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BMW 3-Series (E90 E92) Forum
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328's N52 ECU Successfully Tuned by CS Tuning/LET Motorsports
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04-22-2009, 09:16 AM | #243 | ||
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I was kinda expecting to see higher numbers myself but I didn't know the AWD usually loses about 20% of its power between the crank and wheels (plus an extra 10% on the mustang dyno). I'll be thinking about RWD for my next car for sure. |
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04-22-2009, 09:38 AM | #244 |
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I noticed that on your dyno sheet that your AFR's are quite lean at just over 15. Optimal afr's that I have seen usually range from 12.5-13.5 Any chance you have a full plot of rpm vs afr? Also, I noticed that you power kept increasing, but the dyno graph stopped at 6300rpms. Any reason for not going to the full 7k?
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04-22-2009, 09:52 AM | #245 |
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that is the maximum. BMW's naturally like to be a bit lean but the AFR's do drop down, he just posted maximum so you'll see the max (essentially at idle).
The power flattens out after 6300rpm on the stock car. A couple of pulls were done to 7200 and actually dropped off after 6300 so pulls to 7k were stopped as they were deemed unnecessary. The potential to keep power going past 6300 was seen but it never went up after that point.
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04-22-2009, 09:53 AM | #246 | |
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Strangely enough, I have seen a small increase in MPG's when I'm not driving it hard (normal city driving or highway coasting). We decided NOT to push the engine as far as it could go because 6100 rpms is where we saw a drop in power the 1st time around on the stock runs. Our last 4-5 runs after the tune we upped it to 6300, 6500 and then 7000 and saw it was still making power at 6300 rpms with the new tune but then plateaued and started dropping again after 6500 rpms so in the interest of not over doing it on the engine, we just kept it at 6300 rpms and stopped the last few runs there. |
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04-22-2009, 09:56 AM | #247 | ||
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Thanks for the info, sounds good!
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///Mods: Xpel front clip wrap, Nokya 2500k H8 halos, matte grills, IND reflectors, scoops, MS drop-in, MS track pipes, Dinan exhaust, 240E, ESS tune, BBS CHR, s04 255x35 295x30, KW Clubsports, ceramic pads Retired: 08' E92 328i JB 6mt 212 rwhp 190 rwtq |
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04-22-2009, 10:57 AM | #248 |
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Udubbadger, kudos and my respect to you for being the guinea pig and reporting back to us the results in a well-documented manner. ASAIK, this is by far the best 'proven' tune for the N52. Other 328i will have you to thank for having this tune optimized for the 328i. Hope there are 325i and 330i owners in the Chicago area that can go into the shop to have the tune customized for those particular cars as well.
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04-22-2009, 11:07 AM | #249 | |
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04-22-2009, 11:22 AM | #250 |
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hopefully ill be in there on the 29th or 30th when tony gets back.
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04-22-2009, 11:34 AM | #251 |
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04-22-2009, 11:46 AM | #252 | |
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its been proven that a mustang reads a considerable amount lower than a dynojet. But i could be wrong. It has been different on my previous cars
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04-22-2009, 11:58 AM | #254 |
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04-22-2009, 12:04 PM | #255 |
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04-22-2009, 12:55 PM | #256 | |
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In respect to your differing numbers from mustang to dynojet, its only about a 15% difference so who knows, maybe they didn't factor in any weather numbers or something. Last edited by UdubBadger; 04-22-2009 at 01:22 PM.. |
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04-22-2009, 01:26 PM | #257 | |
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04-22-2009, 02:10 PM | #259 |
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04-22-2009, 02:24 PM | #260 |
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04-22-2009, 02:30 PM | #261 |
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it works, its just a matter of letting them "tweak" anything necessary. I'd suggest contacting Tony and seeing if/when he'll be out in Cali (should be soon) and maybe you guys can meet up and let him do the tune to your car, dyno and then tweak if necessary.
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04-22-2009, 02:34 PM | #262 |
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So, I know that the tune is guaranteed for the life of the vehicle and that they claim that they have worked around the ECU's re-learning.
It makes sense at some level and doesn't at some level to me. ECU re-learning does NOT: - increase / reduce the power output as far as I can tell, I am not sure what the ECU actually modifies to "learn" the driving habits This Tune does: - increase the power - again I don't know what this is modifying but maybe it is different from what the ECU will try and relearn. However, it is POSSIBLE that whatever the ECU does to re-learn may cancel out the effect of the tune. I am concerned that while they would be happy to do a reflash for you if the tune goes away, it would become a hassle if it does go away. (Disconnecting the battery for 30 mins is still a hassle ) I am not sure what the learning period is, but would they be into dynoing your car again after some period of time, just as an assurance? Maybe I'm asking for too much, maybe I'm asking the right thing, maybe I'm not even on the right track... Thanks again for stepping up to do this, both to you and Tony. BTW the deposit for remote flash is 2k |
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04-22-2009, 02:39 PM | #263 |
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learning is still enabled but what this does (if i believe) is it changes the maps so what the ECU is learning is adapting to the modified maps in the ECU. So if anything after 100-200 miles you will INCREASE power not decrease power. That is something i have noticed with my turbo flash, the car now seems more powerful and seems faster. Could be the placebo effect but it does make sense. This is not a signal intercept like the procede, jb3 or sstt or anything, it literally CHANGES the maps that are in the ECU.
I'd have to verify with tony but i believe that is what is going on here.
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04-22-2009, 02:57 PM | #264 | |
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