Injector sizes
warriorcustoms, you are taking a very narrow minded and "keyboard warrior" approach to this. If you READ the other thread you would see multiple very smart people with cars that do far better than the should report better performance with small injectors and ONE person is reporting the opposite. I believe both sets of people and my open mind would like to figure out whey we have knowledgeable people finding opposite results.
I am also no kid, just capable of seeing what happens in the real world as opposed to just using internet calculators.
I am also no kid, just capable of seeing what happens in the real world as opposed to just using internet calculators.
lmao I was just quoting you caprice Not directing & small injectors would prolly run lean & mean but hand grenade before another Hell the last injector thread I told the OP what the calculator spit out & these same people said oh thats too small LoL Yes everything has variables & you can run more psi to get more flow out of said injector BUT the biggest part of it is in the tune & WHO tunes it If my car wont run 10s on the motor & 9s on the spray I guess I will get a new program calculator LoL & Bob I didnt even see you posted lmao & I guess I better stop bein a keyboard warrior Before my alligator mouth overloads my hummin bird *** LMAO Im done yall Getter Done
Last edited by warriorcustoms; May 21, 2012 at 11:54 PM.
I'm running 42 on my 396, since I got them for a steal. On the engine dyno it made 580ish, but in the car the bottom end sucks. Could be the cam, but my wideband is telling me it run pig rich up top.
On a serious note it's too bad I didn't know then what I know now. I might have sent out my stock 24# out for a cleaning instead of spending the $$$ for 8 shiney new 42#'ers which were recommended. Oh well.
OP, I won't debate whether you should stick with the 24's, but for anything up to 450 rwhp, DEFINTELY go no more than 30's if you decide to change them. I'm running 30's with my 425 rwhp, so I'm comfortably in the middle ground.
For those that have never seen it. This is my stock internals LT1 car. It ran a best of 7.05 in the 1/8th. We did that with Ford 19 lb injectors! Why? Because we had the stockers turned down so much to make it run. The switch gained .04 in sixty foot!
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Sorry if I messed up your thread.
My thoughts on this are that any modified LT1 could do with a good fuel pump and adjustable regulator. It is my opinion that the formula floating around for injectors was published by people who sell injectors. How much time do you actually run WOT? In all but maybe a road race situation I doubt that you will kill a good injector by pushing it closer to max than what the experts recommend.
My experience is that the smallest injector that you can get away with will perform better on the bottom end. Bigger injectors once tuned will perform pretty much the same on the top end (within reason). Another thing to note is that I have had better performance with smaller injectors at higher pressure than with bigger injectors at stock pressure.
From my own experience I have made around 400 RWHP on stock injectors at 45 psi. I have made 588 RWHP on 42's at 50 PSI (LSX).
If it were me, I would play with the stock injectors first.
My thoughts on this are that any modified LT1 could do with a good fuel pump and adjustable regulator. It is my opinion that the formula floating around for injectors was published by people who sell injectors. How much time do you actually run WOT? In all but maybe a road race situation I doubt that you will kill a good injector by pushing it closer to max than what the experts recommend.
My experience is that the smallest injector that you can get away with will perform better on the bottom end. Bigger injectors once tuned will perform pretty much the same on the top end (within reason). Another thing to note is that I have had better performance with smaller injectors at higher pressure than with bigger injectors at stock pressure.
From my own experience I have made around 400 RWHP on stock injectors at 45 psi. I have made 588 RWHP on 42's at 50 PSI (LSX).
If it were me, I would play with the stock injectors first.
My last datalog with the Ford 24's at stock pressure:
TPS 100%
INJ Duty Cycle 96%
BPW mS 20.68
O2 mV 950 - 960
Any help? I guess not until wideband O2 tuning starts. Damnit
If I was made of money I'd just buy a set of 30's AND 36's and try them all. LOL.
Tuner says don't sweat it I can get 30s or 36s it wont make a difference to him. Does that make sense?
TPS 100%
INJ Duty Cycle 96%
BPW mS 20.68
O2 mV 950 - 960
Any help? I guess not until wideband O2 tuning starts. Damnit
If I was made of money I'd just buy a set of 30's AND 36's and try them all. LOL.
Tuner says don't sweat it I can get 30s or 36s it wont make a difference to him. Does that make sense?
Did you read the thread??? Obviously not.
My opinion is that if it is running up top without being destructively lean or coughing then the 24s have to at least be in the ballpark. If you want spares just incase the 24s are somewhat lean up top I would just get the 30s they represent a 25% increase. If you leave them in the package you could probably even return them if you don't endup needing them.
There is debate over whether the SVOs are larger than Delphis of the same rating because Ford uses 39psi and GM 43.5psi as standard pressure so maybe you 24s are a little bigger than that anyway.
I have 36s on mine and wonder if I could sneak a 1.4 with a smaller injector based on GIZMO and Pat's experiences.
On The Tree
Joined: May 2012
Posts: 101
Likes: 0
From: Keller, TX
At 11.56 and hauling boats and such around... I wouldn't worry too much about it.
Anyone ever wonder if the smaller injectors at >90% duty cycle are simply exhibiting better spray patterns? Seems to be a lot of speculation 'why' with no real quantifiable tests. Large injectors can work just fine too, if you buy the 'right' injectors.
Anyone ever wonder if the smaller injectors at >90% duty cycle are simply exhibiting better spray patterns? Seems to be a lot of speculation 'why' with no real quantifiable tests. Large injectors can work just fine too, if you buy the 'right' injectors.
On The Tree
Joined: Apr 2010
Posts: 162
Likes: 0
My last datalog with the Ford 24's at stock pressure:
TPS 100%
INJ Duty Cycle 96%
BPW mS 20.68
O2 mV 950 - 960
Any help? I guess not until wideband O2 tuning starts. Damnit
If I was made of money I'd just buy a set of 30's AND 36's and try them all. LOL.
Tuner says don't sweat it I can get 30s or 36s it wont make a difference to him. Does that make sense?
TPS 100%
INJ Duty Cycle 96%
BPW mS 20.68
O2 mV 950 - 960
Any help? I guess not until wideband O2 tuning starts. Damnit
If I was made of money I'd just buy a set of 30's AND 36's and try them all. LOL.
Tuner says don't sweat it I can get 30s or 36s it wont make a difference to him. Does that make sense?
This is a rough example. Drop you BPW from 20.68 to 15.51 (a 25% decrease) which should put your duty cycle to approximately 73%. And simultaneously raise your fuel pressure approximately 22%. I bet that puts you almost exactly at the same A/F ratio you currently reside.
Then I would fine tune it from there with a combination of BPW changes and fuel pressure changes.
...There is debate over whether the SVOs are larger than Delphis of the same rating because Ford uses 39psi and GM 43.5psi as standard pressure so maybe you 24s are a little bigger than that anyway.
I have 36s on mine and wonder if I could sneak a 1.4 with a smaller injector based on GIZMO and Pat's experiences.
I have 36s on mine and wonder if I could sneak a 1.4 with a smaller injector based on GIZMO and Pat's experiences.
Unless you have a set of free or cheap 30's to try, I really don't think it's worth it for you. I'll go out on a limb and guess you're closer to me than to Gizmo when it comes to spending enough track time to really chase down those potential hundredths in 60'. I think there are better sure-fire options to get yours down in the 1.4's -skinnies! weight reduction!
