over), upgraded to SC injectors, and cranked the boost to 15 psi! It pulls like a 5 liter- from 2400 RPM when the boost starts.
The heavier the Previa was loaded- the nicer the turbo performed. Advantage Turbo. Suspension is by WAYDO from TRD. Wheels are Blitz Type03 17X8 225/45-17, 17X9 235/45-17
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