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I want to ask all the So Cal folks that are tuned how their cars are running with a tune, because it's well known we get pretty bad quality fuel out here. Just wondering before I pull the trigger on a stratified tune.
(Noob to tuning)
 

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"bad quality fuel" it really isn't all that awful... the tuners can/will account for it in their tunes so they might be a less aggressive but you will never know the difference ;D
Just stick to the big names, Chevron, 78, Shell. My car only fills up on Chevron and hasn't touched anything else. Thinking about trying some Costco 91 as I'm a huge fan of everything costco but that's for another day.
 

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My car has been tuned on e40 blend and I've never had any issues!
 

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Oh it's bad... My car is stock except for E40 tune but I am going to turn back to using my water injection system as that's the best solution of all.

91 octane is for cruising around and doing Uber on, not for on-track running, I'm not giving away 12-15 hp like that.
 

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Have 1600 miles on mine with the stratified 91 tune
 

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I run 91 octane for commuting and VP100 at the pump for hot hatch driving. I have tunes for both stage 1 and stage 2. Car runs 100% better on VP100 or a mix of 25% VP U4.4 and 91 octane. ACG Motorsports in SD specializes in VP MS109 tuning and all their shop cars run it and can really put a spring a cars' steps. Tuners for pump gas take into account the 10% ethanol in pur crappy gas.


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For anyone wondering, I would put Costco gas in a "below top-tier" quality (former employee, and it used to be Sinclair fuel with a "modified detergents package" if I remember correctly). Stay away from Arco and similar brands. Been tuned for quite a long time and even at $.10/gal delta, it's about a dollar extra to put good gas in and that makes it easy to justify IMHO.
 

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I run 91 octane for commuting and VP100 at the pump for hot hatch driving. I have tunes for both stage 1 and stage 2. Car runs 100% better on VP100 or a mix of 25% VP U4.4 and 91 octane. ACG Motorsports in SD specializes in VP MS109 tuning and all their shop cars run it and can really put a spring a cars' steps. Tuners for pump gas take into account the 10% ethanol in pur crappy gas.


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I agree that VP MS109 is the best pure gasoline fuel out there. But at $74 for 5 gallon drum, water injection is more economical and will provide the same results if not better especially in hot weather.

You can even add a dash of nitro-methane to your 50/50 mix for some extra "pop".

For anyone wondering, I would put Costco gas in a "below top-tier" quality (former employee, and it used to be Sinclair fuel with a "modified detergents package" if I remember correctly). Stay away from Arco and similar brands. Been tuned for quite a long time and even at $.10/gal delta, it's about a dollar extra to put good gas in and that makes it easy to justify IMHO.
I've run Arco, not all gas is equal but getting power out of 91 is an exercise in futility.

I will be talking more about my water-methanol system in the coming weeks; even running 100% water is an improvement over straight 91.
 
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