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| 2.8 rod bearing wear (Page 2/2) |
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pmbrunelle
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MAR 09, 02:02 PM
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At any given speed, selecting the gear that maximizes whp maximizes vehicle acceleration.
If your shift RPM is too high, then you are spinning the engine for too long where it is not breathing.
If your shift RPM is too low, then your RPM after the shift will be too low, where the engine is not powerful.
If your shift RPM is optimal (for acceleration), then the engine will generate the same horsepower before and after the shift.
From the chart I linked to, and assuming M17 gearing, these are the optimal shift points for acceleration:
1-2 shift: 5100 -> 3000 RPM, 82 whp before and after the shift
2-3 shift: 5000 -> 3108 RPM, 88 whp before and after the shift
3-4 shift: 4900 -> 3200 RPM, 90 whp before and after the shift
4000 or 4600 RPM as shift points are fine if you want to maximize engine longevity, but you will be missing out on acceleration, at least with an engine that behaves like in the graph I linked to.
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olejoedad
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MAR 09, 02:37 PM
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Max torque is at 3600 rpm.
Torque is acceleration, horsepower is how big a hole you can punch in the air at top end.[This message has been edited by olejoedad (edited 03-09-2025).]
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saving_rossi
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MAR 09, 04:00 PM
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Did my homework as soon as I left the thread, I’m not trying to break the distributor drive gear. I’ll probably stick to the OG pump
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