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

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Old 08-12-2012, 05:46 AM   #1
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Fuel x Tune question

What happens if I changed the fuel I tuned for ?..

i.e if I was on a road trip and I only had the option of going to a lower fuel grade ?


Thanks !
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Old 08-12-2012, 10:12 AM   #2
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Are you Tuned for 93 and thinking you may have to put 91 in? Are you NA or FI?


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Old 08-12-2012, 10:22 AM   #3
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If you don't beat the car you will be fine. I could fill my car with 87 and cruise it around town if I really wanted to.
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Old 08-12-2012, 01:21 PM   #4
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yep just don't apply too much cylinder pressure. as long as your timing is not too high at part throttle.
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Old 08-13-2012, 03:23 AM   #5
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Just to be safe you may want to pull your fuses whenever you get back home and you are able to use the octane fuel you usually do. Just in case it messes with the LTFTs. I wouldn't think it would after just a tank or two if you have had the car for awhile. But better safe than sorry.
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Old 08-13-2012, 05:45 AM   #6
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Quote:
Originally Posted by Crime2 View Post
Are you Tuned for 93 and thinking you may have to put 91 in? Are you NA or FI?


Sent from my iPhone using Tapatalk. If is spelllled wrong deal with it.

exactly .. tuned for 93 and will have to top up 91 if i wanted to to this road trip thing because not all stations will have 93 !

The car is NA !
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Last edited by Bu3ali; 08-13-2012 at 06:17 AM.
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Old 08-13-2012, 05:45 AM   #7
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Quote:
Originally Posted by Supercharged SS View Post
If you don't beat the car you will be fine. I could fill my car with 87 and cruise it around town if I really wanted to.
As in no full throttle ? or not high speed ?
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Old 08-13-2012, 05:47 AM   #8
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Quote:
Originally Posted by LVDran View Post
Just to be safe you may want to pull your fuses whenever you get back home and you are able to use the octane fuel you usually do. Just in case it messes with the LTFTs. I wouldn't think it would after just a tank or two if you have had the car for awhile. But better safe than sorry.
Yeah .. I dont want to risk it .. but if there is a possible safe way to do it then why not !
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Old 08-13-2012, 09:01 AM   #9
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Quote:
Originally Posted by Supercharged SS View Post
If you don't beat the car you will be fine. I could fill my car with 87 and cruise it around town if I really wanted to.
Exactly....

However if you do get enough knock sensed, and your calibrator left your low octane table stock, you could drive the car on good fuel with less then optimal spark.

May have the reset ECM or drive it a bit to relearn back to the HO table.

Howard
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