new start..383 in 89 tpi
08-23-2015, 06:10 PM
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new start..383 in 89 tpi
bdads here,, new to the forum,,, while I am learning about programing ,could I simply bolt in larger injectors,,use the stock chip to break in a fresh 383 engine before I get my programing done? I have a 1989 formula bird 305 tpi ,,, but am building a 377/383 stroker with aluminum heads and howards roller cam,,,, so far it seems my cam is a little big for this system...and I really don't want to go lower.... its a 530/545 LIFT 233/241 DURATION @.050" 112º LOBE SEP ,,, also is there an updated all in one kit for this type of programing for a beginner to purchase ?? thanx,,, bdads
08-23-2015, 07:27 PM
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Re: new start..383 in 89 tpi
Changing from 19# (stock 305) to 22# (stock 350) = 86% or 14% rich.
Of course, with a hot 383, you won't be using 22s, you'll have to step up to 27# or 30#...
19/27 = 70% or 30% rich... that's 1/3 more fuel than necessary
19/30 = 63% or 37% rich... do you really want to foul your plugs and wash all the oil off the cylinders when you are trying to seat the rings? When the ECM thinks its running 14.7:1, it will really be giving enough fuel for 9.3:1.
08-24-2015, 11:32 AM
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Re: new start..383 in 89 tpi
Retain the stock injectors for the start up and break in. The MAF will report a higher airflow with the larger engine, while the ECM will respond with a larger injector PW.
Once you start to tune the ECM you can go with larger injectors.
RBob.
Once you start to tune the ECM you can go with larger injectors.
RBob.
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