Date: Sun, 31 Oct 2004 16:55:34 GMT From: Paul Halliday <pjghnospamyonder.co.uk> Subject: Re: Manual Boost Control Valve Kick --why?
in article v5v9o0921nhtf9f3nl4mc58jktcpp6oa5mnospamcom, Retro Bob at nothingherenospamcom wrote on 31/10/2004 16:04: > I'm going to avoid the flame war here by not quoting anyone... Likewise :) Well said Bob. As a general matter, increasing the power of a car beyond the specification of the manufacturer is at the owner's risk. The main points of failure due to increasing power on turbo cars in general are cracked pistons; and on SAABs, the gearbox. Using an MBC and losing knock protection is a risk. So is using an ECU. I know of at least one classic 900 that uses the hallowed APC system simply for knock sensing and therefore if the LED flashes, the driver knows something is amiss with his MBC setup. He can use that information to re-tune the system. I also know of at least one classic 99T that uses APC to increase power "safely" above and beyond the 140? BHP that the 99T was set to as standard. There's a moral in both of those tales somewhere. Certainly the NG900 and the 9000 tuners seem to champion MBCs for power increases - perhaps the DI setup was not that advanced, but I think T5 and above SAABs should go the ECU route, rather than MBC - the ECUs are doing too much to negate their functionality with an MBC. It's like taking a microwave oven and lighting a fire underneath it :) The Abbott tuning equipment is of a very high standard (and so it should be for the price!!!) and I know that the stage upgrades are sold as kits - you get an ECU chip, but ECU setups of a certain power upwards are sold with exhaust upgrades and air intake upgrades. Likewise, the Speedparts kits. If the car in question has an Abbott upgrade in place, ditch the MBC!!! Simple. NG900s and early 9-3s do benefit from an improved intercooler and that in itself will give a good power boost. Oh, as for hitting the fuel cut off switch ... Well, erm ... (Looks both ways) ... that's the first thing classic 900 tuners bypass :P