RR figures/readings!?
Being thinking about this for a while i know there is a simply answer to this but...
On some rr the operators do the power runs in 3rd gear others do it in 4th gear!But surely the car would be making less power in 3rd gear as the boost will not be as high due to the gearing/load on the engine! Whats the answer :cry::cry:Am i being thick? |
The way i remember is that 3rd will make it read higher because of the gearing.
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Renders RR figures a bit pointless then if it can vary from gear to gear. As long as the car has decent torque and bhp curves and feels good then that would be good enough for me even if an RR figure wasn't what I was expecting.
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The gear that is nearest to 1:1 is used, on some cars thats 3rd and some 4th. On 6 speed cars is more commonly 4th and 5 speed most of the time its 3rd. But thats not a hard and fast rule.
Most modern dynos can have the gear used for the pull in put in to the software to compensate. Whatever gear is used I would think that almost any RR will provide enough load for the engine to reach its preset boost limit. |
Originally Posted by simon170
(Post 3902853)
The gear that is nearest to 1:1 is used, on some cars thats 3rd and some 4th. On 6 speed cars is more commonly 4th and 5 speed most of the time its 3rd. But thats not a hard and fast rule.
Most modern dynos can have the gear used for the pull in put in to the software to compensate. Whatever gear is used I would think that almost any RR will provide enough load for the engine to reach its preset boost limit. |
And some rolling roads only use the figures for transmission loss that is held on file supplied by the makers, they can't actually measure trans losses.
4th is nearly always the closest on 5 speed. tabetha |
Originally Posted by tabetha
(Post 3903132)
they can't actually measure trans losses.
tabetha |
Originally Posted by TiB
(Post 3902789)
The way i remember is that 3rd will make it read higher because of the gearing.
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My Trans losses were over 200bhp on a 2wd:cry:
And the op ran mine in 5th this could be down to keeping wheelspin down:? But in most cases don't they run the car to 60 mph in the gear there going to use as a calibration??? C'mon Martin give us some explaination PLEASE:grin: pAUL |
some rolling roads only use the figures for transmission loss that is held on file supplied by the makers |
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