i have some questions for the e30 gurus. i have the seta engine, are the pistons in my engine higher comp. than a regular eta? if this is true then the eta to i head swap should make good power. or more than the regular eta anyway, right. i have read on here the seta may respond better to this mod than the normal eta. is this true? i understand that the seta has the same head casting as the i but different internals so it is not safe to rev as high. let me know if im off base
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nope.
you already have an "i" head, it just has the eta cam and single valve springs. your compression ratio is 8.5:1. the easiest upgrade would be i cam, double valve springs, and the intake/electronics from the i. the bottom end will rev just fine, it's the eta cam and intake that are no good above ~5300rpm. -
yea my desired upgrade path is to get an i head and budget permitting mabey put a 272/284 cam 19lb injectors, the best IM&TB combo i can find and get mark d to write me a chip all at once. then long tube headers and full cat delete exhaustComment
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just get all the i stuff - you can put that cam in your head (make sure all 7 cam bearings are drilled, some seta heads only have 4 of them). you'll want double valve springs and new rockers too. I don't think you even have to switch harnesses, you might just need a 173 ECU - the sensors should all be the same, except for the AFM. you'll want high impedance injectors for the 173 ecu (basically any ford 19# being sold out there).Comment
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