Moved to High altitude City and Adv. Mult dropping

[Kronos]

My second week in Boulder Colorado coming from St. Louis. I've had the open flash tablet for about 5 months and have never had my Adv. multiplier drop from 1.00. I'm curious if it has to do with being 8000 ft above sea level and having access to only 91 oct now. i would like to go back to e85 but I'm a bit nervous now seeing this in my logs.

Log starts out with my advance multiplier 0.98
at 1669.16 durring a 3rd gear pull it returns to 1.00
at 1961.11 it drops back to 0.98
then at 2220.72 it drop again to 0.96

Drop in Adv Multi means engine knock, yes?

http://www.datazap.me/u/kronos/color...t?log=0&data=1


I am now at the mercy of the tuning gurus feedback

[Lytheum]

add knock correction and FLKC to your logs and drop vvt intake and exhaust. you will be able to see where knock is occurring. Its probably the 91 octane. If its just bouncing between .96 and 1 and it probably not a big deal.

[steve99]

As above, if you were running 93 before and now your on 91 it will be the fuel, this is normal on 91 and the ecu is just protecting your engine. by reducing ignition advance due poor fuel, there will also be a performance drop. These cars are designed for 93 any less and you going to get iam drop unless its a specific tune for 91

Your car actually has a atmospheric pressure sensor and will compensate for changes in altitude :-)

e85 is a higher octane than 91 or 93 about 105 from memory in your scale, so flash a tune for e85 dose up on corn juice and you will be fine and

[Kronos]

Wow is it really that simple ! Haha I hope so. E85 makes me nervous for some reason.

But it will just provide more protection agains knock? And add some more power because it will allow more timing, yes?

Come to think of it I never really heard of anybody having problems on e85. Not to mention I'm NA. Completely stock actually. I ran e85 once before for a few months and ran good,aside from cold starts. I guess is just a long terms that make me nervous, not knowing how it affects wear and tear on the fuel lines in the engine over the long haul.


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[steve99]

Originally Posted by Kronos

Wow is it really that simple ! Haha I hope so. E85 makes me nervous for some reason.

But it will just provide more protection agains knock? And add some more power because it will allow more timing, yes?

Come to think of it I never really heard of anybody having problems on e85. Not to mention I'm NA. Completely stock actually. I ran e85 once before for a few months and ran good,aside from cold starts. I guess is just a long terms that make me nervous, not knowing how it affects wear and tear on the fuel lines in the engine over the long haul.


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their are few guys on this forum that have 20000 miles plus on e85 hawian and luckrider but truth is is only been about a year since e85 tunes were available so no one knows 100% the long term effect or lack off over five or 10 years.

Use an e85 compatible oil and half the service interval on the oil.

[Kronos]

Thanks for the good info Steve. I've heard of people noticing their oil being darker after a shorter period on e85 than on 91-93. Halving the service interval in a goods tip indeed. Thank you. I didn't know about e85 compatible oil. Do you happen to know any good brands? I plan on googling, just curious if you know any go to e85 oils

[steve99]

Originally Posted by Kronos

Thanks for the good info Steve. I've heard of people noticing their oil being darker after a shorter period on e85 than on 91-93. Halving the service interval in a goods tip indeed. Thank you. I didn't know about e85 compatible oil. Do you happen to know any good brands? I plan on googling, just curious if you know any go to e85 oils

Nulon and penrite do some doubt you get nulon over there though

http://www.penriteoil.com.au/product...d_products=250

http://www.penriteoil.com.au/tech_pd...BLE%20OILS.pdf

[stugray]

Here's a log of my BRZ in the same area (I drive it everyday in Boulder log was in Longmont).

http://datazap.me/u/stugray/za1ja00c...og=0&data=7-41

IAM rock solid at 1, and 91 gas. 100% stock.
OFT stage 1.
Am I looking at the same "IAM" as you?

We tend to knock less here because of the high altitude so 91 oct is fine.

[steve99]

His IAM only dropped to 0.96 , yes he could continue to run 91 no problem.

Tip in knock that causes the IAM to drop in the 2000-3000 rpm area has a lot to do with driving style and how aggressive you are on the throttle at low rpm in a high gear. I can get it to happen on E85 thats 105+ octane if I drive aggressively in that area in high gear.

By the way your pulling about -1.5 degrees FLKC arround 5500 rpm so 91 not all that good

http://datazap.me/u/stugray/za1ja00c...-35-41&solo=35

[w00t692]

Originally Posted by steve99

His IAM only dropped to 0.96 , yes he could continue to run 91 no problem.

Tip in knock that causes the IAM to drop in the 2000-3000 rpm area has a lot to do with driving style and how aggressive you are on the throttle at low rpm in a high gear. I can get it to happen on E85 thats 105+ octane if I drive aggressively in that area in high gear.

By the way your pulling about -1.5 degrees FLKC arround 5500 rpm so 91 not all that good

http://datazap.me/u/stugray/za1ja00c...-35-41&solo=35

e85 is about 94 octane in actual practice. The reason it makes such good power is it cools the combustion process drastically due to the need for more fuel to run the same afr as regular pump gas.

Also to note, whatever afr max power is on pump gas, go ahead and run about half a point less on e85 to pick up some extra horsepower.

Max power on pump gas in my civic is 13:1. On e85 it's 12.5:1

[steve99]

Originally Posted by w00t692

e85 is about 94 octane in actual practice. The reason it makes such good power is it cools the combustion process drastically due to the need for more fuel to run the same afr as regular pump gas.

Also to note, whatever afr max power is on pump gas, go ahead and run about half a point less on e85 to pick up some extra horsepower.

Max power on pump gas in my civic is 13:1. On e85 it's 12.5:1

agree, allows you to run more timing advance
The E85 we get here is rated 105 RON, yours probably rated MON

[stugray]

Originally Posted by steve99

By the way your pulling about -1.5 degrees FLKC arround 5500 rpm so 91 not all that good
http://datazap.me/u/stugray/za1ja00c...-35-41&solo=35

So is it true that I did not have any knocking in this log since it was using FLKC and the IAM didnt drop?

Still trying to learn how to read the logs.

[steve99]

Originally Posted by stugray

So is it true that I did not have any knocking in this log since it was using FLKC and the IAM didnt drop?

Still trying to learn how to read the logs.

If you have a read of the Knock fix for Australian fuels thread first post it should explain it.

IAM does not always drop on knock events, IAM is the ecu,s last line of defence it will only drop on repeated knock events over a certian threshold in a certian period of time.

So you can have a certian amount of flkc and fbkc without iam drop

in that log you have flkc of up to 1.3 in places.

[w00t692]

Originally Posted by steve99

agree, allows you to run more timing advance
The E85 we get here is rated 105 RON, yours probably rated MON

negative it was R+M/2 like all US gas is rated on the AKI scale.

But it is actually more like 94-95 octane apparently. Doesn't perform like that in practice though.