Injector size?????
 

If I put 32# injectors on an LT1 with just a full exhaust, it should be ok right?
I know that will require a PCM tune at a minimum, but I am about to get that done anyway, but that should be all it needs to work fine?

Re: Injector size?????
 

question: what are you doing that you need 32s? preparing for a cam/heads project?
and i'm not exactly sure of the answer but, i would suggest searching for a quick answer
i thought i remembered seeing a thread about this a while back

ttt for ya tho:)

Re: Injector size?????
 

If you are planning on changing other stuff down the road make sure you put large enough injectors in now to feed it down the road no point in paying out the $$$ twice A good tune will make any injectors work on your set up as long as you dont go way out of reason

Re: Injector size?????
 

Thanks guys. The reason i was considering those was because..
1. I am planning a heads/cam package later on (but you know how those go)
2. Somebody was selling them for a good deal ($125)
3. About to send my computer to get tuned anyway

I decided to just order the 25# injectors from SLP since the guy selling the 32# didnt know what they were. Its not a good deal if I have to pay more money for alot of guess work later on. Besides, for only $100, I can replace them again later if needed.

Re: Injector size?????
 

Why are you going with 25#? 24# is stock. Are the originals broken? A rule of thumb is that 24# will support up to 310 Crank HP. You can do the math for your target HP based on that ratio. For example, if your target Crank Hp is 500, you would want at least 39# injectors.

Re: Injector size?????
 

Did I fail to mention I have an LT1? No wait, I did post this in LT1 Tech right? ;) Stock as far as I know is 19#.

Re: Injector size?????
 

wait 36 lbs is good for 600 crank hp then how are 39 lb good for 500 that dont make sence

Re: Injector size?????
 

seeing that your name is ws6XXXXXX and they didnt make the ws6 until after 93 that i know of. that means you have 24# injectors stock. and they will support 340rwhp. and you also need to know what kind the new injectors are and what they are flowed at. becuase if they are 25# at 50 psi they would acctually be smaller than your stock 24# so you need to know what your buying, and the pcm will not correct for different size injectors. and you could possiblly ruin your engine.

sounds like a waste of money for 25# injectors but its your money.

Re: Injector size?????
 

I've got 42's for 580HP.

Re: Injector size?????
 

Does anyone else see the decrepency??? So will 24# injectors support 310 FWHP or 340 RWHP. I need to know cause I will be starting up my new motor in about a month and for now have the stock injectors. The motor is a 355 with the hot cam, AI econo-ported heads, with stock TB, and Stock manifolds.

Thanks

Re: Injector size?????
 

Based on some "standard" formulas out there (80% duty cycle, etc) The stock 24# injector will support 310 crank HP. You can push them harder, but if you search for fuel injector formulas, the math says 310 HP. The stock motor is 275 HP. I went to 42# injectors because my target HP is 400 RWHP/ 500 crank HP. (approx). Again, if you are not pushing the engine too far, stay with the stock injectors.

Re: Injector size?????
 

see
http://www.rceng.com/technical.htm

Re: Injector size?????
 

stock injectors aregood for 340rwhp. madwolf ( does tuning for a living) and proved it on a dyno.

there is no discrepency if it will suport 340 rwhp it will also suport 310 fwhp.

if you want the dam injectors buy them, sounds like you have your mind made up anyway.

Re: Injector size?????
 

My target is about 375 FWHP I think that's about all I'll see with the stock manifolds. So if I run the 24 lb injectors to break the motor in... how is this gonna effect me? I just don't get a good grasp on what a reprogramed engine will do? Will the injectors be fine for lower RPM's and lean out at high RPM's or will it lean out through the entire range?

Re: Injector size?????
 

I'm running my stock injectors at 390 rwhp.......... think they might be maxed out. :D