99ss00ws6

I have had one of my injectors go bad, I was thinking of just replacing the whole set maybe upgrade. The car is a 99 so I believe it has the 24.5lb. Since my car has already been tuned should I just stay with a set of stock injectors or will it matter if I go ahead and get a bigger set? If so will I need to get it tuned again? Thanks

ozzykicks2002

Well if you car is NA there is no reason to upgrade the injectors stay with the stock ones.

SsZERO

Not true...even an NA car will need upgraded injectors with a decent size cam and heads. But if you mean a stock or mostly stock engine, then you stick with the stock injectors unless you are planning to do some heavy mods in the future. I would guess that swapping to larger injectors without a tune would have you running rich since the pulse duration needs to be adjusted. The larger injectors flow more fuel within the same pulse duration as the stock units.

99ss00ws6

Well I am not heavily modded (mods are in the sig) I do not have any more plans in the future. I just dont want to get bigger ones if I have to send my pcm off again and have it re-tuned. But if I am maxing my injectors out right now then I would rather get some bigger ones and do the tuning if it is needed. If so what size would be good to go with.

ozzykicks2002

If your not going to get big mods int he future IE turbo or supercharger then I would just stay with the stockers. you wont have to get a re-tune if you do that, and whn they did tune your car you should of be able to see the duty cycle of your injectors and see if there are even close to being maxed

99ss00ws6

I did a mail order tune through Chris R. I was planning on taking it to get it dynoed and tweaked if needed sometime in Sept. If the 28lb or the 30lb injectors will be ok to run for a little while until I can get it retuned then I could possibly do that. If it is worth the extra $$$. I have done some searching and some people have claimed that there stock injectors w/ similar mods to mine are maxing out there injectors. I just dont know enough about this to make the right decision. I have found a set of lt1 25lb injectors That should come out to about 28lbs on a ls1 right? These are pretty cheap, would this be a option to go?

bshell

iTrader: (24)

Do you have any way of logging what your current pulse widths are? 99 fbodies have the smaller injectors, so you will be closer to maxing them out than other fbodies would be. Check out this thread: https://ls1tech.com/forums/pcm-diagnostics-tuning/306296-conversion-injector-pulse-width-duty-cycle.html and see where your injectors fall on the chart in post #3. If they are in any of the yellow, you will need to upgrade. Keep in mind that if you get any injectors other than the 26.4# that came stock, you will need a tune.

txhorns281

iTrader: (12)

Eh, the stock 99-00 injectors SAFELY (80% DC) hold up to roughly 400 crank horses. I'd venture to say that you are above that mark and are close to, if not completely, maxing out a stock flow injector. In my setup I was pushing 100% from 4500 all the way to redline on the 26.4 #ers and that's cam only (~470 crank horses).

Pick up some SVO 30#ers, they flow as a 36#er on the LS1 rail, and will keep your DCs under control, and allow for a little extra room for growth. And yes, you can run on the stockers, but when we talk about running 100% on any injector, you're really taking a gamble on whether or not that injector wants to hold up against time. You did just lose one right? hmmmm

99ss00ws6

That is correct. My #7 injector has no ohm reading at all. Would I be ok for now with the svo 30#ers until I can get a tune? Like maybe a 200 miles or so. I have no way of logging my current pulse widths. Could I do that with autotap? I have been wanting to buy it this would be a good excuse for me too.

99ss00ws6

What would be a good choice between the SVO 30#ers and the racetronix 32#ers?