2nd Generation Specific 1986-1992 Discussion

Tunning Question

Old 03-06-2006, 08:35 PM
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im going from the stock 550cc injectors to 720 and 1600 CC injectors and a walbro fuel pump now my question is after i change the injectors and the fuelpump will the stock FPR work and will i have to re adjust my fuel map on my ecu.
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Old 03-06-2006, 08:56 PM
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Stock Fpr Should be changed and yes the ecu will have to be hacked/replaced
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Old 03-07-2006, 06:45 PM
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I already have a standalone ecu but will my tunning be alot diffrent from what i have now
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Old 03-07-2006, 11:28 PM
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Originally Posted by RX7 13B 4 UR AZZ' post='806518' date='Mar 7 2006, 04:45 PM

I already have a standalone ecu but will my tunning be alot diffrent from what i have now


yep
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Old 03-09-2006, 12:35 AM
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To rough in the tune you can approximate the on time by looking at the injector size. Assuming you keep the rail pressure the same you'll have about 25% more capacity on just the primaries and 100% more capacity on the combined primary and secondary injectors. Again, assuming rail pressure is unchanged from the previous setup you should be able to take out 25% from the primary map and halve the secondary map. It's easy to go through the 2D maps, on a Haltech anyway, and make changes by percentage. For safey sake leave yourself a margin of error. At this point you'll need to do the actual tuning but you should be in the ballpark.
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