Just installed my Brenspeed tune and HOLY #$%^!!!
11-30-2010, 12:08 AM
#21
Banned
Join Date: Mar 2010
Location: missouri
Posts: 502
Potentially... Essentially what happens is the higher octane tunes gets the spark slightly earlier because it takes a little bit longer for the flame to propagate and really build up pressure the cylinder. So if you use a lower octane fuel which burns faster you'll have pressure build up before the piston is at the top of the stroke which puts ridiculous amounts of stress on the lower end. Depending on how severe it is, it can be rather inconsequential or it may result in catastrophic failure. Not something you'd want to play around with for sure.
11-30-2010, 08:23 AM
#22
6th Gear Member
You need to be as close as possible to the octane so you can mix different octanes if needed (i.e. 1/2 tank of 87 + 1/2 tank of 93 = 90 octane). Just don't use octane booster as it screws up these engines. The PCM should be able to adjust for a few tenths of low octane level. Pay attention for pinging.
IMO, once you decide on which tune you like, you won't be changing tunes often. I run my 89 tune about 99.9% of the time so it's a no-brainer remembering to tank up with 89.
Word of caution: If you run a tune higher than 87 octane, carry the tuner in the car. I travel frequently and have had more than 1 occurrence where I could only get 87 octane. I poped the trunk and 3 minutes later I was cruising back down the highway.
IMO, once you decide on which tune you like, you won't be changing tunes often. I run my 89 tune about 99.9% of the time so it's a no-brainer remembering to tank up with 89.
Word of caution: If you run a tune higher than 87 octane, carry the tuner in the car. I travel frequently and have had more than 1 occurrence where I could only get 87 octane. I poped the trunk and 3 minutes later I was cruising back down the highway.
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