07-09-2018, 07:00 PM | #1 |
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Continual bad fuel and octane struggles
I am really beginning to think fuel is my enemy. I seen to always get fuel...even at Shell that cannot keep consistent timing at 93 oct. I went to the mtns Sunday and had to fill up right when I got back to the highway .... looked around and found a large Exxon station. No Shell nearby
I did some highway pulls afterwards since my IAT's were down around 103, ambient was I think 79 give or take. The logs were crap..... major timing pull, knock recorded, time sometimes went from 9.5 to 4 on some cylinders. It got boost up to the mid 16's and the load was between 94-99 but timing was all over the place Might be time to use the additive again or map down to Stg 1 93 or stg 2 91 http://www.bootmod3.net/log?id=5b425d8cd10b43793494a2fa http://www.bootmod3.net/log?id=5b426002d10b43793494a2fd http://www.bootmod3.net/log?id=5b42606bd10b43793494a2fe http://www.bootmod3.net/log?id=5b426110d10b43793494a2ff |
07-09-2018, 09:05 PM | #2 |
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It's not necessarily really the bad gas. Especially if you're doing great on cool days.
If you open timing table from stock map, you'd be surprised how little timing retards there is to IAT increase. In reality, cylinder ignition time (and thus ignition timing) is much more sensitive to IAT. BMW does that to have cars make consistent power under all circumstances. And the premise of that is to not approach timing limit with cool IAT. Therefore, on hot days when DME demands higher boost to offset thinner hot intake air, timing loss would be minimal. So you have the power consistency. Most of the aftermarket companies tune cars to low or normal temperature. They wouldn't sell tune coming back from 100F track day and telling you sorry there is only so much more power we can reliably make over stock. No one appreciates that. From my observation, they would make sure your car is holding up great at below 80F with correct octane and doing just fine at 100~110F. Above that, relax a little bit. That's normal and is what happens when you have a map that approaches octane limit to make power on cool days (who doesn't like that) and doesn't retard enough timing to high IAT. BTW, the day before I saw 410whp+ with Dinan turbo on pump gas last year, Dzenan specifically asked me to keep IAT below 80F. So I did. The dramatic change of timing table would be too many risks and not rewarding at all (sales and customer feedback). People thank tuner only for making big dyno number and driving smoothly on street, not for backing off on power. In addition, absolutely no one with sanity tracks his or her car with the aftermarket tune that makes maximum power on the dyno sheet. My point is if you want to stay on STG2 93OCT, you either keep IAT under 110F (Pure Inlet will help) or be easy on hot days. Or log STG2 91OCT and report back. Be easy for a moment, think what happens with piggybacks on hot days LOL
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Last edited by SeanWRT; 07-10-2018 at 10:44 AM.. |
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07-10-2018, 03:28 AM | #4 |
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I might try lower oct map till the new IC gets here, I really didn't want to resort back to the orange glow. Am I correct to assume that difference between stg 1 & 2 is mostly boost and between 91 & 93 is timing? If I can get out this morning it should be cooler I will pull a few more on the current STG 2 93 for shits n giggles
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07-10-2018, 04:42 AM | #5 | |
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If FMIC is stock in summer time and stage 2 - your logs sort of endorse PTF recommendation ie stg 2 needs FMIC upgrade
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07-10-2018, 06:59 AM | #6 | ||
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07-10-2018, 07:55 AM | #7 |
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07-10-2018, 09:07 AM | #9 |
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Good to see some brand loyalty !
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07-11-2018, 06:55 PM | #10 |
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Well we were to have a cooler morning for a change so decided to go do some pulls on the same gas. Ambient was 72. All IAT's started a good bit below 100 and the max i see at the end of a 3 gear long pull is 122......
I was thinking of trying the stg 2 91 to combat the timing pull but going to play with the E30 and log again http://www.bootmod3.net/log?id=5b447e1cd10b437911b1c9f8 http://www.bootmod3.net/log?id=5b447e37d10b437911b1c9fa http://www.bootmod3.net/log?id=5b447e69d10b437911b1c9fb http://www.bootmod3.net/log?id=5b447ea2d10b437911b1c9fd |
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