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Thread: N54 top mount?

  1. #226
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    Click here to enlarge Originally Posted by dzenno@ProTUNING Freaks Click here to enlarge
    Yeah, you really don't need a JB4 or a G5 to pull this off. A basic TMAP voltage clamp might also work as a 30FF/limp code won't trigger immediately. It takes a while under WOT to get it to trigger. You could probably even use a JB+ to pull off the DME "fooling" part of it LOL
    Definitely need a G5 ISO or procede to pull it off properly.

    If boost is not within 1/3psi after a plausible spool range you'll get a limp. And boost moves around a lot based on baro, weather, IAT, DTC, etc, even with a low fixed load target. You could set the load targets all to say 4psi and run a 3.75psi map clamp but then you'd loose the throttle control and run in to various other issues as boost target will still vary itself even at a low load like that. Also, if the DME is no longer aware of true load you need to alter the fuel pressure signal back as a function of actual load vs. DME observed load to keep the fuel trims in range. Not to mention you need the piggyback to also spoof the no longer functional wastegate solenoid load or you'll get an instant limp there too.

    Your best best if you wanted to try to tune a single via flash only would be to use the factory solenoids and inverse several of the tables. It could work in theory if Cobb made a few changes but IMHO total waste of time. It would never be as good as the simple external solution.
    Last edited by Terry@BMS; 02-11-2013 at 02:02 PM.
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    Click here to enlarge Originally Posted by Terry@BMS Click here to enlarge
    Have not been reading the thread but if you need any help on the tuning end just email me. Since the JB4 is not running boost you'll need to set its target to something close to where you have the MBC set, maybe slightly higher, to avoid unwanted throttle closure. But low enough the throttle does close if you start to spike. Still waiting for a single turbo car to appear locally so we can work out the boost control logic. Should be pretty easy. Maybe at some point I'll just start working with you on it remotely so we can make some positive progress there. Click here to enlarge
    Thanks Terry. I'm still getting that misfire on cylinder 6 with new injector / coding, plug, coil, HPFP. I'm thinking of replacing the coil driver and injector driver transistors in the DME to see if that works. However, everyone else who has done that had a complete component failure, whereas I am only having an interemittent issue. Not sure if there is any such thing as a "weak" (but not fully compromised) transistor. Can that be? Or do they just crap out suddenly and completely?

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    Click here to enlarge Originally Posted by Eleventeen Click here to enlarge
    Thanks Terry. I'm still getting that misfire on cylinder 6 with new injector / coding, plug, coil, HPFP. I'm thinking of replacing the coil driver and injector driver transistors in the DME to see if that works. However, everyone else who has done that had a complete component failure, whereas I am only having an interemittent issue. Not sure if there is any such thing as a "weak" (but not fully compromised) transistor. Can that be? Or do they just crap out suddenly and completely?
    Doubtful there. They normally work or don't work. Leak down in that cyl was within spec? Option B is to just disable misfire detection... Click here to enlarge
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    Click here to enlarge Originally Posted by Terry@BMS Click here to enlarge
    Doubtful there. They normally work or don't work. Leak down in that cyl was within spec? Option B is to just disable misfire detection... Click here to enlarge
    Yeah, forgot to mention leakdown AND compression tests were consistent between cylinders. I also cleaned the intake valves.

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    Turbo lag?

    I did a 6th gear pull just to test the best spool possible from this turbo. With current "tuning" it doesn't look too bad. Hitting 10 psi by ~2900 RPM and full boost (14 psi at current setting) by about 3200 RPM Click here to enlarge

    Click here to enlarge

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    Nice spool. It is knocking multiple times in that pull.
    700 and change

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    Nice build dude!

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    Click here to enlarge Originally Posted by The Ghost Click here to enlarge
    Nice spool. It is knocking multiple times in that pull.
    Yes that log has a unhappy timing curve, a question to the OP has Terry seen any logs? @Terry@BMS?
    Click here to enlarge
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    Less laggy than I thought it would be. Congrats
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    Click here to enlarge Originally Posted by lulz_m3 Click here to enlarge
    You should have took it to the dealer and asked for the HPFP recall work to be done just to see their faces, lol.
    I actually did that LOL... Was pretty priceless. 3/4 of the techs at a fairly large dealership crowded around car.
    Click here to enlarge
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    Click here to enlarge Originally Posted by ar design Click here to enlarge
    I actually did that LOL... Was pretty priceless. 3/4 of the techs at a fairly large dealership crowded around car.

    Haha... makes me look forward to the new battery cable recall that just came out.

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    delete
    Last edited by enrita; 02-22-2013 at 12:20 PM.
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    Mini-update

    New manifold w/ better o2 sensor placement. I invented a multi-chambered sensor tube to divert gases to the sensor for fast response, while keeping them cooler. The way they work is: Positive pressure gas is diverted into the first chamber which travels down the tube to the sensor, croses over to the second chamber, and is drawn back out by the low pressure zone behind the tab, which is created by the exhaust gases flowing over and around the tab. This is pending patent, pending, the application to be filed for future patent of the pending state (don't sell my $#@! LOL)... But seriously, I call dibbs.

    Also, please be nice regarding my TIG welding "skills"; I have never tigged until about 2 months ago Click here to enlarge

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    Click here to enlarge

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    Click here to enlarge Originally Posted by Eleventeen Click here to enlarge
    New manifold w/ better o2 sensor placement. I invented a multi-chambered sensor tube to divert gases to the sensor for fast response, while keeping them cooler. The way they work is: Positive pressure gas is diverted into the first chamber which travels down the tube to the sensor, croses over to the second chamber, and is drawn back out by the low pressure zone behind the tab, which is created by the exhaust gases flowing over and around the tab. This is pending patent, pending, the application to be filed for future patent of the pending state (don't sell my $#@! LOL)... But seriously, I call dibbs.

    Also, please be nice regarding my TIG welding "skills"; I have never tigged until about 2 months ago Click here to enlarge

    Click here to enlarge

    Click here to enlarge
    I hate to be the bearer of bad news, but I talked to a company who was making N54 single cast manifolds about 6 months ago, and I asked them about keeping O2's alive pre-turbo. They basically described what you just did to me, special chamber to get the exhaust gas to the sensor quickly while also keeping it cool. Sounded like a good idea, I am not sure what they did with it. But they already had manifold cast and testing with the tubes as he sent me pics. If they didn'ty patent it, $#@! make it yours!!

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    Cool idea! Click here to enlarge

    (pun intended)
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    Click here to enlarge Originally Posted by VargasTurboTech Click here to enlarge
    I hate to be the bearer of bad news, but I talked to a company who was making N54 single cast manifolds about 6 months ago, and I asked them about keeping O2's alive pre-turbo. They basically described what you just did to me, special chamber to get the exhaust gas to the sensor quickly while also keeping it cool. Sounded like a good idea, I am not sure what they did with it. But they already had manifold cast and testing with the tubes as he sent me pics. If they didn'ty patent it, $#@! make it yours!!
    It's cool, I also have an idea for a blanket with sleeves that I think will make me Millions!

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    Click here to enlarge Originally Posted by Eleventeen Click here to enlarge
    It's cool, I also have an idea for a blanket with sleeves that I think will make me Millions!
    Click here to enlargeClick here to enlargeClick here to enlargeClick here to enlargeClick here to enlargeClick here to enlargeClick here to enlargeClick here to enlarge

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    Click here to enlarge Originally Posted by Eleventeen Click here to enlarge
    It's cool, I also have an idea for a blanket with sleeves that I think will make me Millions!
    In for a pink blanket with sleeves. It gets cold in Wisconsin and I'd totally rock one while driving the car.
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    Mini Update II

    I got the hot parts back from coating. I'm currently working on reassembling everything and hope to have it up and running next weekend.
    Attached Images Attached Images  

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    Click here to enlarge Originally Posted by Eleventeen Click here to enlarge
    I got the hot parts back from coating. I'm currently working on reassembling everything and hope to have it up and running next weekend.
    That looks beautiful...
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    Wow, sexy.
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    Thanks, guys. Had to stop working on the car today to go out to dinner. The steakhouse is packed!

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    Click here to enlarge Originally Posted by Eleventeen Click here to enlarge
    I got the hot parts back from coating. I'm currently working on reassembling everything and hope to have it up and running next weekend.
    Looks great man

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    Sweet work! I see you didn't coat the o2 tubes, was gonna recommend that haha. If it works, awesome! I am concerned with the high exhaust velocity at high rpm and the sharp turn it will have to make, but you don't need much you just need enough quickly for a measurement. The idea is solid though and gives me some ideas too! Excellent work!

    I would love to learn tig, I only know mig and my welds aren't always artful lol. But no breaks!

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    Click here to enlarge Originally Posted by V8Bait Click here to enlarge
    Sweet work! I see you didn't coat the o2 tubes, was gonna recommend that haha. If it works, awesome! I am concerned with the high exhaust velocity at high rpm and the sharp turn it will have to make, but you don't need much you just need enough quickly for a measurement. The idea is solid though and gives me some ideas too! Excellent work!

    I would love to learn tig, I only know mig and my welds aren't always artful lol. But no breaks!
    Thanks! Yeah, should only need a small sample of gases for the widebands to do their thing. Since exhaust travels in pulses, there should be a pushing and sucking effect (insert joke here) on flow through the tubes. That should prevent residual readings on any stagnant gases. That's the hope, anyway...

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