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Daniel writes:
Hi Sajeev,
I'm a long time reader, first time writer. I have a question which no one seems to know the answer to so I figure you and the B&B can have a go at it. I have a good condition spare turbo laying around from my MR2 turbo before I upgraded. I want to install this into my toyota previa. The problem is the area where the turbo will sit it will be exposed to the elements under the car ( rain, snow, salt) the way the exhaust manifold sits I have no choice. What sort of problems do you think I have in the future with the turbo being exposed like that? I'm in Chicago and this will be driven in winter. And the van is lowered too so the turbo will be pretty close to the ground.
Sajeev answers:
Your problem has very little to do with the turbo's location. It has to do with the fact that you have a free turbo and now want to build a turbocharged van around it.
Since the factory supercharged Previa has a different engine (2TZFZE) than the base model with a naturally aspirated (2TZ-FE) engine, there's a lower compression ratio…for starters. Engines designed for boosted applications often have stronger pistons, rods, cranks, unique cylinder heads and sometimes even better oiling/cooling systems. Odds are the Previa's two engines show a similar disconnect.
And we haven't even touched on fuel system upgrades, ECU tuning, new exhaust, etc. So sell the turbo on eBay or craigslist.
Your van sounds pretty bad-ass. So if you really love the beast, use the proceeds of the turbo's sale for a supercharged Previa donor van. Because it is way easier to upgrade when you have the entire conversion kit already assembled in a donor vehicle.
Which is sort of what I'm doing with my Ford Sierra…oh my, perhaps I've said too much…
Send your queries to sajeev@thetruthaboutcars.
from The Truth About Cars http://www.thetruthaboutcars.com
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