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BMW 3-Series (E90 E92) Forum
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Mike/Terry, can you please join this discussion?
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02-21-2011, 05:01 PM | #530 |
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02-21-2011, 05:03 PM | #531 |
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So when does the ECU lower the timing curve to a maximum of 10 BTDC? Is it when the Map sensor senses boost? Is it at a certain pedal value? Also, do the BMW ECU timing tables include manifold pressure as well? Or is it just a max depending on RPM ramping alongside the knock sensor feedback?
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02-21-2011, 05:03 PM | #532 | |
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3. outside ambient air temp 4. air density and humidity 5. coolant temp 6. road condition -- incline/decline >> which translates into load --as load increases so does the propensity for the engine to knock. and plenty of other factors are to be added to the equation. i understand that this more of conversation regarding a tunes lack of timing controls, but counterpoint issue "how, when, serverity, effects are all related to the variables. i know where you are going with this issue, and believe me i fully understand your passion -- but others that are not as familiar with engine dynamics will be lost -- totally |
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02-21-2011, 05:05 PM | #533 |
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It has a maximum boost pressure of 1.5 bar (21 psi) and direct High Precision Injection.
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335xi Sedan 6AT | Weather(70-85°F) | N54 Tune Comparison Chart || N54 Turbo Upgrade Comparison Chart
-PROcede Rev. 2.5 ~ v5 (3/17 maps) / JB4 (8/21 maps) / COBB (Stg2+FMIC LT Aggressive maps) †Procede Map2(UT 45 - IGN 40) Aggression Target 2.0 | 0-60 in 4.0sec || †Cobb E30 LT (35% Ethanol/65% 93 Octane) | 0-60 in 3.9sec AR Design Catless DP | BMS DCI + OCC | ETS 5 FMIC | Alpina B3 Trans Flash |235/265 19" Michelin PSS |
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02-21-2011, 05:05 PM | #534 | |
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02-21-2011, 05:06 PM | #535 |
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with a v8 and 9.3 compression ratio....Boost pressure doesnt really mean much, 21psi from a tdo3 and 21 psi from a gt42r is still 21psi, but not the same amount of air or pressure in the cylinder.
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02-21-2011, 05:07 PM | #536 | |
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They are not using different ways to do the same thing.....jeez man. The knock sensor and resulting timing drop off is a safety mechanism. BMW has selected the maximum set timing points for each car based on an amount that they believe creates the optimum balance between performance/safety. I will capitalize this point for you so that it is as clear as possible THE 335is HAS A LOWER SET TIMING MAXIMUM BECAUSE BMW BELEIVES THAT DECREASING THE SET TIMING MAXIMUM ON A CAR WHICH HAS HIGHER BOOST WILL BRING THEM TO AN IDEAL RATIO OF PERFORMANCE/SAFETY. The only thing that is the same is that they both have a proactive knock sensor which will drop timing if necessary. The timing on the higher boosted car is DECREASED IN ORDER TO LIMIT THE AMOUNT OF TIMES THAT THE SENSOR IS ACTIVATED AND THE CAR HAS TO DROP TIMING Good lord man....... |
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02-21-2011, 05:09 PM | #537 | |
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personally when I custom tune my car I do it up a little incline, to slow the rpm rate and fill each cylinder more, aka load up the engine. But this isnt really relevant to the whole, rely on the knock sensor to save your ass discussion. |
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02-21-2011, 05:10 PM | #538 |
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Why is this whole point so difficult to understand, I ran a jb3 from august 2008 to november 2010 and while it was powerful it was completely inconsistent boost surges, back fires on dynos, ran like a bat out of hell in the cold then the heat came and it rode rough and crappy..Terry is great guy very nice and honestly very patient but when it comes down to it ignition control is a fundamental in tuning and the jb products don't have it, others do...period those pre-knock events may not seem to be a big deal now but years of wear will prove other wise, basically before anyone argues for the jb product line just look at the facts, that's all you need to do it was all I needed to do to see reality. And before anyone comments on my car not blowing up I barely drive 5-7000 miles a year.
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02-21-2011, 05:11 PM | #539 | |
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02-21-2011, 05:14 PM | #540 | |
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02-21-2011, 05:15 PM | #541 | |
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but since i work on the other side of this issue, im try to get people to least aquainted with some basics before i get to see the result |
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02-21-2011, 05:18 PM | #542 | |
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Its my day off work with presidents day today, too much time reading this nonsense |
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02-21-2011, 05:27 PM | #543 | |
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02-21-2011, 05:35 PM | #546 | |
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If you raise boost you need to alter base timing and rely on the knock sensor to save you incase of harsh conditions. This is how BMW does it on the IS model, this is however EVERY main tune does it except the juicebox. If the juicebox way was the way to do it, why didnt bmw just raise boost on the IS models and let the knock sensor figure it out? |
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02-21-2011, 05:40 PM | #547 | |
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02-21-2011, 05:42 PM | #548 | |
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02-21-2011, 05:44 PM | #550 |
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Can someone please post these programming details up highlighting the 3 degree timing retard at the same load calculation.
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