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      07-27-2018, 09:06 AM   #23
Riick
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The F30 328ix which has the same N20 engine runs mid/low 13's all day long on a bone stock car with nothing but a JB4 tune with around 270whp and 320lb torque. With a catless downpipe it puts the engine around 300whp and deep into the low low 13s.

The X3 28i xdrive only weighs about 400lb more which equals to about .1 slower, which puts it in the high 13s with the same amount of horsepower stock with a JB4. With a downpipe mid 13s.

The fuel system on the N20 can easily support a 12 second car.

If you're running run flat tires add .2 seconds to your track times.

My 2013 28i has the BMS JB+ and Firestone Indy 500 tires it's comical how much faster it is over stock and how much better it corners. I'll upgrade to the JB4 and catless downpipe later this year. I think I'll track it down the 1/4 next week and post results of stock with JB+.

N20 tuning and upgrading is huge and has been for years. No idea why ya'll are acting like it's something new and foreign just because it's in an F25 chassis and not F30. Same engine and drivetrain and the weight difference is that of having a passenger or two in the F30.

Last edited by Riick; 07-27-2018 at 09:15 AM..
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      07-27-2018, 11:42 AM   #24
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I wonder if bootmod3 will ever be available for the x3 n20? It looks as though only the n55 x3 is supported.
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      07-27-2018, 12:04 PM   #25
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I'm sure a phone call and some dollar bills can fix that.
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      07-27-2018, 02:46 PM   #26
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Perfect, found some metal charge pipes!

https://www.ftpmotorsport.com.tw/pro...t-pipe-20i-28i
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      07-27-2018, 02:58 PM   #27
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BM3 support confirms this works on the X3 28i:

https://www.protuningfreaks.com/coll...428i-520i-528i
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      07-27-2018, 03:21 PM   #28
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Nice!
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      07-27-2018, 03:28 PM   #29
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I like the sales pitch of the BM3, but the more I read that's all it is...good marketing.

The fastest documented F30 N20's are all JB4 or Dinan. There isn't a single BM3 N20 powered car documented even running in the 13s.

I think I'm going to stick with my decision to run a JB4.
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      07-31-2018, 07:58 AM   #30
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Quote:
Originally Posted by Riick View Post

My 2013 28i has the BMS JB+ and Firestone Indy 500 tires it's comical how much faster it is over stock and how much better it corners. I'll upgrade to the JB4 and catless downpipe later this year. I think I'll track it down the 1/4 next week and post results of stock with JB+.
.

Looking forward to your time slip, I put you at 14.5; 15.0 to start, -0.3 for the JB+, -0.1 for the tires and -0.1 for generosity. Still significantly slower that a bone stock 35i.
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      07-31-2018, 08:41 AM   #31
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Significantly slower? A bone stock 35i runs mid 14s. Put down the crack pipe.
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      08-01-2018, 10:13 AM   #32
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Quote:
Originally Posted by Riick View Post
Significantly slower? A bone stock 35i runs mid 14s. Put down the crack pipe.
14.1 is documented by many sources like Road & Track for example. 0.1 is not "mid". Perhaps you should move away from the pipe and go produce a time slip using your car that is "faster than a 35i".
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      08-01-2018, 11:36 AM   #33
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First off timing chains don't break on N20s that is super rare maybe 100 cars ever. RIICK
.
maybe 100 cars ever ? ? ? ?

and the X28i is a 10 second machine . . . . . . bone stock !

and the wicked witch of the West was really the president of ASPCA ?

Im just a bit surprised of the need to squeeze the n20, especially on a daily driver.
Is it to some considered the base of a good street tuner racer?
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Last edited by Scout10; 08-01-2018 at 11:43 AM..
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      08-02-2018, 10:17 AM   #34
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I love ya guys, but there's some massive confusion here in the X3 forums about the N20 that does not exist in any other N20 platform specific forums. It's a very reliable and capable engine with pretty much zero issues. There's tons of 328iX cars running mid 13s with basic mods. No reports of N20 timing chain issues in the F30 forums either, it's the most common engine BMW sells there's MILLIONS of them on the road.

In the end, the X3 is an SAV, not a street race car.. but if you can get one to run 13's with a couple hundred bucks? Why the hell not. Just quit with the high school rumor spreading that N20's fall apart and are dog slow. The 28i and 35i are both 14 second cars off the showroom floor and both run 13s with basic mods.

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      08-02-2018, 01:23 PM   #35
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^ thank you
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      08-03-2018, 12:44 PM   #36
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So i guess the N20 chain thing is . . . . just a bad rumor ?
And those that report it . . . and had it fixed on warranty or out of pocket . . . . . it wasn't really the chain?
And the talk of a class action, or individuals on here reporting the chain thing . . made up rumors......
well okay . . . if YOU say so.

You nor i have information or ability to declare its effected % as no one has access
to the BMWusa DATA. But i'm not going to deny existance.

best of luck at the drags !
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      08-03-2018, 02:21 PM   #37
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Sorry Scout10, but there's no reports of any timing chain failures on any other N20 based forum, nor are any of the millions of N20 powered cars on the road today just randomly breaking down everywhere. I'm personal friends with my service manager at Fields BMW in Orlando and they NEVER, not once, in the history of the N20, got one in that has failed. The percentage of timing chain failures in the N20 is no greater than the amount of timing chain failures of the N55. Stuff breaks nothing is perfect not even BMW, that's why they offer warranties.

Do you believe the Earth is flat as well?
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      08-03-2018, 02:47 PM   #38
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There was a class action lawsuit brought against BMW for the number of N20 timing chain failures. BMW extended the warranty on affected cars to 7yrs/70k. They released completely redesigned parts to address the issue. "N20 Timing Chain Problem" returns 128 THOUSAND results on the Google.

This is a real issue.
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      08-03-2018, 03:02 PM   #39
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Googling Flat Earth results in 368,000,000 results, but... it's still round despite the millions of people say it's flat.

Put the internet down, mind your own business, and drive your car. Your engine isn't going to spontaneously fall apart. My engine isn't either, nor anyone elses on this forum. Don't parrot rumors and spread misconceptions.

Last edited by Riick; 08-03-2018 at 03:07 PM..
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      08-03-2018, 07:24 PM   #40
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My cars' engines surely aren't going to spontaneously fall apart, as one is an N52 and the other is an N55; neither have timing chain guide problems. ¯\_(ツ)_/¯
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      08-04-2018, 11:50 AM   #41
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Quote:
Originally Posted by Riick View Post
Googling Flat Earth results in 368,000,000 results, but... it's still round despite the millions of people say it's flat.

Put the internet down, mind your own business, and drive your car. Your engine isn't going to spontaneously fall apart. My engine isn't either, nor anyone elses on this forum. Don't parrot rumors and spread misconceptions.
no one spoke of the earth's shape, or people are not submitting to your sway. So, bad mouth them, makes sense to you ? ? ?
And on a forum your directing people to mind their own business ? ? ?

The rumors and misconception . . . . . its mechanical reality !
BMW extending warranties for the chain is rumors and misconception ? ? ?
They must have done it when the earth was flat ? ? ?
What ever............ time for the KBG ............. go for it. bye
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      08-04-2018, 02:14 PM   #42
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There was a recent report of a timing chain failure with a 2017 X3 28i with the N20 engine at 43,500 miles. Such timing chain problems may be rare with the re-designed timing chain guide, but do exist.

https://www.bimmerfest.com/forums/sh...6#post12664416
See post #329 at the link above.
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      08-04-2018, 06:56 PM   #43
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There was a recent report of a timing chain failure with a 2017 X3 28i with the N20 engine at 43,500 miles. Such timing chain problems may be rare with the re-designed timing chain guide, but do exist.

https://www.bimmerfest.com/forums/sh...6#post12664416
See post #329 at the link above.
And MichiganMike . . . . is there a reason WHY the timing chain design and material were changed?
And why was the guide also redesigned?
Which caused it to be rare now.

And how did MichiganMike end up in Maryland ? ? ? ?
work transplant ? Does MM fly a flag of the Maze & Blue or
Green & white out there?
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      08-04-2018, 07:23 PM   #44
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Quote:
Originally Posted by Scout10 View Post
And MichiganMike . . . . is there a reason WHY the timing chain design and material were changed?
And why was the guide also redesigned?
Which caused it to be rare now.

And how did MichiganMike end up in Maryland ? ? ? ?
work transplant ? Does MM fly a flag of the Maze & Blue or
Green & white out there?
There are a number of sources that discuss the BMW N20 engine timing chain issues and redesign, such as those at the links below. I do not claim to be an expert on the subject. Some have suggested that timing chain problems were limited to the 2013 X3 and some early 2014 models, before the timing chain guide re-design.

https://oppositelock.kinja.com/bmw-n...tes-1716844660

https://bmwtechnician.com/2016/08/07...g-chain-issue/

I am a University of Michigan graduate as are my two daughters. No house divided in our case, but only Maize and Blue. My daughters moved to Maryland for work following their graduation. My wife and I purchased a condo in Annapolis following retirement, but still have a place in Michigan.
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