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940 Turbo Upgrade Help Needed 900 1994

posted by  Brian S on  Wed Apr 28 14:57 CST 2004
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I don't have any first-hand experience with turbo rebuilds/upgrades, but I'll try to give you what I know on the matter.

First - the HP numbers look like the point at which the given turbo would become inefficient, assuming the engine had the supporting modifications (additional fuel, air, and exhaust flow) to make that level of power.

Second - the turbos. I don't really know much about the T28... and you've already experienced the performance of the stock TD04-13C. The 15G is probably a good choice if you're considering a few more basic modifications (slightly increased boost, free-flowing exhaust). It should spool up about as quickly as your stock turbo. If you've really got the bug, the T3 would be the better choice. It would probably be laggier than your stock turbo, or the 15G, but would have more upside once you get past the most basic mods.

Third - whatever you end up doing, you sound like a candidate for a manual boost controller. This device will dramatically quicken turbo spool up, even if you keep the stock maximum boost. Important to also install a calibrated boost gauge so you can see what you're doing.

- Brian '93 945T... mbc @ 9 psi






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