My friend's FD will not idle, or run well at all after the switch over to 850 primaries. We've got the PIM voltage changed correctly and are using a 64.5 primary injector correction along with a .04 lag correction.

I just went outside and it is now ideling and reving, but it is rich as HELL everywhere. Billowing white FD smelling exhaust. Is there anything else we should check? We also have the PFC injector size set to 850.

We're all really at a loss as to why it's so rich. I know it won't be perfect, but it should at least be running a little less rich than it is I would assume.

Mods are: Full 4" exhaust, large single turbo (I'd give more specifics, but I have no idea what kind it is, as he's kind of fed up with working on the car and won't tell me ) and a street port. I think that's about it as far as major engine mods go.

Any help would be great guys, thanks a lot.

 

Also, the rats nest has been removed. But it was running fine before and after it was removed. (with the 550s)

 

The 850 idle problem has been documented and discussed here for years.
If you can't lean it out with the base map set low, and reduced fuel with the PIM RPM and Voltage tables; you have 1 option and 1 thing to check.

(1) make sure that your base fuel pressure (0 psi vacuum/boost) is no higher than 40 psi.
(2) Reduce lag to lean out some.

 

Did you modify the primary injector rail??

 

I don't think the rail was modified, but I know that the injectors we're using had to use a different o-ring than they came with to snug them into the rail. My friend rx7weee says that he has done the same thing, so I'm not too worried about it.

 

What broken Apex is trying to ask is, is there a way that fuel is leaking into the engine when it is running due to the fuel injectors not seating them selfs right.

I have found this problem before while working on a friends