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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > N47 and N57 Turbodiesel Engine / Drivetrain / Exhaust Modifications > Help me understand my BHP/Torque graph
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      04-20-2019, 03:56 PM   #1
BelgianBimmer7
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Help me understand my BHP/Torque graph

Hi guys,

I've had a tune done to my 316d because obviously I wasn't a fan of its power and now it isn't rapid, but it brings a smile to my face when I give the car some throttle.

Before and after the tune the car had some dyno runs and the mechanic that did the tune gave me a graph showing my gains.

What does the graph *really* translate to? I really am a car noob so I don't know how far I can rev the car without hurting it.

If anyone can help me explain what this graph really means I would appreciate it thanks. I hope the image is clear enough.

Thx in advance.
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File Type: pdf 20190411_172056.pdf (3.44 MB, 329 views)
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      04-20-2019, 04:33 PM   #2
Watsey
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What graph ?

Looks like you forgot to attach it
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      04-20-2019, 05:15 PM   #3
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I saw the pdf of it. It's showing a large increase in power from the low original numbers. In fact, I hope your clutch can handle it. I wouldn't run it hard under 2000 rpm, and consider 4700rpm a good upper limit.

The car is probably very different now, no?
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      04-20-2019, 09:45 PM   #4
BelgianBimmer7
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Yes. I've always driven "ordinary" cars and when I got the F30 I was initially very happy with it but over time it got a bit boring so now after the tune I feel like I'm in a Ferrari lol.

Thx for the reply btw !
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      04-23-2019, 05:43 AM   #5
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Whoa. That must be a different car now.
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      04-23-2019, 10:09 AM   #6
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The OP's car is allegedly making 193 hp/316 ft lb on a cool day, 16C. These guys advertise 179 hp/292 ft lb of torque on a 2012+ 316d.

https://www.celtictuning.co.uk/servi...tuning/stage-1

Those are 320d numbers. I see that the 316d motor is also a 2.0, but what about the internals, can they handle 320d grunt.
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      04-23-2019, 10:51 AM   #7
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Turbo and fueling system is different on the lesser power N47, but I doubt internals are much different. Realoem will know better.
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      04-23-2019, 01:01 PM   #8
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Quote:
Originally Posted by BelgianBimmer7 View Post
Hi guys,
.....


What does the graph *really* translate to?
The new torque curve (blue line with cross marks) is typically diesel like, strong at the low end of the rpm scale. Its gone up by nearly double the original measured amount, so acceleration will feel incredible (until you get used to it!).
Note how the torque drops off from its peak after 2500rpm as various factors of the engine, and the physical properties of the diesel fuel, take effect. As the torque drops, acceleration slows...by the time the engine is at 4250rpm the torque is at 2/3 of its peak (still far greater than the stock engine though...) you'll still be accelerating, but not as quickly as at peak torque.


Quote:
I really am a car noob so I don't know how far I can rev the car without hurting it.
The engines rev limiter will stop you exceeding the maximum permissible engine speed. So all things being equal you shouldn't 'hurt' the engine.
*If you've got a manual transmission, downshifting into an inappropriate gear could overspeed the engine*

Given the torque & hp curves it really isn't worth going over 4000rpm where peak power is shown in any case.
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