Forced Induction Injector size for supercharger

[GreyMare88]

I was wondering what typical size injectors are necessary when I eventually go to forced induction; I've seen some guys on the internet go up to 60 pounds but my engine has stock internals....just trying to be prepared before I make the jump because I want to get it right the first time.

 

[Steel1]

Depends how much boost you want to throw at it.
If your fuel pump is stock that will need an upgrade as well.

 

[GreyMare88]

I'm only going 6-8 psi; will a 110 or 255 pump be enough?

 

[Steel1]

I would say 190 minimum but if you're changing it why not go 255.
I have a 255 on mine and have run anywhere from 5-10 lbs with it,
still running it with my n/a 393.

Imo 30# injectors would work but again you may want to oversize for future boost increase.
60# would be overkill at that boost level.
Don't forget you'll need a matching maf or some way to program it in the tune.
Are you planning on some type of tune/chip for the set-up ?

 

[GreyMare88]

I'm running a MSPNP unit; I got a 88 non-mass air car.

 

[Steel1]

Ok, so no need to worry about maf since the mspnp is speed density.
You'll just need to make adjustments in your tune for the larger injectors and boost.
@a91what on this site can give you all the help you need with the tune.

 

[GreyMare88]

I've been following him ever since I joined this site; when I do my H/C/I I'll add the unit on and get the ball rolling with everything.

 

[a91what]

If you plan for boost run a 255 pump and anything from 42-60lb injectors.

 

[GreyMare88]

Cool

 

[GreyMare88]

So let me ask this question; I'm going to a Gt40 setup before I eventually go to forced induction...will my 19's support my H/C/I with the MSPNP...just want to cover my bases before I buy unnecessary injectors and still have to upgrade again for later?

 

[Steel1]

You could run your 19s with a GT40 HCI n/a set-up using the MSPNP and upgrade injectors later.

If you have the extra funds you could upgrade your injectors while you have the top end torn apart for the HCI upgrade.
Then just tune the Megaquirt accordingly.

 

[GreyMare88]

Okay; I'll run the 19's and set myself up to get the injectors when I get ready for boost.

 

[96pushrod]

Okay; I'll run the 19's and set myself up to get the injectors when I get ready for boost.

When you boost, just buy some deka 80s and be done with it. They won’t be too big, or idle poorly.

 

[GreyMare88]

I haven't heard about the Deka 80's; how are they and who makes them?

 

[96pushrod]

Seimens /deka makes them. They’re the only injector I’d recommend buying, if you’re buying new.

 

[jchav02]

I have run 80 pound injectors with a mild NA H/C/I set up and tuning device (quarterhorse). The setup was gt40 heads, ported cobra intake, tfs 1 cam. It ran like stock. I now have an s trim with bigger heads and cam running 15 psi of boost. Since you have a MSPNP no reason not to get 80 pound injectors.

 

[GreyMare88]

If you plan for boost run a 255 pump and anything from 42-60lb injectors.

I'm looking at LMR.COM and they have the 47#; those should run either a Vortech or Kenne Bell at base psi....what are your recommendations?

 

[GreyMare88]

For what I'm reading on the Deka injectors they seem like a good investment; I appreciate everyone's input on this; keep feeding me input because I want a strong but reliable daily driver...I've had this car for almost 20 years and it's time to finish this car.

 

[a91what]

The lu47 may require use of injector clips for ev1 to ev6
Deka 60 will do the job but the 80 work just as well and you wont run out of room.
The 60s will move more fuel than the block can take.

 

[GreyMare88]

I appreciate the support; when I get everything I'll try to get it fired up and let you know how everything runs because I've seen your tuning skills on here.