07-15-2018, 11:02 AM | #1475 | |
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07-15-2018, 11:44 AM | #1476 | |
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07-16-2018, 09:41 AM | #1477 | |
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07-16-2018, 11:17 AM | #1478 | |
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07-16-2018, 11:27 AM | #1479 | |
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07-16-2018, 11:28 AM | #1480 | |
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07-16-2018, 11:52 AM | #1481 |
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07-16-2018, 01:05 PM | #1483 |
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yes, sure, why do you think most modern cars manufacturers claim max torque 1750-5000-5500rpm flat? because old subaru wrx times are over. nobody wants any noticeable turbo lag, that’s why s55 uses 2 turbos and not one big. I understand that you can kickdown anytime but with more low end torque car feels way less heavy and 8AT gearbox lets you use this torque without switching few gears back and you overtake other cars in a blink while not reving a lot. it’s not a rocket science to mount big turbo on engine, but to make it powerful at high rpms while still having great low end torque is not so easy as it looks
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07-16-2018, 02:26 PM | #1484 | |
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07-16-2018, 04:13 PM | #1485 |
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Hello! I flash my car today with Bootmod3 and I'am newbie this petrol car tuning (old diesel guy ) So Im running stage 2 93 octane, I have FMIC, straight downpipe and charge pipe changed. My car is F30 335i xDrive 2012 PWG. Now I test some logging and post it here, so can You tell if something is wrong.
http://www.bootmod3.net/log?id=5b4cfbc8d10b4304ffb15726 http://www.bootmod3.net/log?id=5b4cfe88d10b4304ffb1572c Here is link. So what You think? Thank you! |
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07-17-2018, 01:07 AM | #1486 | |
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talking about transmission- this 8AT is designed to hold 550nm, so ~600nm is not a problem, no matter what rpm range. |
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07-17-2018, 01:13 AM | #1487 |
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Drives: 2015 335i xdrive Msport Mbrake
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I'm considering a PS2... I'm thinking you guys with PS2's now are probably running Race core intercoolers... I'm thinking if I stick with my current 5" stepcore that the driveablity here in the city shouldn't really be an issue... don't plan on tracking the car soooo...
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07-17-2018, 02:20 AM | #1488 |
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This is a BM3 thread. Need a new thread for turbo physics. I'll provide the following, hoping to close the debate.
All you guys need to know: 1) PS2 works well with EWG OTS. 2) PS2 PWG is a PITA to tune. PWG OTS 2H is a hit and miss. In most cases, you need custom and hugh amount of time to dial in PWG PS2 on a flash only basis, if ever possible at all. Many tuners just gave in to piggyback stack up. 3) PS2 has noticeable lag compared to stock turbo. No question asked. No ego stuff. No whitewash. It's a matter of if the power is worth the lag, which it is in my opinion. I've built, driven, tested and logged PS2. There is no denying lag be felt on the road and be seen from log. I've also experienced almost all the hybrid turbos that's ever available to N55s all the way from PS1, PS2, Dinan, VTTO STG2, TTE460 and G Power 500 (my current setup). On pump gas, PS2 seems to flow more than octane can support, in other words, you can happily leave headroom, making less heat for power consistency. See below thread that physically compares PS2 to other turbos. PS2 is as big as a hybrid can get. Take a look if you want. https://f87.bimmerpost.com/forums/sh....php?t=1501569
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07-17-2018, 05:19 AM | #1489 |
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The 8AT is designed to hold 350 ft/lbs, it can probably hold 500 max. . And M4 have different driveshafts (carbon fiber) and they run DCT. Not to mention the S55 is different from N55.
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07-17-2018, 10:34 AM | #1490 |
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07-17-2018, 11:32 AM | #1491 | |
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07-17-2018, 09:42 PM | #1492 | |
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1) Lag is a perception but there is no denying of its existence. I know many cannot live with A45 AMG sluggishness while the other feel no lag at all. However, to put things in the context, we did back to back log testing of stock turbo and PS2. With same car, same map, same fuel, same hardware, same testing condition or same everything except for turbo, there is a 800-1000rpm spool delay with PS2 on 3rd gear, compared to stock turbo. And we certainly feel that 1k rpm power loss on the road, most of the time. 2) Tuning makes a difference. But no kidding, turbo is mechanically driven by exhaust gas momentum. Nobody half opens waste gate to slow it down when you're calling it out. Some map would progressively reduce duty circle when boost gets close to target, but that's about it. However, going from off boost, all maps do absolutely the same thing - spool up the stupid snail as quick as possible. That's why tuning will not make a laggy turbo feel any less laggy. 3) Turbo responsiveness and power band are two entirely different things. It's a common mistake to think a quick spool = low end torque surge. Truth is, it's the down low target that dictates down low torque. And turbo responsiveness dictate how quick you get to that target. Another common misunderstanding is downshifting to higher rpm makes instant power. Not remotely true. Turbo always needs time to spool up, only at a higher rpm it spools quicker, something you don't get to see from dyno chart. Hence the bloody fact - in real world turbo responsiveness affects power delivery throughout the band. Turbo engineering spares no effort to achieve zero response time to any pedal input like with NA - instantly power anywhere, and there is no torque surge anywhere. Let's close the topic. PS2 is laggy but is powerful enough to justify the lag, in my opinion.
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07-18-2018, 03:13 PM | #1493 |
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Just got my fabspeed catted DP installed today, have chargepipe and FMIC installed already as well, I'm about to get Bootmod3 I want to run 93 Oct, OTS Stage 2 Map
Question: Will the tune make my car louder?
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07-18-2018, 03:36 PM | #1494 |
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It depends.
Cold start off - quieter on initial startup Burbles - anywhere from none to aggressive. none is very quiet. aggressive is very loud. these are user selectable. cruising - no difference over stock form what I can tell. the DP will make your exhaust note louder regardless of tune.
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07-18-2018, 04:24 PM | #1495 |
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What exhaust do you have with the DP? How much louder is it and how do you like it? Any drone?
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07-18-2018, 10:09 PM | #1496 |
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When you select a map how long does it usually take for bootmod3 to import the tune? I selected a tune and its stuck on importing....please wait.
I'm going to try again in the morning. How long does the import process usually take? |
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