02-17-2017, 01:06 PM | #23 | |
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great gains from FMIC and cobb dynos showing gains from FMIC http://www.cobbtuning.com/bmw-n54-power-gains/ It's possible this is N54 specific info that I'm incorrectly mapping to N55. Regarding piggyback vs flash tune, my understanding has been that piggyback is "tricking" the ECU by intercepting signals, so because ECU is not aware of the actual engine load, it can't advance or retard ignition effectively and it will only retard timing when the knock sensor detects something (e.g. piggyback can't alter fueling and timing at a very granular level). That's why BMS uses the "back end" DME flash (e.g. flash tune) in addition to the piggyback. When i was looking into RB turbos for my N54 days, the ideal setup seemed to be combine both, such as cobb flash tune to control fuel, timing, vanos, and JB4 piggyback to control boost and methanol (with the methanol being the key trigger to add JB4) I think for tune only, it probably doesn't matter between JB4 vs. Cobb, and the nuance matters if its a more heavily modded situation. I always would like to go flash tune whenever possible for the timing and fuel control (i.e. I am using EPL flash tune on my 996TT right now) 39xx lb car is too much for me, I get that it is a great car and does well to hide the weight. Even my 34xx lb 996, I am thinking about maybe converting AWD to RWD to get the weight down even lower full disclosure, in my garage, the 996 (and F80 M3 before that) got the modding attention, the X135 continues to be a great (stock) family hauler. |
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02-17-2017, 01:15 PM | #24 | |
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I am not sure what your price point was, my reference point for a ~6s 0-60 mph car is an NC mazda miata, and you can get those for ~$15k, with already a lot of choice handling mods. that's a really great sporty car for very low cost, IMHO Another thing to consider is the C5 z06 goes for ~$20k now, and those are ~117mph trap speed cars, and C6 z06 is in the $30-40k range and that's a ~125mph trap speed car |
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02-17-2017, 01:24 PM | #25 | |
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You stated: The piggyback can't alter fueling and timing at a very granular level. You should probably know that piggybacks do not alter timing or fueling (sans a flex-fuel wire install), at all. That's all the factory DME. And it has been shown, time and time again, that the factory DME is actually very, very good at timing control, hence why the JB4 works so well and has been so successful. Yes, the timing control is limited to the DME and its use of the knock sensor. But it works well. Knock is not an issue. But you mentioned the DME not knowing actual engine load, presumably as an attempt to identify a "fail safe" that's not effective when you use a piggyback. But aren't you're ignoring that the aftermarket reflash is going to have to alter that level. So perhaps your factory "fail safe" wouldn't be retained anyway? Regardless, no one is arguing against flash tunes, they are superior in a number of ways. Yes, flash tunes are often used underneath a piggy in order to implement a more advantageous timing curve while retaining some of the things the piggies do well. No question 3900 lbs. is a lot. That wasn't the point. The point was, it weighs the same as a 335 xdrive sedan. So are you suggesting that it's wasted for anyone to put a suspension or a swaybar on one of those? BMWs staple sports sedan? A better handling car is a better handing car, period. Aesthetics aside. Why would you have an issue with someone wanting to make their family hauler drive better? You only like better handling if you're driving a sports car?
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'02 S54 M3 (500/500 GC/Koni)
'08 N54 135 (JB4, DCI, BMW PS/Bilstein B6s, H&R M3 FSB, Strongflex FCABs) '14 N55 X1 (JB4, BMS DP, BMS Intake, Alpina TCU reflash, H&R Sports, Bilstein B6s, E93 M3 RSB, Strongflex FCABs, baby seat) '08 N54 535xi touring (Bilstein B6s, Downpipes, MHD tune, baby seat) Last edited by PrematureApex; 02-17-2017 at 01:41 PM.. |
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02-17-2017, 01:35 PM | #26 | |
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http://www.motortrend.com/cars/bmw/x...1-first-drive/ Mind you, I have no options, so I'm close to the 35xx figure. Still, it's a bit heavy, I guess, for a sporty car. |
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02-17-2017, 01:44 PM | #27 |
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So not only do I disagree with your definition of "fast", but now I may have to consider if I disagree with your definition of "sporty".
Is a base 4 banger X1, "sporty". Hmmm... We could go on all day about that....
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'02 S54 M3 (500/500 GC/Koni)
'08 N54 135 (JB4, DCI, BMW PS/Bilstein B6s, H&R M3 FSB, Strongflex FCABs) '14 N55 X1 (JB4, BMS DP, BMS Intake, Alpina TCU reflash, H&R Sports, Bilstein B6s, E93 M3 RSB, Strongflex FCABs, baby seat) '08 N54 535xi touring (Bilstein B6s, Downpipes, MHD tune, baby seat) |
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02-17-2017, 04:21 PM | #29 |
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02-17-2017, 04:41 PM | #30 | |
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Life is tough for Bmw if the staple sport sedan is 3900lb awd car. Luckily it's a 3500lb rwd car or some sort (m2/3/4) Yes my bias is to keep the family hauler comfy and focus sport on the sports car. I tried the do it all route with f80 m3 and it isn't as fun for me as the always on focus of a sports car. Btw, how much smaller are Sti, golf r or focus rs than an X1? Those are super interesting awd hatches to mod |
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02-18-2017, 08:36 AM | #31 | |
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I've owned 5 WRXs and STIs combined, and won't own another one. The EJ isn't reliable enough to play with. And the STI isn't sold as a hatch anymore. The R and RS weren't out when the N55 X1 came out...so there's that. And the X1 has some more potential in the engine department. But yeah, it you were lining up in 2015 to buy a new $50k N55 X1 with the intention of lower it and upping the power in an attempt to make it a 335 hatch...well...the Golf R w/ a roof box certainly should give you some cause for pause. Make that a lot of cause. Regarding comfort, I'll just say our X1 on H&Rs/bilsteins/M3 rear sway on non-runflat tires isn't more offensive in the ride department than stock. Handles much more tidily though. There really is no drawback. We have our quick N55 small wagon.
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'02 S54 M3 (500/500 GC/Koni)
'08 N54 135 (JB4, DCI, BMW PS/Bilstein B6s, H&R M3 FSB, Strongflex FCABs) '14 N55 X1 (JB4, BMS DP, BMS Intake, Alpina TCU reflash, H&R Sports, Bilstein B6s, E93 M3 RSB, Strongflex FCABs, baby seat) '08 N54 535xi touring (Bilstein B6s, Downpipes, MHD tune, baby seat) Last edited by PrematureApex; 02-18-2017 at 08:42 AM.. |
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02-18-2017, 11:47 AM | #32 |
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Yup that's my thought exactly! X1 35 for $50k to mod is not a great path vs what's out there.
I admit to being tempted by getting a "square" setup of sticker tires for our x135 but I always have groceries or my dog in the car when I drive it anyway so I'm always grannying it! |
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