injector questions.....
07-09-2006, 01:41 AM
#1
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injector questions..... I have left over stock 36lbs injectors from my dailey driver GTP....would these work on my LT1??? I have 28lbs as well from a GT model...
would these work?
would these work?
07-11-2006, 04:47 AM
#5
Originally Posted by Alex94TAGT
The LT1 fuel pressure is 43.5psi (3bar)
Assuming Slomofo's numbers are correct, the GTP 36# injectors will perform like 34.63# injectors on your LT1.
Assuming Slomofo's numbers are correct, the GTP 36# injectors will perform like 34.63# injectors on your LT1.
I then found out they were 30's @ 47 psi, and around 24's at 43.5
07-11-2006, 11:05 AM
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GTP PWR -- don't suppose we could get a part number off of those injectors? That way, we could be certain.
Well, from what I can gather, the GTP's had a fuel pressure range of 48-55psi (without vacuum / WOT) -- with a median of ~52psi. However, that doesn't necessarily mean that the injectors were rated at that fuel pressure. It appears they were actually rated at 3.5BAR, or 50.75psi.
It's arguable that 42-47psi is within the 'normal' range for our LT1's, but ~51psi is a bit more of a change.
*At any rate, the formula for converting fuel injectors by fuel pressure is as follows:
sqrt(New fuel pressure / Old fuel pressure) * Old injector size = New injector size.
Assuming the 50.75psi number, that would mean 36# injectors would equate to 33.32# injectors with our 43.5psi. Again, from my last post, they would perform like 34.63# injectors in our cars if they were originally rated at 47psi.
Slomofo -- If your 24# number were correct, that would require that the GTP fuel pressure was actually closer to 67.97psi (to enduce such a drop from 30#). Again, using that 50.75psi estimate, your 30# injectors would actually perform like 27.77# injectors at our 43.5psi. Using your estimate of 47psi, those 30# injectors would perform like 28.86# injectors at our 43.5psi.
Well, from what I can gather, the GTP's had a fuel pressure range of 48-55psi (without vacuum / WOT) -- with a median of ~52psi. However, that doesn't necessarily mean that the injectors were rated at that fuel pressure. It appears they were actually rated at 3.5BAR, or 50.75psi.
It's arguable that 42-47psi is within the 'normal' range for our LT1's, but ~51psi is a bit more of a change.
*At any rate, the formula for converting fuel injectors by fuel pressure is as follows:
sqrt(New fuel pressure / Old fuel pressure) * Old injector size = New injector size.
Assuming the 50.75psi number, that would mean 36# injectors would equate to 33.32# injectors with our 43.5psi. Again, from my last post, they would perform like 34.63# injectors in our cars if they were originally rated at 47psi.
Slomofo -- If your 24# number were correct, that would require that the GTP fuel pressure was actually closer to 67.97psi (to enduce such a drop from 30#). Again, using that 50.75psi estimate, your 30# injectors would actually perform like 27.77# injectors at our 43.5psi. Using your estimate of 47psi, those 30# injectors would perform like 28.86# injectors at our 43.5psi.
07-11-2006, 11:28 AM
#7
Originally Posted by Alex94TAGT
Slomofo -- If your 24# number were correct, that would require that the GTP fuel pressure was actually closer to 67.97psi (to enduce such a drop from 30#). Again, using that 50.75psi estimate, your 30# injectors would actually perform like 27.77# injectors at our 43.5psi. Using your estimate of 47psi, those 30# injectors would perform like 28.86# injectors at our 43.5psi.
Thanks for the info though, very usefull
