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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > N20 and N26 Turbo Engine / Drivetrain / Exhaust Modifications > Aftermarker Turbo Kit N20 320xi
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      12-15-2015, 11:34 AM   #1
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Aftermarker Turbo Kit N20 320xi

Has anyone gotten an aftermarket Turbo system on there F30 328i or 320i? Ive been looking all day and I can't seem to find anything. Put some links in the comments if you find anything! Thanks Guys.


Currently have a full Borla System on her, Ill post a video on it later.
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      12-15-2015, 12:15 PM   #2
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Originally Posted by Shimmy2408 View Post
Has anyone gotten an aftermarket Turbo system on there F30 328i or 320i? Ive been looking all day and I can't seem to find anything. Put some links in the comments if you find anything! Thanks Guys.


Currently have a full Borla System on her, Ill post a video on it later.
There is a mistubishi turbo swap you could do, think there was a thread a long while ago.
Long story short.

Turbo swaps on N20 engines is a bad idea as it's too much power for the motor to handle, you're going to start blowing pistons and stuff.

The project awhile back had forged pistons and rods replaced for the engine, but I don't remember, google N20 turbo upgrade and there's a thread on it.

Shoulda bought a 335i instead
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      12-15-2015, 01:34 PM   #3
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Quote:
Originally Posted by chaungo View Post
There is a mistubishi turbo swap you could do, think there was a thread a long while ago.
Long story short.

Turbo swaps on N20 engines is a bad idea as it's too much power for the motor to handle, you're going to start blowing pistons and stuff.

The project awhile back had forged pistons and rods replaced for the engine, but I don't remember, google N20 turbo upgrade and there's a thread on it.

Shoulda bought a 335i instead
True haha, but Im working with what I got! Plus it would be a sleeper, but my guess is Ill just get a JB4(around 260hp) and Fuel Flex and push E85. But thanks man, i appreciate it. Go check out @PricelessProductions on Instagram!
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      12-15-2015, 03:28 PM   #4
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Originally Posted by TheePricelessProductions View Post
True haha, but Im working with what I got! Plus it would be a sleeper, but my guess is Ill just get a JB4(around 260hp) and Fuel Flex and push E85. But thanks man, i appreciate it. Go check out @PricelessProductions on Instagram!
Yeah, your best bet (and most safe) is running JB4, you'll push out a bit more power than a 335i, but it'll surprise most people as they won't expect a 320i/328i to be that fast.
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      12-15-2015, 10:44 PM   #5
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Don't bother, motor won't hold. Just go FBO. Also, remove the tow hook. That will add 10hp.
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      12-16-2015, 01:28 AM   #6
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check this, there is also vargas and pure turbo and abr houston can help you in the upgrade
http://www.n54tech.com/forums/showthread.php?t=32638
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      12-16-2015, 05:31 PM   #7
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we carry the Pure turbos N20 / N26 stage 2
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      12-17-2015, 12:16 AM   #8
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Quote:
Originally Posted by chaungo View Post
Yeah, your best bet (and most safe) is running JB4, you'll push out a bit more power than a 335i, but it'll surprise most people as they won't expect a 320i/328i to be that fast.
Really? A stage 2 tune will make the N26 faster than the N55? Hard to believe.
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      12-17-2015, 12:18 AM   #9
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Originally Posted by Project Elite View Post
Really? A stage 2 tune will make the N26 faster than the N55? Hard to believe.
N20/N26 with JB4 map 1 268 whp / 302 wtq


N55 Stock 304 whp / 319 wtq


You need to go FBO + E85 to surpass the N55
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      12-17-2015, 06:16 PM   #10
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So I've also done a little research into this. Pure stage 2 seems to be the way to go. Though it's fairly pricey the last time I checked the Turbo upgrade was $2k and you need to send them your manifold/turbo.

Oh and you will likely need forged Pistons, rods and bolts. ABR Houston seems to be the only place that really know how to do this upgrade and it ain't cheap! I don't believe anyone has gone there yet. You'd also likely need chargepipes, higher flow downpipe, bigger FMIC & CAI to give the turbo space to breath.

Another contributor @e46m3lol had the hexon upgrade I believe with JB4 and blew his motor, though it was at a low power output and he wasn't pushing it, so perhaps not the turbo or tune.

Still I'd probably go with an ecu flash if I did this.

There are various other 2ltr 4 bangers out there pushing close to 400hp. So not beyond the realms of possibility. But like I said you'd need to spend a lot, and at that stage you'd be better off just upgrading to an M3/4.

I also like the sleeper idea, but still not convinced to go that far yet.

Then there is the issue of the auto tranny. The 8AT can only go to 340lbft, so you would have to limit it to that. Of course with the bigger breathing Turbo you'd keep torque flatter longer so bigger HP is what your going for. So perhaps you could keep the torque in spec and just get the HP.

Word is the n20 with forged internals, upgraded bottom end could take 350wHP. I'd love to see one get there safely.
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      12-18-2015, 01:19 AM   #11
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Quote:
Originally Posted by Stubok View Post
So I've also done a little research into this. Pure stage 2 seems to be the way to go. Though it's fairly pricey the last time I checked the Turbo upgrade was $2k and you need to send them your manifold/turbo.

Oh and you will likely need forged Pistons, rods and bolts. ABR Houston seems to be the only place that really know how to do this upgrade and it ain't cheap! I don't believe anyone has gone there yet. You'd also likely need chargepipes, higher flow downpipe, bigger FMIC & CAI to give the turbo space to breath.

Another contributor @e46m3lol had the hexon upgrade I believe with JB4 and blew his motor, though it was at a low power output and he wasn't pushing it, so perhaps not the turbo or tune.

Still I'd probably go with an ecu flash if I did this.

There are various other 2ltr 4 bangers out there pushing close to 400hp. So not beyond the realms of possibility. But like I said you'd need to spend a lot, and at that stage you'd be better off just upgrading to an M3/4.

I also like the sleeper idea, but still not convinced to go that far yet.

Then there is the issue of the auto tranny. The 8AT can only go to 340lbft, so you would have to limit it to that. Of course with the bigger breathing Turbo you'd keep torque flatter longer so bigger HP is what your going for. So perhaps you could keep the torque in spec and just get the HP.

Word is the n20 with forged internals, upgraded bottom end could take 350wHP. I'd love to see one get there safely.
Thanks for the good info man
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      12-18-2015, 07:21 AM   #12
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The n20 stage 2 - jb4 plus DP
Should beat a stock 335. In Australia a stock 335 puts out around 185kw atw and an N20 stage 2 should be similar to 185-195 kW atw depending on exhaust and intake set up. Either way the 328i is lighter (1430kg) verse 335 (1520kg) which more than offsets the torque of the six. Note that a stage 2 n20 will put out more torque than a 335i too. If you want more power after stage 2 though - you may as well buy a 335 and start modding that as the FBO 328i is fragile after that and there are no more easy gains without killing the engine
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      12-30-2015, 11:44 AM   #13
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Mercedes CLA 250 AMG makes 355hp, its crank HP, but its comes right from the dealer that way.

I assume its a forged bottom end and saw in one car mag or another that is maks 28psi as peak boost.

As Braddon said, if you want more than 330rwhp/400 crank you will need a bottom end to support the top.

But id love to see the setups out there.
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      12-30-2015, 01:44 PM   #14
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For 320i engine, understand that JB1 and JB4 (wo E85) make the same power and the difference being data logging etc for JB4.
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