I am looking for the right size injectors to use for my FC rebuild. I just got the motor rebuilt and its my first time so I need some help with the build. Since i'm doing most of the work. Any help is appreciated. Thx

 

So what is it, street port or stock?

If you are running stock boost levels, the stock injectors are fine.

If you have bumped the boost, you are good to about 8 PSI just on a fuel pump upgrade.

If you intend to go a bit higher, then 720CC secondaries and a way to control them is necessary.

Keep in mind that the stock ECU cuts fuel at 8.6 PSI so you will need a FCD to eliminate this.

 

its stock turbo, with a street port. I have an FCD, but i'm planning to upgrade the turbo for a bigger turbo. It has an HKS fcon and some old school electronics. So thanks for your input.

 

You are probably fine with stock primaries and 720CC secondaries.

When you upgrade the turbo, you will need to go with a standalone.

 

ok thanks for the help.

 

You could also use 84-85 GSLSE injectors on 87 S4 but up to a certain vin number
vin#. ending in 550168 (june 87).

 

How do I installed an aftermarket boost gauge. It has a vrey small plstic hose. do ia have to drill to create a port in to the intake?

 

Tee it into the boost/pressure sensor line that leads to the passenger shock tower.