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The BMW Range
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E39
Increasing performance for 523i E39. Possible?
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<blockquote data-quote="Devillian" data-source="post: 657922" data-attributes="member: 22102"><p>Firstly, I think 2000 model 523i is with the M52 engine. So 170hp instead of 190hp. Am just basing off the model years the engine was introduced, so may be wrong for this case.</p><p></p><p>I would suggest planning out your path first before moving ahead, since certain upgrade would not be required or included in your next stage upgrade. For eg. the ECU tune you are considering, may get you the extra few horsepower now. But if you are going to supercharge it at some point, then it will have it's own tune. So the first tune you do won't be relevant.</p><p></p><p>For headers, exhaust, intake. One thing we've noticed in recent builds is that with a stock engine, this doesn't mean more power. It would mean better response. So when you press the accelerator, it feels less "obstructed". Headers specifically I would warn against changing. Headers that were not designed properly can actually lead to a power loss and horrible fuel economy.</p><p></p><p>The Mercs chose supercharging (not turbos), but could explain why he's peak comes in sooner than your NA. Plus C-Classes are meant to compare with the 3-Series, so it's probably lighter too. I know the E39 was generally considered a heavy car to begin with.</p><p></p><p>So my advice: try getting your engine detailed. You'd be amazed at how much power is loss when the engine internals are blocked up with dirt (soot/burnt oil, etc.). At this point, you'd also better decide your eventual path. Cos you have 3 options:</p><p>1) Bore out the engine. (This would kill off any supercharging/turbocharging ideas for the future)</p><p>2) Add lower CR pistons (Only recommended if you ARE going to supercharge/turbocharge the engine)</p><p>3) Leave it stock (This would still allow for supercharging/turbocharging in the future, but less boost than with the lower CR piston option).</p><p></p><p>If feasible, you could also consider shedding weight off the car. This would be drastic change, but if you can switch the hood,roof and trunk to CF, that would be a weight saving, as well as lowering of your CG. Coupled with a good set of suspension upgrades (incl. sway bars), you'd be great around the corners.</p><p></p><p>Hopefully I helped with my above comments. Basically you need to decide first what you want to get out of the car (and how much you're willing to spend).</p></blockquote><p></p>
[QUOTE="Devillian, post: 657922, member: 22102"] Firstly, I think 2000 model 523i is with the M52 engine. So 170hp instead of 190hp. Am just basing off the model years the engine was introduced, so may be wrong for this case. I would suggest planning out your path first before moving ahead, since certain upgrade would not be required or included in your next stage upgrade. For eg. the ECU tune you are considering, may get you the extra few horsepower now. But if you are going to supercharge it at some point, then it will have it's own tune. So the first tune you do won't be relevant. For headers, exhaust, intake. One thing we've noticed in recent builds is that with a stock engine, this doesn't mean more power. It would mean better response. So when you press the accelerator, it feels less "obstructed". Headers specifically I would warn against changing. Headers that were not designed properly can actually lead to a power loss and horrible fuel economy. The Mercs chose supercharging (not turbos), but could explain why he's peak comes in sooner than your NA. Plus C-Classes are meant to compare with the 3-Series, so it's probably lighter too. I know the E39 was generally considered a heavy car to begin with. So my advice: try getting your engine detailed. You'd be amazed at how much power is loss when the engine internals are blocked up with dirt (soot/burnt oil, etc.). At this point, you'd also better decide your eventual path. Cos you have 3 options: 1) Bore out the engine. (This would kill off any supercharging/turbocharging ideas for the future) 2) Add lower CR pistons (Only recommended if you ARE going to supercharge/turbocharge the engine) 3) Leave it stock (This would still allow for supercharging/turbocharging in the future, but less boost than with the lower CR piston option). If feasible, you could also consider shedding weight off the car. This would be drastic change, but if you can switch the hood,roof and trunk to CF, that would be a weight saving, as well as lowering of your CG. Coupled with a good set of suspension upgrades (incl. sway bars), you'd be great around the corners. Hopefully I helped with my above comments. Basically you need to decide first what you want to get out of the car (and how much you're willing to spend). [/QUOTE]
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