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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 > Stage 1 Log OFT



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      03-13-2014, 02:18 PM   #1
AlpineSwift
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Stage 1 Log OFT

http://datazap.me/u/alpineswift/stag...ata=1-2-3-4-10

And here's stage 0 for reference. same mods. just different ambient temps.

http://datazap.me/u/alpineswift/stg-...&data=1-3-4-10

Starting to wonder if the low boost amount is attributed to the fact that I've still got the stock dp's. I know the altitude has something to do with it but I'm not getting close to 17lbs either. Not like I was with Stage 2 anyway (even though Stage 2 is risky with stock dp's).

Thoughts? (Yes, both runs were done on 91. At this altitude, 91 is a lot like 93 especially with E10 mixed in from the pump. I try to add 5 gallons of E85 every now and then)
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E92 '08 335Xi 6AT - Cobb AP3 Tuned by MAC Autosport, Original Prototype Xi DOCRace 6266 Single Turbo Swap, VRSF CP w/Synapse BOV, VRSF 7" FMIC, BMS Cowl, H&R Coilovers, Renn Motorsport RS-51's, Stoptech Stage 2 Slotted, xHP Stage 3, Earl's Racing Oil Cooler, Turner Boost Gauge, M3 Lip Spoiler.
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      03-13-2014, 11:11 PM   #2
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Nothing? Really? Damn.
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E92 '08 335Xi 6AT - Cobb AP3 Tuned by MAC Autosport, Original Prototype Xi DOCRace 6266 Single Turbo Swap, VRSF CP w/Synapse BOV, VRSF 7" FMIC, BMS Cowl, H&R Coilovers, Renn Motorsport RS-51's, Stoptech Stage 2 Slotted, xHP Stage 3, Earl's Racing Oil Cooler, Turner Boost Gauge, M3 Lip Spoiler.
Standing Mile Record Holder for Xi over a mile high: 168.2MPH @ 5512'; The Colorado Mile hosted by The US Mile.
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      03-19-2014, 04:41 PM   #3
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I pulled another log today as well as a log on my dad's 335 (N54, I8AOS, Xdrive, 6AT, DCI's and Stg 0 OFT Tune). I could really use some expert help about what's going on here.

His
http://datazap.me/u/alpineswift/dad-...g=0&data=1-3-4

Mine
http://datazap.me/u/alpineswift/stg-...g=0&data=1-3-4

I'm wondering if the pressure drop in the higher RPM's on mine vs his car is related to that big ass FMIC I have. If it is I'm not gonna gripe, but it doesn't make a lot of sense how he's got a very steady boost curve vs mine really nose dives. Stg 1 vs Stg 0 my mods vs his. I know every car is different, but he's at 49K miles on the stock plugs running 91 octane and I just had my plugs replaced @ 45K miles and I'm running E40.

I know I don't have a boost leak anywhere and the WGDC logs I've pulled in the past haven't shown anything that would indicate the turbos are going. What gives?
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E92 '08 335Xi 6AT - Cobb AP3 Tuned by MAC Autosport, Original Prototype Xi DOCRace 6266 Single Turbo Swap, VRSF CP w/Synapse BOV, VRSF 7" FMIC, BMS Cowl, H&R Coilovers, Renn Motorsport RS-51's, Stoptech Stage 2 Slotted, xHP Stage 3, Earl's Racing Oil Cooler, Turner Boost Gauge, M3 Lip Spoiler.
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      03-19-2014, 05:05 PM   #4
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I’ll need to actually look at the log to be sure, but bottom line is it’s not easy to boost at your altitude. Stock frames struggle to breath at higher revs even in perfect conditions. May need to mess with the base tables to add in a bit more duty cycle upstairs.
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      03-19-2014, 05:51 PM   #5
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Quote:
Originally Posted by 135Pats View Post
I’ll need to actually look at the log to be sure, but bottom line is it’s not easy to boost at your altitude. Stock frames struggle to breath at higher revs even in perfect conditions. May need to mess with the base tables to add in a bit more duty cycle upstairs.
I know these turbos hate this altitude but I definitely appreciate taking the time to take a look when you get a chance. I flashed back to Stg 0 after doing Stg 2 beta without the FMIC or DP's a while back. When the DP's get installed, it's on like donkey kong for Stage 2 again.
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E92 '08 335Xi 6AT - Cobb AP3 Tuned by MAC Autosport, Original Prototype Xi DOCRace 6266 Single Turbo Swap, VRSF CP w/Synapse BOV, VRSF 7" FMIC, BMS Cowl, H&R Coilovers, Renn Motorsport RS-51's, Stoptech Stage 2 Slotted, xHP Stage 3, Earl's Racing Oil Cooler, Turner Boost Gauge, M3 Lip Spoiler.
Standing Mile Record Holder for Xi over a mile high: 168.2MPH @ 5512'; The Colorado Mile hosted by The US Mile.
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