Ive seen threads here on this topic before ,I mean the threads are older ,I hadnt seen them until recently
Some further investigation on my part :
This is mainly concerned with meg III diesel engines which is what Im interested in:
There seems to be an awfull lot of k9k engines !
Anyway..and this is direct from renault material.
85 bhp K9K F 830 no dpf
90 bhp K9K H 834 dpf
105 bhp K9K G 832 no dpf
110 bhp K9K J 836 dpf
Similarities : Injection system on all 4 engine types was upgraded at end 2008,well yeh with introduction of meg III.There is also some info about an injection system upgrade from ac delco to bosch at end of 2010 ,but I wont go into that
In 2009 the 90 and 110 bhp engine types listed above were supposed to be capable of a max rail pressure of 1650 psi,uprated from 1600 psi,and the injector types /part numbers are supposed to be the same(5 squirts per cycle).
Lets go crazy and assume the 50 psi increase in max rail pressure accounts for the 5 bhp difference on each engine type leaving aside the particle filter.
Earlier in this thread I speculated that it would be more cost efficient for renault to make all internal engine components the same once they had to make "better ones " in the first place.
It seems according to the figures that this isnt the case ,not for the whole range anyway.
Of the 4 engine types listed above ,the 85 bhp one has a compression ratio of 17.6:1 ,the other 3 have a cr of 15.2:1.
This is purely to do with combustion chamber dimensions, it doesnt matter how much the charge is compressed before it enters the combustion chamber.
So it seems to me at least that renault have designated engines sold as 85bhp as the cut off point for "expensive internals".Thats not to say an 85 bhp engine cant be tuned up with a "box" or with increased
pressure,it just seems the 90+ versions may have more headroom.
Im once again "assuming" that 90-110bhp 1461cc engines are the same inside.
I can confirm that my engine is a H 834 of 2011 manufacture(theres a big white sticker on the side of the engine).
Max torgue on these 3 engines is developed at either 1750 rpm or 2000 rpm .(200nm for the 90bhp or 240 nm for the 105 or 110).
Leaving that aside what accounts for the 15 or 20 bhp difference .
2 possibilities or a combination of the 2:
waste management/max pressure.
is located behind the engine and low down on the rhs,The only way I could read the part number was from below thru the rhs front wheelwell.
I stated above that
excess boost seemed to be controlled by a solenoid.
Ive now seen what looks like a pressure operated wastegate,ie the 90bhp
may not be vgt,but I cant be sure.
If there is a pressure wastegate the only option may be a ball and spring valve to increase pressure marginally.
The "electronickery" I havent investigated at all, I may get a can clip.
btw my borg warner part number turbocharger is :
or 5435-971-0028 as they sometimes list it in 4-3-4 form
This part number is close to a lot of turbos for 80-110bhp renault diesel engines,but no ceegar.
ie borg warner doesnt list the part number when I enter it.
If anyone has any info plz post.