i have a problem with boost spikes on mine came make it do it if i throttle hard approx 2200 revs.
some days ok some not. Doing my head in.
At minute mine is very dosile until 2300 revs then torque comes in really sharp
which is ok when just pootling about but when pushed it really does overboost quite easily
I need to get torque smoothed out and to come in earlier. I'm not fussed about big numbers
No good having a car that spins it's wheels everywhere and eats tyres.
Our family wagon (Volvo V50 D5) is lovely and smooth but bags of grunt. Would like it to be more like that
rather than like an unpreictable teenager on redbull and blue smarties
Excuse me for being ignorant, but if say I did a data logging session where by I applied power gradually until the redline then may I not get the overboost and awful spike? I thought with the data logging you were meant to do with the throttle wide open from as low down as possible until the redline?
You can data log under all conditions, part throttle, WOT light load full load, you can replicate all conditions and read the info off. Most people log via a WOT sweep test so then can build up graphs.
In your case with your issues your best way to gain data is under extream conditioins, 4th gear WOT from 1600rpm to around 3200rpm to capture the data where the overboost happens.
As for pipes, I have only seen issues with the valves removed and only log and test with them in place as they should be, so I can only advise to replace all the vac pipes and valves back in line and just plug the anti shudder and egr line. The VNT vac control is very sensitive. You need to fix the hardware so the actual boost matchs or gets close to what the map is asking for. I may take a little time to sort, but will be well worth it in the end.
Nick
