I'm planning on upgrading to GSC S1s in the spring, and they told me I should upgrade to 780s when I get the cams installed. So, I came on here and did a search and got a lot of mixed info. Basically I just need to know if I'm going to need to upgrade the injectors for the cams or not... current engine mods are below...

-BR 3" TBE (no cat)
-BR FMIC and LICP
-Forge BOV
-Hallman MBC @ 23psi
-Walbro 255 pump
-K&N cone style air filter
-AMS tune - 307whp/300wtq

 

assuming 93 octane?

you will probably be close to maxing out the stock injectors

do you definitely need to upgrade that depends...you have see what your idc is

 

so i had a question concerning somewhat of the same question.. s1 cams + green turbo, and i was in the market for injectors.. is there any downside to choosing too large of an injector (780/880) cos i know with smaller you can obviously max it out, but is there a problem running too big?

 

On a Green the 780s are about perfect for A LONG time. This is what I personally ran and recommend. For the stock turbo car from Jackyll, the stock injectors and a 255 will feed the fire toward the mid to high 300s before its done. The cams will be more power, but not totally eat up all the injector you have left...especially at 307whp.