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I have stock injectors and I have them ready to ship to a company that can make them up to 48lb by changing the discharge plate.
Some say with the right tuner, you can use just about any size and they will make them work? Is this true? Should I just make them 48lb?
I have full bolt-ons and a cam. So 36lb or so should be enough, but I might use nitrous in the future...should I just make them 48lb and let the tuner do his job?
03 cobras have 39's, mine made 500rwhp and still had some inj duty left.
The main thing I need to know is if the right tuner can make em work...Then I'll just get 48lb so i can be ready for the future.
Anyone know?
I have hp tuners and it will change em if ya know how. its just simple math and then using a multiplier in the injector table.
OK thanks, I'm sure my tuner knows what he's doin then.Quote:
Originally Posted by JRENIGAR
Thanks for your help.
I havent checked what the max injecto size it will adjust for is but surely it will go that high or higher.
If you're having a reputable service like FIC resize your oem injectors, and check for flow balance it is a simple matter to change the injector flow rate and the other parameters such as voltage offset remain stock.
One thing to remember is that Ford injectors are rated at 42 PSI (3 bar) and GM are rated at 58 PSI (4 Bar), so you have to make sure you compare sizes at the same PSI.
I think I had my oem gm injectors resized to 38 lb/hr at 3 bar and I have right at 500 hp at the wheels.
If you plan on a dry shot, I'd go with the 48's !!!
Yep, I'm having FIC do em.Quote:
Originally Posted by KP1
I did go with 48 :DQuote:
Originally Posted by bills98ta
Quote:
Originally Posted by KP1
It is actually 3 bar and 4 bar...... I have 42lb Bosch design III's that flow 48lb's at 4 bar FWIW......
I mean is it sad to say that I have a head and cam ls402 and still using the stock 98' injectors :)
Thanks for clarifying that. I thought it was 3 and 4 also.Quote:
Originally Posted by SOMbitch
yesQuote:
Originally Posted by dude2000_22222
I mean what would be the reason to upgrade I don't think you would see any performance increase?
Quote:
Originally Posted by dude2000_22222
I would love to see your injector duty cycle from ~4500ish RPM and up. Do you know what it is?Quote:
Originally Posted by dude2000_22222
Quote:
Originally Posted by dude2000_22222
The cam is bringing in more air so i need injectors that can keep up. That's all.
You're right. Corrected.Quote:
Originally Posted by SOMbitch
To be honest I didn't even think to ask the tuner about it. But to come to think of it the car's hp curve dies around 5200 rpms and he could not figure out why. He just assumed I needed better heads but could it be the injectors?
What year is your LS1? What are your mods?Quote:
Originally Posted by dude2000_22222
Its a slp 402 with a 236/236 cam, headers, 98' heads heavily worked, bigger valves, ls6 intake. The car makes around 445rwhp and 460trq. But the power curve dies at 5200 or 5400. He believes its the heads but unless my flow charts are lying I think they flow fairly well. He says it should be around 500 at the wheels easy.
well i think the fact that your injectors are maxed fairly early in the rpm range would have to do with that :chuckles:Quote:
Originally Posted by dude2000_22222
So obviously I have to get bigger injectors if you get them resized is it still efficient? I been reading that resized injectors never flow as well as ones already made for that size. And I guess 48# would be good enough?
The issues arrise when aftermarket injectors are used for which most of us do not have some of the correct parameters and you get problems with rich decel and some small pulse issues and no known voltage offset values.
Resized oem injectors have worked well for me. Nothing needed but changing the Injector Flow Rate, and that's easy enough.
Sounds like a pretty stout engine. I'd say you need at least 36lb minimum. I went with 48 so I have room to grow.
500rwhp cars typically have 42s I have noticed...do some searching if you aren't sure.
But just so I understand the stock injectors are definitely limiting the car the way it sits with the work it already has done?
yesQuote:
Originally Posted by dude2000_22222
Yep... 36 - 48 lb'ers and a good tuner !
My 48 lb'ers average around 85% duty with a 150 dry shot at 7000 rpm...
id question the tuner as any competent tuner would have noticed the engine was under injectedQuote:
Originally Posted by bills98ta
:cheers:Quote:
Originally Posted by shady milkman
Yea, I'd DEFINITELY get some bigger injectors on there man.
where is a good place to get good injectors for a good price, im looking at 36 or 42lb, i have ls1 with ls6 heads, cam 23x 24x dur, 60x, 61x lift, and going to be putting on fast 90 and nick williams 92 throttle boddy?
I dunno where the best is, but FIC Injectors is doing mine. I should receive them anyday now.
where do i find them or contact them lol?
Well if you are making 450rwhp I would say yes even though you have the better 28.5lb 98'sQuote:
Originally Posted by dude2000_22222
I agree with this. I f you were running out injector your tuner should have told you this.Quote:
Originally Posted by shady milkman
Google Fuel Injector Connection. They have a house brand called Blue Demon that go for about $250 a set IIRC.Quote:
Originally Posted by devildogws6
I picked my flow matched Bosch's up out of the classifieds at tech for $225 shipped. They were brand new never used so I saved about $100. I have seen used 30lb SVO Redtops that flow 36lb at our fuel pressure go for $125 all day long over there......