I know this will probibally be pretty elementary to most of you guys, but i was wondering what is the biggest size secondary fuel injectors that is sugested for a daily driver? I was thinking about upgrading to 850cc fuel injectors for the secondary and keep the 550cc injectors for the primary, can i go bigger on the secondaries? Or is 850cc injectors not reliable??

 

No matter what if you're upgrading your secondaries you'll need something to control them with. That being said, depending on what you control them with will depend how big you can go. People run 1600cc secondaries with standalone (no problem at all) and don't have any drivability problems.

All depends on your intentions and what direction you're going with things. With an s-afc or e-manage I've seen 720's and 850's used quite a lot to control it and people don't have problems.

 

So can i put 850's into my car with a stock ecu? I thought any major mods would require a new EMS. I would rather put a s-afc into my car then spending $1,000 into my car for a new ecu if i can. If i get i new turbo later would i need an EMS to run that though? If im going to need a new engine management system i would rather do things right the first time.

 

I wouldn't go much more tha 720's if you are using an SAFC to control your fuel...

the BEST way to add fuel and keep the stock ECU and add fuel is to use an additional injector controller, and have injector bungs welded onto the UIM....

That being said.. I run a Haltech with 550's and 1600's..... I about to switch to Quad Marren 1000's because I feel the need to spen money and retune my car like a dumbass.