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Boss 260 revving high???? 

 

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 Post subject: Boss 260 revving high????
Posted: Mon Dec 04, 2006 2:06 pm 
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Just wondering what your Boss 260s in autos are revving at at 80-100-120km/h. A mates sits at 1800-2200-2400. seems kinda high to me, any thoughts or problems people have had?

 

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Posted: Mon Dec 04, 2006 2:14 pm 
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That would also be up to the gearing, what diff ratio you running?

 

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Posted: Mon Dec 04, 2006 2:35 pm 
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As it is from facory, nothing unusual

 

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Posted: Mon Dec 04, 2006 5:35 pm 
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Sounds about right.
Remember that theres no point in having it still on 1000rpm at 120km when the motor isn't A- operating efficently that low and B- Doesn't have the torque to pull a 1800kg+ car along without having to down shift whenever it meets a slight incline. Dont forget converter stall speed, or the fact it has ~3.7:1 diff gears...

 

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Posted: Mon Dec 04, 2006 7:30 pm 
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Mine currently revs at
80km - 1800rpm
100km-2000rpm
120km-2200rpm
Its a 4spd auto with 3.45LSD gears.

 

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Posted: Sat Dec 16, 2006 2:02 am 
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even with the 6 speed manual mine revs at 2000rpm at 110km/h, but that is with the 18" wheels & 3.46:1 diff , with 17's & 3.7 diff, rpm will raise by around 10%.
the stall speed on the auto is around 2200, so it would be wise to listen whether the lock up is working in the torque convertor, (just sounds like it has a 5th gear if you count em)

 

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Posted: Sat Dec 16, 2006 3:50 pm 
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wow, my el 4L only revs at 1800 at 100k's.

 

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Posted: Sat Dec 16, 2006 4:15 pm 
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yeh but just coz its revving higher doesnt make it inefficient or anything. just depends where it makes its peak torque and power etc..
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Posted: Sat Dec 16, 2006 4:19 pm 
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ef 4.0l sits on exactly 2000rpm at 100kph 4 speed auto and 3.45lsd

 

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Posted: Sat Dec 16, 2006 7:58 pm 
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My 6 speed auto, sits (in 6th)

1250 @ 80
1550 @ 100
1700 @ 110
1850 @ 120

 

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