This is for my 94 lt1 with hot cam, stage 3 heads, 52mmtb and slpK&N.
Which type of fuel injector do you guys recommend?

 

I've never used Accel, so I can't say. But the Bosch injectors I got from Bruce at Five-O Motorsports pulse like new money!

 

If there isn't anything wrong with your stock injectors, I would just have them serviced (cleand and flow tested) and go with them. They are of adequate size for your engine as it is. If you really need to replace them, then Bosch, Ford Motorsports, or Accel is OK. Accel injectors are made by Bosch so there is no need to worry about quality. Don't go nuts by oversizing the injectors when you go to buy them, 24lb/hr injectors are more than adequate for what you are doing.

If you want to have them cleaned, there guys here can recommend you to a reputable facility to clean them for you. One I know if is Russ at RC Engineering. His website is: www.rceng.com

 

holley also makes a great injector.


go to one of those calculators and see what you need to do to get 80% duty cycle. bigger injectors aren't good unless its to lower the duty cycle. they will just be less effective/efficient.

 

Holley, NOS injectors are made by Delphi, same as the GM Multecs Thats why they are good injectors

 

But a 92 would have 22lb injectors right so it probably would be good to get the 24lb aftermarket ones there right?

 

Urban legend, the 92 has 24lb injectors.

You'll be just fine running the Hot Cam with stock injectors.

 

Excellent. You knew what I was thinkin.

 

I have the FMS Blue Tops... they work great.

 

I have an opportunity to buy 28# injectors at a good price. Do you think this would be overkill?
What would I have to do to make the 28# work in my 1994?

 

serious overkill. you would need a blower to make those worth having.

 

Over kill is okay for the right price! , but would the car run well. Also what would I have to do to make them work?
Programming? Adjusting Regulator?

 

Let me guess they are LS1 takeoff injectors for $99. Yes they will work fine.

 

ummm no. a blown 350 should be using much bigger injectors that that...
depends on fuel pressure... but a blown 350 =500rwhp? on 28# injectors?


idont think the 28# for a good price are a bad idea, but thats me

 

It depends on what they come off of. You see the problem with using different injectors than what specifically came on the car is that you have to guess at their rating. LS1's use a radically different fuel pressure than the LT1 does. If they're LS1 injectors who knows what they really act like on LT1 pressure, so you're only guessing when you program the computer. You can buy an adjustable fuel pressure regulator and run them at rated pressure, but then you're into buying another part that you don't really need to make a part that you didn't really need in the first place work.

LT4 injectors were bigger and would be rated at the same fuel pressure as the LT1. If they are LT4 injectors for a good price, go for it. If they're LS1 injectors, pass. They have to be modified slightly to even make them fit so it really turns into a hassle.

As far as making it work, you need to program the injector constant in the computer to reflect the change. That in and of itself isn't hard, you just have to know what to program the value to. This can be strictly a guess unless you're running them at rated pressure.

 

28's would work fine in your car, in a 96 LT4 the rated flow was just under 27lb/hr. It all depends on what injectors are that these 28's are. If they are indeed the LS1 pulls, they will work OK. As Nathon pointed out the LS1 has a totally different fuel rail pressure than our LTx engines. They are rated at 55 PSI while our rails are rated at 43.5 PSI. There is a conversion factor that you can use to recalculate their actual flow and it does work. The equation is:

( (sqrt) new pressure/old pressure ) x old flow rate = new flow rate

For instance the LS1 injectors at 55 PSI with an old flow rate of 28 lbs

((sqrt) 43.5/55) x 28 = .8893 x 28 = 24.9 lbs/hr

Another example for a Ford Motorsport injector rated 24lbs/hr at 39 PSI with a pressure change to 43.5 PSI

((sqrt) 43.5/39) = 1.056 x 24 = 25.35 lbs/hr

I have heard some people saying that the LS1 injectors work fine and others say they have had problems. Mainly because they are demensionally shorter than the original multec injectors that your car came with. The Ford motorsports, Accel, Delphi Lucas and the standard bosch designed injectors all fit fine without any problems.

The LS1 injectors are also known as a bosch2 injector with an all pastic body. They were also used in ford applications as well. Most of the LS1 boys use FMS or other Bosch replacements with they upsize for performance uses.

 

Thanks guys for all the insight. It makes it so much easier to buy or do something when you have all this experience just a click away.

The owner of the injectors said "They are a direct replacment, An after market Fuel prsure regulator will help when you dyno tune the car but is not needed."

tjwong, you will probably doing my programming so I will find out more info for you when I ready to send you the unit.

 

These are the injectors. Nathan said I may have problems installing them. Is not just screw in an plug in?
Here is a link to a the specs on the injetors from Racetronics vesion. http://www.racetronix.com/12561462RFM.html

 

The injectors don't screw in, they just clip into the fuel rail and sit down into the intake manifold. The stock length injectors will do this no problem and you don't even really need the clips. The LS1 injectors though are shorter and you must use the clips to hold them into the fuel rail. Unfortunately they don't have the proper provision for the clips so you have to modify them slightly to make them fit.

If you don't the second you pressurize that fuel rail the injectors will slam down into the intake and seperate from the rail, spewing fuel everywhere. They're fine injectors but they really aren't meant for the LT1 car. They CAN work but just be aware that there are issues to overcome when using them.

 

Nathan as always thanks for your help. I am glad you are always willing to help others.