Can I use 24lb injectors on a speed density?

[ramjetlx]

Will it work with the stock speed density computer? My injectors are going but I dont want to replace it with the 19's since I will be supercharging it soon. Do I have any other options?

 

[sn9550]

I run 24# injectors with mine. I haven't had any problems.

 

[ramjetlx]

Thank you for your input. Which ones did you use to make it compatible? Are the ones by Ford Racing okay?

 

[Daggar]

It doesn't really matter so long as they're the same and the right style. The Ford pieces will be just fine. A word of caution though:

The 24s don't always perform well with SD. I run them as do many many others. Seem like one out of 5 stock SD computers has a problem with swapping only the injectors. Your Sig doesn't mention any mods that suggest you need 24s. If you're installing them in preparation for the KB install then you're on the right track. Keep in mind however, that the FMU that came with the kit is going to cuuse you to run rich in combination with those injectors and just about any high volume fuel pump. More than likely you'll end up having to swap the FMU disk to change the ratio to get it back in line --or-- you can run the stock fuel pump and the Kenne Bell Boost-a-pump. If you've not already purchased a wide band 02 for this whole deal then I will expect to see you post threads about blowns gaskets and/or motor in the very near future. The only alternative is a custom tune and even THAT, I don't consider to be a replacement for a wide band.

Good Luck!

 

[ramjetlx]

It doesn't really matter so long as they're the same and the right style. The Ford pieces will be just fine. A word of caution though:

The 24s don't always perform well with SD. I run them as do many many others. Seem like one out of 5 stock SD computers has a problem with swapping only the injectors. Your Sig doesn't mention any mods that suggest you need 24s. If you're installing them in preparation for the KB install then you're on the right track. Keep in mind however, that the FMU that came with the kit is going to cuuse you to run rich in combination with those injectors and just about any high volume fuel pump. More than likely you'll end up having to swap the FMU disk to change the ratio to get it back in line --or-- you can run the stock fuel pump and the Kenne Bell Boost-a-pump. If you've not already purchased a wide band 02 for this whole deal then I will expect to see you post threads about blowns gaskets and/or motor in the very near future. The only alternative is a custom tune and even THAT, I don't consider to be a replacement for a wide band.

Good Luck!

I appreciate the great advice!! Something I didnt know about!!! Maybe I should hold off on the KB since I dont want to go through the hassle again to check all of my gaskets. Guess I need to do a little more research or switch to mass air....

 

[Deleted member 87397]

I'd convert to mass air before you boost it.

 

[Daggar]

I'd convert to mass air before you boost it.

That would depend on the application. If you're running 8 lbs or less from the 2.2L then you're fine, 9 lbs or less from the 1.5L.

SD motors run very well on boost if tuned correctly. The difference is that SD applications must be tuned mechanically instead of electronically.