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i thought alpha n didnt need to know manifold pressure? i thought it was purely a tps thing ( the bosch ecu doesnt have a manifold pressure sensor and these guys are getting it done with just the oem ecu). if you are going stand-alone fueling then yeah run a pressure sensor in conjunction with tps. i could see how tuning from just tps could get very on/off (trying to use a 0 to 5v signal to calculate fueling over a 7000 rpm range - this is why the stand-alone units use the pressure signal as well) but ive driven my car in limp mode, which is presumably just running on tps, and it is quite responsive. but i could see a lot of finesse and tuning being required. and no idea how youd fit it in a boxster.
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