hi all, another jabba thread....has anyone tried the boost controller jabba sell? any good?

Yes & yes. What do you want to know?

do you actually use it? or is it up at full most of the time? is it a dial that changes the power? where does it fit on your dash?

There is a control box which is installed in the dashboard, in the vicinity of the fuses. From here, a wire is fed to the ECU through the same "sheathing" as the other wires (there are two bundles). The controller is just a pot, connected by 2-core wire. You can put the pot wherever you want - Jabba will ask you when they come to fit, and you can then move it if you want to (sticky pad is all that's used to secure it in place).

In between the pot and the magic box is a 3.5mm mono headphone-style jack, so you can unplug the pot (at servicing time, maybe?) and then the boost returns to nearly normal. Certainly normal enough for anyone not to be able to tell. If you wanted, you could also create a plug with the desired resistor in, to "fix" boost levels.

Personally, I keep it at about 80% normally, but even lower if I

So does the boost controller override the remap and allow higher boost pressure, or just allow the boost to be turned down from the maximum available from the remap? And how far can the boost be turned down? And why do you turn the boost down to 80% when running on lower octane fuel? Surely the remap - and knock sensors if necessary - cater for that?

PS: All of my questions bar the last two are answered by Jabbasport here:

http://www.jabbasport.com/boost.html

I must say that it sounds excellent value for

If you think of standard boost as the minimum and the maximum as the remapped boost, you can control the boost setting between these 2 points.

In some circumstances a lower boost level may actually give better response e.g. hot ambient temperature or lower octane fuel.

May not be absoutely accurate but that's the way I think of it anyway;) ....for more details use the link Denis posted.

Originally posted by DGW in this post

So does the boost controller override the remap and allow higher boost pressure, or just allow the boost to be turned down from the maximum available from the remap? And how far can the boost be turned down? And why do you turn the boost down to 80% when running on lower octane fuel? Surely the remap - and knock sensors if necessary - cater for that?

Yes, if you imagine your full remap as 100% and roughly pre-remap as 0%, you can choose anything inbetween.

If you run at 100% on a boiling hot day with 95RON fuel, what seems to happen is that you get a huge surge on full acceleration and then something notices heatsoak / knocking and reins power back in to a safety range. Way below what's possible. So if you set a sensible boost in the first place, the engine never has to cut the power.

At least that's what I think. Maybe Jabba / Mike will clarify?