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Torque Datalog of S42, JB+, Wagner Comp FMIC, No Cat DP
For comparison sake I figured I'd post this up. Just wondering if everything looks normal to those who've datalogged their cars. Peak MAF reading with a brand new MAF is consistently 169 g/s - 22.2lb/min flow.
42f ambient/rainy out. IATs float between 4 and 8f over ambient, the Wagner Competition really works quite well, in summer it keeps IATs pretty close to ambient still.
Scheduled with RPM to get dyno tuned in about a month, I can't wait for more boost! It's always a bit weird how a bigger turbo can use less boost and make more power, but, that's what's going on here. Stock turbo I was hitting mid 16PSI, but it was slower, and ran out of boost around 5000-5500, the S42 pulls solid all the way to redline and it pulls harder everywhere.
I'm amazed at how rich the stock tune is, even with a lot more flow vs stock it's still crazy rich at 10.9 AFRs!! JMTC S42, Wagner Competition, Decat DP, JB+
After realizing the "short ram" style intake setup I was using was triggering a P00bd, I extended the intake to relocate the MAF back to nearly the stock position in relation to the turbo inlet. The MAF is no longer maxing out and now read 151g/s, interestingly, boost levels have risen and I no longer have the 10 PSI limit at lower RPM, it now rises higher and does it earlier on.
Saw 17.5 PSI today, but more importantly it's hitting 15-16 below 3k and holding to redline, this is untuned with just a JB+ (carb certified version) influencing the boost level.
Below is a new log clip, the AFRs are now staying mid 11s to redline instead falling into the tens, and timing is more advanced.
The lesson: .Don't run a short ram style intake on an N18!
What I was using was the boot provided by JMTC then the MAF then a filter with no piping. It all fit nicely together, but, the MAF signal was obviously too high.
To make it play nice I trimmed the stock inlet hose, just after the 90 degree turn, and put it between the MF and JMTC boot. On the filter side of the MAF I put the VIP setup back in and no more issues. Problem solved.
I've read but can't confirm that a JCW intake will work if the rubber is pulled out of the turbo inlet side. I've also been told the NM plays nice with the S42.
Actually that what I was getting at when I asked the question to see if you were in line with everybody else.
All the folks ive seen using an aftermarket bigger turbo, all seem to be using the NM intake with no issues.
You haven't thought about getting rid of the JB+ and going for an actual tune? I'm sure the tune would produce way more power across the band at all rpm's.
Going to visit RPM in Vancouver on 20 FEB . Target is a nice gentle 220-230 whp (auto car), since I do some long hill climbing stuff where the car sees full boost for long stretches of time (things like climbing Johnson observatory road at mount st Helen's).
I like the NM piece, great design, but I'll be building my own out of 2.75" alu, the mini is 3rd on the list of vehicles getting modified, as such the BMW tax on parts gets avoided where and when it can haha.
12-28-2018, 03:32 PM
. Target is a nice gentle 220-230 whp (auto car), since I do some long hill climbing stuff where the car sees full boost for long stretches of time (things like climbing Johnson observatory road at mount st Helen's).
