changing injectors
Thread Starter
Le Mans Master
Joined: Apr 2000
Posts: 5,713
Likes: 105
From: Manassas VA
changing injectors
If I was to change the injectors from the stock injector in my car to a 30lb ford svo injector, is just changing the injector constant from 23.8 to 30 all that is required? Thanks in advance.
Le Mans Master
Joined: Jun 2001
Posts: 6,694
Likes: 3
From: Less Talk, More WOT | Houston TX
Originally Posted by 93 ragtop
If I was to change the injectors from the stock injector in my car to a 30lb ford svo injector, is just changing the injector constant from 23.8 to 30 all that is required? Thanks in advance.
Thread Starter
Le Mans Master
Joined: Apr 2000
Posts: 5,713
Likes: 105
From: Manassas VA
Thanks to everyone for the info. But I have a couple more questions.
1. Why is it that just changing the injector constant will not bring the tune back in line, assuming it was ok before and the change was just the injectors. I am not doubting anyone, just trying to understand.
2. I switched the injectors this evening and Im concerned with the fit. I understand the clips are really not needed, that they are there to hold the injector to the rail during assy. But I noticed the measurement from the top seal to the bottom seal is about 1/8 in. less then the factory injectors. Because of this, the bottom o-ring is not going all the way into the manifold. Is there something there I am missing?
1. Why is it that just changing the injector constant will not bring the tune back in line, assuming it was ok before and the change was just the injectors. I am not doubting anyone, just trying to understand.
2. I switched the injectors this evening and Im concerned with the fit. I understand the clips are really not needed, that they are there to hold the injector to the rail during assy. But I noticed the measurement from the top seal to the bottom seal is about 1/8 in. less then the factory injectors. Because of this, the bottom o-ring is not going all the way into the manifold. Is there something there I am missing?
Melting Slicks
Joined: Jun 1999
Posts: 2,949
Likes: 23
From: Bowling Green KY
Just change the injector constant and you should be fine. I just went from 24 pounders to 42 pounders - all I did was change the injector constant and the car runs GREAT.
If you have the injector constant correct the computer will figure it out.
I went with Ford/Bosch green tops.
Though probably not completely necessary, to make the injector fit like the stock injector I took a hacksaw and very lightly made the bottom groove go the full 360 so I could use my stock clip in the groove. Works great.
If you have the injector constant correct the computer will figure it out.
I went with Ford/Bosch green tops.
Though probably not completely necessary, to make the injector fit like the stock injector I took a hacksaw and very lightly made the bottom groove go the full 360 so I could use my stock clip in the groove. Works great.
Le Mans Master
Joined: Jun 2001
Posts: 6,694
Likes: 3
From: Less Talk, More WOT | Houston TX
Originally Posted by Zepher
With the ford 30lbs SVO's, you may need to set the inj constant to 33 since they are rated at 30lbs at 39psi.
That is a wives tale, they are rated at the same 43.5 psi that GM injectors are rated at.
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