87 COMANCHE 2.5L Tbi replacement

[Kikapoo]

Hello, I was wondering if anyone can answer a question. I have 87 comanche 2.5l automatic transmission . I was wondering if I can replace my TBi injector with a Gm tbi injector?

[eaglescout526]

Yes. They’re the same injector. 

[Gojira94]

I admittedly haven't looked up the specs on the factory 2.5 injector and don't know the operating pressure but here's a really good resource:

 

http://www.gearhead-efi.com/Fuel-Injection/showthread.php?81-GM-TBI-Injector-size-color-and-part-numbers

 

Important to remember that the GM injectors ran at 12-13psi, except for the 94-95 454s which ran smaller ones at higher pressure.

 

242ci x .667 = 161.414ci (2.5l displacement in c.i.)   Chevy 305ci / 2 = 152.5ci   (similar displacement, 305 has 2x 54#/hr injectors) if fuel pressure is in the same ballpark, 12-15psi then yeah.

[eaglescout526]

11 minutes ago, Gojira94 said:

if fuel pressure is in the same ballpark, 12-15psi then yeah

Fuel pressure at the throttle body is 15psi max. So he will be fine with a GM one. 
 

I'm assuming the PO is going GM probably because they have a line on some cheap ones or aftermarket is cheaper for GM

[Gojira94]

6 hours ago, eaglescout526 said:

I'm assuming the PO is going GM probably because they have a line on some cheap ones or aftermarket is cheaper for GM

Definitely. Several years ago I got a pair of rebuilt 80pph for my C1500. Running them vacuum referenced at 109pph@23psi WOT/16psi idle. Very nice conical spray pattern with the Rochesters.