331 with Paxton 1220 - do I need to upgrade from my 30lb injectors???

[Cobra912]

PLease someone help me. I have a 331 with a nx264HR cam, edlebrock performer II intake, edelbrock heads etc etc, 30 lb injectors and a 76mm Pro-M bullet, Paxton FPR, and a 155lph pump. Car runs like a champ (no wideband or other)

Ran a 12.24 second time out.

Now.........I bolted on an Paxton 1220 SL (6lbs) spercharger and a FMU with 30lb calibration kit. Out of money and cant afford a dyno tune or PMS.

I'm going to throw in a 255lph pump.

DO I NEED to switch out the 30lbs for 42lbs and a new mass air meter? I Know the 30lbs are good up to 400 ponies but does anyone have a similar combo???????

PLEASE HELP!!!

 

[squeak93]

At least 42's.......


Mabye bigger dempending on how healthy the motor was stock and how much boost. Scrap the fmu.

 

[Cobra912]

it has only 2000 miles on it, new build. was hoping someone had a similar set-up because they are varying opinions on this topic. I did a lot of thread searching and it seems people run everything from 24's to 60's. I won't be adding any more boost etc but don't want to have add more money into it.

 

[squeak93]

Then only buy ur injectors once. U can always dial them back if need be but harder to get more flow out of small injectors. 42's should do u if u don't plan any more power.

 

[Cobra912]

no no more power. I know everyone says ditch the fmu - it's a bandaid. But could I get away with 30's and an fmu + bigger pump?.....or am I destined to blow up?

 

[88-378]

30's are fine. But you WILL need a tune!

 

[Cobra912]

30's are fine. But you WILL need a tune!

thanks for input. anyone else? anyone running a 331 with a blower????