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Supporting Mods/Tune for 3.4L -> 3.8L ??

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YOUR RESEARCHSupporting Mods/Tune for 3.4L -> 3.8L ??

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Run with the factory tune and equipment

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Suggestion · Original poster

With the increase in displacement, will there be any issues with the car running with the factory tune and equipment?

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Supporting Mods/Tune for 3.4L -> 3.8L ??
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Leading evidence: 'Run with the factory tune and equipment' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Run with the factory tune and equipment' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.

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Run with the factory tune and equipment

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Suggestion · Original poster

With the increase in displacement, will there be any issues with the car running with the factory tune and equipment?

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Supporting Mods/Tune for 3.4L -> 3.8L ??
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2 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.

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POST 1 / ORIGINAL POSTEROriginal post

Are there any supporting mods/upgrades that should be considered when going from a 3.4 to a 3.8? Our 996.1 block is currently at LN engineering for new Nikasil liners and the 3.4-3.8 upgrade. With the increase in displacement, will there be any issues with the car running with the factory tune and equipment? I've read conflicting things online about sometimes a 3.8 car runs lean but I wanted to get a definitive answer. Is it recommended to get a tune or a larger throttle body to compensate for the increase in displacement? Thanks

POST 2Original post

My 3.8 was optimized on a chassis dyno . The stock ECM will do some learning on its own but that learning is somewhat limited . In my last job I witnessed over 180 Porsche engines go across the chassis dyno . Not one had great air/fuel ratios out of the box . External electronic tuning got them all dead nuts perfect . If you can find a good tuner shop it is well worth the $$$ . Knowing the AFR is perfect across the board is priceless , especially on a big dollar build .

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