I know this topic might of been posted before, probably every topic imaginable was posted here so I'll just ask anyway's and you guys can guide me or help me out in any way.

I am planning on putting a SR with 219 cam and "maybe" some after market heads or just having my stock ones ported.
The next step after this would be Installing some bigger Injectors and new custom burnt ECU chip.

I pretty much understand what I have to do for my ECU just get someone or a after market company burn me another one, but what about my Injectors?

I don't know any of the good brand names and I honestly don't know the difference between the stock ones and the after market ones or bigger ones.... that's all I know "they are bigger"

Is it difficult to install?
about how much should I pay?
what name brand is best?
what does 24lb/hr or 30lb/hr mean?

Any tips, help or web pages to help me out would be appreciated.

Thanks!
:cheers:

 

Are you sure you need "bigger" injectors? Maybe you should consider compensating for the increased airflow by using an adjustable fuel pressure regulator.

But let's answer you questions first:

1. No, injectors are actually very easy to install. Once you releave the fuel pressure, disconnect the fuel lines, and remove the plenum/throttle body, and intake runners, the fuel rails/injectors are right there.

2. The price you pay will depend on which injectors you settle on. Stock GM injectors will cost you $200CDN each, while Ford SVO injectors will run you about $450 for a set.

3. The ones everyone here seem to like best are the Ford SVO injectors. They are a very good design and resist clogging. They are a bit noisier than the stock GM Multech units though.

4. The 24lbs/hr and 30lbs/hr are the flow rate for a particular injector. The higher the flow rate, the "bigger" the injector. But while these numbers are important, its also just as important to look at what PRESSURE the flow rate is measured at. For example, our stock GM Multech injectors are rate at 24lb/hr, but this rating is at a higher fuel pressure than the equivalent Ford SVO injectors rated at 24lb/hr. This means that if you where to install Ford SVO 24llb/hr injectors on your GM car, they would actually flow MORE than they are rated for. So in order to keep from running rich, you would have to install an adjustable fuel pressure regulator to bring the fuel pressure down.

In your case, I would suggest the Ford SVO 24lb/hr injectors, along with a Holley adjustable fuel pressure regulator. That way, once you install the injectors and set your fuel pressure (I'm assuming you already have a fuel pressure gauge) you can start tunning and talking to people about burning a custom e-prom chip.

Good luck.

 

I didn't buy an adjustable fuel pressure gauge.. but I've heard that all our cars already have one? Is this true? isn't there a unit inside the plenum somewhere controlling the fuel pressure? is it just the actual pressure gauge that we need?

Your basically telling me that the computer can't create more fuel pressure and I have to adjust it manually with stock injectors, BUT if I get bigger injector my computer can adjust the amount of fuel being injected. If I don't want to spend extra cash on bigger injector I can keep smaller ones and adjust the pressure?

How will I know how much pressure to adjust to make my car run good? is this from trial an error?

So many questions...

I guess I'll deal with this issue when I'll be done modifying my car :smash:

Thanks for the help

 

This is Canadian $ and also for a set of 8 injectors right?

 

Your stock injectors are 22lb/hr.
Standard for a 383 is 30lb/hr. Although you may not need 30's with the TPI intake, you should need bigger than 22 already.

You should find something around 30lb/hr for a good price. Then install an adjustable pressure regulator at the same time.

Then have a chip reprogrammed when the SR and 219 is in, and it will probably take care of most tuning itself. From that point on you would just need to adjust the pressure so that it maintains the right A/F ratio. (you need a scanner to see the A/F ratio readings from the O2 sensor)

Get ski_dwn_it to burn you a chip, or Ed Wright at Fastchip.com.

 

Cool!

I understand what needs to be done!

Thanks Vader