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Old 06-21-2002, 12:12 PM   #1
GoodFinder
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Default Which Race Gas for the WRX?

I have different people telling me 96 or 102 or 110 unleaded race gas as the optimum to use in a 2.0L turbo car. But none of them are specifically familiar with the WRX and how it responds to race gas. I'm setting up an alternate Unichip module that will be tuned for race gas. There are several places in the D/FW area that I can get whatever flavor of race gas I desire, then I can take it with me to the track if they don't already sell that version or a close equivalent. And then I've had some people tell me the blend and the density will be even more important than the octane rating of the race gas. Does anybody here have experience using race gas in the WRX where the WRX was properly tuned for that race gas and it's all working out as desired?

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Old 06-21-2002, 12:28 PM   #2
Jon Bogert
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Question

Quote:
the blend and the density will be even more important than the octane rating
Huh? What does blend and density mean?
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Old 06-21-2002, 01:08 PM   #3
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You could theorize, poll various individuals, and take whatever they say as gospel. Or, you could experiment with each variety of fuel that's readily available and see what actually works best for your setup the way you drive. It may be more work, but you'll be a Unichip tuning God by the end of it all, and you'll know for sure instead of just assuming.

$0.02

-Doug
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Old 06-21-2002, 07:03 PM   #4
Subayai WRX
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I know it has been said many times and in many different ways, but what would it be if I didn't try and say,
Quote:
try doing a search through the old threads
Actually, there have been a couple about octance boost, etc.. One of the members used to work for a chemical company (I believe DuPont in Texas). In a nut shell, here was the bottom line. Adding an octane boost does not increase the energy content of the gasoline, only prevents knocking. It would be better to have a mix of premium and racing gas. All racing gas is not worth it.

Now for my own two centavos, I personally mix 2 gallons of TRICK 101 racing fuel, with a tank full of Chevron 91 octane. Now I live in California, so 91 is the max, and we have both summer and winter fuel mixes. On the 91 only, I definitely have a number of stumbles at a number of different RPM's based on the temperature. When I run the mix, the engine runs smoothly upto the rev limiter, with no stumbles. You have to figure that in the rest of the world this car is rated for 95 octance. They obviously have de-tuned the car to handle the 91 minimum requirement. So I would also figure that running 95 would be the best, and peaking at around 98 octane. I don't think there is much benefit past 100 octane, but then no one has shown dyno results from 95 to 100 octane. The higher octane would only help prevent predetonation in very high heat conditions.
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Old 06-21-2002, 07:49 PM   #5
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Yes, of course I did a search before posting this thread.

I'm looking for real feedback from people who have used race gas in their WRX at the track.

All the threads I found were either conjecture or talking about octane additives or boosters and such.

We're going to tune an alternate Unichip module that I'll "hot swap" at the track when I'm running real race gas.

Three sites that I found specific information include the following links:

Chevron Phillips

Sunoco

VP Racing

For the current race gas tuning sessions we're going to do next week, we'll be using the Chevron Phillips B35 100 octane race gas.

If anybody has any real experience running race gas in the WRX, it would be great to hear any feedback, comments, suggestions, observations you can share!

Thanks, GoodFinder
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Old 06-21-2002, 09:11 PM   #6
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Question Re: Which Race Gas for the WRX?

Quote:
Originally posted by GoodFinder
...then I can take it with me to the track...
GoodFinder - Stupid question perhaps, but just so you receive better answers from us...
What type of track are tuning for? 1/4 miler, road course, auto-cross, all of the above?
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Old 06-21-2002, 10:49 PM   #7
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(1) Road course - This is my favorite, and where my WRX and I spend most of our spirited driving time. I'd project this is currently 85% of track time.

(2) 1/4 mile drag strip - Just went for the first time a couple of weeks ago. It was interesting and fun to do, and I'd like to do it at least enough so that I'm respectable. Perhaps this will become 10% of track time.

(3) Autocross - I've only done it as components to professional driving schools. My impression is that I'm somewhere between "not very good" to "mediocre" or "OK" at best, in autocross. I should probably do more of these, but I guess I've gotten "spoiled" with the variety and amount of road course time I've been doing. Maybe this will get up to something like 5% of track time.

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Old 06-22-2002, 01:27 AM   #8
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Not sure why I'm posting as I don't have a WRX. I've been running VP Red 105 octane in our Honda rally car for four years. It works well for us. VP makes C-16 112 octane(I think) for high compression turbo applicatons as well.

My VP dealer(insert disclaimer here) is a drag racer and tells me that guys consistently get better bhp on the dyno with VP than Sunoco. Elf is way expensive and hard to get.

You can either mix the VP 50/50 with the highest pump octane you can find or run it uncut.

Bottom line-try a tank of each and see what you think.

Cheers! John
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Old 06-22-2002, 02:24 AM   #9
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I didn't think that you could run a leaded gasoline in a newer car, as it would build up too many deposits and ruin the engine and destroy the cats, but if this is a track only car, then forget the cats, and as far as the engine, then only you can answer the question what octane.

If memory servers me well, all gasolines above 105 octane (R+M/2) have to be leaded, as that is the only way to increase energy and octane rating. Chemicals such as toulene and xylene can up the octane ante, but cannot be run 100% as they are typically not volitale enough to run in a standard engine, and do not vaporize well at normal temperatures. So if anyone is recommending above 105, I don't think that is reasonible, unless again you have built the engine for the track, and street legal is not a concern.
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Old 06-22-2002, 09:23 AM   #10
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http://www.vpracingfuels.com/

VP has a "Motorsport 103," street legal gas they sell.

From VP's site, "VP RED
A great standard grade of racing fuel. Used in any high compression race engine up to 13:1, off-road racing, marine engines, motocross, karts and personal watercraft. "

"C16
Used in: Turbocharged engines, blown engines and nitrous applications. NHRA Comp Eliminator spec fuel. Recommended by the top nitrous oxide companies.

Color: Blue
Lead: 6 Grams per gallon
Motor Octane: 117
Specific gravity: .730 at 60 F"

Definitely do a search yourself and try the different gas to see what you like. Whatever series you race in may have specific requirements regarding the type of fuel(leaded or unleaded).

Also: http://www.racegas.com/Racegas/default.asp

They have a 104 octane GT plus unleaded.

Please research the unleaded/leaded fuel debate. I know that I was mis-informed when I started shopping for race fuel.

Cheers! John
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Old 06-23-2002, 01:14 PM   #11
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remember leaded gas will kill your O2 sensors
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