Bosch 380cc Injectors

[brunobox]

I've read that 380cc injectors are not ideal for our cars (vs TT225 386cc), due to the differing spray patterns. Problems with rough idling and cold weather starts seem to be the main reported issues. At the same time, there are a few tuning companies which have maps for these less-than-ideal injectors (Eurodyne is one).

Is the different spray pattern really something that can be fully compensated for with a map?

Is there anyone out there running 380cc injectors in colder climates (I'm in Upstate NY), with matching maps who could chime in on their experiences with them? Any problems come winter?

[old guy]

You gotta ask yourself if it is worth it in the long run to save a few $$ up front for the potential of having nagging performance issues for the life of your car?

[vvenom800tt]

Get the 550cc mustang gt injectors. Dual cone spray pattern and only $240 for 8 of them.

Unless youre not running motoza youre gonna be stuck with the 380cc - 386cc ones.

[diagnosticator]

I've read that 380cc injectors are not ideal for our cars (vs TT225 386cc), due to the differing spray patterns. Problems with rough idling and cold weather starts seem to be the main reported issues. At the same time, there are a few tuning companies which have maps for these less-than-ideal injectors (Eurodyne is one).

Is the different spray pattern really something that can be fully compensated for with a map?
Is there anyone out there running 380cc injectors in colder climates (I'm in Upstate NY), with matching maps who could chime in on their experiences with them? Any problems come winter?

There is no way to tune to compensate for fuel mixture variation occurring in different conditions, caused by injectors with non optimized spray pattern, except to over-fuel, run richer than necessary to avoid lean misfires.

Besides the dual cone spray pattern, with the specific cone angles and cone separation optimized for the three valve intake layout used in the 1.8T, (each spray cone is directed to one of the outer intake valves,) the TT225 OE Bosch injectors have the extended spray tip specifically to minimize fuel spraying onto the intake runner walls, considering the increased fuel spray volume compared to the 270 cc/min stock AMB injectors. When fuel sprays onto the intake runner/port walls, it is very difficult if not impossible to accurately control fuel mixtures as temperature of the intake air and intake manifold absolute pressure varies with outside ambient air temps and engine load. If there is a variable amount of calculated fuel mass injected trapped on the intake runner walls, that evaporates in an uncontrolled fashion regarding rate and time, then the in-cylinder air/fuel mixtures will be likewise uncontrolled in effect, regardless of the accuracy of the fuel mixture control capability employed by the ECU. What do you think, is the price difference worth the compromised fuel delivery that results from using the 380 cc/min injectors?
As a matter of correct technical application, I don't believe there is an option to the TT225 injectors for that specific fuel delivery capacity. Most driver's would not notice the difference in the engine running qualities and drivability, even disregarding cold start ups, however I would. Not mentioning the relevant details of other aspects like fuel economy and emissions.

BTW, Welcome to Audizine!