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Re: T-7 High Altitude Upgrades? Any experiences?
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Posted by Dean (more from Dean) on Tue, 18 Jan 2005 08:50:54 Share Post by Email
In Reply to: T-7 High Altitude Upgrades? Any experiences?, Mark in C-Springs, Mon, 17 Jan 2005 14:39:28
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The ECU mods that require that you change the stock 3.0 BAR FPR for a 3.5 BAR unit (Nordic) might have some mixture implications that are worth understanding.

With a T7, the ECU will try to compesate for thinner air by working the turbo harder to achieve the same target charge air flows. So the waste gate will be more closed and the back pressure on the turbine, which can be well over 30 PSI, can be even higher. So the temperature of the compressor discharge will be quite high and the intercooler will have a bigger job to do, but the temperatures can be lower in the mountains and that will help. The amount of residual hot gas in the combustion chambers increases which will make the valves, pistons and plugs hotter. That increased octane demand and speaks all the more to a rich mixture. You wull need to run BPCR7ES11's. Clean injectors will help too. Techron Concentrate will also remove some CC deposits which create hot spots that also increase octane demand.

You should be able to specify that the vehicle lives at high altitude and perhaps get an adjusted software load that will help. Note that Hirsch is based in the Alps, so they know all about these things.



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