12-25-2015, 09:01 PM | #1 |
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Do I need an intercooler
Hey all,
Just placed order for a catted downpipe, and BMS stage 1 tune. My car currently has BMS intake on it and I'm wondering if I need an intercooler for the car to run reliably? I tried to search on the forum but maybe I missed the discussions. Any thoughts would be appreciated!
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12-25-2015, 10:44 PM | #2 | |
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12-25-2015, 11:09 PM | #3 |
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Thank you! So usually at what stage an intercooler is required to avoid overheating issues?
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12-26-2015, 03:55 AM | #4 |
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Given that M2 uses same IC as m235i you will be fine with OE IC.
Here in UK I'm using OE IC with jb4 catted DP on pump fuel and getting 400/460 crank power/torque on map 6. You can try logging in map 5 to see how boost, AFR and ign av are. Map 1 gives +4 psi over stock and map 5 should exceed this easily and safely. |
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12-26-2015, 07:58 PM | #5 | |
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12-27-2015, 03:44 AM | #7 |
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No meth.
My suggestion is you build your own map 6 by logging WOT runs on map 5 and then create your map 6 baseline. If your ign adv, AFR and pwm are all ok then consider stepping up the boost in 0.5psi steps until ign adv starts to drop. |
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12-27-2015, 03:47 AM | #8 | |
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Here is where I'm at. I wanted someone to compare with since it's rare to find someone doing stock turbo map 6 on these cars. 1500 11 2000 13 2500 15 3000 16 3500 16.5 4000 17 4500 17.5 5000 16.5 5500 15.5 6000 14 6500 12.5 7000 12
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12-27-2015, 09:09 PM | #10 | |
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My actuals are close to target, it just sucks that I'm having fueling limitations. I tried map 7 once with this same setup and fuel, I was hitting 19psi for most of the rev range until my HPFP gave up and caused me to misfire.
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12-28-2015, 02:40 PM | #11 |
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You may have to back down your target 17.5 to 17psi @ 4.5k. Going for targets north of 17psi may be causing your problems. Have compared your map 6 log with map 5 logs ? BP
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12-28-2015, 03:08 PM | #12 | |
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12-28-2015, 06:34 PM | #13 | |
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And you're probably right, as much as I hate to back down on the boost, I may need to lower it
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12-29-2015, 10:23 AM | #14 |
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You don't need an intercooler but if you want to gain horsepower its definitely a recommended.
As you increase boost you create more heat and reduce efficiency, which reduces potential horsepower gains and overall consistency between back to back runs. As you heat soak the engine, you will have less and less power as the stock intercooler heat soaks. |
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12-29-2015, 09:58 PM | #15 |
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The M2 uses an "over-boost" function, clearly indicating that its borrowed M235i FMIC is already very close to its thermal limits. I would say that anything beyond a mild tune will necessitate a FMIC upgrade for any type of real duty beyond the occasional street romp.
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12-30-2015, 02:57 AM | #16 |
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Not sure I understand your logic. Why does a 360bhp n55 m car with over boost mean that m235i FMIC is close to its limits ?
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12-30-2015, 10:37 AM | #17 | |
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That's where the over-boost function comes in by only applying that bit of extra boost BMW needed to hit its performance targets (i.e., make the M2 competitive with its contemporary German rivals) only momentarily and mitigating the chance for the intercooler to heat-soak. What this all means is that the stock M235i/M2 FMIC lacks much headroom (then again, so might the turbo!) and anything beyond a mild tune will heat-soak it when pressed hard. Want to live in the 400hp+ range happily? Upgrade |
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12-30-2015, 11:55 AM | #18 |
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Ok - I think we are on the same page as I'm at low 400's Bhp on OE FMIC and it works fine but if I went further with more power ie north of 450 then I would upgrade.
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12-30-2015, 02:24 PM | #19 |
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When you guys say you are fine, what are your intake temps?
If they are more then 20 degress above ambient, you need an upgrade. Stock intercooler is pretty bad, even on stock boost. |
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12-30-2015, 04:51 PM | #20 |
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HAHA, this isn't an N54. The ER intercooler was the last thing I did, and I only did it so that I can be FBO. Another member here was on a Stage 2 turbo making 500+whp on stock IC. You don't need the intercooler unless you are boosting a lot and tracking. Sorry, I hate any vendor that upsells.
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12-30-2015, 05:25 PM | #21 |
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From my experience so far, you are wrong
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12-31-2015, 10:47 AM | #22 | |
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