Forced Induction Injector size for supercharger

GreyMare88 · Feb 22, 2020

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 · Feb 22, 2020

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

GreyMare88 · Feb 22, 2020

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

Steel1 · Feb 22, 2020

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 · Feb 22, 2020

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

Steel1 · Feb 22, 2020

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 · Feb 22, 2020

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 · Feb 22, 2020

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

GreyMare88 · Feb 22, 2020

GreyMare88 · Feb 22, 2020

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 · Feb 22, 2020

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 · Feb 22, 2020

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

96pushrod · Feb 23, 2020

GreyMare88 said:
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 · Feb 23, 2020

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

96pushrod · Feb 23, 2020

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

jchav02 · Feb 23, 2020

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 · Feb 23, 2020

a91what said:
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 · Feb 23, 2020

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 · Feb 23, 2020

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 · Feb 23, 2020

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.

Forced Induction Injector size for supercharger

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