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6 speed gearbox conversion
#21
I find my B9 is quiet and peaceful at 70, doing just below 2500 rpm. It is a quiet engine anyway, purring away at idle with very little noise when you are outside it. One thing I did notice when making swift progress to catch the rubbish tip for my appointment (the joys of covid restrictions) is that as soon as the engine crosses 3k rpm it turns into a sharp snarling combustion sound like the older ford tdci engines used to. I also had a pug 406 that did the same but at much lower rpm.

I'm sure it's because it stops the pre-injection phase above 3k rpm, and goes for full injection straight away on every cycle so the noise goes up a great deal. Pre-injection involving squirting 1 cubic mm of diesel just before the main injection makes the combustion sound much softer and immensely quiet.
My Van: 2012 B9 1.6 HDi Enterprise
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#22
I have just sold my KIA 1.6D which had a 6speed box, i'll admit that 6th gear is a kind of overdrive but i would have said slightly less in ratio as it pulled in 6th.
It did however make a massive difference in MPG, i could easily get 60mpg and even 72mpg a couple of times.

I now have a Berlingo 2013 1.6 D and have to say that at 70mph in 5th it's at about 2000rpm and i get a return of high 50s MPG.
I don't think this is bad for a vehicle that has a profile of a brick, the Kia was very slippery in profile in comparison.

Many years ago i worked at a place that made standby genny's, the tech guy on the engines there said that diesels have a sweet spot at 1500rpm. I have had a few diesel cars and have to say that they have all seemed happy around this RPM.
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#23
Have a look at differential ratios, it might be an easier route than a gearbox swap unless you just want more gears.

hawkeye Wrote:Many years ago i worked at a place that made standby genny's, the tech guy on the engines there said that diesels have a sweet spot at 1500rpm.

That was old fashioned diesels like the 1.9 non turbo not the Hdi models which are much higher revving.
So where does this bit go then ?
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#24
That was because the engine makes peak torque at a specific rpm such as 1800 or 1500 so on a diesel gen set, you adjust the idle control to get the engine to sit there under load at all times. Peak torque point depends on the actual engine brand.
My Van: 2012 B9 1.6 HDi Enterprise
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#25
(20-11-2020, 09:48 AM)hawkeyefxr Wrote:  I have just sold my KIA 1.6D which had a 6speed box, i'll admit that 6th gear is a kind of overdrive but i would have said slightly less in ratio as it pulled in 6th.
It did however make a massive difference in MPG, i could easily get 60mpg and even 72mpg a couple of times.

I now have a Berlingo 2013 1.6 D and have to say that at 70mph in 5th it's at about 2000rpm and i get a return of high 50s MPG.
I don't think this is bad for a vehicle that has a profile of a brick, the Kia was very slippery in profile in comparison.

Many years ago i worked at a place that made standby genny's, the tech guy on the engines there said that diesels have a sweet spot at 1500rpm. I have had a few diesel cars and have to say that they have all seemed happy around this RPM.

Now I think about it mine is probably just around 2350 RPM at 70 in 5th but still quiet anyway.

I see HDi Tuning have reduced their stage one remapped ECU package to £180 so I'm going to get on with buying that at last. Was £235 a few months ago. 120hp will be much nicer than 75hp when pulling uphill in 3rd onwards.
My Van: 2012 B9 1.6 HDi Enterprise
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