i have a 2.4liter ss motor....and i was wondering if the 2.0 stage 1 injectors will work on it, and if so how much horse power do you think will be gained?

 

why would you want to swap your injectors?

 

you wont need that much fuel. Try getting ahold of a set of stock 2.0 injectors 34#'s i believe, and then get it tuned. Seems guys are getting decent gains out of that.

 

yeah thats way to much fuel for our cars. the stock 34#s are plenty its not even close to maxing the fuel flow.

ryan.

 

well the name of the game is air and fuel. i have gmpp intake.......just had the idea of injectors.

 

the stock ss.sc injectors (34 pounders) will be good trust me, 34s and a good tune will give about 15hp. the injectors don't give hp, it's the tune that does

 

just because you throw injectors on doesnt mean you are gonna make more power because more fuel CAN be pushed. like everyone is saying, you will need a tune to be able to take advantage of this at all

 

yup thats right.

ryan.

 

This has to be the most misunderstood idea ever.

You can NOT simply put bigger injectors in a car and expect more power. Not even if they are tuned.

If you put bigger injectors in a car without tuning them, you are actually hurting your engine and losing power because the tune you have doesn't work with different injectors.

If you do tune it, you end up making the same amount of power as before because the tune just makes the new injectors work just like the old ones.

There is absolutely no reason to install bigger injectors in a normally aspirated engine. None. Period.

 

well i gained about 10 whp from it so whats the big deal. there fine till i get turbo then i might sway them for what the kit comes with i dont know.

ryan.

 

No you didn't.

 

For the 2.4L you are better off using the aftermarket 42# injectors if you need THAT much fuel. I believe that the 2.4L has Bosch style injectors to begin with. (Solstice does) so you wouldn't need a different injector harness.

the 32#-34# injectors from the stock SS/SC are MORE than adequate for a modified 2.4L. Look up the thread we posted on the swap to get the part numbers. The tunes are easy to do as well.

You are mistaken, and do not understand the tunes.

The cars are able to use higher RPM's, and take a marginal amount of timing more than they were previously capable of.

The additional horsepower gains and performance come mostly from the raised rev limiter, which is not attainable with the stock injectors.

If you were to put the injectors in and simply adjust the flow rate to make them run properly, and made no other changes, then you would see NO performance gain, other than a more reliable injector in high rpms. But with the tuning that is being used for those larger injectors, that requires their support there is something to gain.

 

By changing the rev limiter your just allowing the computer to let the car rev higher in the rpms. You can't make hp by raising the rev limiter unless your still gaining hp as its approaching the stock 6750 which if you look at any 2.4 dyno it isn't. And yes it is attainable using stock injectors, see vector tunes (which i know you love so much)

The only reason these tunes are needing the injectors are because of the tune its self. Go to any pro tuners ie vector or westers, and the extra injectors are not needed. Also are their any before and after dyno's with those who did the injector swap/tune? I'd like to see how they compare to the vector and westers dyno's.

 

well i used your tune physcostevo and we tweaked it somemore and it runs a 173whp with everything i have listed which isnt to bad. but its sufficient till turbo comes into play then everything will be redone anywhos. lookin upwards of 270whp i may do pistons or cams not sure yet. but thats a huge build for me like the next yrs pay check to save so when i have my surgery july i may start saving even though i wont be working but after that i may chip in a few pennies here and there lol.

ryan.

 

Did you get a before tune dyno? Otherwise that 173 doesn't mean much.


And btw take that 1/4 time out of your sig, calulatated conversions from 1/8th times don't count.

 

hey its pretty damn close. i havnt been able to run 1/4 norwalk is to far. anywhos i didnt get a baseline dyno i bought the parts earlier then expected and just threw em on. . it runs perfect now not rich but it does lean out at 120 it just hangs there not gaining ive had it up to 130 but after 120 very very slow. disapointed. anywhos talk to you when i get home from work.

ryan.

 

i totally agree. my point was taken the wrong way. i didnt mean with a tune and injectors he would see more power. i was simply saying that if he was running supporting mods that REQUIRED the larger injectors because the old ones were maxed out, he would see power because the entire system could run more efficiently.

 

Just what kind of mods would require bigger injectors? Just an air intake and headers? How about with performance exhaust?

 

The reason the cars don't make power at peak RPM's is because the motor pulls timing ~400rpms before redline. By raising the rev limiter, you raise its ability to make HP at higher RPM's. You can only safely raise the rev limiter if you swap injectors. Look at a 2.0L Stage 1 upgrade for a good example of this.

 

no you cant use the stage 1 injectors way to much fuel however you can pick up the stock injectors from a 2.0

ryan.

 

This is why you would need a wideband and a interceptor gauge wouldn't hurt either.

I made a Fuel System/Injector FAQ which I think some people might have overlooked...

http://www.ecotecforum.com/forums/showthread.php?t=2743

It's not needed fuel BUT if someone wanted to, they could put them in with adjustments of the injector duty cycle.

But like said, the only reason to even change them is if you need to from a injector overworking point of view. This is why it's good to have a way to keep track of the IDC of the Injectors. Ideally, you want to start to change them when reaching pass 80% IDC in WOT.

 

MY point exactly. The stockers run about 110% from the factory. When you put in the 34# injectors you run a 76% max IDC. That means that the 34# injectors are near perfect size for the cars.

Other people can continue to live the lie of "GM wouldn't do that to us, and they know what they are doing", but frankly most people here only know what they READ ON THE FORUMS and have no hands on experience.

My 2.0L has 60-65# injectors in it. You could say that is overkill, since they are bigger than injectors that come on the 6.6L Duramax which pushes around 28psi of boost. But when you look at the scans, I have even those things running over 80% IDC, and some other members have those maxed out too.

You guys bitched about not having mods for your 2.4L cars, and I went out and got one for you that no one else had, and told you how to do it. If you don't WANT to do it, fine, if you do want to do it, fine.

 

That sounds perfect than Steve.