What size injectors would be in an LS1 Camaro from 1999? 26? I thought they went to 28's on 2002 or something.

Thanks,
Rob

 

IIRC
98 had 28s
99-00 had 26.something
01-02 went back to 28s

 

Al is correct besides the fact that LS1s didn't stop at 02.

 

If you want specific:

98: 28.6 lb
99-00: 26.4
01 and up: 28.8

 

Cool. I bought some injectors from a 99 to replace my 1993's 22lb injectors. I think at the Lt1's 43.5 psi the 26 lb injectors should work do the job.

 

The 26.4lb LS1 injectors should flow like a 22.8lb injector would at 43.5psi according to my spreadsheet.

 

Exactly.

I hope you aren't using this in an LT1 build. The 26# aren't going to flow 26# with LT1 fuel pressure.

 

I am using them on an LT1. I have a '93 which has 22lb injectors. I am using them because they handle higher fuel pressures, unlike the stockers that I am using.
I am using a dry nitrous kit and I don't want my stock injectors to lock up at 80 psi.
If they flow close to 22lb/hr at 43.5 psi I should be good to go.

 

So, which way are you going about this?

If you're using a dry system, you definetly need bigger lb/hr than stock injectors, since your injectors will be the only thing adding fuel.

So, what you're saying is that you're running the fuel pressure high to make the injectors act larger and hoping they don't lock up?

Why not just buy some cheap 30# SVO injectors and run the stock fuel pressure?

 

The dry kit deadheads the fuel pressure regulator to bump the fuel pressure during nitrous use to about 70-80 psi with a 75 shot. Some dry kits just spray nitrous through the MAF and trick the ecm in to spraying more fuel at the stock pressure.
Going with 30# injectors and a retune will not benefit this kind of kit, unless the injectors go static or something.
I have run this type of kit on a few 5.0L Mustangs and it works great. You can't really spray more than 150 this way though. I keep it at 75-100 to be safe.

 

That's a pretty poor way (from a tuning standpoint) of making a dry kit work. A 93 LT1 has speed density, so it's a shame that you can't spray through the MAF and let the computer add fuel with bigger injectors. That would be the easiest and most efficient way of tuning it.

 

You can change the bypass jet that goes to the regulator to fine tune the amount of extra fuel pressure you get. If you can keep you bottle pressure consistent with a heater and tune it with a wideband, you can get it dialed in nicely.

 

My original injector question was because I read that stock LT1 injectors (ball and disc type) tend to lock up at high pressures. So I needed a pintle type like the LS1 and Ford injectors. Considering my '93 has bastard 22# injectors, I am limited as far as a bolt in replacement goes without have my chip re-burned. Later if I go with more engine work, I will upgrade the fuel system as well.

 

A 26.4lb LS1 injector will flow like a 26.4 LT1 injector will flow like a 26.4 Ford injector.

Injector flow ratings are done at a set pressure that has nothing to do with any car or motor. An injector rated at 26.4lbs/hr is designed and tested to flow that much fuel at 3 bar (42psi). An injector rated to flow 22lbs/hr is designed and tested to flow that much fuel at 3 bar. A 96lbs.hr injector flows 96 lbs per hour at 3 bar.

A 26 lb injector from an LS1 installed in an LT1 in place of a 22 lb injector will flow 4 lbs/hr more.
The bit about an injector acting bigger from one app to another is an old wive's tale. You can make any injector flow more or less than ''it's rating'' by increasing/deacreasing the pressure from the 3 bar.

 

I have read this as well. I have also read that LS1 injectors are rated at 58 psi (4 bar). I guess when they arrive I will try them out. If they don't work I will send my chip back to Ion for a retune.