E30 = BIG HP Gains!

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Old Feb 2, 2026 | 12:55 PM
  #26  
dspecialistb's Avatar
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From: Rocklin, CA
'14 CLS550 , '86 420SEL
i've filled up a handful of times and adding a 1-3gal of E85 in mine. The car is responsive for sure, but also sounds louder than with with only 91.
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Old Feb 3, 2026 | 10:25 PM
  #27  
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From: Phoenix, AZ
2014 CLS550 4MATIC M157 swap, MBH Tuned
Originally Posted by dspecialistb
i've filled up a handful of times and adding a 1-3gal of E85 in mine. The car is responsive for sure, but also sounds louder than with with only 91.
Running more ethanol gives more powerful explosion in the cylinder head and you do hear that louder exhaust note now.
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Old Feb 3, 2026 | 10:36 PM
  #28  
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From: Phoenix, AZ
2014 CLS550 4MATIC M157 swap, MBH Tuned
Originally Posted by JQmile
Soooo, got some confirmation last night that I'm not crazy!! Haha. Most of the time I trap 111mph during quarter passes, but I did trap 112mph once in hero DA. This time I was in hero DA again, but now I was on E25 and, 115mph! woohoo! I had to pedal it until middle of 3rd too thanks to less than awesome roads, but picking up 3-4mph of trap in the quarter is definitely showing a good bump in horsepower. Calculators right now put the car at about 470rwhp! I'm going to dilute the fuel back down to about E15, but I'm more than happy with the results. Car is on an OE Tuning 91 Octane tune, and is completely stock, including downpipes and air filters.
DAMN! Thats great numbers for our tanker ships. Awesome pick up on that trap speed!

Gonna get retuned in a few months for prob E40 and just addc6 Oz of Lucas Safeguard only needing 4 for 20 gals but the little extra wont hurt performance. Also to keep the HPFP and LPFP and lines coated.

Every 5k will run Hot Shot's Secret Engine additive with LX4. For heavy duty cleaning with the XL4 coating the high friction points. I was told by Dyno-Comp that will keep me safe. Just the extra crap to run higher ethanol is it worth it having to carry a science lab in the trunk every time I need to fuel up
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