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Bullet 7 01-09-2019 05:32 AM

Ferrari 456 Torque Loss
 
Hi
I have just had my 456 tested on a rolling road and it is producing a lot less torque than the quoted Ferrari figure - 312 lb/ft vs 398 lb/ft, I appreciate that my car is over 25 years old now but that is quite a lot, plus it appears to be over fueling and running really rich as the engine speed increases during the test, does anyone else have a similar problem? I am running 5.2 ECU's and I have had the system checked by the on board diagnostics and everything appears to be running fine and a compression test shows all the cylinders to be aligned. Its just losing that 'killer' feel.

tazandjan 01-09-2019 09:17 AM

Drivetrain losses on dynos are 15-20%, more with an automatic. 20% loss is close to what you are showing, 21-22%.

David @ FluentInFerrari 01-09-2019 01:14 PM

Quote:

Originally Posted by Bullet 7 (Post 733153)
...it appears to be over fueling and running really rich as the engine speed increases during the test.

What was the AFR recorded during the dyno run? This would be quite revealing...


Quote:

Originally Posted by Bullet 7 (Post 733153)
I have had the system checked by the on board diagnostics and everything appears.

This contradicts your first observation. Just because there's not a code set doesn't mean there's not a problem. Any chance fuel trims were observed?


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