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Absolutely no concern.
The ECU is operating within its defined fuel mapping ranges. If you exceed 15.5 PSI of boost, the ECU does a fuel cut and does not open the injectors.
It is not know whether the fuel cut corresponds to exceeding the limits of the fuel mapping, or whether the cut is an arbitrary limit. Given the computational ability of the ECU, I expect that the mapping is parametric and quite generalized. So my expectation is that the fuel cut pressure is arbitrary. No hard data floating around.
With the Abbott ECU, the limits are even greater. So that demonstrated the built in overhead for the fuel pump and injector duty cycle.
If a fuel pump is worn out or the filter is very restrictive, then I would have some conern. But this would be an issue for a stock configuration as well.
But the issue is not really just about lean mixtures, but destructive knocking. That is why it is recommended to have low restriction intakes and exhaust, clean injectors and combustion chambers, good plugs etc. All of these are pieces of the puzzle. The ECU can lower the boost in a stock system. This is not required unless something is wrong. With an MBC, not having things wrong is your responsibiltiy. Many different turbo charged systems are out on the road without the ability of the ECU to lower boost settings. Generally there are no problems. MBC users have not reported problems other than the fact that they are prone to fuel cuts in cold weather, neccessitating lower settings for the winter. There have been several in-depth posts in the past which discuss those issues. There are many posts about stock systems that will not boost. Go figure...
posted by 208.24.17...
, Thu, 30 Aug 2001 09:45:16
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