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BMW 3-Series (E90 E92) Forum
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MHD "take a look at my log" thread
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01-23-2022, 08:07 PM | #5237 | |
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Fuel trims also look a bit alarming, you are running pretty rich. Could potentially be biased O2s? Somebody else might have to chime in there because I have not dealt with that personally, mine just outright failed on me
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01-24-2022, 12:41 AM | #5238 | |
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i have over 150 1/4 mile time slips on stock turbos and i have tried shifting from 5000-7000 and i get the best times shifting around 5000-5300 over and over again. I would trust real world results over some math. STOCK TURBOS ONLY. The boost tapers hard up top. I launch from 2nd and you can go to 5500rpm in 2nd but for 100-200 runs its best to shift early.
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01-24-2022, 01:57 AM | #5239 | |
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01-24-2022, 10:39 AM | #5240 |
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This is what I'm thinking too, especially if you are on a high boost mid-range map, then it would actually be beneficial to shift that early. But on OTS maps you are leaving probably leaving time on the table. It may be a good idea to shift a bit earlier than I said in 1st and 2nd because load will be higher in higher gears meaning higher boost and higher torque, but I think 5000-5300 is too early. That's probably about where peak power is happening, then you put yourself 50-100hp below peak power
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01-24-2022, 02:13 PM | #5241 |
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i am on a custom map, but its pretty easy to test on a 100-200 pass, so go for it and post the results.
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01-24-2022, 06:49 PM | #5242 | |
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Did the vacuum lines already. Replaced the IC, hoses and chargepipe. Replaced front inlet with silicone - will do the rear soon, along with outlets. Need to check the solenoids IIRC, there is a way to test them. So here are two pulls. The first is mhd 0 - stock boost of about 6 psi. The car is a turd! LOL! https://datazap.me/u/love-hatethesecars/stage-0?log=0&data=3-22 Second is 1+ It pulls beautifully until all hell breaks loose and it throws a 30ff and drops into limp mode. Can you tell why ? https://datazap.me/u/love-hatethesecars/stage-1-30ff?log=0&data=3-22&zoom=0-112 |
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01-24-2022, 07:14 PM | #5243 | ||
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You are way off boost target the entire pull. You can also see your waste gate duty cycle is near pinned the whole time. Turbos are working overtime but still not meeting boost target.. triggering the cel.
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01-24-2022, 07:48 PM | #5244 | |
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I'm pretty sure shifting around 6k is optimal on a custom tune. |
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01-24-2022, 07:53 PM | #5245 | |
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Otherwise the leaks would be between the urban and the intake, right. They are all new connections. Is there a DIY on pressure testing that? |
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01-24-2022, 08:12 PM | #5246 | ||
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Shot waste gates are also a possibility. Do you hear waste gate rattle ? Bad Boost solenoids have been known to cause weird problems also .
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01-24-2022, 08:45 PM | #5247 | |
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Turbos are shite and need a rebuild. Are you familiar with the flapper kits options? Know which ones are good? I found a vacuum and electrical test for the solenoids. Ill do that tomorrow. |
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01-24-2022, 08:48 PM | #5248 | ||
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01-24-2022, 09:12 PM | #5249 | |
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If you are running something like buraq's here on a 6mt: then your shift map would look more like: 1-2: 6390 (a bit lower due to load) 2-3: 6209 (also a bit lower) 3-4: 5873 4-5: 5443 5-6: 5358 So if you are doing 125+mph things on a tune like that, yes, shifting around 5300-5400 would be beneficial. If you have a dyno of your car, the math won't lie (except for low gears where it can't account for reduced load)
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01-25-2022, 09:31 AM | #5250 | |
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I managed a 7.4s 100-200 on a random pull without my ideal track setup that i usually run for 1/4 mile passes, and hitting a bump and losing traction for a bit shifting 4-5th at 5100
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01-25-2022, 09:47 AM | #5251 |
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With a time like 7.4 on stockers you've gotta be an absolutely wild kill tune, right? My perspective is kinda skewed given my car's weight (4240 with me) but I am aiming for just below that on my twos (on 93 anyways)! It's no wonder shifting that early might be beneficial for you, 4-5 at 5100 is probably bang on. Earlier gears though, there might be a little bit left in it. The gears are pretty far apart, again assuming it's a 6MT. I don't know the AT's ratios off the top of my head
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01-25-2022, 10:48 AM | #5252 | ||
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I wonder on a 100-200, what each 0.1sec represents in term as gap at the end of the run?
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01-25-2022, 11:56 AM | #5253 | |
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01-25-2022, 12:02 PM | #5254 | |
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0.1s at the end might be less than half a car difference.
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01-25-2022, 12:59 PM | #5255 | |
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1-2: 6443 2-3: 6118 3-4: 5795 4-5: 5767 5-6: 5541 If you are open to try these, I'd be curious to see how they do in the real-world. Of course you might want to shift a tad earlier in the lower gears if you aren't hitting full boost. On a side note, I went to an ET estimator, and even if I'm making 575whp on e50 on my twos, I'll still be 0.3 seconds slower than your stock turbo time
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01-25-2022, 02:38 PM | #5256 | |
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i actually tried it all, from 6500rpm slowly dropping my shifts and checking times with logs, i have hundreds of time slips, dragy times and logs to match and for me low 5000rpm shifts work best, it might depend on the health of the turbos as well, mine are pretty tired at this point. Last dyno i made 460whp and 530wtq.
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01-25-2022, 03:32 PM | #5257 | |
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01-28-2022, 03:17 AM | #5258 | |
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The ET estimator is wrong. |
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