09-23-2018, 03:02 PM | #23 |
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There are vendors that I know of that will be announcing some major power upgrades for the N55 motor that will easily have the N55 motored cars surpass 450whp. Coming very very soon I'm told towards this years end.
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09-23-2018, 03:22 PM | #25 |
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09-23-2018, 03:52 PM | #26 | |
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The main bottleneck is the stock fuel system. Can't deliver enough fuel once you're in ~430whp mark (roughly - give or take some.) I did 409 whp / 455trq on 15 psi and 453 whp / 466trq on 18 psi (with a crashing HPFP) on 93 octane with PS2, FBO, Tune on stock fuel system. I am now running a new tune thats running 16-17 with perfect fuel pressure throughout and better timing... hopefully can throw her back on the dyno soon. A bigger turbo is definitely an upgrade (even on lower boost - at least its efficient) but I'd probably say plan for more fuel down the line if you want to make the best of it. 16-17 psi is fun, 20+ psi would be beastly! (500whp+) Hope that helps.
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09-23-2018, 09:11 PM | #27 |
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It does, immensely.
When you mention fuel upgrade, are we talking simply a higher flow pump or a higher flow pump with fuel lines to handle the extra fuel flow? Are the stock fuel injectors able to support up to 500 HP? In other words, will a simple fuel pump swap address the needs of the PS2 turbo upgrade? |
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09-23-2018, 09:36 PM | #28 | |
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1. HPFP upgrade - expensive and new. Few early adaptors are running it with promising results. http://tuningtechfs.com/ttfs-n55-hig...p-single-pump/ 2. Meth Injection for fuel 3. Port Injection I prefer option 1 the HPFP upgrade as the DME has complete control of the pump/fuel. With Meth or PI you have to run an external controller or JB4 (which I'm not a fan of) and to me it effects drivability with the hesitations (to some may not mind, drove me crazy lol). I ran JB4 for 1.5 years and full flash is much smoother. HPFP supposedly supports 20+ psi but haven't seen a lot of results yet. Thinking about picking one up down the line though. Meth and Port Injection are tried and proven... so thats a good option Im just not a fan of the external controller.
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09-23-2018, 10:20 PM | #29 | |
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I see the junction you are at...it's essentially going to cost you a minimum $2300 to get to the next level. At the boost levels you are currently at, using a controller of any sort (even a $50 hobbs switch on the CP....lol) is just not something I would want to do either. Your post has helped immensely, thank you! |
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09-23-2018, 10:32 PM | #30 |
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Keep in mind that there are still really good gains going to PS2 with stock fuel system, especially going from PWG. The bigger turbo allows you to safely run a little leaner, more timing, way lower IAT, way lower exhaust back pressure. This all means you can make more power on lower boost and more power for a given fuel flow limit. You also don't get anywhere near as much of a severe drop-off past 5000rpm.
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09-24-2018, 03:31 PM | #31 |
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I'd like to also point out that going ps2 does also bring in some turbo lag. You shift the usable power band forward in the rpm range ~1.5k. So below 3k you will feel relatively slow compared to stock, then you get kicked in the ass. That's not very fun on the street as the top end is pretty unusable for reasonable drivers. You have to go to the track or strip to really get your moneys out of going ps2. This is all from reading the threads and looking at the graphs around here on the forum
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09-24-2018, 04:36 PM | #32 | |
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https://f30.bimmerpost.com/forums/showthread.php?t=1533984 |
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09-24-2018, 07:44 PM | #33 | |
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Will be perhaps more comparable to Bigboost offerings and Speedtech offerings and 93 Octane friendly at over 450whp to 500whp or 500whp + with E85. All depending also on the fueling setup of course and tune which I believe will be offered with the kits. Hey they have some built 4 cyl EVOs making 600whp on 93 oct,big turbo,big inj,tune,fuelpumps and no E85. 6 cylinder will not even need as much boost as a built 4 cylinder to make the same hp and on 93 octane. I could see it happen. Will be based on fueling and tune.
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09-24-2018, 08:52 PM | #34 | |
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09-24-2018, 09:20 PM | #35 | |
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09-25-2018, 01:16 AM | #36 |
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09-25-2018, 03:37 AM | #37 |
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09-25-2018, 08:05 AM | #38 |
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09-25-2018, 08:06 AM | #39 |
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Well good luck waiting for that.
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09-25-2018, 11:40 AM | #41 |
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New Single turbo kits for the N55. VTT is one of the vendors. Google it. Thats all I will say for now till the other is 100 percent confirmed.
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09-25-2018, 12:42 PM | #42 | |
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To bad their in Cali or I would definitely have them install it for another $2500... sounds like a great set-up for under $3,975 Or is there something else coming out... this is very interesting about oil they recommend... Forced Performance Recommendations for Motor Oil.pdf Last edited by FastF30; 09-25-2018 at 01:04 PM.. |
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09-25-2018, 01:24 PM | #43 | |
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Damn the installation price for RWD is only $600. Is it really that easy to swap turbos? I haven't really considered it (looking at LSD and coilovers first) but for the price it's tempting. I'm assuming LPFP and PI is needed as well.
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09-25-2018, 01:42 PM | #44 | |
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The reason I'm more interested in this than a bigger turbo has to do with the streetability lag issue... if both a large turbo and this one raced in a 1/8mile (100mph) and both pushing 500whp... I beat stage1 one would win due to spool-up response... and who's crazy enough to race over a 100mph on the street... I'm sure many... but not me... |
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