Peak torque at 506ft lbs (6AT) anything to be concerned about for trans / engine longevity?

romnation

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Aug 25, 2020
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I just ran a dyno on my car, and my peak torque is topping out at 506ft lbs. (09 135i 6AT, full bolt ons, 40% e85 and custom tune)

Is the trans and engine okay to handle this much torque? I'm a bit concerned on longevity.

Dyno attached
 

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Torgus

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Nov 6, 2016
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Yes and no. I am not an expert on the autos but I would think you would want at least the xhp transmission tune possibly custom tune on top.

Fresh fluids and sonnax zip kit would only help.

With autos, in general, a lot depends on how it was driven before.

There are limited 'real' auto tranny upgrades available unfortunately. But you also are not pushing 'high' tq.

I am sure someone else will chime in with more information for you.
 
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nyt

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As others have said, you'll be fine with just XHP for increased holding pressure.

What's up with those AFRs, though?
 

romnation

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Aug 25, 2020
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As others have said, you'll be fine with just XHP for increased holding pressure.

What's up with those AFRs, though?


Hi, are you seeing an issue here? Aren't these the expeted afrs for these cars?

Per the jb4 manual (I'm not running jb4, i'm running a custom flash tune, but I imagine it should apply to any n54 setup):

AFR: Typical values are 15:1 at light engine loads decreasing to around 12.5:1 under heavy engine loads and high rpm.

Everything else I read regarding e85 blends also seem to target around 12.5.


Looks like that is exactly where I am, yes? What issue are you seeing?


Also I have xHP already installed so we should be good there. :)
 
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135Pats

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Nov 17, 2016
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So long as you aren't loading the crap out of the car at low RPMs, the motor and 6AT should be OK at 500WTQ - I'd add xhp for some extra clamping force. It made a huge difference when I went single turbo with more like 575wtq.

You are running that sucker lean and mean, for what it's worth. Personally I'd like to see it richen up earlier in the rev range, ethanol or no ethanol.
 

romnation

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Aug 25, 2020
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So long as you aren't loading the crap out of the car at low RPMs, the motor and 6AT should be OK at 500WTQ - I'd add xhp for some extra clamping force. It made a huge difference when I went single turbo with more like 575wtq.

You are running that sucker lean and mean, for what it's worth. Personally I'd like to see it richen up earlier in the rev range, ethanol or no ethanol.


What I am really confused about here is it looks like my datazap logs have WIDELY different AFR readings from what my dyno pull today states. Is maybe the dyno reader not accurate for AFR?

Log below:

 

135Pats

Specialist
Nov 17, 2016
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What I am really confused about here is it looks like my datazap logs have WIDELY different AFR readings from what my dyno pull today states. Is maybe the dyno reader not accurate for AFR?

Log below:

That looks much better. The tailpipe AFR you're pulling from the dyno is generally accurate, but all things being equal I'd trust what the actual widebands are telling you, especially since bank 1 and 2 are tracking pretty well.

Is anyone still making those improved widebands that spliced into the factory harness? When I was still in this platform, those were the go-to if you were making power. High sample rate, more accurate readings, etc. I don't recall who made 'em at this point.