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  • Sticky's Avatar
    Today, 12:07 PM
    This tutorial on how to pull off a swap many of you have talked about comes from Gelashvili Performance in Tbilisi, Georgia. Keep that in mind when reading about it and some of the spelling/grammatical errors you will encounter. The 6HP28 is from the 335d and obviously can handle much more torque than the 6HP21. A recent 335d hit 903 lb-ft of torque to the wheels for example. Enjoy the details below in Gelashvili Performance's own words: N54 335 Transmission Upgrade! Switching from weak 6HP21 to stron 6HP28 I'd Like to share this info for english speaker followers here, i think it will be useful for N54 Enthusiastics who love DIY stuff and non ordinary approaches for improving car performance. anyways: everything started from E90 335i AT (2007 model) that i bought for my Wife on 2019 new year. it was absolutely stock when i got it for her. i have had tuned a lot of N54s previously but never had personal one so i was very excited to modify it and push it as far as possible with help of my team member Levan Gabelia. we did everything on our own and custom, such as: double stock intercooler 3" piping Tial bov custom 3" downpipes dual 2.75 exhaust with dual cutouts at diff area custom exhaust muffler E60 M5 Diff 3.64:1 Single Walbro 450 intank PCV valve mod. N55 Ignition Coils 1 Step colder spark plugs gapped to 0.5mm water/meth injection before and after cooler. relocated intakes on passenger side with chinese air filters :confused2 upgraded wastegates and adjusted actuators to sit tighter same time i bought billet compressor wheel 39mm but have not installed it YET as i wanted to push and see stock turbo limits what it was capable of and see 100-200 times. so i left billet wheel on the shelf. custom tuned car to 22psi and flashed with MHD Flash tool ran 100 octane fuel with 15% ethanol in tank stock 6HP21 AT Trans w(235000km on it) XHP Stage 4 Flash with my custom torque adjustments car ran 7.41 100-200km/h but transmission used to slipp badly past 200km/h in 5th gear once AT Fluid would warm up. i was able to do few 80-250km/h runs (maybe 2-3) and then it would start to slipp badly. long story short, it was time to think about upgrade. clutch pack upgrade was pretty costy especially when it comes to shipping, import taxes etc (i'm far from USA) and overall there was no warranty that trans would hold abuse and would operate smooth and just like stock. so i did my own research over internet and thought why not give a try to 6HP28 from E90 335D. some "experts" said not all holes line up BUT! if u do some grinding and enlarge bolt mount holes trans will bolt on without issues. as well as torque converter. i found Taron's thread where we said that for 6HP28 you will need: i was like... hmmm so much work and someboyd said u just need to enlarge holes and it lines up... so i went and found trans from 2011 335D which had same shifter mechanism and i didnt need any other shifter than what i already had. - i was like.. hmm task list got shorter now.. when we removed stock transmission and tried to fit Diesel one on engine.. figured out that: 1) 6HP21 Torque converter (TC) has 6 bolts and 6hp28 has 4 2) 6HP21 has smaller diameter TC than 6HP28 well good news was that input shaft and splines were same so torque coverters turned out to be interchangable so we quickly "solved" this issue by deciding leave 6HP21 TC on 28 Trans. 3) none of the mounting bolts of 6HP28 lined up to block. 4) thought about enlarging them but turned out only top two bolts can be mounted but none of rest because Transmission bellhousing is wider itself and does not line up at all . 5) even if we managed and mounted transmission somehow another issue was that transmission sump was angled... it could not stand straight when mounting top two bolts. so i was like WTF... who said you need to enlarge bolts and it lines up? it was an interesting challenge... decided to cut both transmissions and weld to each other. so this is what we did: cut both 21 & 28 front side of bellhousing and decided to weld 21 front side to 28 rear end. when we lined them up.. turned out that 21 is a bit smaller diameter than 28 so was torque converters. as long as i went for such hardcore direction, i decided to use 6HP28 Torque converter as well as i was told that it is stronger than 21:confused2 took measurements of N54 flywheel and figured out there was room to CNC drill holes for new mounting points :happyanim: after 5 days of measurements, cuts, welds, machining and F***ing with transmission we did it... got damaged engine block, crankshaft, machined guide from crank to trans to line it up and fit straight. measured length of both transmission and everything was fit within 1mm clerance. lined up transmission sump to engine sump so they were on same level and not angled. outcome and look was not shiny and perfect but as long as it works i dont give a **** what others will say or think. if somebody want shiny parts on a car be ready to pay few thousand dollars for shiny adapter plates. from beginning of project after 1 week transmission was ready to mount and check rest things such as mechatronic, cooling lines, etc. modified flywheel bolted to the engine 6HP28 torque converter bolted to it perfectly. transmission mout process was real b**ch because tools brely fit with bolts. there was no room to put hand and tight bolts so mounting took very long. once mounting was finished it was time to check mechatronic and compare 6HP28 to 6HP21 i thought they would be interchangable and i would just swap TCUs so there would be no programming issues. they looked very very similar - BUT turned out they are different and not interchangable sensor height was main difference so we assembled trans back. also compared 6HP21 and 6HP28 sump / filter to each other to see if they are interchangable - they are different as well. once everything was ready, trans was filled with new oil, started engine and oil came out from trans cooler pipes mounting pint. we have not paid attention and it turned out that 6HP28 uses larger diameter pipes :( so test drive was postponed for a while.. i could not find OEM cooler pipes so had to think what to do :suicide: but it didnt took me long... i drew adapter for 6HP28 to accept 6HP21 cooler lines without leakage and modification. took me few hours to machine them with appropreate size washers to fit pipe holding bracket properly and not angled. anyways, instllation of cooling pipes with adapters and oring was easy as 1 2 3 filled completely with new oil and took car for a test drive. first impression was - no kicks and no strange behaviour. no vibrations car runs smooth and nice... it was really great. BUT! now it was time to do some programming as diesel does not rev past 5k :) read stock flash, checked maps.. but i thought istead of wasting time on research and investigation id pay to XHP to make custom flash for my trans and let them do all that stuff. took about 2 week back and forth communication with Clemens from XHP to develop flash for my Transmission which is still under investigation and development. he did many revisions as it is something that u will not see in everyday live and big shout to him for that! so far car runs perfectly fine as cruise, or moderate load or full load. we are still in development and testing process, flash is not 100% complete yet but i love how car runs and holds power without slippage. meanwhile when car was apart i did not waste time and prepared turbochargers with billet 39mm compressor wheel and 9 blade turbine wheels. now it is time to tune and check what car will be capable of on new trans and compressor wheels. i'll be posting more info on my IG: Geptuned and facebook: Gelashvili Performance i thought i would share this info for somebody struggling like me and find useful for future. i'll be uploading pictures whatever i have taken from trans upgrade process feel free to ask questions
    0 replies | 48 view(s)
  • Torgus's Avatar
    Today, 11:41 AM
    https://www.chicagotribune.com/news/criminal-justice/ct-jussie-smollett-special-prosecutor-ruling-20190622-qzz75rrr5zh7znqcseqyojnbam-story.html Hah that judge is PISSED! It also raised the specter that Smollett could be charged all over again. In issuing his 21-page opinion, Toomin couldn’t resist a personal dig at Smollett’s acting chops as he made it quite clear he believes the police account of what happened early on the morning of Jan. 29 near the actor’s apartment building in the Streeterville neighborhood. “In perhaps the most prominent display of his acting potential, Smollett conceived a fantasy that propelled him from the role of a sympathetic victim of a vicious homophobic attack to that of a charlatan who fomented a hoax the equal of any twisted television intrigue,” Toomin wrote. Toomin concluded his ruling by writing that the case’s “unprecedented irregularities” warranted the appointment of a special prosecutor “to restore the public’s confidence in the integrity of our criminal justice system." The next step for Toomin will be to decide who should be the special prosecutor. That choice will bring on a team of attorneys to assist in the probe. They will wield extensive power to follow the probe where it leads, including investigating “the actions of any person or office involved in all aspects of the case,” Toomin’s ruling noted. They could also file new charges against Smollett — or anyone else they reasonably believe committed a crime.
    5373 replies | 1589560 view(s)
  • AdminTeam's Avatar
    Today, 09:52 AM
    swagsteezy, we appreciate you taking the time to join.
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    Today, 07:44 AM
    Welcome to a real enthusiast forum calle_kjellberg.
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    Today, 07:36 AM
    Welcome chrisseiner, take a look around, I think you will like what you see.
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  • markshiplay's Avatar
    Today, 07:20 AM
    Welcome Alama, :)
    1 replies | 25 view(s)
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    Today, 07:18 AM
    Welcome Steambao, hope we exchange worthy information here.
    1 replies | 24 view(s)
  • markshiplay's Avatar
    Today, 07:17 AM
    Welcome to the forum.
    1 replies | 22 view(s)
  • markshiplay's Avatar
    Today, 07:16 AM
    Oh Wow, Looks its a Nice kit, but Wort trying. :)
    12 replies | 21624 view(s)
  • markshiplay's Avatar
    Today, 07:14 AM
    I guest this is a Good Initiative to stop Air and environmental pollution. BTW i didnt knew that.
    4 replies | 585 view(s)
  • AdminTeam's Avatar
    Today, 04:45 AM
    Welcome suni_335, take a look around, I think you will like what you see.
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    Today, 03:55 AM
    Steambao, we appreciate you taking the time to join.
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  • AdminTeam's Avatar
    Today, 03:11 AM
    Hey richardstroker: :text-welcomewave:
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    Today, 02:12 AM
    Sarkhan39, we appreciate you taking the time to join.
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    Today, 12:27 AM
    Welcome to a real enthusiast forum Lcalzadilla.
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    Yesterday, 10:07 PM
    Welcome LUNEYTUNED, take a look around, I think you will like what you see.
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    Yesterday, 09:44 PM
    Welcome Cwlo, take a look around, I think you will like what you see.
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