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      04-20-2018, 12:56 AM   #1
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Big turbo kits

Hey guys, it seems like nowadays there's a lot of after market big turbo options for the N55 engines. As always, the X1 35i is the neglected child as the car is relatively rare comparing the the 335i.

Just for my curiousity, how different is our car's engine vs a 335xi engine? If a turbo kit has been proven to work on a e series 335xi, can we be certain that it will also fit our cars?
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      04-20-2018, 02:42 PM   #2
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I would think that the only issue may be the strut tower and where the turbo is mounted. I have been trying to decide if I want to have Pure make my PS2 work for the X1 or pickup a Speedtech kit.

The thought of making more power easily or on lower octane is appealing. My pump gas tune on the PS2 is about 390 - 400 whp. I would love to see 450 - 480 whp on pump gas.
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      04-20-2018, 03:05 PM   #3
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Quote:
Originally Posted by Turbod View Post
I would think that the only issue may be the strut tower and where the turbo is mounted. I have been trying to decide if I want to have Pure make my PS2 work for the X1 or pickup a Speedtech kit.

The thought of making more power easily or on lower octane is appealing. My pump gas tune on the PS2 is about 390 - 400 whp. I would love to see 450 - 480 whp on pump gas.
why would PS2 not work on your X1? it worked on mine. I bought my PS2 from N54tuning without core exchange... I think the core was originally from a 335i. Anyways, if you are going with a speedtech kit, are you going with the 7670 or the 8374? Close to 500whp on pump is appealing for sure!

I have been chatting with Jeff@speedtech. He is not familiar with the x1 35i thus he is uncertain if his kit would work...

Jeff's response for my inquiry:

------------------------------------------------------------

Ok I'm not really familiar with the X1 platform, but we have had kits on E82's (135i), E90/92, so if we can figure out commonalities between the platforms, there might be a chance.

Here is more info on the kits:

Options for turbos are: 7064 (up to 550whp), 7670 (up to 650whp), 8374 (up to 750whp), and 9180/9174 (up to 950whp)

E chassis cars can fit up to 7670, beyond that requires custom work for clearance requirements.

Costs for the kits - $3800 plus shipping for the 7064 or 7670, and $4300 plus shipping for the 8374/9180 kit.

Included in the kit:

BorgWarner EFR Turbo
Cast Exhaust Manifold (divided for twin scroll), ceramic coated
Stainless Steel Downpipe
RH Engine Mount
Waterpump Mount Bracket
Coolant Hoses and Billet Fittings
Oil Lines and Billet Fittings
Aluminum Turbo Inlet Tube Fitting/bracket
Silicone Turbo Outlet Tube
Silicone Couplers
Intercooler Billet Adapter
WG Bracket and Linkage Assembly
Required Fasteners and Hose Clamps
V-band Clamp
Full instructions
If you are not familiar with the EFR line of turbos, please take a look at the link below, they are the best available:

http://www.turbos.borgwarner.com/fil...ical_brief.pdf

So when looking at kits, please keep in mind that we are using a $2500 turbo, not a cheapo journal bearing turbo.

Also, if you haven't been to our product page, we have dyno plots and pics here:

https://www.speedtech.com/bmw-n55/

Thanks, and let me know if you think of any other questions on the kits.

---

jeff@speedtech.com
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      04-20-2018, 05:30 PM   #4
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Quote:
Originally Posted by Xdrive35i2014 View Post
why would PS2 not work on your X1?
The 335i and X1 have a different wastegate arm so I cannot pull it off my 335i and move it to the X1. Pure said they would modify it to work on the X1 if I sent it in for a rebuild ($450) I have put 19,000 miles on the turbo so far so I would be opposed to the idea. As for the Speedtech kit fitting, our engine is the same as the late E series 335i. It should bolt and plumb to the engine just fine. The only issue I foresee is the location of the strut tower since it is different on the X1 than the 135 or 335.
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      04-20-2018, 08:54 PM   #5
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Quote:
Originally Posted by Turbod View Post
The 335i and X1 have a different wastegate arm so I cannot pull it off my 335i and move it to the X1. Pure said they would modify it to work on the X1 if I sent it in for a rebuild ($450) I have put 19,000 miles on the turbo so far so I would be opposed to the idea. As for the Speedtech kit fitting, our engine is the same as the late E series 335i. It should bolt and plumb to the engine just fine. The only issue I foresee is the location of the strut tower since it is different on the X1 than the 135 or 335.
It seems like the speedtech stage 3 kit is the much better kit. Same spool but able to produce higher power at lower boost/octane. If i am upgrading now, without a doubt it would be the speedtech.

I recommend u to also send him an inquiry about x1 35i compatibilty for the stahe 3 kit to let him know there is demand.
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      04-21-2018, 07:18 PM   #6
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Quote:
Originally Posted by Xdrive35i2014 View Post
It seems like the speedtech stage 3 kit is the much better kit. Same spool but able to produce higher power at lower boost/octane. If i am upgrading now, without a doubt it would be the speedtech.

I recommend u to also send him an inquiry about x1 35i compatibilty for the stahe 3 kit to let him know there is demand.
I would be looking at an install date a year from now for a stage 3 kit or 6 months from now to swap my PS2.
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      01-07-2022, 03:04 PM   #7
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@Turbod, I hope you're enjoying the X3M! Not sure if you ever check the e84 forum anymore, but if you do...

Turbod and Xdrive35i2014 - looks like you both went with PS2 vs. Speedtech. I was curious if this was because of any known fit issues on the X1 chassis?

Turbod, can you share any details on the differences you've observed between the strut towers of the X1 and 335? That's intersting your x1 turbo had a different WG arm than the 335, I checked realoem for my VIN (2015 year), and 2 turbos are listed, and both cross reference with e9x's and e82's. Did it appear the different wastegate arms could cause interference with the chassis?

From the digging i've done, the X1 has the same wheel base and track width as the e90. The speedtech kit definately fits on the e82, which has a narrower track width than the e90/e84. Not sure what the differences in strut towers are, but I'm hopeful that since the kit fits the narrower e82, it should also fit the X1, despite any strut tower differences? I've also verified through realoem that our motor mounts are the same as e90.

I'm thinking of pulling the trigger on this kit, but that may change if there are known interferences with the X1. In talking with Jeff at Speedtech , it sounds like still nobody has yet tried to see if this kit fits the X1.

Thanks!
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      01-08-2022, 03:03 PM   #8
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I did some digging on realoem around the strut towers. Not sure if i'm reading this right, but it looks like they cross reference to e9x's and e82?
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      01-11-2022, 11:15 AM   #9
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Just thinking through position of the strut towers. The front axle goes through the oil pan on x-drive. I looked up my oil pan on realoem, and the X1 oil pan cross referenes with e90, e91, and e92. So front-to-back, the output shafts are in the same position relative to the engine as the e9x cars. Would this mean the strut towers also have the same front-to-back position relative to the engine as the e9x cars? The shafts have the cv joint, so I guess they could still protrude some forward or aft relative to the e9x, but I'd imagine the engineers would have wanted to keep this orientation pretty consistent for proper operation on the suspension, no?

Any thoughts from anybody on this? From my internet research, I'm not finding anything to suggest differences in strut tower position with X1 compared to e9x. But maybe I'm missing something? I'm barely familiar with what's going on under my own hood, and I've only ever seen internet photos of the e9x engine bays. I'd love to hear some people's thoughts on this.
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      03-16-2022, 11:54 AM   #10
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Just thought I'd bump this.

Anybody out there have/had both an n55 e90 and an X1 that can speak to any potential differences in the engine bays? Specifically in the area where the turbo sits? Please see my prior posts in this thread.
Getting close to dumping a bunch of money for a speedtech kit, would absolutely hate to do that only to discover it doesn't fit...
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      03-24-2022, 10:38 AM   #11
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I keep searching, and am not finding any evidence that this kit shouldn't fit. I haven't found anything related on e84 n55 that doesn't cross reference with e9x/ e82; expansion tank, turbo options, water pump, thermostat, engine coolant lines and pipes, all the preformed coolant lines, vacuum control system for turbo, turbo to intercooler pipe, turbo oil lines, turbo coolant lines, etc., etc. Photos of the turbo area in my car all appear the same as photos I've searched out of e90's and e82's.

I've searched to the point where I'm 99% confident this will fit just as well as it does on the e90 that it was designed for. Is anybody aware of anything different in the turbo area of our cars that differs in some way from the e90 series cars?
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      04-18-2022, 05:20 PM   #12
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Bueller??? Bueller???
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      04-18-2022, 05:25 PM   #13
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Haha, just kidding! More detail in a thread I started on a different forum. If you're interested, google speedtech efr 7670 on e84 X1 and it should be at the top of the list. In short summary, pretty much everything under there seems to be e90. Trying to pull the trigger, I'll keep this updated incase anybody is interested.
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      05-03-2023, 09:41 AM   #14
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Thought I'd give an update. Since my last update, Speedtech discontinued the internally gated EFR based kits, so I missed that boat. They now only provide externally gated kits, but not with any EFR turbos.

However, my continued research has convinced me that if a kit fits an e90 n55 with auto transmission and x-drive, it should also fit the e84 with n55. So I pulled the trigger on one of their externally gated kits, sans turbo. The complicating factor is I'm planning on combining this with an EFR 8374 that I'll buy seperately. The EFR is longer axially than the turbo offerings they've designed the kit around. So I'll likely have to do some customization for fitment, and a few other things I'd like to change around. But I'm excited for the project, and the prospect of an EFR 8374 on this thing!

I'll let you guys know how it turns out. Wish me luck as I enter uncharted territory for the e84!
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      05-04-2023, 10:46 AM   #15
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Quote:
Originally Posted by wheela View Post
Thought I'd give an update. Since my last update, Speedtech discontinued the internally gated EFR based kits, so I missed that boat. They now only provide externally gated kits, but not with any EFR turbos.

However, my continued research has convinced me that if a kit fits an e90 n55 with auto transmission and x-drive, it should also fit the e84 with n55. So I pulled the trigger on one of their externally gated kits, sans turbo. The complicating factor is I'm planning on combining this with an EFR 8374 that I'll buy seperately. The EFR is longer axially than the turbo offerings they've designed the kit around. So I'll likely have to do some customization for fitment, and a few other things I'd like to change around. But I'm excited for the project, and the prospect of an EFR 8374 on this thing!

I'll let you guys know how it turns out. Wish me luck as I enter uncharted territory for the e84!

Please update us along the way and take detailed notes and pics during the swap!
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      05-07-2023, 08:45 AM   #16
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Please update us along the way and take detailed notes and pics during the swap!
Absolutely!!
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      05-19-2023, 08:04 AM   #17
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I'm very interested to see how this works out! I know this chassis is very similar to the 335, just need to do some more reading as far as parts interchange and commonality.
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      05-19-2023, 08:29 AM   #18
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I'm very interested to see how this works out! I know this chassis is very similar to the 335, just need to do some more reading as far as parts interchange and commonality.
Yes, extremely similar! I've spent a ton of time on realoem cross referencing - the e84 subframe p/n doesn't cross-reference to e9x, however the engine mounts, engine mount brackets, subframe support plate, subframe heat shield, front suspension components, oil pan, front drive shaft & differential, frame rails, wheel housings, downpipe, turbo, water pump/thermostat, engine & turbo coolant hoses/pipes, turbo oil lines, ac components, turbo inlet, air duct/intake components, radiator & radiator hoses, expansion tank, ac components, all cross-reference to e9x. The only apparent differences are the front axles and wheel carriers are e84-specific and do not cross-reference to e9x. As far as axles go, ours have a different interlock design to mate with the wheel hub - I read somewhere they updated it to improve manufacturability on the assembly line. Also, the wheel carriers are different - I've read because that's how they gave e84 greater ground clearance than e90.

As mentioned the subframe is a different P/N, but they look identical so I'm not sure what's different, perhaps the suspension mounts are lower to support our higher ground clearance?

Here's some subframe pics I dug up:
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Last edited by wheela; 05-19-2023 at 08:35 AM..
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      05-19-2023, 08:50 AM   #19
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Picked up a cheap ebay n55 block and head for mocking up kit fitment around the water pump with the longer EFR turbo. Also I plan on adapting the kit to mate up to the oem air duct vs. the filter the kit comes with. I plan on working those details out on the mock-up block before tearing into my car.
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      05-19-2023, 09:25 AM   #20
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Here's a screenshot of what one of the f30 n55 guys made with an EFR 8374 on different fuels. His was internally gated (0.92 A/R) whereas I'm getting external gated version with 1.05 A/R, so that will provide a bit more power at the top end at the expense of not spooling at quite as low of rpm. I picked up a Dorch stage 2 (not installed yet) and plan on sticking with 93oct only, so it looks like the 500whp ballpark should be attainable with thus build.
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      05-19-2023, 07:32 PM   #21
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Quote:
Originally Posted by wheela View Post
Yes, extremely similar! I've spent a ton of time on realoem cross referencing - the e84 subframe p/n doesn't cross-reference to e9x, however the engine mounts, engine mount brackets, subframe support plate, subframe heat shield, front suspension components, oil pan, front drive shaft & differential, frame rails, wheel housings, downpipe, turbo, water pump/thermostat, engine & turbo coolant hoses/pipes, turbo oil lines, ac components, turbo inlet, air duct/intake components, radiator & radiator hoses, expansion tank, ac components, all cross-reference to e9x. The only apparent differences are the front axles and wheel carriers are e84-specific and do not cross-reference to e9x. As far as axles go, ours have a different interlock design to mate with the wheel hub - I read somewhere they updated it to improve manufacturability on the assembly line. Also, the wheel carriers are different - I've read because that's how they gave e84 greater ground clearance than e90.

As mentioned the subframe is a different P/N, but they look identical so I'm not sure what's different, perhaps the suspension mounts are lower to support our higher ground clearance?

Here's some subframe pics I dug up:
This is brilliant, I appreciate all of the leg work you've done! I tell people it's basically a 335 wagon, but with a little more headroom haha
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      05-28-2023, 08:59 AM   #22
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Here's some kit pics! The turbo's on back order, no eta yet.
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