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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 > 5" versus 7" FMIC - Lag issues?



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      04-06-2015, 11:40 AM   #1
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5" versus 7" FMIC - Lag issues?

I plan to stay on stock turbos for the foreseeable future - will I see a lag difference between the 5" stepped and 7" FMIC? Is there a gain to be had, powerwise, with the larger intercooler?
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      04-06-2015, 11:47 AM   #2
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I haven't compared them personally so I'm not sure about the potential lag, however the 7" will cool better than the 5" stepped. Although anything bigger than stock is a huge upgrade.
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      04-06-2015, 11:53 AM   #3
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Both will make the same power but a 7" will have less tendency to heat soak.

The pressure loss and lag is negligible in my opinion.
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      04-06-2015, 11:59 AM   #4
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Quote:
Originally Posted by Jeff@TopGearSolutions View Post
Both will make the same power but a 7" will have less tendency to heat soak.

The pressure loss and lag is negligible in my opinion.
That's what I was looking for. Thanks Jeff!
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      04-06-2015, 12:07 PM   #5
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Agree with Jeff
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      04-06-2015, 12:22 PM   #6
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Same, agree with Jeff and also direct personal experience to back it up. Went from 5" non-stepped to 7". No lag difference and much better heat soak properties.

No extra power either except when things had gotten too hot previously and the 7" cured that. Was getting timing pulls with the 5" and under similar conditions none with 7". Stepped 5" may be closer to 7" as far as heat soak goes, and since no lag diff between non stepped 5" vs 7" I doubt any with stepped.
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      04-06-2015, 02:11 PM   #7
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JB4 on map5 automatically compensates for the lag, no issues ... Cobb has a setting for it I dont remember what it was called now
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      04-06-2015, 02:44 PM   #8
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Quote:
Originally Posted by ajsalida View Post
Same, agree with Jeff and also direct personal experience to back it up. Went from 5" non-stepped to 7". No lag difference and much better heat soak properties.

No extra power either except when things had gotten too hot previously and the 7" cured that. Was getting timing pulls with the 5" and under similar conditions none with 7". Stepped 5" may be closer to 7" as far as heat soak goes, and since no lag diff between non stepped 5" vs 7" I doubt any with stepped.
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      04-06-2015, 03:10 PM   #9
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Haven't noticed any lag differences with mine either. PITA to cut the plastic but well worth it once it's in.
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      04-06-2015, 04:45 PM   #10
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hi,
I personally have a 7 inch.. as stated above this mod won't make more power but what it will do is keep you from losing HP in the upper range of the RPM.
you do not notice it as much with a stock tune but it becomes very apparent when you up the boost. the drop in power around 6500-7000 to redline.

if your tuned this is one of the must mods in my opinion.

hung
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      04-06-2015, 06:00 PM   #11
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As far as "more power" goes, cooler air carries more oxygen to go boom. Which equals "power". Cooler temps will always be best.
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      04-06-2015, 06:37 PM   #12
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Quote:
Originally Posted by 335NJ View Post
As far as "more power" goes, cooler air carries more oxygen to go boom. Which equals "power". Cooler temps will always be best.
Of course. The point is a 5" will cool down to the near-ambient limit as well as a 7" up to a point. The 7" adds nothing. Then it starts getting hotter after multiple WOT pulls or you get a more aggressive set of mods and run higher boost, only then will the benefits of a 7" start to kick in.
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      04-06-2015, 07:47 PM   #13
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There's a lot of good info in this thread but I'll just add that a 7" intercooler will make more power up top on a 2-4 gear pull in comparison to a 5" due to it's ability to keep temps as close to ambient as possible (assuming the fin pack design is the same).

You may not notice the difference on a third gear pull but you'll definitely notice on a multiple gear pull or a back to back pull.
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      04-08-2015, 12:59 PM   #14
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I've had the 6" AA IC for about 6 months now. I love it! No heatsoak issues so far, & didn't have to cut anything for the install.
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      04-08-2015, 02:05 PM   #15
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Yes and being in florida for me the extra heat disappation helps a lot.
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      04-08-2015, 03:10 PM   #16
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Quote:
Originally Posted by Fundguy1 View Post
Yes and being in florida for me the extra heat disappation helps a lot.
You should see no lag with wither sized FMIC. As for power gains a larger unit or a more efficient core will give you upper RPM and higher gear / load gains versus a smaller unit, and most importantly won't heat soak as fast as a smaller unit. So if you are driving the car hard for an extended amount of time a larger / more efficient unit is beneficial.

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