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Thread: My 1995 M3 GT nr:111 Twin Turbo

              
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    My 1995 M3 GT nr:111 Twin Turbo

    Click here to enlarge

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    Hi guys,

    This is my 1995 BMW M3 GT nr 111 from 350 made. I have done some modifications to the cars since buying it in February 2007.

    Engine:
    S50B30 GT version (different cams and better oil pan design)
    Forged internals: Pistons are from CP 8.5:1 compression. Rods are also forged with ARP bolts
    Ceramic coated main and rod bearings, OEM head gasket and ARP2000 studs
    Head has some porting/polishing done, new copper valve guides
    Custom made tubular exhaust manifilds, ceramic coating
    2x GT2252 internal wastegate and air/air intercooler
    Original airbox (plenium) modified for FI
    Walbro 255 (intank) RC 750cc injectors and adjustable FPR
    OEM Bosch ECU originally tuned for FI with Moristech Piggybak on top
    Gizzmo boostcontroler, Zeitronix Wideband monitor and Knock Link (knock detector)
    Supersprint De-Cat and Scorpion end box.
    Sachs multipuck clutch and JBRacing lightweight flywheel
    3.15 / 2.93 / 2.65 LSD's

    Suspention:
    Powerflex bushes
    H&R coilovers + H&R adjustable swaybars
    Intrax adjustable camber/caster plates
    OEM X-Brace and Strut Brace

    Brakes:
    Front 370x38mm Ceramic Disks + 8piston Calipers (brembo) with Yellowstuff
    rear stock size E46M3 Zimmermann drilled disk with Ferodo Racing Pads
    Steel braded brake lines + Super blue Racing fluid

    Interior:
    Heigo halfcage + Schroth 4point harness
    Recaro Pole Position seats
    Momo Corse wheel
    Half stripped interior

    Wheels/Tires
    4x8.5x18" BBS RC in white + 4x8.5x18 BBS CH in silver
    4x 225/40-18 for winter, 225/40+245/35 for summer/ 235/30+265/35 for the track

    Car was making 470hp/560nm at 12psi when I had it measured in 2009. Now it runs daily 14psi. Soon to be tuned at 22psi.
    1995 BMW M3GT nr:111/350 TwinTurbo and some other mods.

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    Nice ride, any engine pics or videos? Dyno sheet? Thanks!
    JB4LIFE

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    Very nice!

    We need pics of the engine bay!
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    I aim to please. In this album there are many pictures, from when I bought the car, the evolution to the current state including the engine rebuild.

    I'll do a short recap:

    When I bought it (Feb 2007) not qute original...
    Click here to enlarge

    Fist session of Upgrades was regarding brakes and suspention. The Ceramic Brembos from the McLaren SLR along with a set of H&R coilovers and sway bars + powerflex bushes. To be able to fit the brakes I had to go with 18" wheels, so I bought a set of BBS CH 8.5x18" on all four corners.
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    I then fitted a set of Toyo R888 semislicks but that forced me to reconsider the seats, so I went for a set of Carbon Fiber version of the Porsche GT3 Aliens.

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    I craved some more power and sourced a twin turbo kit made by DA-Motorsport in Turkey which a friend had bought but never installed. Needless to say I had to do some slight modifications to the kit. It was installed later.

    Click here to enlarge

    I also bought a set of BBC CH (forged) much lighter than the CH.
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    Next up were the adjustable camber plates, along with Powerflex for the front trailing arms
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    And the Scoprion end can.
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    I also added the Front Splitter (adjustable GT splitter) that was missing when I bought the car.
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    Click here to enlarge

    This was kind of the end of this chapter. Next up were the power updates...
    1995 BMW M3GT nr:111/350 TwinTurbo and some other mods.

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    Early 2008 I started with the install of the Twin Turbo system on stock internals. As I said the system was not a perfect design, but it was designed to run at 8psi, i ran it at 11psi. The exhaust manifolds were terrible, and made a strange engine sound, but they did the job for the time beeing.

    Click here to enlarge

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    I was using 440cc injectors and I flew in a expert tuner to tune the original BOSCH DME. The car drove reliable but soon I started to see pressure in the coolant so I upgraded to a MLS 0.140 plus ARP's.

    0-200 run on this setup




    There was still room for improvement.. and actually the engine (piston rings) were starting to show some wear.. so... why not do a fully built bottom end. Engine went out..


    Click here to enlargeI

    bought a set of CP Pistons (8.5:1), some custom made Forged connecting rods, the Walbro 255 and NGK-R 2525-9 plugs. I also got a set of VAC main and rod bearings (coated) and ARP's for the rods.
    Click here to enlarge

    I also got in contact with a tuner in Sweden where I bought the rods and he had his friend make me a set of Tubular exhaust manifolds.
    Click here to enlarge

    Somewhere in between I had also bought a SuperSprint De-cat midsection and the OEM X-Brace for the frunt suspention from the Cabrio.
    1995 BMW M3GT nr:111/350 TwinTurbo and some other mods.

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    The rebuild..

    Block with pistons, rods and bearings installed, mirror surface on the block ready for the stock thickness MLS.

    Click here to enlarge
    Head re-mashined, some porting and plolishing along with new copper valve guides.

    Click here to enlarge
    The JBRacing lightweight flywheel installed. I did not have the block painted or any of the parts specially cleaned. My car is for driving so it does not really bother me.

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    Engine almost done. Canio (my Italian mechanic) and my Tuner (also a pretty good engineer/mechanic) working on the engine.

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    Almost done.. This airbox would later explode on the welds..

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    Exploded intake manifold... gread build quality.

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    So I did like the guys in Sweden do. I modified the OEM intake for Turbo. Much better quality.

    Click here to enlarge
    The car was tuned with the old airbox. It made 470hp/560nm at Mantehy Racing in Nurburgring. Manthey is one of the best Porsche racing specialists around. The dyno was made using the old airbox.

    Click here to enlarge


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    The car was running 12psi, there were some problems with boost leakage after I installed the OEM airbox, forgot to put the O-rings on the runners... Click here to enlarge Still, I went to SPA Francorchamps in May 2009 where the car performed well, lapping a 2:50 which is respectable for a road car. I also had installed a S2.65 differential from a 325TDS and that made the gears very tall. Potential top speed of 340km/h doing 280 in 4th. Surely not optimal for track driving... Still, I had some CSL for Lunch. (min 2:40)

    http://www.youtube.com/user/farturinn#p/u/3/LMVKM0OUnP0
    Last edited by M3GTtt; 12-31-2010 at 06:18 AM.
    1995 BMW M3GT nr:111/350 TwinTurbo and some other mods.

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    In the lates rebuild I had installed a Gizzmo electronic boostcontroler... that made me a bit greedy so I started pushing up the boost. Going up to 22psi. The AFR's looked ok, and so did the EGT, but something went wrong. The coolant started to pressurise in summer of 2010 so the only option was to rebuild the engine again. This time around I decided to do all the work myself. Keep in mind that I have no mechanical training or experience. I work in Private Banking..
    When the engine came apart it was quite obvious that the headgasket was blown... quite badly actually for an MLS. I along with some of my friends started speculating what had gone wrong. Most likely it was due to detonation, which resulted in me beeing to agressive on the boost and the car probably running out fo fuel at the top end since the injectors were only 440cc. Still I was running almost 4.5Bar of fuel pressure.

    HG badness...


    Click here to enlargeThis time around I decided to go with a STOCK HeadGasket from BMW and I also upgraded to ARP2000 bolts.

    Head off and pistons cleaned Click here to enlarge
    Click here to enlarge

    It was a strugle to get the head on since I was doing the job alone, I bought an engine crane and that helped. Head on.
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    I also put some thermal insulation on the engine bay.
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    I also thermal wrapped the downpipes.
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    Since I had no previous experience the timing of the cams and valve adjustments were a pain in the neck. But I managed.
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    Almost done.. again
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    The RC750 injectors went in along with the Moristech Piggyback (installed it myself) and the Knock link Knock detector.
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    The car started up ! I was pretty happy. Drove it for 3 days and then no boost, and a terrible sound coming from the turbo area. I inspected the engine, found a busted hose from the airbox to the ICV and also I had made a small mistake when installing the Airbox. I had actually managed to clamp the oil feed line to one of the turbos which resulted in oil starvation to it and it was gone....
    http://www.youtube.com/user/farturinn#p/u/0/H612rlMcn0c

    Pretty depressing, since its not that easy to access a bottom mount twin turbo system. Still, I bought two new GT2252's and re-designed the oil feed system. Intstalled and I had power again.

    Oil feed re-designed
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    Two new Garrett's
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    Today the car runs great, power is plenty at 14psi (minimum PSI) and the plan is to get the car to the UK for some tuning. The goal is maximum PSI that the piggyback can handle using the internal boost sensor which is 22Psi. That should be good for 600+ HP. I also installed a new water pump, fan-clutch, oil catch can, Denso Iridium plugs, painted the RC's white, and am currently installing a 2.93 Differential which will get the LSD unit from the S2.65.



    Other mods I have done/am doing include the seats which I changed to Recaro Pole Position with some custom stiching

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    Car on winter tires on the white RC's
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    Engine bay, looking OEM as I want it to look. No fancy stuff showing.
    Click here to enlarge

    Its been a labour of love and some hate, frustration and enjoyment but it has cost me alot of money. But today I am happy with the car. I have something a bit special, its fast and reliable and I have rebuilt the engine (top end) myself so that gives me more pleasure when I drive it.

    There seems to be a problem with hotlinking pictures from my album, so here are some shortcuts.
    http://myndasafn.bmwkraftur.is/v/med...fart/Rebuild2/
    http://myndasafn.bmwkraftur.is/v/med...fart/overhaul/
    http://myndasafn.bmwkraftur.is/v/medlimir/fart/GTnew/
    http://myndasafn.bmwkraftur.is/v/medlimir/fart/GT_2/
    http://myndasafn.bmwkraftur.is/v/medlimir/fart/GT+new/
    http://myndasafn.bmwkraftur.is/v/medlimir/fart/GT/
    Last edited by M3GTtt; 12-31-2010 at 06:36 AM.
    1995 BMW M3GT nr:111/350 TwinTurbo and some other mods.

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    Epic build. Thanks for all the pics and info
    Click here to enlarge

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    Epic build! Some of the pictures are not loading for some reason.

    Whoever put those turbos there and designed that manifold is very talented.
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    1 out of 1 members liked this post. Reputation: Yes | No
    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    This quote is hidden because you are ignoring this member. Show Quote
    Epic build! Some of the pictures are not loading for some reason.

    Whoever put those turbos there and designed that manifold is very talented.


    Strange regarding the pictures.. I have gone through them over and over again to fix and somehow they will not work.

    Regarding the manifolds, what I did was take the "cans" that I got with the original kit, sent them up to Sweden and the fabricator made the tubular ones from a jig he made using the cans. So they were 100% the same fitment as before. Therefore I could use the downpipes again and nothing had to be changed.
    1995 BMW M3GT nr:111/350 TwinTurbo and some other mods.

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    Click here to enlarge Originally Posted by M3GTtt Click here to enlarge
    This quote is hidden because you are ignoring this member. Show Quote
    Strange regarding the pictures.. I have gone through them over and over again to fix and somehow they will not work.

    Regarding the manifolds, what I did was take the "cans" that I got with the original kit, sent them up to Sweden and the fabricator made the tubular ones from a jig he made using the cans. So they were 100% the same fitment as before. Therefore I could use the downpipes again and nothing had to be changed.
    Sorry, I don't know why only some of them will work.

    You can always upload them here as well but that might be a hassle. I'll see what is going on.
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    This one is now being rebuilt, with a new set of CP pistons and VEMS standalone. Watch this space... Click here to enlarge
    1995 BMW M3GT nr:111/350 TwinTurbo and some other mods.

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    Cool, beautiful car you got man.

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    Mert his welding skills seem to suck big time on that manifoldClick here to enlarge

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    awesome build. rare car too! cant wait for the rest of the pictures to load up. look forward to more!
    Click here to enlarge
    2007 335i Coupe
    Mods: Check the Garage

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    So you're sticking with Gunni's tuning? Why?

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    Click here to enlarge Originally Posted by black bnr32 Click here to enlarge
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    So you're sticking with Gunni's tuning? Why?
    He wants to make it up to me, we are friends so we decided to do a joint effort. Maybe i will ask Mr.X to run through the tune once done
    1995 BMW M3GT nr:111/350 TwinTurbo and some other mods.

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    This M is sick! Mad props. Click here to enlarge
    Click here to enlarge Originally Posted by Twinturbom3 Click here to enlarge
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    Keep on jealousing.

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    Very nice car, so I take it you are using vems?
    Click here to enlargeClick here to enlarge

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    I will be using VEMS this time around.

    But some news.. Engine build has started!

    Click here to enlarge
    Click here to enlarge
    Comparison of the 2008 Forged CP 8.5:1 pistons and the 2011 version of the same producst
    Click here to enlarge
    Oil squirters marked from 1-6
    Click here to enlarge
    Crankshaft is in
    Click here to enlarge
    Rings gaped and pistons ready for install, just waiting for some new rod bearings
    Click here to enlarge
    1995 BMW M3GT nr:111/350 TwinTurbo and some other mods.

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    Click here to enlarge Originally Posted by M3GTtt Click here to enlarge
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    I will be using VEMS this time around.

    But some news.. Engine build has started!

    http://www.bimmerboost.com/images/im...92011157-1.jpg
    http://www.bimmerboost.com/images/im...92011158-1.jpg
    Comparison of the 2008 Forged CP 8.5:1 pistons and the 2011 version of the same producst
    http://www.bimmerboost.com/images/im...92011159-1.jpg
    Oil squirters marked from 1-6
    http://www.bimmerboost.com/images/im...92011160-1.jpg
    Crankshaft is in
    http://www.bimmerboost.com/images/im...92011161-1.jpg
    Rings gaped and pistons ready for install, just waiting for some new rod bearings
    http://www.bimmerboost.com/images/im...92011162-1.jpg
    Awesome stuff! Who is doing all this work?

    How are the pistons different?

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    2 out of 2 members liked this post. Reputation: Yes | No
    The engine is being rebuilt in Motorwerx Marlow in UK. Gunnar GST is handling the rebuild, and will do the tuning once the engine is in.

    The pistons are very different, hard to see by these pictures but you can see it better here:

    Just to show the difference in design of the 2008 CP and 2011 CP.
    2011
    Click here to enlarge

    2008
    Click here to enlarge

    There is noticable difference in the thickness between the valve reliefs, much thicker on the 2011. Just looks totally different....
    1995 BMW M3GT nr:111/350 TwinTurbo and some other mods.

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    Will you be having the block o-ringed with a an erling head gasket, or mls? Very nice parts.
    Click here to enlargeClick here to enlarge

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    Nope, no O-Rings and not MLS. Stock HG is what I prefer, reson is that I want the HG to be the weak point and not the mechanical stuff.

    Strange thing though.. I did put a Stock HG (bought at BMW) last time with the ARP2000 bolts. Did the torque in about 5 steps. First reaching about 40nm on all in 3 steps, then doing 2x 90 which ended up in a staggering 130nm+! And this meant that the HG was not compremised when the engine blew up.. which was unfortunate.
    1995 BMW M3GT nr:111/350 TwinTurbo and some other mods.

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    Click here to enlarge Originally Posted by M3GTtt Click here to enlarge
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    Nope, no O-Rings and not MLS. Stock HG is what I prefer, reson is that I want the HG to be the weak point and not the mechanical stuff.

    Strange thing though.. I did put a Stock HG (bought at BMW) last time with the ARP2000 bolts. Did the torque in about 5 steps. First reaching about 40nm on all in 3 steps, then doing 2x 90 which ended up in a staggering 130nm+! And this meant that the HG was not compremised when the engine blew up.. which was unfortunate.
    Yea the erling is a stock type gasket. My engine builder used the elring gasket in his US s50 build, and its still holding with the new owner pushing up to 25 psi on pump fuel. I currently have a mls on my built motor no issues. I have run up to 28psi, but not for long periods of time.
    Click here to enlargeClick here to enlarge

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