I was wondering if anybody could put my mind to rest on a few things. I've got a 20v jtd (156) and after fitting my boost gauge I've observed that on cruising the boost never sits any lower than around 0.4bar...I know it'll never make below 0 as it's a diesel but is it normal for it to always be on boost even with minimum throttle?
The other thing is I've noticed if I'm moving up through the gears with say half throttle there is a noticeable change in boost characteristics at roughly around 2250rpm and at this point there is also a notable difference in the sound of the engine/exhaust...it abruptly becomes deeper like it's suddenly stepped up if that makes sense?! If anybody has driven a Honda vtec it's like that as the revs hit a certain point and the vtec changes the cam profile....
Probably these things are normal but I'm hoping somebody can confirm theirs does the same. It's been like it since I've had it. There is no loss of power at all and the boost/throttle response seems spot on. I had a rolling road session on it before I touched anything and it came out as 168bhp & 305lb/ft. It seems to boost up to around 1.3bar of pressure in 3rd or 4th gear...
Anyway I'm fairly happy with my first Alfa experience so far! I've got a downpipe back sports exhaust and a ram air maxflow filter on custom pipework from the turbo. I've obviously done the boost gauge and I've blanked the EGR, all in preparation for my remap
only problems I've had is a dud thermostat which I promptly changed and having to grind down the entire underneath of the passenger compartment floor as Alfa saw fit to only put paint on a lot of it instead of some kind of underseal
so that's all been redone for the future