Jason94z

iTrader: (3)

Ok so I am going to wide band dyno tune in a couple weeks.

I have 24's in the car now but want to have a set on hand in case wideband shows it is running out. Do I just buy some and sell them after? Should I just get 30's?

If I dont do it all the same day I will have to wait a few weeks until the tuner is back in the country again so I want to be prepared.

Thanks

95mysticta

iTrader: (4)

I think you should bump up to something bigger then a 30. Im almost maxing out my 30s with a much smaller cam. Id think a set of 34-36lbers are in order. Throw them in and change your injector settings and just dont beat on it untill Claudio has your tune inline to then go WOT with it! GL

96capricemgr

iTrader: (1)

30lbs injectors represents a 25% capacity increase. If it is going a little lean but still running reasonably up top then the 24lbs can't be all that far off. So the 30lbs would certainly be sufficient if you do find it somewhat lean on the 24s.

Jason94z

iTrader: (3)

It will be hopefully 360 to 420 whp, maybe more ?

95mystic what HP are you putting down with with those injectors? They seem huge to me!

96TransAmboosted

iTrader: (8)

i have a set of 36 for sale 150 shipped. pm for more info

95mysticta

iTrader: (4)

Numbers are in my sig. Not sure if its just me but if he isnt maxing out his 24 injectors would there not be an issue and low on power? His 306/AFR 190s combo should be well in the area of 400rwhp in proper running condition. If im maxing out my 30s at 376rwhp with a much smaller cam i would think he would need a bit bigger injector once tuned and dialed in making the power it should be. Heck my other car with a hotcam runs on the stock 24 injectors lol. Im not techy on injectors but thats from my experience and thoughts.

GIZMO

iTrader: (8)

There is no way that you are maxing out 30 lb injectors at 376 rwhp.

What does the rest of your fuel system look like?

95mysticta

iTrader: (4)

new walbro 255 and hotwire kit and accell 30lb with 88% duty cyle at WOT

warriorcustoms

iTrader: (10)

420 @ the wheels Close to 500 on the motor The injector calculator says 39.06 So if youve got an adjustable fuel pressure regulator 36s or 38s will work IF your runnin the stock regulator Id go with 40 or 42lb injectors 42lb injectors max out around 605hp @ the crank My 396 build is gettin 42s with an afpr

nitrous2fast

iTrader: (2)

Threads like these always give me the giggles....

GIZMO

iTrader: (8)

Jr.Samples

Agree reminds me of back in the day kids arguing that a bigger carb gives you more street cred or something,

SS RRR

iTrader: (2)

I agree with my good friend, Gizzy on this one. I had stock fuel system, injectors and pump putting out 370/355 and running 12.0's to 12.2's at 114-115mph. Fuel curve looked great throughout the rpm band.

Jason94z

iTrader: (3)

Giggles? please explain I'm trying to learn and do the right thing!

gregrob

iTrader: (8)

A 28# injector would be fine for you.. you don't want to go any bigger than you absolutely need.

96capricemgr

iTrader: (1)

I assumed it was a reference to the sizing debate here.
https://ls1tech.com/forums/lt1-lt4-m...me-decide.html
Several people including GIZMO have documented gains using as small an injector as possible.
One person has reported gains by staying within traditionally recommended duty cycle limits.
Sadly it seems I was the only one interested in figuring out why we have reputable, intelligent people coming to such opposing conclusions so the discussion died.

Jason94z

iTrader: (3)

My tuner in 1990s picked up over 5mph in the 1/4 going from 30s to 24s but now since so much knowledge is available the masses are telling me to run bigger. So during my dyno tune I want to swap injectors to see what happens. 30s or 36s? That is the question

GIZMO

iTrader: (8)

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.

warriorcustoms

iTrader: (10)

I use an injector calculator Dunno what the hell those ******* are usin If you wanna run em lean itll be mean but wont last long lol The OP said possible 420 Whp that @ the wheels So flywheel is close to 500 Plug it in the calculator it says 39.06 N/A , 46.87 turbo & 48.82 supercharged Take it for what it is I am a professional Seadoo , Suzuki , Yamaha & Chrysler tech Im 40 yrs old not some punk kid takin a wild *** guess LoL

GIZMO

iTrader: (8)

I've been using a dyno and just a little track time. I guess I am really messing up by running 24's (SVO @ 50 PSI).