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Turbo lag after 7.5" FMIC upgrade?
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07-02-2020, 01:26 AM | #45 | ||
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Huh! Didn't even realize that was being logged. What the hell is traction control doing kicking in at 4800rpm in 2nd under full 17psi anyway? At that point the Michelin PS4s should be glued to the road, no? Or is this preventing the car from going sideways? I did notice (once) in 3rd, under full boost going 50+, the car did feel like it torque steered, or wanted to steer sideways, which is obviously pretty odd for RWD. Recent alignment, etc. Thoughts welcome. Quote:
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07-02-2020, 01:31 AM | #46 |
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BTW, to those insisting 7.5" and 5" are identical in terms of lag, here's the response I got from Ken Atkinson @ Wedge Performance. If memory serves, he created the original OTS maps for MHD.
We can do a custom tune, but your core volume is too high for the turbo to fill up now over the rpm increase. You should have installed the 5" step. I'm silly enough to downgrade to achieve the perfect response, but thoughts welcomed. |
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07-02-2020, 06:55 AM | #48 |
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Im pushing 20psi and mine never gets above 245
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07 E92 335i 6MT, MMP inlets, DCI, VRSF 7.5 competition intercooler, VRSF catless downpipes, VRSF chargepipe, 335is clutch, Vader Solutions stage 2 LPFP, MHD stage 2+, Hawk HPS 5.0 pads, R1 Concepts drilled slotted rotors, TSW Nurburgring 19x8 19x9.5
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07-02-2020, 07:20 AM | #49 | |
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Chris@VargasTurboTech1932.00 |
07-02-2020, 08:03 AM | #50 | |
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i have tc kick on in 3rd gear if i dont log with it off...and im awd
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2009 335i xDrive AT / 177k+ miles
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07-02-2020, 08:50 AM | #51 |
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Thats essentially the response i got from another bmw forum that isnt to be mentioned on here
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07 E92 335i 6MT, MMP inlets, DCI, VRSF 7.5 competition intercooler, VRSF catless downpipes, VRSF chargepipe, 335is clutch, Vader Solutions stage 2 LPFP, MHD stage 2+, Hawk HPS 5.0 pads, R1 Concepts drilled slotted rotors, TSW Nurburgring 19x8 19x9.5
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07-02-2020, 11:49 AM | #52 |
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I'm guessing you have a factory oil cooler.
Mine does not. Not sure if I should be concerned or not, since it never actually overheated. I guess I could always run the MHD max-cool-mode or whatever, probably at a cost. |
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07-02-2020, 11:51 AM | #53 |
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07-02-2020, 11:55 AM | #54 |
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I assume this applies to a FMIC-to-FMIC scenario just as much as a TMIC-to-FMIC one, then.
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Chris@VargasTurboTech1932.00 |
07-02-2020, 11:56 AM | #55 | |
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I thought bmw would install one free of charge if yours didnt come with one. However idk if that ship has sailed given the age and probability of not being the original owner
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07 E92 335i 6MT, MMP inlets, DCI, VRSF 7.5 competition intercooler, VRSF catless downpipes, VRSF chargepipe, 335is clutch, Vader Solutions stage 2 LPFP, MHD stage 2+, Hawk HPS 5.0 pads, R1 Concepts drilled slotted rotors, TSW Nurburgring 19x8 19x9.5
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07-02-2020, 12:01 PM | #56 | |
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07-02-2020, 02:04 PM | #58 |
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A bigger intercooler can definitely add more lag, it's about the velocity of air and time getting through the system. Remember, velocity doesn't increase with increased boost.
For many people that wring out turbos very hard, or live in extreme climates, going to a larger intercooler is a pretty good trade, but if you're going for responsiveness, that's really a different setup. There is some decent literature out there about the actual time differences in different applications, and IIRC a large and lousy flowing FMIC can add something ridiculous like well over a second of lag. Which means it's worth while to size the FMIC correctly for your application... but if you have to err, err on the big side. High IAT's is awful for power. Some of the large single or twin guys may not notice considering their powerband and how the car is used. If you're not opposed to the idea, a smaller (well designed) FMIC and a meth nozzle would be a good means of controlling temps and keeping responsiveness as good as you can get. I live in Arizona, so the biggest honking intercooler I can get in there is pretty much required. |
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07-03-2020, 12:31 AM | #59 | |
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I'd consider an aftermarket oil cooler, but right now I haven't broken 265, so probably not worth it. Also, no idea who's even reputable in that space. |
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07-03-2020, 12:33 AM | #60 | |
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I'm in PR, the weather here is about 20 deg cooler relative to yours (not sure how you do it, man). And I don't wring my hamsters that hard, max 18psi. So I'll probably end up with a 5" at some point. |
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