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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > N54, which FMIC to help with low end spool?



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      06-15-2017, 03:33 PM   #1
datpiff
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N54, which FMIC to help with low end spool?

Which FMIC should I get to help achieve 550~ hp on 93 to help spool up early? Was reading that getting a big fmic wide piping will be horrid down low but will be great high up in the RPM range. Was thinking ad engineering 650hp fmic but it's pretty big and it's got me concerned.

I'll be running VM's top mount kit with a 6062 gen 2 ball bearing turbo with the 3.5" dp.
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      06-15-2017, 03:45 PM   #2
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      06-15-2017, 03:47 PM   #3
9krpmrx8
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VSRF 7' race intercooler, it's the bestest shits ever man. It's made of titanium and the fin density is tighter than a gnat's ass.
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      06-15-2017, 03:49 PM   #4
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      06-15-2017, 04:14 PM   #5
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550hp is a LOT of power, especially on 93 only. You can't have everything.
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      06-15-2017, 04:19 PM   #6
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Quote:
Originally Posted by 9krpmrx8 View Post
VSRF 7' race intercooler, it's the bestest shits ever man. It's made of titanium and the fin density is tighter than a gnat's ass.
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      06-15-2017, 05:26 PM   #7
datpiff
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Can you guys be more on topic and lmk which fmic I should get lmao?
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      06-15-2017, 05:42 PM   #8
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Quote:
Originally Posted by azimov308 View Post
Can you guys be more on topic and lmk which fmic I should get lmao?
Well do you want best possible spool or do you want something that will support a 550whp on 93 setup? You can't have both.
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      06-15-2017, 08:51 PM   #9
datpiff
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Quote:
Originally Posted by bradsm87 View Post
Well do you want best possible spool or do you want something that will support a 550whp on 93 setup? You can't have both.
Can I get a happy medium?

Realistically, I'll probably be getting low 500's if that makes a difference
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      06-15-2017, 10:21 PM   #10
arhoads335i
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Just look at the designs of the end tanks, then the size of the cores and quality. Smaller core usually means less pressure drop I assume. I would think a 6 inch with a heavy duty core would be the perfect medium! Air flow is important also so definitely just take the front bumper off hahaha
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      06-15-2017, 11:12 PM   #11
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Quote:
Originally Posted by arhoads335i View Post
Just look at the designs of the end tanks, then the size of the cores and quality. Smaller core usually means less pressure drop I assume. I would think a 6 inch with a heavy duty core would be the perfect medium! Air flow is important also so definitely just take the front bumper off hahaha
You think a ad engineering 650hp might be too much to help low end?
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      06-15-2017, 11:58 PM   #12
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Spool is a function of the aero of the compressor wheel (although you can help/hurt via tune)... and sure, excessive pressure drop will hurt you in a FMIC, but not as much as a poor tune. Remember pressure drop will increase with increased air flow, so at spool you're not really flowing that much air... pressure drop won't be a big deal on any of them that you're considering. We like the VRSF race and the AD-e offerings best.

Chris
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      06-16-2017, 09:05 AM   #13
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ETS 7"
ER 6"
VRSF Race 7.5" or 7" HD
AD E
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      06-16-2017, 09:17 AM   #14
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Quote:
Originally Posted by azimov308 View Post
Can you guys be more on topic and lmk which fmic I should get lmao?
You need to start thinking outside of the box...look up top mount intercoolers; fast spool for days.
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      06-16-2017, 10:49 AM   #15
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Quote:
Originally Posted by 9krpmrx8 View Post
VSRF 7' race intercooler, it's the bestest shits ever man. It's made of titanium and the fin density is tighter than a gnat's ass.
At 7 foot, will we have to mount this on the roof?

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      06-16-2017, 11:21 AM   #16
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intercooler is not going to effect spool enough to really notice between any of the options you have
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      06-16-2017, 01:06 PM   #17
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Build a diamond intercooler the size of the stock one.

/thread
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      06-16-2017, 01:31 PM   #18
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Just don't buy some crappy no name eBay fmic and spool won't be an issue.
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      06-19-2017, 11:58 AM   #19
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Here's some 2-4 gear pull logs of our 7" HD on a stock turbo car pushing about 450whp. 12 degree rise, 99f at 2k rpm in 3rd to 111f at 6.1k rpm in 5th.

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      06-19-2017, 03:45 PM   #20
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Best intercooler for low-end spool? The stock one.
Best intercooler for power? Anything other than stock.
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      06-19-2017, 03:46 PM   #21
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You won't notice a difference in spool with a decent intercooler.
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      06-19-2017, 06:13 PM   #22
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Quote:
Originally Posted by azimov308 View Post
I'll be running VM's top mount kit with a 6062 gen 2 ball bearing turbo with the 3.5" dp.
The FMIC won't be the primary contributor to bad spool. In fact, subpar tuning or a poor flowing manifold will have significantly more impact on low end spool. Any of the mainstream FMIC options should do the job, but if there's a possibility you'll chase more power, you may want to go with a 7" core.

By nature, a single turbo is gonna require you to keep it on boost and shines as you rev it out. So don't expect ~500 WTQ at 3,000 RPMs like you get with the OEM twins.
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