What do I need?

Car: corvette 6spd
Engine:

383
hot cam kit
AFR 195 heads
headers
open exhaust

9.7:1 comp

Is my fuel pump enough?

Thanks

 

In the stickies, is a Final Answer, that I detailed what to consider.

 

thank you sir.. :hail:

 

i must be both stupid and blind. Cant find it?

 

Personally, I would run 30lb SVO injectors on that setup. If you needed LOTS of room to grow then I would consider the 36lb SVOs.

FWIW, I am running the 30lb SVOs on my 350 with AFRs, MiniRam, phat cam, longtubes, etc. I pull 82% MAX duty cycles at 6600rpms. Your motor is bigger but cammed smaller and will pull less RPMs. I would hypothesize that your DC's will probably be around what mine are ... if you tune it to around 12.5-13.0 AFR. If you are going to run richer AFRs then your DCs will get pumped up more than they would normally be and make you think you need a bigger injector.

Now, with all that said, I want to say what I have said many times so far. Run the biggest injector you can get away with. The 30lb SVOs (really 33lb according to GM pressures) will work great on your setup. You can probably get away with the 36lb SVOs but I don't know for sure so that is up to you.

Tim

 

thank you !

WHat FP should i run on those injectors?. Must I retune my lower VE when i change over to those?

( i like your setup, alot like mine but i use the lt1 intake, what is your cam spec ? ) ?

Thanks

 

I run ~43psi.
You will probably have to adjust the lower VE curve a bit.
I can't report my cam specs since I made a deal with Joe Overton such that if he ground the cam for me then I wouldn't tell anyone the specs. Gotta keep my word!

Tim

 

Sure I understand.

Why I ask is that I se you run 11s. And thats my goal aswell. I just hope I can reach that with the hotcam and my setup :/

Thanks for the help

 

Hey Traxion, why SVOs over the ACCEL 30lbers?


I've got 24lb svos and I think I'm going to need more injector with the cam I'll be running shortly.

And are these the ones you are refering to:



http://store.summitracing.com/partde...MS%2DM9593B302

 

Those are exactly the ones Don't be fooled by the picture. I ordered mine from Summit also and they will be red-top injectors when you get them. I always recommend the SVOs over the Accel injectors for 3 reasons ...

1) SVOs will always flow more at GM rated pressures. Thus, you get a bigger injector for the money and if you can tune your car it doesn't matter that it is bigger. I have the 30# installed with a 33# injector constant in the PROM. It leaves people more room to grow in the future and IMHO it is better to run a bigger injector than a smaller one.

2) I've heard of too many failures with regard to Accel. Maybe they have fixed the problem because I haven't heard any lately. However, SVO injectors are tried and true ... and have been in use by Ford and GM guys for a long time.

3) Ford stuff is cheaper ... and just as good (ducks and runs for cover). You'll save money and have a better injector.

Now, if price was no object I would recommend something else. But, for our applications the SVOs are perfect.

Tim

 

Sweet RED ones work! Fits the manifold.

 

Tim, Thats a myth I also used to believe in. Check out my data
backing it up here:

https://www.thirdgen.org/techbb2/sho...hreadid=219294

-- Joe

 

Also,

I've spoken to some shops about the fuel pressure issue. I was basicly told that running a huge injector, then running a low pressure is crazy. "On the flowbench, if you look at the spray pattern it would scare you away!"

Tims dead on, OVERINJECT! but make sure you can get away with a high line pressure with whatever injector you choose.

I run my SV0's at 55psi wot, and around 50psi idle/part throttle.
From talking to people, including the guy who flowbenched mine 55psi provides a perfect spray pattern! It also keeps my DC's nice and low.


-- Joe

 

Did you ask Rich if ALL of the SVOs flowed like that? This is extremely curious because Ford rated the SVO injectors at 39psi. I wonder what the deal is. Hmph. Thanks for posting your data!

Tim

 

He said all the Ford injectors he's come across flowed at the SAE pressures. He did however, say the LT1 injectors are rated at a higher pressure, so that we know is true.

I'd love to see some opposing data too. I had some 24# in my car for along time and assumed they were really 26#. But I sold them without ever testing them.

-- Joe

 

With my 24lb SVO injectors at 42psi, i had to change my inj constant to about 27 before i'd get anywhere near ballpark blms when I had TPI and semi stock heads.

So I assume those flowed more than 24 at 42psi.

 

Hrmm. Well that is an interesting observation, but i'd still like to see a flowbench sheet of some 24#s..

-- Joe