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Tracking / Autocross / HPDE / Drifting What these cars were built for!


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Old 02-13-2021, 03:58 PM   #1
gshopper
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JRSC and octane at the track

(this is crossposted to the forced induction forum, so sorry about the redundancy)

I have a 2019 BRZ which has been the track a few times (JR oil cooler, camber bolts, brakes and tires...otherwise stock). While I love the way the car handles, I wish it had a few more horsepower; I think around 250 would probably be the sweet spot for me. I don't need to be the fastest, but there are a lot of fast cars in my group, and it would be good to keep up with the pack. I do mostly HPDE's and a few days of open track. No racing, but I usually drive in the advanced groups.

I am thinking of getting a Jackson Racing supercharger. The instructions "REQUIRE a minimum of 50% 100 octane fuel" at the track. 75 to 100% 100 octane is recommended.

Some of the tracks I would be going to may not have 100 octane. Also, while I recognize that going to the track is not cheap, when I can get it, it is over three times the price of 93 octane.

Can a JRSC run 93 a the track? I don't need crazy horsepower, and I would be happy to sacrifice some power for a 93 octane track tune, if one exists.

What is everybody doing?

Thanks.

Glenn
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Old 02-13-2021, 04:24 PM   #2
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Do you still have your catalytic converters? If not, one option is to use Boostane to cost effectively raise your octane to 100 at the track.

Alternatively, buy some gas cans and purchase your 100octane before going to the track and take your track fuel with you.
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Old 02-13-2021, 04:26 PM   #3
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Still got the cats... but

"Jackson Racing supercharger systems require Premium grade (91 Octane or greater) gasoline, as does a stock FR-S/86/BRZ. Fuel quality is very important with a high performance application, so remember to only use a “Top Tier” gasoline. Do NOT use Octane Boosters in your fuel system. Octane Boosters will damage your spark plugs and your oxygen sensors when mixed incorrectly."

quote from JR installation manual
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Old 02-13-2021, 04:32 PM   #4
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E85?

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Old 02-13-2021, 06:53 PM   #5
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e85? Not really interested. Can’t get it where I am.
Need to focus on 93 octane gas.
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Old 02-15-2021, 01:38 PM   #6
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I have never ran more than 93 with the 12-10psi pulley, and have not had any knock issues. the base pulley should be even safer.
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Old 02-15-2021, 04:13 PM   #7
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ML,
Is that for the street or track?

My car is my daily, but it would see track duty a few times a year.
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Old 02-15-2021, 04:48 PM   #8
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Get a custom tune from a reputable shop and tell them to build you a conservative tune for track use
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Old 02-15-2021, 06:08 PM   #9
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ML,
Is that for the street or track?

My car is my daily, but it would see track duty a few times a year.
Track use only, but like ninjanoodles said you should get a good tune to be safe.
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Old 02-15-2021, 06:48 PM   #10
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The higher octane is safety margin. If you choose to roll the dice, you can do so, and many do successfully, but in the case of an engine failure due to knock/detonation, know that higher octane could have prevented that.

Race fuel, Race pads, Race maintence, makes sense, for a car being driven at a Race track.
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Old 02-15-2021, 07:03 PM   #11
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The easiest way to tell is to datalog at the track and see how much knock you're getting on 93, and figure out how much knock you're comfortable with.
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Old 02-15-2021, 08:28 PM   #12
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I'm not comfortable with any knock at all!

Remember, track driving will load the intercooler far more than street driving, which means higher intake temps, which means higher risk of knock/predet. Higher octane fuel means higher knock resistance.

It has nothing to do with the tune, and everything to do with the driving conditions.
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