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Tuning / Diagnostics -- engine and transmission Tune and diagnostics for engines and auto transmission.

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Old 08-22-2012, 01:07 PM   #1
monstertodd


 
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Tuned for 91, moved to 93.....Should I retune?

Hey all, I recently moved from California to South Carolina and can now legally buy 93 octane fuel. I have a Lysholm 2.3 blower installed, and the car is tuned with the canned tune that came with the blower.....for 91 octane.

Am I going to have to retune for 93 octane?

Thanks.
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Old 08-22-2012, 01:19 PM   #2
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I think you will be fine.. I'm sure your going to get all kinds of answers.. Good luck!!!
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Old 08-22-2012, 03:30 PM   #3
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I think you are safe without a doubt, but you would be much happier with a custom tune for 93.If you have the SCT flasher you could call Ted at JRE or you could buy one if not.
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Old 08-22-2012, 06:23 PM   #4
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well of course you are safe, just leaving some power on the table....
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Old 08-22-2012, 07:20 PM   #5
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You don't NEED to re-tune, but since you are still on the canned tune for 91 there is certainly some room for improvement.

Unless you are done modding the engine, if it were me I would wait until my next upgrade then put it on the rollers.

You should head up to Cars and Coffee in Charlotte next Saturday if the weather permits.
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Old 08-22-2012, 07:52 PM   #6
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first off, congrats for escaping CA one more reason to love the south

there ain't no reason to retune it right now because you can always throw extra octane at an engine. shoot... you can run C16 if you want. it's the same principle as putting 93 in a malibu: you won't really gain anything, but if you put 87 in your car, there's gonna be problems. the higher octane rating gives the fuel properties that allow you to run more timing without detonation (knocking). this is more important in high-compression & forced-induction engines because of the increased cylinder temps & pressures.

tuning for 93 octane would allow you to advance the timing another couple degrees & pull a little more power out of your engine. the downfall to doing that is that if you're like me & get moved to a town that only sells 91 (i eventually found the 1 station here with 93), it gets a slight bit more risky running lower octane fuel when you go WOT because you run a higher risk of getting knock, which over time can ruin an engine. you can mitigate this a couple ways: drive more conservatively, mix some race gas into your tank, or don't add timing. that said, 93 is everywhere in that part of the country, so you'll be fine.

my suggestion, though (in line with some others above), is that you wait til you do some more mods before you retune (like headers & maybe a cam). you wouldn't believe the difference they will make!
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Old 08-22-2012, 11:45 PM   #7
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Thanks for all the responses everyone.

I do have some mods in the works. My car's going to the body shop on the 27th to repair some shipping damage, but after that I'm heading down to Heinz performance and having a ZL1 fuel pump installed, DSS 1000 hp axles installed, diff/subframe bushings installed, as well as a full dyno tune. Hopefully headers/cam will came at some point too.

What's the skinny on cars and coffee up in Charlotte?

*edit, I just found the cars and coffee website. Looks like it's postponed until September 8th because of the democratic national convention.
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