# E85 content analyzer?

**URL:** https://forums.speedlife.net/t/e85-content-analyzer/258358
**Category:** Shift518 Automotive
**Created:** [May 11, 2011, 6:18pm UTC](https://forums.speedlife.net/t/e85-content-analyzer/258358 "2011-05-11T18:18:49Z")
**Posts on this page:** 1
**Showing post:** 11

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### Author: ![TurboTravis](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/turbotravis/32/6406_2.png) [@TurboTravis](https://forums.speedlife.net/u/TurboTravis)
#### Post date: [May 12, 2011, 3:21am UTC](https://forums.speedlife.net/t/e85-content-analyzer/258358/11 "2011-05-12T03:21:23Z")

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> [@Apple leaves older Mac Pro users in the dust](https://forums.speedlife.net/t/apple-leaves-older-mac-pro-users-in-the-dust/42076/6):
>
> Thank you guys. I’m not seeing any knock and I’m not really thinking I have an issue…just don’t want bet my motor on it. Most other GTR’s I know running E85 are doing exactly what you suggested (tuning around E77 and letting the trims keep everything safe). Still, knowing that mine was originally tuned on E70, I want to do some data-logging to get a tweak if needed.
> 
> So now that you’ve found your cars do a good job correcting for the seasonal variations in ethanol content…is there any practical reason to have a Zeitronix in-car?
> 
> Not sure what the AFR target is on my current tune.
> 
> On my current setup, I gained 195 HP & 210 TQ from stock.

phone post so bear with me…unless your car is running closed loop at wide open throttle, it’s not correcting for ethanol content changes. With that said, knowing your ethanol content at all times is manditory. Just keep in mind that the little shake testers run a few percent high. People have seen as low as e50 and as high as e90 on The zetironix

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