As I clearly stated, traction in the lower gears is an issue. I have already made some improvements in this area but my particular interest is seeing what this engine is capable of. The handling of the Vectra as I have it is good but obviously with 430 odd ft.lbs it is time for 4 wheel drive but that is not practical on this chassis/floor pan nor does it make sense financially.
Spinning the wheels is not a sensible solution ??? Who said it was a solution?
I use my right foot to control the power to the wheels and do not deliberately spin tyres. Such behaviour is infantile. However in the wet or on rough surfaces it is possible to be caught out and the fact that the tyres lose adhesion before full torque is achieved obviously helps the gearbox. I am certainly not advocating spinning tyres.
What would you suggest to flatten the torque curve? The torque is very useful in higher gears where gearshifts become less necessary.
This is work in progress as it has been for less than 2 years. The graphs you have seen are the latest rolling road runs from a further development of this particular turbo so there is lots of room for improvement so please do not be critical. It is a process of evolution.
I am not interested in what the manufacturers do. If I was I would have a standard car and not have the curiosity to find out what works and what does not work. Is that not what this forum is about. The previous torque curve was not peaky and this torque curve will improve with information gained.
I have already greatly improved traction over standard and may improve it further but it is not such a big issue with sensible use of the right foot that it is a big problem.
we all know the usual suspects for building cars with spikey outputs (ford, vw, seat 130/150pd and early 170bhp diesels, although not so much of late) and all know the manufacturers with humble outputs yet quicker cars that put the power down so much better, even with the same engine (jaguars version of the 2.0d, peugeots twin turbo version of the jv 2.2 ford unit, bmw diesels but esp. the 2.0 and 3.0 twin turbo) which goes to prove how sensible mapping and linear, controlled and tractable power delivery produces a real drivers car that won't send you into a ditch every time you press the loud pedal near a corner.
This has nothing to do with me. You have lost me here. I havn't driven any of the cars you are referring to or even know what they are and this is our first small diesel. It certainly doesn't head for a ditch with WOT near a corner.
As for reliabilty, I see your claims and that you don't drive fast, you or your wife.
I do serious trackdays, where the car spends most of its time on either wot (5-7k rpm) or seriously hard braking, I am not sure I would trust such a highly strung unit as this in track car for fear of it not lasting the day, never mind its lack of driveability.
Now you are talking rubbish. I am not a boy racer but where did I claim not to drive quickly. Just where does this come from? Top speed in excess of 160 mph and still climbing, bigger circumfrence tyres so the speedo may be close to accurate, 250 miles last Thursday in not a lot of time. How about Szolnok, Hungary 10:00am to Darlington 03:00 the following morning and there was a stretch of water to cross that affected average speed. Work it out for yourself. I guess this car has done over 100 rolling road runs at RS Tuning alone so think what you like about reliability and if you think I am a slow driver I don't know where you got that from. You are inventing something I have not said. Perhaps you could clarify. Not with this particular vehicle I have done many track days, former winner of the annual Scooby Shootout event, seperately, timed at 186 mph at Elvington and 194 mph at Bruntingthorpe, past European truck driving champion, to name but a few so I might know a little bit about driving and speed. Thanks for sharing your track experience with us but again not relevant as this is not a track day car. I do have a 500 odd bhp car, 4WD, smaller and lighter but that is not relevant either.
What I am doing quite deliberately is increasing the performance of this diesel road car to suit me. What is this bit about driveability. The car has a wider rev range now than it did as standard and I havn't heard my wife complain about a lack of driveability. The average driver would not know this car was other than standard until they put their foot on the floor. The area under the torque curve is substantial compared with the car in OE spec. Have an opinion by all means but do not invent slow driver and lack of driveability and remember I am doing this because I want to and if it doesn't suit you it doesn't matter as you can go off and do your own thing whatever that might be and I have no reason to be critical if you choose an entirely different passtime.
What have 5000 or 7000 RPM limits got to do with me? This is a diesel with a redline at 5000 and best progress is made with upshifts before that point. Petrols, BMW, BTCC, none of this has any relevance to what I am doing.
Did you actually read what I said? I plan to produce the same power give or take a little with less boost. That seems like a step in the right direction to me. How much do you know about turbos? Properly built 2 bar is no big deal for the right turbo and engine but that is a concern to me, the internals because I am in unchartered water but other poeple can learn from what I am doing if they wish. I am heavily involved in specifying and building turbos and I have a fair understanding of what works and what does not, reliability, longevity and so on. I have a record of success.
Like I said I enjoy doing this. It is a voyage of discovery with continual refinement. If it is not something you want to do, do your own thing and enjoy that.
Some photos from my workshop at home this evening.