# How each engine really differs.

**URL:** <https://forums.speedlife.net/t/how-each-engine-really-differs/258912>\
**Category:** Shift518 Automotive\
**Created:** [June 13, 2011, 2:56pm UTC](https://forums.speedlife.net/t/how-each-engine-really-differs/258912 "2011-06-13T14:56:07Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![Vovchandr](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/vovchandr/32/6275_2.png) [@Vovchandr](https://forums.speedlife.net/u/Vovchandr)\
**Post date:** [June 13, 2011, 2:56pm UTC](https://forums.speedlife.net/t/how-each-engine-really-differs/258912/1 "2011-06-13T14:56:07Z")

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The only variables between two motors and their HP and TQ DYNO charts and output realistically are just TQ and how high they can rev.

The TQ chart will determine what the HP chart will look like, so if two motors are made similar enough to produce similar TQ curve, no matter what it is, turbo, NA, I4, V8… their HP charts will be identical.

With that said, how the NA engine is designed, whether it’s a V8 or a turbo 4 will dictate what the TQ curve looks like accordingly.

\*submit graphs.

Also high revving is a huge benefit of smaller motors, since with the same TQ output, if you double the REV’s you will double the HP figure.

\*meh

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**Author:** ![Cossey](https://avatars.discourse-cdn.com/v4/letter/c/3ec8ea/32.png) [@Cossey](https://forums.speedlife.net/u/Cossey)\
**Post date:** [June 14, 2011, 12:35pm UTC](https://forums.speedlife.net/t/how-each-engine-really-differs/258912/2 "2011-06-14T12:35:24Z")

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No.  
I’m sure Adam would have a field day with this lol.

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**Author:** ![Vovchandr](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/vovchandr/32/6275_2.png) [@Vovchandr](https://forums.speedlife.net/u/Vovchandr)\
**Post date:** [June 14, 2011, 9:31pm UTC](https://forums.speedlife.net/t/how-each-engine-really-differs/258912/3 "2011-06-14T21:31:18Z")

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Are you disagreeing that engine with identical torque curves will have identical hp output?

Keep in mind, only TQ is measured, HP is calculated.

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**Author:** ![Cossey](https://avatars.discourse-cdn.com/v4/letter/c/3ec8ea/32.png) [@Cossey](https://forums.speedlife.net/u/Cossey)\
**Post date:** [June 16, 2011, 4:59am UTC](https://forums.speedlife.net/t/how-each-engine-really-differs/258912/4 "2011-06-16T04:59:39Z")

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> [@HAPPY BIRTHDAY MICAH](https://forums.speedlife.net/t/happy-birthday-micah/43056/4):
>
> Are you disagreeing that engine with identical torque curves will have identical hp output?
> 
> Keep in mind, only TQ is measured, HP is calculated.

Mostly the last part. Doubling the rpm the vehicle can rev to will not double the power. Look at x car’s dyno and see if the hp is 1/2 peak power when the rpms are 1/2 of peak power rpms.

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**Author:** ![Vovchandr](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/vovchandr/32/6275_2.png) [@Vovchandr](https://forums.speedlife.net/u/Vovchandr)\
**Post date:** [June 16, 2011, 2:30pm UTC](https://forums.speedlife.net/t/how-each-engine-really-differs/258912/5 "2011-06-16T14:30:38Z")

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I didn’t say that doubling the limit will do that

I was implying that 200tq at 4000rpm is the same HP output as 100tq at 8000rpm.