Originally Posted by Jarkko.Männistö
Volvo 2.4 uses integraded exhaust manifold. the turbo is not very good for upgrade 159 2.4 turbo. ( not big enough )
Bmw uses non integrated manifold, and bigger wheels on the larger turbo, that is much better option. the standard compressor wheel is 50mm / 70mm on that.
but still, with 2.4 engine, I would go for Bmw 3 liter diesel newest 10 blade wheel gtb2260 turbo. good for around 320-330hp.
This has all been done before....and you don't need a twin turbo for 300bhp+...
In fact, the (standard turbo for a 210) gtb2056vk will already get you to 300bhp.
Have a read through my thread - might give you some ideas.
cheers guys. I am having a good read through all the posts, particularly those in your tune up section Clogz. getting some good ideas, and like I say still very much in the planning phase at the moment.
I am pretty new to diesel tuning, so am applying my limited knowledge of petrol tuning to what I plan for my beloved 159.
so far my ideas/plans are as follows
the twin turbo mod as already mentioned. while I understand I don't need the 2 turbos for 300hp, I feel it would give a better power curve through the rev range. 300hp isn't so much a goal, I would be happy with 270-280, its more that I don't particularly want to exceed 300, and the increase in torque would be substantial, and as I understand from previous posts this is possibly the upper limit for the drivetrain. the car is still to be used as a regular vehicle not just a toy. plus increasing the final turbo size, the addition of a smaller turbo spooling up quicker to give boost in the lower rev range, and reduce any possible turbo lag.
again not knowing too much currently about the insides of the 2.4, and you guys on her may be able to clarify some of these...
bore out cylinders, to increase displacement to 2.5l. I have read that the cylinder bore is 82mm dia, so boring out to 83mm dia, if permissible by the wall thickness of the cylinder should increase displacement enough. either that or possibly a crank with a longer throw on the con rod journals, and a thicker head gasket to maintain the compression ratio to 17:1.
head work...can bigger valves be machined into the head? in the past I have had bigger valves fitted to petrol engines, along with head porting and matching to the manifolds to allow the whole system to breath better. this alone on a petrol engine gives great improvement, so I figure as a diesel likes lots of air it should work here too.
bigger throttle body, again allowing it to breath better.
bigger intercooler, injectors, increase fuel rail pressure, stainless exhaust, re map and induction kit.
have been looking into performance cam shafts but as yet not found any to add to the list.
water methanol injection seems to be quite popular on here. not really what I am looking into. would like to just do a full re set up and re map with more precision made components to see what it gives me.
like I say a lot of planning at the moment, and may possibly try to get hole of a 2.4 jtdm lump to work on so my car remain on the road while all this gets done then just drop the tweaked engine in...
any and all recommendations, links to assisting posts or further tweak ideas welcome. this is a long run project idea so what do people think?