85 GT with Miller Woods turbo (Page 2/2) Raydar DEC 05, 10:17 AM quote Originally posted by fierofool: At 190 HP, 6 cylinders, Gasoline, Turbo, 80% duty cycle, you would need 24 Lb injectors or for 220 HP, would require 27 Lb injectors. That's interesting. At ~210 HP, 19s were plenty for my 3.4. (I forget where I got the formula from, but it never ran lean.) Of course, the rules may be different for a turbo. Thanks. (Maybe it was based upon the 80% duty cycle.) The "reading" continues... 82-T/A [At Work] DEC 05, 11:45 AM quote Originally posted by Raydar: That's interesting. At ~210 HP, 19s were plenty for my 3.4. (I forget where I got the formula from, but it never ran lean.) Of course, the rules may be different for a turbo. Thanks. (Maybe it was based upon the 80% duty cycle.) The "reading" continues... Hi Radar, just piggy-backing on some of the thoughts of others here... I'd agree that getting it running first is probably the most important thing, just to make sure it actually runs. My advice would be to go with an aftermarket ECM... just my thought. MicroSquirt has a whole new harness and support for all the things. I have one of those which I will eventually put on my daughter's car, after we've restored the car, just to make sure it's running well with the stock ECM, etc. pmbrunelle DEC 05, 06:37 PM I may have a set of 30 lb/hr injectors I can send you, but I have to look in my stash to see if I still have them (I can only look on the weekend): https://www.fiero.nl/forum/Forum4/HTML/078917.html There is not really a duty cycle percentage limit as such; it is more that you must leave enough time in the cycle for the injector to fully close, and then reopen. I think that 2 milliseconds of not spraying fuel is enough for this. So, acceptable duty cycle depends on RPM, and the number of injections per 4-stroke cycle. The Fiero ECM (and other batch-fire alternatives) for instance opens the injectors twice per 4-stroke cycle, so there's a bunch of time that's spent opening and closing the injector; you should account for this. Raydar DEC 05, 07:09 PM quote Originally posted by pmbrunelle: I may have a set of 30 lb/hr injectors I can send you, but I have to look in my stash to see if I still have them (I can only look on the weekend): Patrick, Thanks very much for the offer. It's very much appreciated. Before you go and dig those out, let me figure out what I'm doing. Those are exactly twice the size of the stockers, so they might be a bit of overkill.