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    • Vishnu Tuning sets a new N54 horsepower record with a dyno of 626 wheel provided by the Vishnu single turbo setup

      The N54 had been stuck in a bit of a rut. There were upgraded turbo options out there but these were relegated to small twins often utilizing the stock housing. A large single turbo simply was necessary to take it to the next level. All the previous attempts at large single turbos had been abandoned. Vishnu showed it is in fact possible and at 22.5 PSI with 94 octane fuel and meth broke the 600 wheel horsepower barrier with a very impressive run hitting 626 although the graph was uncorrected.

      How much further can the Vishnu single turbo kit go? Well, the single turbo is being run on the stock MAP sensor so 22.5 psi appears to be the current limit. Once this is bypassed it will be interesting to see how much further the fuel system and turbo can go. Congratulations for a major development for the platform and for it to finally get the push forward it was needing and deserving. We expect Horsepower Freaks to have a very similar offering based on this same Vishnu tuning solution.

      Video of the car in action below.



      This article was originally published in forum thread: Vishnu Tuning sets a new N54 horsepower record with a dyno of 626 wheel provided by the Vishnu single turbo setup started by Sticky View original post
      Comments 68 Comments
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by MSIZZLE Click here to enlarge
        how could the n54 have more potention that the s65 with less displacement and less cylinders?? The s65 may have more challenges to get where it needs to go but once those barriers are broken a balls out s65 should be more powerfull than a balls out n54 right??
        It already is and has been more powerful for some time. It isn't even a discussion, the S65 has far, far more potential.
      1. LostMarine's Avatar
        LostMarine -
        Click here to enlarge Originally Posted by MSIZZLE Click here to enlarge
        how could the n54 have more potention that the s65 with less displacement and less cylinders?? The s65 may have more challenges to get where it needs to go but once those barriers are broken a balls out s65 should be more powerfull than a balls out n54 right??
        same as any other 6 cyl that was designed for boost. This is the step the N54 guys have been talking about for years now. The large wall has been breached and now its just time to get through it unscathed.

        so, to recap a l little,
        stock motor N54 with BT hits 500 ish on straight pumpgas
        s65 hits 550 ish on pumpgas
        N54 hits 620ish on pump/meth
        S65 hits upper 580-600 on pump/meth
        n54- no built motors/race fuel #s yet
        S65 built motors low to mid 6xx's

        I do not see how the S65 is the greater motor
      1. bobS's Avatar
        bobS -
        This n54 that shiv has tuned is only the beginning, he has already said there will be more power on straight pump and pump/meth once he has more time to tune, possibly change turbos, etc.
      1. bobS's Avatar
        bobS -
        Its great for the bmw tuning scene IMO. Think of how many used, unmolested/untuned 335's are out there that can be picked up for cheap...no need to build the engine, just put a single turbo on with 600+whp, upgrade your clutch, suspension, LSD, and fbo...you've got a reaaaal fast car that won't break your wallet. A real fun project car.

        I just hope this Vishnu car holds together, eventually we'll see how strong these internals are. His car has over 80k miles on it of hard driving, tuning, and testing ....
      1. LostMarine's Avatar
        LostMarine -
        all true, but, and ill be the one to say it. im not 100% sure shivs car was unmolested when he dropped the motor to fab this up. He does have a history of false or hidden mods, even before the bmw scene, like having false fuel bladders fabbed up and installed on his evo or subi, dont remember which, so he could claim pumpgas when its really racefuel. yes, i know, its a stretch, but its an open forum and i can air my own thoughts here
      1. bobS's Avatar
        bobS -
        The fact that he's already installing two kits on people's cars makes you think otherwise, plus it would be political suicide to not divulge the truth up front....time will tell
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by LostMarine Click here to enlarge
        S65 built motors low to mid 6xx's
        No no no, 700's+ on low boost.

        The ESS stuff is embarrassing for built motors, ignore it.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by LostMarine Click here to enlarge
        like having false fuel bladders fabbed up and installed on his evo or subi, dont remember which, so he could claim pumpgas when its really racefuel.
        Never heard of that but if true absolutely absurd. How could anyone trust the guy after that?
      1. LostMarine's Avatar
        LostMarine -
        Click here to enlarge Originally Posted by bobS Click here to enlarge
        The fact that he's already installing two kits on people's cars makes you think otherwise, plus it would be political suicide to not divulge the truth up front....time will tell
        good point, i guess we will just see.
      1. carcars's Avatar
        carcars -
        the n54 is a marvel with its biturbo, this caris no longer a n54 is a N55 with a bigger turbo

        I just hope that alguiem cosiga get moreperformance for turbo rb and we can also seethe 600whp
      1. fastgti69's Avatar
        fastgti69 -
        That is one awesome motor to say the least. You guy's can't really compare a motor that was made for boost from factory to one that was just a high revving NA motor. The n54 is made to hold boost, lots of it. That's how all/most factory boosted engines come, its like insurance for the company that makes the car. They've hit 620 whp on my little 4 banger stock internals, until it blew(not my car, another on Cobalt forums.). I'm sure this n54 can hit 700 whp on stock internals, but that can be a ticking time bomb for sure. Obviously nobody will want to test the limits till it blows on stock internals. Can't wait to see some built motor numbers, cause that will be impressive.
      1. mithiral67's Avatar
        mithiral67 -
        Tried asking in the other theard, but its looks like its been rerailed. sorry for the doubling up.

        There is a +120whp difference between pump and meth, so the meth is making a huge difference. And I understand there are fail safes galore to tell the ECU that meths stopped flowing and kill power. But given the power level that are sustainable on pump vs. gas, how fast would things go to hell if meth did fail at 6500 rpms? Please assume something went wrong and procede didn’t know meth stopped spraying (Like a JB4 fanboy loaded a virus on the procede).

        Would it be instant problems or would the stock ECU get it under control fast enough?
      1. fastgti69's Avatar
        fastgti69 -
        Click here to enlarge Originally Posted by mithiral67 Click here to enlarge
        Tried asking in the other theard, but its looks like its been rerailed. sorry for the doubling up.
        There is a +120whp difference between pump and meth, so the meth is making a huge difference. And I understand there are fail safes galore to tell the ECU that meths stopped flowing and kill power. But given the power level that are sustainable on pump vs. gas, how fast would things go to hell if meth did fail at 6500 rpms? Please assume something went wrong and procede didn’t know meth stopped spraying (Like a JB4 fanboy loaded a virus on the procede).

        Would it be instant problems or would the stock ECU get it under control fast enough?
        Engine could possibly blow, that's for sure. Meth is a scary thing to run, those nozzles get clogged and you don't know about it. You're $#@!ed if you run you car hard if it needs the meth. It's accounting for that much more combustion and air so the injectors are probably putting in lots of fuel thinking it will burn it. I'm probably wrong though..
      1. mithiral67's Avatar
        mithiral67 -
        I mean, in theory you think its really bad, but how many folks are running meth with no issues. Then again, how many have meth failures during WOT and the failsafe fail, with many of them only pushing power 3-7% over just pump. Here the power difference is much more. If I have read enough, the only real known cases of these engines blowing are when folks were running either NOS or meth without failsafes.

        Whats the top end potential for these singles assuming you only used pump?

        Also, whats the exact time delay between the fail safe sensing meth stopping, it telling the piggy to tell the ecu to dropping timing and PSI and for the engine to physically dump pressure? Or does it throw the car into limp mod and its only an electronic response? What exactly does the procede do in these situations?

        I remember seeing logs post of this from the vishnu, but I never take any communications from them at face value, blame the public auditor in me.
      1. LostMarine's Avatar
        LostMarine -
        Have they said what size and % meth they r using?
      1. oddjob2021's Avatar
        oddjob2021 -
        Click here to enlarge Originally Posted by fastgti69 Click here to enlarge
        Engine could possibly blow, that's for sure. Meth is a scary thing to run, those nozzles get clogged and you don't know about it. You're $#@!ed if you run you car hard if it needs the meth. It's accounting for that much more combustion and air so the injectors are probably putting in lots of fuel thinking it will burn it. I'm probably wrong though..
        meth is only 'scary' to run if you're on a tight budget. as long as you have the failsafes in place and a tune that can switch maps on the fly you're golden. if the car is running meth on an aggressive map (timing) and meth flow is suddenly halted, the failsafe tells the tune to switch maps, ie: switch to a less aggressive timing table. afaik both the procede and jb4 do this but i dont know a lot about terry's line. im sure one of the jb guys can clarify.

        Click here to enlarge Originally Posted by mithiral67 Click here to enlarge
        I mean, in theory you think its really bad, but how many folks are running meth with no issues. Then again, how many have meth failures during WOT and the failsafe fail, with many of them only pushing power 3-7% over just pump. Here the power difference is much more. If I have read enough, the only real known cases of these engines blowing are when folks were running either NOS or meth without failsafes.

        Whats the top end potential for these singles assuming you only used pump?

        Also, whats the exact time delay between the fail safe sensing meth stopping, it telling the piggy to tell the ecu to dropping timing and PSI and for the engine to physically dump pressure? Or does it throw the car into limp mod and its only an electronic response? What exactly does the procede do in these situations?

        I remember seeing logs post of this from the vishnu, but I never take any communications from them at face value, blame the public auditor in me.
        exactly, people today run meth nearly without issue. if there is an issue its due to the tune or due to an improper installation. meth has a bad rap because of the evo and wrx/sti guys who ran basic kits for bolt on power without proper failsafes and tuning. some blew some didn't, but because of its inconsistency it was labeled as a killer of motors.

        top end potential atm is unknown. shiv, just like hpf, is planning on having a line of turbos to choose. smaller for earlier torque or larger for more high rev hp. only time will tell what the limit is, knock induced or otherwise.

        your next question depends on a bunch of variables. but my guess is it's within the milisecond range. as for what the procede does in this situation, your first thought is correct, after a malfunction, it tells the piggy to switch maps and drop timing (and with it, boost). a limp would only be triggered under a fault the ecu itself reads, like a boost leak. fwiw, on street races i've done with people following, after a hard pull as soon as i lift off to brake, my friends behind me always say they see flame from my exhaust tips. my guess is this is a little water/meth that was sprayed just as the throttle was closing (delays you're talking about) and travels down the exhaust to produce a small flame.
      1. mithiral67's Avatar
        mithiral67 -
        Yea, at 6k rpms, we are talking about 3 cylinders firing every 20 milliseconds. If the fail safe senses and sends a signal to the piggy the instance meth stops, then the time it takes the last of the meth that was spayed to travel from the charge pipe to the cylinder will be moving slower than the electronic signal. Therefore, the ecu (maybe not the wastegate as it would need to both receive the electronic signal and physically open) would get the signal and adjust timing before even the last of the meth was used. It would all really hang on how fast the failsafe knew meth wasn’t spraying. As long as its quicker than the time it takes for air to travel from the point of meth injection to the cylinder, it would never be an issue.
      1. mithiral67's Avatar
        mithiral67 -
        Even after all that, I personally dont trust runing two sources of fuel/octane "boosters"
      1. fundahl's Avatar
        fundahl -
        Click here to enlarge Originally Posted by mithiral67 Click here to enlarge
        Even after all that, I personally dont trust runing two sources of fuel/octane "boosters"
        It made 505whp on pump so far. If you want to avoid meth you can always buy race gas. MS109 will get you far. It's slightly oxygenated too. Click here to enlarge
      1. mithiral67's Avatar
        mithiral67 -
        oh yea, love the glory numbers, but for practical purpoess, i am excited to see 93 octane numbers.

        Approximately how fast is the air moving through the intake track at full rpms?