Which turbo can I get away with

Printable View

Show 40 post(s) from this thread on one page

12th August 2009, 11:10 AM
Bush65

Quote:

Originally Posted by isuzurover

AFAIK all factory (LR) 4BD1s have a max rpm of 3400 (or thereabouts).

Have you balanced your engine to get it to rev to 4400 smoothly???

Some data for governor calibration of the truck version, gives engine revs as 2500 to 3000.

Yes, my engine has been balanced and IP is at a shop for adjustments.
12th August 2009, 02:01 PM
isuzurover

Quote:

Originally Posted by Dougal

Mine appears to be 3600rpm. Confirmed through checking gearing and road speeds.
Mine was fully balanced, but it's still fairly noisey and grumbly above 3000rpm. Spends most of it's time between 1500 and 2000rpm.

That's how I got 3400 on the ones I have driven. Found where you hit the governor in 3rd gear and calculated based on actual road speed.

No guarantees your pump hasn't been adjusted at some stage...

I find mine doesn't like to rev above 3000 rpm as well. Mine hasn't been balanced though.
12th August 2009, 03:14 PM
dobbo

Quote:

Originally Posted by Bush65

What is your max rpm?

Dunno I'll have to find out
12th August 2009, 06:47 PM
rovercare

Anyone got a link to a decent calculator, I'm trying to find one:(

140km/hr, engine governor, 4th 1:1, Tx 0.996:1, final drive 3.54:1 on 35" tyres, rpm is ??
12th August 2009, 07:47 PM
B92 8NW

Quote:

Originally Posted by rovercare

Anyone got a link to a decent calculator, I'm trying to find one:(

140km/hr, engine governor, 4th 1:1, Tx 0.996:1, final drive 3.54:1 on 35" tyres, rpm is ??

2945 rpm by my calculation, but that seems incorrect.
12th August 2009, 10:55 PM
isuzurover

B92 8NW is correct. Seems like yours is governed at a measly 3000rpm.

To calculate for yourself:
35" x 2.54 / 100 = 0.889m * pi = 2.793 m = circumference of your tyre

140 km/h / 60 =2.333 km/min * 1000 = 2333.3 m/min

2333.3 / 2.793 = 835.5 rpm at the wheel

835.5*3.54*0.996 = 2945 ~ 3000 rpm at the wheels.

See that maths you learnt at school was useful for something ;)

Btw - as a sparky you should know that AC power wouldn't have been possible without Rafael Bombelli defining imaginary number theory in 1572. Which was considered at the time a pointless excercise in pure mathematics - most of his colleagues took tghe **** out of him.... Imaginary numbers are things like SQRT(-1)
13th August 2009, 06:23 PM
rovercare

Quote:

Originally Posted by isuzurover

B92 8NW is correct. Seems like yours is governed at a measly 3000rpm.

To calculate for yourself:
35" x 2.54 / 100 = 0.889m * pi = 2.793 m = circumference of your tyre

140 km/h / 60 =2.333 km/min * 1000 = 2333.3 m/min

2333.3 / 2.793 = 835.5 rpm at the wheel

835.5*3.54*0.996 = 2945 ~ 3000 rpm at the wheels.

See that maths you learnt at school was useful for something ;)

Btw - as a sparky you should know that AC power wouldn't have been possible without Rafael Bombelli defining imaginary number theory in 1572. Which was considered at the time a pointless excercise in pure mathematics - most of his colleagues took tghe **** out of him.... Imaginary numbers are things like SQRT(-1)

Maths I learnt at school:eek: I learnt more life skills than anything:D failed year 10 then left:(

mmmm, must up the governor setting:twisted:
14th August 2009, 06:08 AM
Dougal

Quote:

Originally Posted by isuzurover

Btw - as a sparky you should know that AC power wouldn't have been possible without Rafael Bombelli defining imaginary number theory in 1572. Which was considered at the time a pointless excercise in pure mathematics - most of his colleagues took tghe **** out of him.... Imaginary numbers are things like SQRT(-1)

If he'd called it something other than "imaginary" there may have been less urine extraction.:D
14th August 2009, 07:01 AM
slug_burner

Quote:

Originally Posted by isuzurover

B92 8NW is correct. Seems like yours is governed at a measly 3000rpm.

To calculate for yourself:
35" x 2.54 / 100 = 0.889m * pi = 2.793 m = circumference of your tyre

140 km/h / 60 =2.333 km/min * 1000 = 2333.3 m/min

2333.3 / 2.793 = 835.5 rpm at the wheel

835.5*3.54*0.996 = 2945 ~ 3000 rpm at the engine.

See that maths you learnt at school was useful for something ;)

Btw - as a sparky you should know that AC power wouldn't have been possible without Rafael Bombelli defining imaginary number theory in 1572. Which was considered at the time a pointless excercise in pure mathematics - most of his colleagues took tghe **** out of him.... Imaginary numbers are things like SQRT(-1)

minor change for clarity
14th August 2009, 07:47 AM
isuzurover

Quote:

Originally Posted by Dougal

If he'd called it something other than "imaginary" there may have been less urine extraction.:D

Actually I think it was his detractors which coined that term.

Thanks slug_burner

Show 40 post(s) from this thread on one page