Custom or Kit Turbos?

[CivicSpoon]

The FMU is what the fuel maps are on, if your fuel map is set to only 6-7 psi then you're motor will run like shit (too lean) and you're more likely to get detonation.
I never said the fmu regulates how much psi your turbo kit will run.

[Beyond Imagination]

you tune your fuel according to boost not the other way around. you don't tune your boost according to fuel. you set your boost level and from there you fine tune from the management system. you can't just set your fmu to run at 6-7 psi and expect it to be the same on every engine setup because 6-7psi is different on every motor.

[CivicSpoon]

Ok you're clearly misunderstanding what I'm saying. What I'm saying is that you can't run your turbo at 10psi and have an FMU that has it's fuel maps for 6-7psi; and expect it to run perfectly; even if you tune it. Like i said before it's going to be lean as hell, that's why everyone i've ever talked to and every place I've ever read from says to upgrade your engine management (fuel management) if you're running more boost that your fmu can handle. Infact I've clearly been told and read that you shouldn't be running a kit fmu at all if you're boosting more than 8psi straight out. Maybe you should go back and reread what I've said before because in every post you've claimed that I said something that I infact did not. I never said anything about tuning your car with boost clearly you tune the fuel/air ratio. Let's wait and what you misread now...

[Beyond Imagination]

but that's exactly what a FMU is for is to manage your fuel going into your motor. when you purchase a FMU such as an apexi safc there are no SET fuel maps for it. you use such a device to modify your air/fuel ratio and to change your fuel curve. as for a stand alone unit your fuel curve is done by programming through a hondata/aem ems etc.

[CivicSpoon]

I'm not talking about an FMU as in AEM EMS, hondata, or V-AFC, I was refering to fmu's such as the Greddy blue box, vortech fmu, stuff like that that are preset. That's my fault I should have been more clear on what I ment.

[Beyond Imagination]

misunderstanding since you were talking about kit and i was talking about custom.

[KaMaKaZiPyRo]

So whatever the kit says the psi max is thats wat it is before you have to upgrade your turbo or is that the max the FMU can handle?