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      09-21-2018, 06:51 PM   #1
M248
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Log Check Please!

Hi Guys,

I’m new to the N55 engine. Hoping someone can review a log for me.

Stage 1 MHD. Just replaced the charge pipe.

https://datazap.me/u/m248/n55-ewg-mhd-stage-1

Last edited by M248; 09-21-2018 at 07:42 PM..
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      09-22-2018, 08:34 AM   #2
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hey a sort of local guy... I just did my charge pipe too.. i think I hit 13.xxlbs boost too.. stage 1 BM3
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      09-23-2018, 02:01 PM   #3
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Holy crap, I just noticed the TQ limiters coming on.

Really hoping someone can chime in on my log.
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      09-24-2018, 11:32 AM   #4
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New to the N55 as well.. I don't know anything about the torque limiters but I noticed its during turbo spool up and non existent after that. Intake air temp rises 10 degrees over the pull, but is normal after 5k rpm where the compressor efficiency goes down. AFR concerns me as during spool up the AFR is quite lean and doesn't really get into what I would think is a good AFR. Example: you're hitting 13.5 psi and still have an AFR of 14:1! (are these wide band readings on our N55 engines?) Through out the boost range, the AFR only gets down to 12.3:1 which bothers me. My experience with a different engine (Mazdaspeed 3) Im used to seeing AFR's down around 11.7:1.

Just my thoughts.
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      09-24-2018, 11:59 AM   #5
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OP log looks about right - your IATs are high and probably causing the DME to pull some timing... you'd benefit a lot from a FMIC.

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Originally Posted by Jasbo View Post
New to the N55 as well.. I don't know anything about the torque limiters but I noticed its during turbo spool up and non existent after that. Intake air temp rises 10 degrees over the pull, but is normal after 5k rpm where the compressor efficiency goes down. AFR concerns me as during spool up the AFR is quite lean and doesn't really get into what I would think is a good AFR. Example: you're hitting 13.5 psi and still have an AFR of 14:1! (are these wide band readings on our N55 engines?) Through out the boost range, the AFR only gets down to 12.3:1 which bothers me. My experience with a different engine (Mazdaspeed 3) Im used to seeing AFR's down around 11.7:1.

Just my thoughts.
N55s run that lean. lean spool at the tip in is okay... and low-mid 12s (with 12.0-12.2 being best/safest on pump gas) is fine midrange to redline. you should see how lean they run stock
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      09-24-2018, 12:08 PM   #6
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Quote:
Originally Posted by F30_SixSpeed View Post
OP log looks about right - your IATs are high and probably causing the DME to pull some timing... you'd benefit a lot from a FMIC.



N55s run that lean. lean spool at the tip in is okay... and low-mid 12s (with 12.0-12.2 being best/safest on pump gas) is fine midrange to redline. you should see how lean they run stock
Good looking out!

Thanks for chipping in!
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      09-24-2018, 12:59 PM   #7
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Remember DI engines can run leaner than port injected.
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      09-24-2018, 08:10 PM   #8
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Quote:
Originally Posted by F30_SixSpeed View Post
OP log looks about right - your IATs are high and probably causing the DME to pull some timing... you'd benefit a lot from a FMIC.



N55s run that lean. lean spool at the tip in is okay... and low-mid 12s (with 12.0-12.2 being best/safest on pump gas) is fine midrange to redline. you should see how lean they run stock
Thanks SixSpeed appreciate the help!

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Originally Posted by Tchao View Post
Remember DI engines can run leaner than port injected.
Didn’t realize the DI was the reason these can run leaner. Thanks for the wisdom!
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      09-26-2018, 08:31 PM   #9
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Quote:
Originally Posted by F30_SixSpeed View Post
OP log looks about right - your IATs are high and probably causing the DME to pull some timing... you'd benefit a lot from a FMIC.
6” VRSF Race intercooler arrived today. I’ll be installing that and a Wagner HFC, and GFB DV+ soon.

I’ll post a few logs after the install!

Oh and I wanted to ask, should I opt to try the spring in the DV+? From what I’ve read it help throttle response considerably, but can potentially cause overboosting and related issues during shifting.
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