^^^That stuff is GREAT, but for me at least, the cost as compared to even driving the 50 miles EACH way to the nearest E85 station would be either a wash, or LESS than that additive's cost!
So I have some thoughts on this, below....
Working on my race-gas concentrate tune, here are a few observations:
1. MPG first 100 miles is identical to 93 octane.
2. On 3rd tune revision currently, vDyno below says I'm up 14hp and 10ft/lbs. The car definitely feels like it's up 14hp. Remember it's only vDyno which I've proven to be very unreliable. But, it's a baseline...
3. My tuner Tune+ says that the RG concentrate yields similar results to an e30 tune.
4. Cost really isn't outrageous...I did the math, it would be about $540/year for me to keep this in my tank full time. That's $45 a month. I can think of less worthy things I spent that amount on each month.
5. My mix here equates to about 98.5 octane and I will say in addition to the power bump, which is really obvious throughout the entire rev range especially over 5,000rpms, the car runs noticeably smoother.
6. Boost is NOT increased at all as we're keeping me at the Pumaspeed-recommended 25.4 for the X47.
7. I'm learning to read logs more and more...my RG tune has 4 degrees more timing than my 93 tune at 4,500-6,000rpms. That is pretty beastly. No negative corrections.
Now - some reasoning on power beyond X47 (aside from different turbo)....three basic options for me as I see it are (1) methanol injection (2) e30 tune (3) race-gas concentrate tune.
METHANOL INJECTION would bring the most power (from what I've read) and keep the engine cleaner. For me there's about a $1000 start-up cost to do it right for the kit I want (kit, meth, hard charge pipes, misc.). Plus there's the install, plus the hassle of having a meth tank in the car, and not being able to use my trunk storage as freely. So meth is out for me.
ETHANOL 30 blend would be my choice but it is not an option with no stations anywhere near me. However I'm OK with that because the downsides of ethanol are (a) lower MPG (b) hassle of mixing (c) unavailability of ethanol on a trip.
RACE GAS according to my tuner yields near identical results as e30. The disadvantage is the cost, as e30 is relatively free. But the advantages are (a) super easy to mix (b) no installation needed. 2 years of racegas will cost about the same as a full meth kit. And, on trips where I'll be mostly driving on the highway, I can run my regular 93 tune and skip the race-gas for a few tanks, and save some money.
After talking with my tuner and the good folks at race-gas (I called and we chatted for a few minutes), I've learned that the only drawback of this product (they ran it full time in a bunch of cars for 3 years) is that spark plugs might need to be changed more often. That and orange smoke on the tailpipes.
In the end, for a 10-20hp bump this is a really great product for me. If it's more than that in the end I'll take it!
*****
Anyhow that's what's in my brain this morning after a drive. The car is really running great!!!
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