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  • 08_335i's Avatar
    Today, 11:35 PM
    CP and BOV sold!
    2 replies | 43 view(s)
  • subaru335i's Avatar
    Today, 11:33 PM
    subaru335i replied to a thread Single turbo VANOS testing in N54
    Thermo and fluids were some of my favorite classes. I feel like there should be a law you have to take them before modding you car lol. Might weed out some of the E90post knuckledragging mouthbreathers and their wheel removal DIY's.
    138 replies | 3958 view(s)
  • Chris@Boost Concepts Inc's Avatar
    Today, 11:33 PM
    Nugs, Thanks ks that is great information to have!! I will dou le check the international flaterate fees and add an international shipping option to the website!! Thanks!!! Chris
    38 replies | 639 view(s)
  • bradsm87's Avatar
    Today, 11:33 PM
    bradsm87 replied to a thread Single turbo VANOS testing in N54
    My understanding is that volume flow well and truly comes into play as well as mass flow. If not, turbos would never make boost because same mass flow going through the compressor as the turbine. It can't make something out of nothing. This is why EGT does make a decent difference to spool. The more EGT, the higher the volume flow compared to the compressor side. Also, during spool, intake manifold pressure is higher than exhaust manifold pressure, according to every single BorgWarner MatchBot calculation I've done. I believe the huge factory spool mode overlap is there because some air 'blows straight through' the engine near TDC at end of exhaust/beginning of intake stroke. This gets thhe turbo up into its efficient flow rate much quicker and is why full load, low rpm compressor surge is not an issue on these engines.
    138 replies | 3958 view(s)
  • foe516's Avatar
    Today, 11:14 PM
    any updates on when the first batch might be arriving?
    43 replies | 1229 view(s)
  • Nugs's Avatar
    Today, 11:13 PM
    No customs issues unless the value is over AUD$1000, then we have to pay duty and GST. But that's handled on our end. Some accommodating vendors will always make sure the declared value is under AUD$1000.
    38 replies | 639 view(s)
  • foe516's Avatar
    Today, 11:12 PM
    foe516 replied to a thread Single turbo VANOS testing in N54
    i feel like i am back in thermo and fluid dynamics class.
    138 replies | 3958 view(s)
  • Mrpikolo's Avatar
    Today, 11:08 PM
    850 rpm sooner than the 2+? Is this running the same compressor and turbine as the 2+ with your manifold and housing?
    90 replies | 3479 view(s)
  • AdminTeam's Avatar
    Today, 11:06 PM
    Hey YHUDian508: :text-welcomewave:
    0 replies | 0 view(s)
  • subaru335i's Avatar
    Today, 11:01 PM
    subaru335i replied to a thread Single turbo VANOS testing in N54
    I agree with everything you have said but this isn't really true. Wind is caused by pressure differences. Air molecules go from high pressure to low pressure. Those pressure differences are caused by uneven heating of the surface from the sun (among other things). Edit: And I don't mean to nitpick, I just think that last analogy might confuse the point a little bit.
    138 replies | 3958 view(s)
  • noorj's Avatar
    Today, 11:01 PM
    noorj replied to a thread DI Tuning Discussion in N54
    Where are you getting that number from? 200 bar sustained would help, but the problem as Tony stated is the injection window. Use my math from the post above and work out what 35 g/s (=35mg/ms) would net you!
    61 replies | 1668 view(s)
  • noorj's Avatar
    Today, 10:56 PM
    That is a very nice data acquisition setup you have there! Props for doing it the right way. Is that amount of variance bank-bank in BP what you normally see? I'm curious as to where you think it comes from. Also what TC's do you have in there pre-turbine? Size/exposed or non exposed tip?
    90 replies | 3479 view(s)
  • V8Bait's Avatar
    Today, 10:51 PM
    V8Bait replied to a thread Single turbo VANOS testing in N54
    Think about wind. Wind can do work on a windmill simply by moving. If you move it really fast, it will do lots of work on that windmill. But, wind doesn't have pressure, it's just a moving airmass. Heating up that air, in a pipe with only one exit, and assuming the pressure increase is negligible, is similar to increasing the wind by a lot. Since the turbo is designed, like a windmill, to extract energy... you see this in spool.
    138 replies | 3958 view(s)
  • richpike's Avatar
    90 replies | 3479 view(s)
  • Tony@VargasTurboTech's Avatar
    Today, 10:49 PM
    This car will be at the track very soon with this set up on it..:)
    90 replies | 3479 view(s)
  • noorj's Avatar
    Today, 10:46 PM
    noorj replied to a thread Single turbo VANOS testing in N54
    Thanks @V8Bait & @The Convert ! Just trying to help out the community, love seeing the progression of the entire platform in the past year. Correct, but the point I'm making is we can change that mass flow into the TB. No, as V8Bait pointed out PV=nRT so it will help spool. But it will help spool independent of mass flow, where more mass flow will still again help spool. Again V8Bait is corret, the exhaust cam is exhaust maximum opening point EMOP in degCA bTDC. Intake cam is IMOP in degCA aTDC
    138 replies | 3958 view(s)
  • V8Bait's Avatar
    Today, 10:42 PM
    So, what he's saying is to stop thinking and assume your role as sheeple. Becuz, you know brah, reading logs and stuff is really hard. We should definitely just listen to what other sheeple think, and not listen to what other experts think, because they aren't popular with the sheeple. Tony is mean and picks fights with others and it hurts my feelings, so I'm going to stay in my safe place with the other sheeple. Who tuned your car? What revision are you on?
    259 replies | 10794 view(s)
  • NniftyFour's Avatar
    Today, 10:40 PM
    Your not wrong about vendors. But that said there have been several tuning situations where both of them showed they did not understand essential tuning concepts. Their prolonged failure to understand how PID systems worked was shocking and frankly worrying. Other examples include extreme timing maps, expecting & relying on the knock control system to sort it out and save the motor. As well as thinking you can control boost blindly with just WGDC. Granted this was all in the past, and they've likely learned all these lessons by now... But for my dollar learning on customers cars which they unarguably did is unacceptable. There's also a LIST of motors that blew with their tunes. I know of 3 which I personally saw the datalogs on. They'll argue that people knew their tunes were bleeding edge and the motors had mechanical problems... Blah blah blah so on. Whatever, there's about as many on the forums as every other tuner combined. (Still a small sample size, I know people go online when things go wrong.) Anyway there's way to many little things that added up to me not trusting them. All in the past, but still too much IMO.
    259 replies | 10794 view(s)
  • richpike's Avatar
    Today, 10:40 PM
    Awesome results! And I apologize if I missed it, but is this setup going on your skinny tired car? Or is that still planned to be a Stg3 setup? -Rich
    90 replies | 3479 view(s)
  • subaru335i's Avatar
    17 replies | 556 view(s)
  • Tony@VargasTurboTech's Avatar
    Today, 10:38 PM
    First test log on my way home. This is the same tune I was running on 2+, I just backed boost way down, timing way down, and added the 4 bar map sensor to the mix. The MHD logs are not showing true boost because of the scaling, so here are the AEM logs. This is directly off the manifold not on the charge pipe, so you cannot get false readings if the throttle closes. Yes you are seeing that correctly, basically 25 psi at 3K RPM in 4th. I included one of the last pulls from the dyno on the old turbos, while boost is apples to apples, as you never get the same load on the dyno as the street, but you can see its literally 850RPM faster to 25 psi. What is also very eye opening is, on the dyno back pressure should be lower as its not loading it up quite as hard. The new GC turbos, 19 psi BP at 25 psi boost, Stock frames, 31 psi back pressure at 25 psi boost. The results could not be anymore inspiring! Cannot wait to get this tune dialed!
    90 replies | 3479 view(s)
  • V8Bait's Avatar
    Today, 10:38 PM
    V8Bait replied to a thread Single turbo VANOS testing in N54
    If you have EGR effect the engine is moving less airflow as a system. Maybe your problem is you're not thinking of the big picture, as soon as the turbo compresses air, it's now in a closed system until it leaves the turbine. If you move it through the engine into the manifold, back into the engine, then back into the manfiold... you're decreasing mass flow as the engine can only hold X amount of air. Spool speed is independent of EGT. But it's not independent of what that EGT means in this system- pressure and velocity. In a system with adequate flow to keep pressure out of the way (say a big turbo), increasing the energy of the exhaust (adding heat) will increase the velocity. This happens since pressure, temp and velocity are all related, and we are keeping and pressure increase negligible. More energy is simply siphoned via the turbine in this case. So, mass flow via overlap, and high energy via afr (or timing, whatever costs you the least power... so afr pl0x) combines to help spool if you can take advantage of these things. On the tables, decreasing the values of the exhaust cam retard it and decreasing the numbers in the intake cam advance it. If you lower both numbers you create overlap. This is because one is measured BTDC and the other ATDC.
    138 replies | 3958 view(s)
  • AdminTeam's Avatar
    Today, 10:30 PM
    Welcome Mw402mts, take a look around, I think you will like what you see.
    0 replies | 1 view(s)
  • richpike's Avatar
    Today, 10:23 PM
    Ditto - welcome to BB. And I'd be fairly careful with the N20 - there has been a number of discussions around the N20 being fairly fragile. For example: http://www.bimmerboost.com/showthread.php?66955-The-BMW-N20-is-fragile-GSR-Autosport-finds-the-N20-2-0-liter-torque-limit-the-hard-way-and-what-we-have-learned Having said that - it's still one of my favorite BMW engines. I'm amazed at the efficiency they get out of it. -Rich
    2 replies | 43 view(s)
  • ///MPOSTER's Avatar
    Today, 10:10 PM
    Hey , Welcome to BB. If you are looking for a tune for your N20 , take a look at the JB4 tune. You could also find an intake and other goodies on that site. Here you go. http://burgertuning.com/BMW_N20_Turbo_228_328_528_Performance_Upgrades.html
    2 replies | 43 view(s)
  • Bumbleb's Avatar
    Today, 09:55 PM
    Beautiful. I am in Clearwater and would love to see the set up sometime. Please do let me know if you are ever out this way. I would love to pick your brain. -Brandon
    100 replies | 4196 view(s)
  • AdminTeam's Avatar
    Today, 09:52 PM
    copsaretops, we appreciate you taking the time to join.
    0 replies | 2 view(s)
  • spxxx's Avatar
    Today, 09:49 PM
    Interesting first post...
    259 replies | 10794 view(s)
  • Terry@BMS's Avatar
    Today, 09:47 PM
    Terry@BMS replied to a thread Single turbo VANOS testing in N54
    That sounds reasonable. I'm just trying to get my finger on the pulse of the details with this one. The mass flow out the exhaust port has to be equal to the mass flow in the throttle body plus the mass of the fuel injected plus any reversion of the previous stroke, right? Wouldn't that also imply that spool speed is largely independent of EGT which we know isn't the case? Another question for those who have spent more time with the VANOS tables. Normally to increase overlap you'd retard the exhaust and advance the intake. For a given spool up load though the spool VANOS tables (factory values that we're basically using here) move exhaust from say 100 to 84 and intake from 100 to 68. I wonder if I've been reading the tables wrong.
    138 replies | 3958 view(s)
  • Chris@Boost Concepts Inc's Avatar
    Today, 09:37 PM
    You guys are certainly giving some strong incentive to focus on the multi pump setup.... as for the hobbs switch or trigger.. you really don't want all the extra amperage draw for normal driving and it isnt a great idea to move that much fuel around when it isn't needed.. it will heat up the fuel in the tank and make it more prone to boiling on the suction side of the pump which cause a slew of undesirable occurrences such as pump cavitation, air pockets, increased fuel emissions in the tank etc.. a trigger to enable the pump when its needed is a good idea unless it is a drag only car that won't be seeing my idling and cruising. Chris
    38 replies | 639 view(s)
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