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My car is stock except for shorty headers, O/R H-pipe, flowmaster catback and underdrive pulleys. How rich will my car run with the FMU supplied with the blower and will it be to rich to run the car all spring summer and fall like that?
Next winter i'm gonna ditch the FMU and run 36lb injectors and 75mm Pro M
Should be ok if you have the stock 19lbs. Better too rich then too lean. If you think your running too rich you can always recalibrate the FMU with a 10:1 disc instead of the 12:1 supplied with it for about 30-40$
Simon
FMU only works under boost so your usually ok. If it is to rich on WOT you can always change the disc or add a fish tank valve in the vacuum line of the FMU to adjust its action.
Can you elaborate on this?Quote:
Originally Posted by speedytang
If your to rich under WOT you can cut the boost back to the FMU by using adjustable air valve like used with a aquarium. The Super FMU by Vortech used this technique except it was manufactured into the top of the unit at the vacuum nipple. For those that did not have the money for new injectors and used a FMU I have always used this method instead of replacing the disc unless the A/F was just so far off that the lower disc was the only solution. Tuned Turbo cars like this also back in the 80's when no other solution was made yet. The best solution is always matching the injector size to the car output.