New injectors

Redog · 07-13-2009, 10:32 AM

Well I'm looking at new injectors for my car.

Now I've been reading that stock is 22 but I also heard that stock is 20? Which is it?

Also I don't think I want to go as high as 28. if the stock is 22, do they make a 24 or 25?

lvemy3100 · 07-13-2009, 12:18 PM

19lb (1999) and 22.5lb (2000+) are stock

you may be able to find some in between 22.5 and 28 but most importantly how do you know you need the larger injectors to start off? Got some IPW scans I can peek at? If so I can let you know if the 28s will be overkill or not

jackal2000 · 07-13-2009, 12:31 PM

larger injectors and no way to tune is a bad idea.

Redog · 07-13-2009, 12:45 PM

I was talking to my racing buddy, the guy with the 69 Dart GT, he knows his stuff.

ANyway he suggested going from 22 to say 24. It will help the performance a lot, but will not need to be tuned due to such a small increase. I told him about the 28 injectors and he said that WILL require a tune

lvemy3100 · 07-13-2009, 12:58 PM

Quote:

Originally Posted by Redog

I was talking to my racing buddy, the guy with the 69 Dart GT, he knows his stuff.

ANyway he suggested going from 22 to say 24. It will help the performance a lot, but will not need to be tuned due to such a small increase. I told him about the 28 injectors and he said that WILL require a tune

unfortunately your racing buddy doesnt really know as much as you think... jackal was correct about changing the injectors without tuning.

if you want you can PM me in regards to this as I am sure I can help you with both getting the injectors and a PCM setup for the injectors at a decent price

[ion] C2 · 07-13-2009, 01:00 PM

Yep, 1969 vehicles are just like fuel injected ones with computers.

Bigger injectors aren't going to "help the performance a lot" unless you need them and are experiencing higher IDCs than you should be, causing the injectors to heat up and become damaged and/or fuel cutting out. They aren't a power adder, you get bigger ones if your injector duty cycles are above 80% quite a bit at wide open throttle.

Injectors aren't meant to change the way the vehicle runs at all. You need to adjust the injector constant (decimal number which tells the PCM how large the injectors are so it knows how long to hold them open for and adjust the air-fuel ratio in closed loop properly). If you put in any size larger injectors without changing that number, your closed loop performance will be off, and it will cause the car to run badly at idle and low throttle conditions. Open loop (heavy throttle) will be too rich without the injector constant changed as well.

I am extremely surprised that, especially for an N/A application, where you want to extract the maximum amount of power from the engine, that you do not have any tuning software. The tune is vital, it's everything.

NickAlero2000 · 07-13-2009, 09:16 PM

Quote:

Originally Posted by Redog

I was talking to my racing buddy, the guy with the 69 Dart GT, he knows his stuff.

ANyway he suggested going from 22 to say 24. It will help the performance a lot, but will not need to be tuned due to such a small increase. I told him about the 28 injectors and he said that WILL require a tune

Might as well get the 36lb's off a Cobalt ss. You NEED to tune, no matter what.

AleroB888 · 07-13-2009, 11:11 PM

Quote:

Originally Posted by NickAlero2000

Might as well get the 36lb's off a Cobalt ss. .................

Those won't work.