Stock '94 LT1 injectors.. 24#?
04-24-2007, 07:48 PM
#8
Le Mans Master
You bring up a good point. I was told that even though the fords are 24 and the gm is 24 the fords flow more like 25.6 on a vette. The difference is the fords are rated at about 38lbs pressure and gm rates at 43 lbs pressure.
But then, I have seen other post saying this is not true. Who knows?
04-24-2007, 08:00 PM
#9
Racer
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Well.....I'm VERY curious because I JUST ordered a set of new Fomo 24's for my 383!
(My ecm is already tuned for 24's)
With all I've read here over the past year, I THINK the Ford 24's will do me just fine. (I'm not one for over-fueling)
(My ecm is already tuned for 24's)
With all I've read here over the past year, I THINK the Ford 24's will do me just fine. (I'm not one for over-fueling)
04-24-2007, 10:16 PM
#11
Race Director
04-24-2007, 10:18 PM
#12
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04-24-2007, 10:25 PM
#13
Melting Slicks
How much difference?
I have a modded Lt-1. SLP Claw, Heads, Hotcam, Internally balanced, crane roller rockers, Headers and no cats. What if I go with a larger throttle body and larger injectors???
04-24-2007, 10:45 PM
#14
Le Mans Master
Thread Starter
04-25-2007, 07:41 AM
#15
Le Mans Master
FWIW here is the info. that I have on the ford injectors. The ford 24 will be about 25.6 on a corvette due to the higher pressure. (38 vs 43 psi) Usually this is not a problem, as it is within the computers control area to correct this change. If not, you can get a chip burned or computer reprogrammed to see the change. Or you can get an adjustable fuel pressure reg. to lower pressure.
As far as will 24 be enough for a 383? Keep in mind that injector size is not really related to the size of an engine, but more the hp output. So alot will depend on cam etc.
Just a point of reference, my car, (see signature) is still running stock injectors (22) and stock fuel pressure. I am on the edge of needing new injectors. Alvin said I am starting to go lean on top end. So with that in mind, a 24 would be fine on mine and a ford, which would be 25.6 would be plenty.
One other thing, be careful using an adjustable regulator to compensate for small injectors, especially stock multitec injectors. They dont like high pressure.
As far as will 24 be enough for a 383? Keep in mind that injector size is not really related to the size of an engine, but more the hp output. So alot will depend on cam etc.
Just a point of reference, my car, (see signature) is still running stock injectors (22) and stock fuel pressure. I am on the edge of needing new injectors. Alvin said I am starting to go lean on top end. So with that in mind, a 24 would be fine on mine and a ford, which would be 25.6 would be plenty.
One other thing, be careful using an adjustable regulator to compensate for small injectors, especially stock multitec injectors. They dont like high pressure.
04-25-2007, 09:59 AM
#16
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93Ragtop,
Thanks for the info. Very helpful. I've not dyno'd yet, so have no A/F numbers to work from. By guess and by golly right now.
Reading your mods, mine is similar, except for a bit more cam and of course more cubes.
But darn it all! I don't have an Airfoil yet!
Thanks for the info. Very helpful. I've not dyno'd yet, so have no A/F numbers to work from. By guess and by golly right now.
Reading your mods, mine is similar, except for a bit more cam and of course more cubes.
But darn it all! I don't have an Airfoil yet!
04-25-2007, 11:02 AM
#17
Le Mans Master
04-25-2007, 03:21 PM
#19
Race Director
Multec from '89 on, and interesting article:
http://www.corvettefever.com/techart...n/systems.html
The injector styles changed during TPI production. For '85 and '86 production, GM used Bosch injectors in the Corvette. During all of '87 and part of '88, Lucas injectors were installed. In '89, GM went to Multec injectors and used them up through the end of C4 production. GM switched to the Multec injector partly because they were a ball design instead of the pintle like the Bosch-style injector. This means that the ball constantly rotates, which helps eliminate buildup and gives the injector a different seating surface each time, reducing wear on the seats. Also, the Multec injector is higher in the intake, which prevents fouling the tip of the injector. The Multec injector is designed to allow the fuel to flow over the coils of the injector, which helps cool the coils. This can pose a problem if chemicals are used to clean the injectors. Since the fuel flows over the injector coil, so does the injector cleaner. Harsh chemicals in the injector cleaner can deteriorate the protective coating on the coils of the injectors and destroy the injector.
An approved injector cleaner is available from GM; but most of the time, if the injector is not working properly it will need to be replaced. Using good quality fuel is one of the best ways to ensure long life for your fuel injectors. This eliminates the need for cleaners and helps prevent water in the fuel system. When changing injectors, be sure to install the injectors that have the same resistance as the originals. The Multec injectors have around 12.8 ohms of resistance. You can change injectors within a couple of ohms difference, but if you start going too far away from the originals, you'll have problems. Even performance injectors should have around the same ohms of resistance as the originals.
http://www.corvettefever.com/techart...n/systems.html
The injector styles changed during TPI production. For '85 and '86 production, GM used Bosch injectors in the Corvette. During all of '87 and part of '88, Lucas injectors were installed. In '89, GM went to Multec injectors and used them up through the end of C4 production. GM switched to the Multec injector partly because they were a ball design instead of the pintle like the Bosch-style injector. This means that the ball constantly rotates, which helps eliminate buildup and gives the injector a different seating surface each time, reducing wear on the seats. Also, the Multec injector is higher in the intake, which prevents fouling the tip of the injector. The Multec injector is designed to allow the fuel to flow over the coils of the injector, which helps cool the coils. This can pose a problem if chemicals are used to clean the injectors. Since the fuel flows over the injector coil, so does the injector cleaner. Harsh chemicals in the injector cleaner can deteriorate the protective coating on the coils of the injectors and destroy the injector.
An approved injector cleaner is available from GM; but most of the time, if the injector is not working properly it will need to be replaced. Using good quality fuel is one of the best ways to ensure long life for your fuel injectors. This eliminates the need for cleaners and helps prevent water in the fuel system. When changing injectors, be sure to install the injectors that have the same resistance as the originals. The Multec injectors have around 12.8 ohms of resistance. You can change injectors within a couple of ohms difference, but if you start going too far away from the originals, you'll have problems. Even performance injectors should have around the same ohms of resistance as the originals.
