kanaka4rmcali

was thinking about getting a eddlebrock dual intake manifod, but was recommended some fuel injectors? what can fuel injectors do to my 305 (all stock 305), what are some pros and cons (if any)

InjectorsPlus

iTrader: (1)

Stock are 19 lbs. If you plan on doing some more mods, I'd go with 22s. The car will run slightly richer in the cold, but OK once it warms up.

As far as performance, new injectors will make the car start easier, run smoother, and accelerate better. BUT they will not add any HP.

As far as pros and cons, injectors are a wear item. They need to be replaced probably once in the lifetime of the car, unless you do mods.

Give me a call, we'll figure something out.

hellz_wings

iTrader: (2)

Hmm i'm not sure about TBI but I'm pretty sure this applied to that particular intake, but for TPI when you change an injector you need to modify the BIN in the PROM in order for the computer to recognize the change in injector size. It might not run good, or it might run good, that depends on the setup. The fuel tables in the BIN might also need changing since they are all calibrated for a 19lbs injector. I have done many mods to my 305 and am making around 271 HP at the moment with the STOCK 19lbs injectors.. Going to bigger might net me a gain (if the 19's were holding me back) or simply the fact that (as you mentioned above) they are new might make it start and run better.

xch3no2

Umm oops John, TBI, the two big injectors on top...

Don't change injectors, use stock, flow matched.
Like wings said..

Raise pressure, get an EBL.

Elvis has left.

DSGx

Yeah if all your changing is your intake manifold i dont see why u want bigger injectors, keep the stock ones and buy your self an adjustable preassure regulator or make ur stock one adjustable, if u put bigger injectors your motor is just gonna run rich and waste fuel and lower performance unless u already have more mods like bigger cam and better flowing heads that actually need more fuel than stock, also as xch3no2 said ur stock fuel injectors should be enough if ur motor is stock , as he said get the EBL its just far better for tuning than the stock ecm.

InjectorsPlus

iTrader: (1)

TBI, TBI,TBI.....ok brain fart....sorry.

The story stays the same, just the flow changes!

I immediately go TPI.....

kanaka4rmcali

So according to what you guys are saying to me its not really worth it right now, but the reason why I asked is b/c I'm looking to get a new intake manifold for more torque, besides a new manifol what are some other ugrades I can do to my 305 for more torque?

Doom86

The intake manifold isn't worth swapping on it's own. It's completely adequate for everything over and under it.

kanaka4rmcali

So what would you recommend to upgrade

InjectorsPlus

iTrader: (1)

If your injectors are good, don't change them. The rest....what Doom said.

Doom86

This is well documented in the stickies and its talked about a lot searching you will find a lot of information.

The short version;

Headers
Exhaust
Cold Air/Open element air cleaner
heads
cam
intake manifold
ignition
fuel
ECM
lots of tuning through out


You may want to throw a bigger bore block in the mix somewhere along the lines. All of the "options" after the air cleaner are questionable of when you do them in relation to one and other because they all work together. They are best done all at once.

Also the rear end gear and trans play a big role in how a car accelerates.

kanaka4rmcali

Well all of these recommendations that you gave me will it give me enough performance to compete with a 5.7 and also what type of headers would you will be best, since that is on the top of your list

Doom86

Hooker 2055 or whatever your emissions call for or you can afford. Any header made by any manufacture is far better then a 305 manifold.

Buy headers for a TPI 350 with a single cat if you want to search around.

kanaka4rmcali

What will hooker headers bring to the table for me that an intake manifold won't, nd keep in mind that my engine is all stock TBI 305. Also why and will the 2055 TPI 350 fit my 305 TBI

DSGx

The reason why headers are better than a manifold swap on our stock TBI 305s is cuz the stock cylinder heads are so bad that having the best and most expensive manifold sitting on such crappy breathing heads will pretty much do nothing, however TBI heads flow decend numbers on the exhaust even being stock, infact they flow more on the exhaust than the 305tpi and 350 tpi heads, open up your hood and look at those exhaust manifolds, the opening in the end is like one inch , followed by a dinky 1 and half inch y-pipe tube that no person would even put on the weakest of 4 cylinders, doing a full exhaust on the l03 with some decend headers back to 2.5/3 inch pipes to the tips will net you possibly more than 25horses right there, the engine will just exhale better like its suppost to, get the EBL and tune it and ull see how much your stock TBI motor changes with just an exhaust upgrade, not saying that u will see more than 200hp to the wheels with headers alone but the difference will be felt. After u have become familiar with tuning u should then look at heads/intake/cam upgrades , im positive that with those bolts on i dont see why an l03 would not be able to make more than 220 hp to the wheels, that does not sound like a lot but sure as hell beats 150hp to the wheels wich is what most l03s put to the ground stock.

hellz_wings

iTrader: (2)

YOur intake manifold flows enough air for what your engine needs right now, but no the exhaust side the 305 manifolds and exhaust are restrictive, so changing out the manifold for a set of good flowing headers will net you more HP/TQ compared to the manifold, if any. Same goes for air going into the engine... Then you have to look into the engine for restrictions like heads/cam and that has to work together so when you do that part make sure you do it all at once as stated above so that you don't mix and match parts that don't work together cuz you will not have optimal performance gains.

kanaka4rmcali

when ur talkin about do everything at once so that everything fits, what parts would i have to do all at once, i know that the intake manifold nd the headers but what else. and what brands and type of the parts do you think would be best

hellz_wings

iTrader: (2)

im not knowledgeable enough to give you the exact brands, but i know heads and cam have to work together.. the headers / intake can do one at a time but those are usually the first things you would do to increase performance before heads/cam.

kanaka4rmcali

ok so ur suggesting that the headers and intake can be done together or separate, but the heads and cams have to work together. but if i were to go with the hooker headers 2055 and an dual eddlebrock manifold, what then would you recommend for the heads and cams?

DSGx

Most ppl seem to like the vortec head/lt1 cam combo for a nice performance bump on 305 and 350 TBI, do remember if you do put vortec 350(l31) heads on the l03 u will need to mill them down or else u will loose compression and prolly not gain its full performance, also if u know how to do porting pretty well u can port the heads that the engine has right now but at most ur gonna have to install bigger intake valves and do a lot of porting to even match a stock vortec head. Before you dive into a cam and head swap i would recoment u buy the EBL system, u can start tuning your stock motor and learn alot about how to do it, even the stock l03 with full exhaust done only and EBL tuned can get pretty nice performance increase over the stock tune. That is what im doing after i get my exhaust finished, atm i only got full mandrel bend pipes of 2.5in from the stock y-pipe back, soon ill be able to finally get headers and better ypipe and then get the EBL and start learning how to tune the system so im ready when the time comes for a cam and heads to go in.

kanaka4rmcali

ok thanks, but can you explain to me what you mean by mill them down and what you mean by "porting". its just this is my first camaro nd im kinda new to everything

hellz_wings

iTrader: (2)

porting means to enlarge the holes where the air flows in and out .. and i think milling is when they shave the bottom of the head so that the head is lower and there's less room in the combustion chamber thus increasing compression because of the small combustion chamber area.

xch3no2

ok but let's not say "enlarge the holes" please, that statement just ain't right, and kinda offensive to those of us that do headwork.

The proper definition would be to "shape in an advantageous fashion or contour".

kanaka4rmcali

welll i just did some research and noticed that the hooker header 2055 only fits for TPI, will it work with my TBI. and which tube length is better the long, or the shorty?

xch3no2

First 2055's will fit the engine fine, its the y pipe that is 3" (larger than stock) which is fine cuz you wanna run that size anyway, hi-flow cat & back.

Do you need the A.I.R. (emission testing where you are at?) pipes? Just wondering.

Long tube headers have a better cyl to cyl isolation that is good for high rpm (4000+). Shortys tend to be stronger, less leak prone & have an easier/ cleaner install.

DSGx

Headers for tpi will fit the tbi just fine, its the same exhaust configuration up until the ypipe since some thirdgens had dual cats. Hooker 2055s, 3inypipe and 3incatback should give the little l03 some difference in power, the stock exhaust is so tiny and restrictive that i wont even put that stuff in a weak 4 cylinder, thats how shitty stock 3rdgen exhaust is.

Gallileo60

I on a regular basis trounce 350 TPI cars with my LO3 motor.(not all of them).freaks them out, but I have just about every bolt on know to man..Eddy intake too...

tom1980

looking to get more hp out of my tpi 305 what can i do to do this?