PROMO VTT E9X N55 Twin Turbo conversion 500-750WHP capable. Starting Under $4000

Nov 5, 2016
596
606
55
Bay Area
Well we decided to change the game again. This time the E9X N55 game (F Series kit is coming!). We as we are sure many people were sick of the paltry upgrade options for the BMW N55 motor. It seemed the N54 got all the good stuff. So our thinking was, why not use the good stuff on the Red headed step child? So we set out to build a conversion kit to use our N54 GC, and GC Lite turbochargers on the N55 motor.
IMG_3141.jpg

It was a difficult task, but once we got it finished, the prototype conversion kit fits great, and is relatively easy to install! Please keep in mind, these are protoype pieces, some Mig welding was used on the down pipe for ease of fabrication, some Tig was used. All production pieces will be 100% tig welded. All lines are either factory style stainless steel hard lines, or AN style.

Once we got the prototype kit finished, and installed. On initial fire up it was pure joy for our ears, as it popped, and crackled even with the burbles off. The dual 3" into 4", back in to dual 3" made some very happy exhaust sounds...:) Next we got the car on the dyno, and Ken from Wedge tuning gave us a starter map. This is the E85 map he currently runs with his PS2, and it makes about 515WHP with that map. We loaded that same map with BUT used his 91OCT boost curve which is about 4 psi less, and car put down a smooth 550WHP/533WTQ at 23-24 psi of boost.
N55_550WHP.jpg


From there we took his original E85 boost curve, and put it back in, the car responded with easy 586WHP/573WTQ before we hit some weird fuel cut.
N55_586_573.jpg

Power was essentially going straight up, with another 1000RPM or so to go, and it would just shut off. We played around with fueling a bit, and it was getting better. A few pulls later same boost, with some fuel tweaks it made 597WHP/578WTQ, and held it a little longer before it hit the cut.
N55_597_578.jpg

Spool was basically insane, on par with a stock N55 turbo, and making 500WTQ at 3200RPM. We were on the right track, and with a few more tweaks we would be well over 600WHP at redline, and could move on to boost, adding a few lbs would surely see close to 650WHP. Alas it was not be, at least not today. The next pull the car shut off around 4500, and it appears we have been struck by the infamous crank hub. Looks like we need to make our Crank Bolt Capture for the N55 after all..:(

So we were stopped there, and the preliminary results are as we hoped, lightening spool, and power still going up at 6000-6200RPM! No fall off, the exhaust note sounds amazing, great fit, and easy installation. We plan on getting more results, once we get this crank hub sorted. We expect 650 on GC Lites, no problem.

So lets get on to the conversion kit itself.

First off. YES this kit requires you drill, and tap the factory location on the block for the rear drain. It is very easy to do, take about 10 minutes once the pan is off, and can be reversed by installing a simple plug. For some people this will be dauting, any qualified shop would have no problem doing this.

We will offer a couple versions, basic conversion kit, and full conversion kit. The basic kit is just the basic parts to get the N55 converted to twin turbos, does not include things such as coolant bottle relocation, charge pipe, BOV, etc. The full conversion kit is most things we used to get the car where it is now, except fueling, the FMIC, tune, tuning devices, etc which are extra. These kits are available on the website for Pre-Order. Please bear in mind, production kits are at least 90 days away. We do not need any pre-orders. We are making the kits regardless, some people like to be first in line, if that is you feel free to place your order. If not feel free to wait until the production kits are finished for immediate shipping.

1. Basic Conversion kit - $1499

IMG_3113.jpg

IMG_3111.jpg

IMG_3126.jpg



  • Billet Stainless Steel Twin Turbo Head adapter plate
  • All lines, hoses required for conversion
  • Downpipe
  • Charge pipe
  • Relocation inlets
  • All hardware, and gaskets required for conversion
  • Dowel, drill, and tap for rear drain
  • Motor Mount Bracket
  • Add GC Lites for $2500, or GC's for $3000
2. Full conversion kit - $2199
  • Billet Stainless Steel Twin Turbo Head adapter plate
  • All lines, hoses required for conversion
  • Downpipe
  • Charge pipe
  • Relocation inlets
  • All hardware, and gaskets required for conversion
  • Dowel, drill, and tap for rear drain
  • Motor Mount Bracket
  • Driver side coolant bottle
  • PS relocation bracket
  • Cold side charge pipe
  • Race port BOV conversion with solenoid, and harness
  • Add GC Lites for $2500, or GC's for $3000
3. Available extras
  • FMIC VRSF 7" Race $750, or AD 650 - $725
  • PFS LPFP's Single or double shot upgrades - Prices vary
  • PFS PI kit - $799
  • VTT Shotgun Single Barrel kit - $799
  • MHD tuning device / cables $ Price Varies
Our test car was equipped with the following:
VTT E9X N55 GC Lite Twin Turbo conversion kit
PFS Double Shot LPFP
EOS Intake manifold with top mount PI
VRSF 7" HD intercooler
VTT N55 BOV conversion kit with Turbosmart Raceport
Spec Stage 2+ pressure plate, and disc, stock flywheel
BMW performance exhaust
BMS OCC
MHD E85 tune from Wedge
100% Stock bottom end
100% Stock head
100% E85 for fuel
 
Last edited:

James135i

Lurker
Nov 7, 2016
24
11
0
Florida
Well we decided to change the game again. This time the E9X N55 game (F Series kit is coming!). We as we are sure many people were sick of the paltry upgrade options for the BMW N55 motor. It seemed the N54 got all the good stuff. So our thinking was, why not use the good stuff on the Red headed step child? So we set out to build a conversion kit to use our N54 GC, and GC Lite turbochargers on the N55 motor.
View attachment 5261
It was a difficult task, but once we got it finished, the prototype conversion kit fits great, and is relatively easy to install! Please keep in mind, these are protoype pieces, some Mig welding was used on the down pipe for ease of fabrication, some Tig was used. All production pieces will be 100% tig welded. All lines are either factory style stainless steel hard lines, or AN style.

Once we got the prototype kit finished, and installed. On initial fire up it was pure joy for our ears, as it popped, and crackled even with the burbles off. The dual 3" into 4", back in to dual 3" made some very happy exhaust sounds...:) Next we got the car on the dyno, and Ken from Wedge tuning gave us a starter map. This is the E85 map he currently runs with his PS2, and it makes about 515WHP with that map. We loaded that same map with BUT used his 91OCT boost curve which is about 4 psi less, and car put down a smooth 550WHP/533WTQ at 23-24 psi of boost.
View attachment 5262

From there we took his original E85 boost curve, and put it back in, the car responded with easy 586WHP/573WTQ before we hit some weird fuel cut.
View attachment 5263
Power was essentially going straight up, with another 1000RPM or so to go, and it would just shut off. We played around with fueling a bit, and it was getting better. A few pulls later same boost, with some fuel tweaks it made 597WHP/578WTQ, and held it a little longer before it hit the cut.
View attachment 5264
Spool was basically insane, on par with a stock N55 turbo, and making 500WTQ at 3200RPM. We were on the right track, and with a few more tweaks we would be well over 600WHP at redline, and could move on to boost, adding a few lbs would surely see close to 650WHP. Alas it was not be, at least not today. The next pull the car shut off around 4500, and it appears we have been struck by the infamous crank hub. Looks like we need to make our Crank Bolt Capture for the N55 after all..:(

So we were stopped there, and the preliminary results are as we hoped, lightening spool, and power still going up at 6000-6200RPM! No fall off, the exhaust note sounds amazing, great fit, and easy installation. We plan on getting more results, once we get this crank hub sorted. We expect 650 on GC Lites, no problem.

So lets get on to the conversion kit itself.

First off. YES this kit requires you drill, and tap the factory location on the block for the rear drain. It is very easy to do, take about 10 minutes once the pan is off, and can be reversed by installing a simple plug. For some people this will be dauting, any qualified shop would have no problem doing this.

We will offer a couple versions, basic conversion kit, and full conversion kit. The basic kit is just the basic parts to get the N55 converted to twin turbos, does not include things such as coolant bottle relocation, charge pipe, BOV, etc. The full conversion kit is most things we used to get the car where it is now, except fueling, the FMIC, tune, tuning devices, etc which are extra. These kits are available on the website for Pre-Order. Please bear in mind, production kits are at least 90 days away. We do not need any pre-orders. We are making the kits regardless, some people like to be first in line, if that is you feel free to place your order. If not feel free to wait until the production kits are finished for immediate shipping.

1. Basic Conversion kit - $1499

View attachment 5265
View attachment 5277

  • Billet Stainless Steel Twin Turbo Head adapter plate
  • All lines, hoses required for conversion
  • Downpipe
  • Charge pipe
  • Relocation inlets
  • All hardware, and gaskets required for conversion
  • Dowel, drill, and tap for rear drain
  • Motor Mount Bracket
  • Add GC Lites for $2500, or GC's for $3000
2. Full conversion kit - $2199
  • Billet Stainless Steel Twin Turbo Head adapter plate
  • All lines, hoses required for conversion
  • Downpipe
  • Charge pipe
  • Relocation inlets
  • All hardware, and gaskets required for conversion
  • Dowel, drill, and tap for rear drain
  • Motor Mount Bracket
  • Driver side coolant bottle
  • PS relocation bracket
  • Cold side charge pipe
  • Race port BOV conversion with solenoid, and harness
  • Add GC Lites for $2500, or GC's for $3000
3. Available extras
  • FMIC VRSF 7" Race $750, or AD 650 - $725
  • PFS LPFP's Single or double shot upgrades - Prices vary
  • PFS PI kit - $799
  • VTT Shotgun Single Barrel kit - $799
  • MHD tuning device / cables $ Price Varies
Our test car was equipped with the following:
VTT E9X N55 GC Lite Twin Turbo conversion kit
PFS Double Shot LPFP
EOS Intake manifold with top mount PI
VRSF 7" HD intercooler
VTT N55 BOV conversion kit with Turbosmart Raceport
Spec Stage 2+ pressure plate, and disc, stock flywheel
BMW performance exhaust
BMS OCC
MHD E85 tune from Wedge
100% Stock bottom end
100% Stock head
100% E85 for fuel
Badass about time better boost options came out for n55!!
 
  • Like
Reactions: [email protected]

Bnks334

Lieutenant
Dec 1, 2016
505
329
0
New York
This is awesome. Looks like much better spool than even ps2, but that could just be tune related. I'd defintely consider this over a single upgrade.

Why no shotgun fueling?
 

[email protected]

Lieutenant
Nov 5, 2016
596
606
55
Bay Area
This is awesome. Looks like much better spool than even ps2, but that could just be tune related. I'd defintely consider this over a single upgrade.

Why no shotgun fueling?
Keep in mind Ken used this EXACT map for his PS2 N55, it made almost 85WHP less, and spooled much slower. When I sent him the 91 Oct street log we did, he was like LOL, you need about 20-30% less WGDC than I do to make the same boost. There really is no comparison, and the best news. To get the performance of a hybrid N55 uprgade run at the edge of its efficiency, you only have to run these a fraction as hard. Its really a game changer for the platform. Now if we can figure out these damn crank hubs!

As for the shotgun, we wanted to run this car on PI, as that is a more popular choice so people can see what it would do without the shotgun
 
Last edited: