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| iamane30m20nut
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| Posted:Nov 29 2003, 02:43 AM |
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| I drive a '90 325i. The engine is a 2.5L I6 with a compression ratio of 8.8:1. I have to use California gas, which is 91 octane. Anyway, here's my question: I need a medium size turbo for a custom install, but I can't figure out which turbo to use. I want it to be able to produce up to 12psi, but also not be laggy as hell. I already have most everything else figured out, this is the only thing bugging me. Thanks for your help. |
| Rodhog
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| Posted:Nov 29 2003, 11:39 PM |
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Well I would say a Garret GT28 series or one of the HKS version. But a Factory Garrett GT2830 should do. but personally i would go fro a GT30 Ball bearing sized turbo. I know of one on a 323i BMW goes reall good but uses masive boost up ward of 16psi.
You would really need to get things matched up.
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| TTXR8
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| Posted:Dec 3 2003, 05:47 AM |
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I'm not questioning your ability to suggest turbo sizes Roadhog but i'd recommend using a smaller turbo like a GT25 with a .82 exhaust. The GT25 will easily produce 12psi and won't suffer anywhere near the lag that a GT30 will have, also keep in mind the 91 octane fuel and the highish comp (8.8:1). Just try to keep things realistic and you'll have a well balanced engine/turbo setup.
Hope this helps |
| ITZ-WAR
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| Posted:Dec 5 2003, 02:22 AM |
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| go the GT25 |
| Rodhog
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| Posted:Dec 9 2003, 12:07 AM |
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OH yeah I would go GT25 as well
it's just as I said for me I love maximum boost and big turbo's. but there is notihng liek a perfectly sized turbo on any motor to provide little lag and the right amount of boost
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