24s or 30s

347lxvert · Sep 4, 2006

i have a 347 with 8.5:1 compression and i am going to spray probably 150 wet shot to it, should i go with 24 lb injectors or 30 lb injectors?

Grn92LX · Sep 4, 2006

Depends on the combo. The 30's could be the ticket or WAY too small. We don't know, you didn't tell us.

347lxvert · Sep 4, 2006

what else do you need to know??? i will tell you as much as i know

Grn92LX · Sep 4, 2006

Your h/c/i combo. How high you're revving..

04sleeper · Sep 4, 2006

I would run 42's.

347lxvert · Sep 4, 2006

i have performer heads that have been ported out, a trick flow street heat intake, 70 mm tb, and a power adder cam, the motor made 525 hp with 8 lbs of boost, i am just going to go with nitrous instead for the power adder. i dont know the exact specs on the cam, but it did real nice with my blower before it crapped out.

04sleeper · Sep 4, 2006

Waht size injectors were you running before?

347lxvert · Sep 4, 2006

i have 42s right now with the supercharger, but i think it is way too much fuel for everyday driving.

04sleeper · Sep 4, 2006

347lxvert said:
i have 42s right now with the supercharger, but i think it is way too much fuel for everyday driving.

No its not.

The car should run fine with 42's. Even on motor.

You will just need a mass air calibrated for N/A for 42's.

347lxvert · Sep 4, 2006

why were my headers glowing when mt supercgarger quit then? i thought it was too much fuel

cj99 · Sep 4, 2006

sound like it was lean (hotter) that means not enough fuel
to much fuel and it would make the exhaust cooler not hotter

347lxvert · Sep 4, 2006

thanks for the info, 42 lbers just seem like too much, my brother had 30 lbers on his 331 and it smelled like gas all the time when we drove it, that is why i was thinking 30 lbers as a max.

5spd GT · Sep 5, 2006

The headers glowing red hot is usually from unburned gas making it into the exhaust chamber. This was signify to rich.

For your blown combo...the 42's were just fine.

Your right, without a "chip" tune or something similar...you will get that fuel smell a lot...

I did after adding 30lb injectors to my h/c/i combo. I wish I would have gotten 24's.

I think 30lb injectors would be sufficient.

I would listen to Kevin (04Sleeper) on the what injector to get.

I have noticed more of a low rpm surge after adding bigger injectors as well.

347lxvert · Sep 5, 2006

5spd GT said:
The headers glowing red hot is usually from unburned gas making it into the exhaust chamber. This was signify to rich.

For your blown combo...the 42's were just fine.

Your right, without a "chip" tune or something similar...you will get that fuel smell a lot...

I did after adding 30lb injectors to my h/c/i combo. I wish I would have gotten 24's.

I think 30lb injectors would be sufficient.

I would listen to Kevin (04Sleeper) on the what injector to get.

I have noticed more of a low rpm surge after adding bigger injectors as well.

your car runs well at the track, does your car smell like gas with the 30's?

04sleeper · Sep 5, 2006

Either way you will need to have your car tuned.

A buddy of mine ran a similar combo with a 331. N/A it made 406 RWHP and he had a 125 shot on it as well. The car ran just fine with the 42's and an 80mm Pro-M. (He thought the same thing about being too big until he ran them)

You will need the extra fuel with the spray and having a bigger injector just lets you have more room to grow, but with a 347 and a 150 shot you need it anyway, even with a wet shot.

Fuel smell can come from several things. When you seem to smell gas and it burns your eyes it can be from running lean. I have witnessed this personally on a dyno and you would swear that it was running rich when actually it was running lean. Sometimes the smell comes from the tank vent or bypassing the charcoal canister.

Just a few things to think about.

5spd GT · Sep 5, 2006

347lxvert said:
your car runs well at the track, does your car smell like gas with the 30's?

Yeah, it does. Of course you don't smell it at the track...to many people just like me

It didn't smell like it did with 19lb injectors.

The car runs fine and I get good gas mileage...but it gives a rich idle and I think an overall rich powerband. I have gotten 24mpg before (23.9x) to be exact...with no tune, and that is how the car remains, untuned.

My charcoal canister hasn't been bypassed and I first noticed after the h/c/i swap. I also smell it when driving real slow...

347lxvert · Sep 5, 2006

what is your fuel pressure and timing set at?

dwhiskie · Sep 5, 2006

I run #30, fuel pressure is at 42 with vac line off and plugged and timming is at 12* spout out but my compression is 10.1 so you should be able to run more timming.

347lxvert · Sep 5, 2006

hey dwhiskie, do you have a real strong gas smell when driving down the road?

5spd GT · Sep 6, 2006

347lxvert said:
what is your fuel pressure and timing set at?

My fuel pressure is at 39psi with the vacuum line off and plugged. The factory ECU wants to see in the range of 38-40psi, so I centered it

My timing is 16*.

I don't have a strong fuel smell going down the road, just at idle or idle type speeds...it is noticeable but the car runs good.

24s or 30s

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