Custom Big Single Turbo To Custom Twin (S55) Turbo upgrade
- Thread starter Dumaurier7
- Start date
Good day all! all is not lost! I'll be bringing her back to life!........... stay tuned!Sadly this project has come to an end after an unfortunate accident! After the insurance settlement I've decided to move on, almost all upgraded parts will be up for sale soon, please stay tuned.
The Z is fine! it's the 235 that's comatosed right now.
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So on to the M235! I want to start off saying that it is always important to expect the unexpected, none of us are super human and we all surrender to the same weaknesses. This story started with my complex going down and coming out of production (I am a plant superintendent on a process plant complex) and me working relentlessly to get things sorted and the complex back into production. After achieving my goal I fell asleep coming home after working 7 12 hour night shifts back to back! My beloved paid the price!
If you look closely you’re notice that one frame rail is higher than the other.
The block was smashed by something in the bushes!
This now gives me the excuse to get a new UPGRADED block!
I thought about just doing an s55 block but there are too many unknowns so I’ll do a CSS block with forged pistons and rods.
For the turbo I decided to sell my BW8474 ( sold 2 days after I put the word out!) and do twin s55 turbos, I BLAME this decision on the Z as I’ve grown to love love the power delivery provided by the upgraded twins ….
The N54 twins on the N55, rear turbo fits fine but there are fitment issues with the wastegate at the front….,
This is the s55 gasket on the N55 head, couple new holes to be drilled and tapped for it to bolt up which should be simple with the head off, I chose the S55 because they have more power potential stock, there are ball bearing options available for upgrading to and the electronic WG actuators as my 235 was electronic originally.
If you look closely you’re notice that one frame rail is higher than the other.
The block was smashed by something in the bushes!
This now gives me the excuse to get a new UPGRADED block!
I thought about just doing an s55 block but there are too many unknowns so I’ll do a CSS block with forged pistons and rods.For the turbo I decided to sell my BW8474 ( sold 2 days after I put the word out!) and do twin s55 turbos, I BLAME this decision on the Z as I’ve grown to love love the power delivery provided by the upgraded twins ….
The N54 twins on the N55, rear turbo fits fine but there are fitment issues with the wastegate at the front….,
This is the s55 gasket on the N55 head, couple new holes to be drilled and tapped for it to bolt up which should be simple with the head off, I chose the S55 because they have more power potential stock, there are ball bearing options available for upgrading to and the electronic WG actuators as my 235 was electronic originally.
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Seeing that the F87 M2 comp is an F22 under the skin and the S55 is the motivating force I do not expect any fitment issues with the twins.
I managed to snag these off eBay at a claimed 1500km, depending on how my cash flows I will start up with these then send them to upgrade later or upgrade now, but I am also wanting to upgraded the cams! we'll see how it goes.
I managed to snag these off eBay at a claimed 1500km, depending on how my cash flows I will start up with these then send them to upgrade later or upgrade now, but I am also wanting to upgraded the cams! we'll see how it goes.
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Wow, you DID wrech that thing... I hope your head isn't was broke the wind sheild.
Excited to watch your build progress! Do you have any s55 twins yet for fit up? I wonder how much clearance that water pipe is going to have behind the rear turbo?
Excited to watch your build progress! Do you have any s55 twins yet for fit up? I wonder how much clearance that water pipe is going to have behind the rear turbo?
This is the front end structure, I will be doing a full M2 conversion so I’ll be getting the fenders an front bumper to match.
Yep! Was my head that broke the wind shield
but mamma always said my head was hard ,,, and this all happened in about 200 feet! I didn’t even put my seat belt on.
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Looks like we were typing at the same time - I see some s55 turbos now
quick fingers! I paid $900 for them! They better be worth it!
What are your thoughts on how to integrate in your O2 sensors? Also, can you run both wastegates from the n55 DME?
I remember VTT was working on a twin turbo kit for n55 based on their n54 GC's a while back, but I don't recall any details, or if they ever released anything.
The F22 only has one wide band sensor so I’ll be installing it after I Y both down pipes together. plan for the actuators is to simply splice into the existing wires so both will operate in unison, the DME should not have a clue .
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Yep, I searched and found it , their kit was based on the N54 turbos, but back then I don’t think the S55, which is clearly the better choice, was available.
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How was the response and spool of the BW8474, thinking about swapping my G35-900 (T4 TS) for it. I'm on fullboost at 4000 RPM (24 PSI).
Maybe you can share a log?
