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koke'sfocus 02-06-2012 01:14 AM

42lb inyectors or 60lb?
Hey I'm making my own turbo kit I have almost everything, I only have two Qs? I'm installing a super 60 stage 3 turbo I'm going to put a 3inch downpipe with 3inch exhaust cutout, knock off intake manifold,and 42lb inyectors my engine is stock but I'm trying to get the most out of it should I get the 60lb inyectors? I'm gonna push only 12 psi and the other question is my waste gate have 2 springs inside should I take out one?

Thanks in advance
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FocusBoy58 02-06-2012 02:51 AM

2 springs means it will be 14psi from my experience unless its a stupid strong spring. so yes take it out and get a boost controller. Also go with 60 pound injectors so you wont have to change them when you want more pooowwwwaaaa later.

Also sounds like that turbo is going to be way to big for what your going to be doing.

1turbofocus 02-06-2012 06:44 AM

You need to run the spring/spring combo to make your target boost , I would also go with the 60lb Inj


koke'sfocus 02-06-2012 09:35 AM

Tom do u think is the turbo is way to big? And so should I leave both springs? I know one is for 14 psi and the other is 7 psi I think
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Dgc333 02-06-2012 01:37 PM

Can someone educate me?

If you are only running 12 psi of boost why would you want a 60lb injector?

My years of Mopar 4cyl turbo experience the T2 engines that ran 12 psi of boost stock came with 30lb injectors and full Super 60 setups with cams and head work that ran 18 psi only used 50 lb injectors.

I would think that ecu would have a hard time throttling down a 60 lb injector for off boost driving resulting in the engine being overly rich.

Rod H 02-06-2012 02:58 PM

Here's a simple injector size calculator. The size injector you need is based on the horsepower your going to make. The BSFC is greater for a turbo/SC than a NA engine so be sure to take that into consideration.


Jgrove998 02-06-2012 07:24 PM

1 Attachment(s)
I'm using 42lb injectors in my ST.

Your sure the springs aren't one=7 psi and the two combined=14 psi? To hit your target boost you will want to use the exact spring or a spring that is rated lower than the target boost and then use a boost controller to up it to your target pressure. You cannot get a lower boost pressure than what your spring is rated for.

koke'sfocus 02-06-2012 07:53 PM

one is 7 and the other 14 i think one i longer than the other one so i should only use the longer one right? is less stiff

1turbofocus 02-07-2012 08:24 AM

I would do the 60lb hands down , the ECU can do 130+lb Inj and drive and idle like stock thats all up to your tuner and how good he is

The T3 S60 STGIII should work very good for you


koke'sfocus 02-07-2012 01:19 PM

Ok thanks tom and everybody :)
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