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Old 02-01-2010, 10:46 AM   #1
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Question re-tuning

thinking about tuning my car for 93 octane. atm its tuned for 91 octane which isnt even around here, so ive been using 93 anyways. will there be a difference if i tune it to 93 and use 93, over using 93 while its tuned for 91?
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Old 02-01-2010, 10:58 AM   #2
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Re: re-tuning

There will be very minimal difference. having it tuned for 91 allows a little room for getting bad gas. I am currently on a "91" tune that I use for traveling as well as for when I fill up with anything other than chevron. It just gives me a little room for error on the quality of gas.
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Old 02-01-2010, 11:04 AM   #3
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Re: re-tuning

now what about running 89 with 91?
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Old 02-01-2010, 11:07 AM   #4
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Re: re-tuning

Not a good idea. If your tune is setup for timing for 91 octane, running 89 is not providing enough octane to support it. You "may" be able to get away with it if the 91 tune is just a general canned tune, but if the 91 tune is truly setup for 91 octane, running 89 is a bad idea and will probably lead to detonation.
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Old 02-01-2010, 11:12 AM   #5
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Re: re-tuning

i feel like its a canned tune(going to fix that...). i might want my car tuned for 89, buying 93 all the time is expensive, but id still be able to use 93 with my car tuned for 89?
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Old 02-01-2010, 11:20 AM   #6
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Re: re-tuning

also the guy that helps me out with my tuning etc.. thinks its stupid to work on a V6. im younger and inexperienced. how do i go about getting him to give me a tune thats not canned? this will def sound stupid but, is it called anything, manually tuning? ugh im a noob
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Old 02-01-2010, 11:24 AM   #7
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Re: re-tuning

I don't know much about tuning but don't listen to the part about workin on a v6 being stupid. Its not his car just tell him to shut the f*** up.
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Old 02-01-2010, 11:35 AM   #8
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Re: re-tuning

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Originally Posted by blackonblack View Post
i feel like its a canned tune(going to fix that...). i might want my car tuned for 89, buying 93 all the time is expensive, but id still be able to use 93 with my car tuned for 89?
If your car is tuned for 89, there is zero to be gained by running 93...other than the slightly extra weight removed from your wallet for paying 10 cents more per gallon.

You run what your car is tuned for. going higher serves no purpose what so ever.
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Old 02-01-2010, 11:40 AM   #9
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Re: re-tuning

wowww. so technically i havnt even experience my tune yet because i havnt used 91 octane. holy ****balls im mad.
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Old 02-01-2010, 11:43 AM   #10
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Re: re-tuning

holy ****balls is right lol
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Old 02-01-2010, 11:45 AM   #11
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Re: re-tuning

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wowww. so technically i havnt even experience my tune yet because i havnt used 91 octane. holy ****balls im mad.
If you've been running 93 on a tune for 91, you've experienced your tune. It's just that running 93 gained nothing at all. The car will perform the same whether you have 91 or 93 in it. Now, if you were to run 89 like you asked earlier, you would experience your tune as well....with the addition of detonation.
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Old 02-01-2010, 12:18 PM   #12
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Re: re-tuning

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Originally Posted by blackonblack View Post
also the guy that helps me out with my tuning etc.. thinks its stupid to work on a V6. im younger and inexperienced. how do i go about getting him to give me a tune thats not canned? this will def sound stupid but, is it called anything, manually tuning? ugh im a noob
If the guy doing your tuning is telling you that it's stupid to work on a v6, I'd go elsewhere...an opinion like that might affect the outcome of your tune.

You could do a dyno tune. That's more like a custom tune. It might seem pointless since your car isn't heavily modded and a/f ratios aren't a huge concern, but it might get your car straightened out and you'll get the tune you want with the fuel you want.
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Old 02-01-2010, 12:21 PM   #13
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Re: re-tuning

alright. car was def. dyno tuned. and i think ive got everything figured out. thanks
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Old 02-01-2010, 01:32 PM   #14
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Re: re-tuning

if you do have to buy lower octane gas... then just dont drive the car at wide open throttle, take it easy on it and it will be ok.
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Old 02-01-2010, 05:39 PM   #15
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Re: re-tuning

The octane rating doesn't really have anything to do with "power" gained or lost. It has everything to do with your engine's timing and preventing detonation, as Venom said. Running higher octane than required won't hurt anything other than you spending more money needlessly. Running octane that's too low is asking for big trouble.
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