Help with injector upgrade
Thread Starter
Racer
Joined: Mar 2002
Posts: 441
Likes: 2
From: Lilburn Ga
Help with injector upgrade
Hey, I have a 91 L98 6 speed vette. This car is not the mass air car. It is speed density. Here is my question. I have a set of 24 pound injectors I would like to install. Will these work in my car with no other mods? What if any gains will I see. Please let me know. I know these will work fine in mass air cars, but I am not sure about the 91's
Melting Slicks
Joined: Aug 2001
Posts: 2,047
Likes: 0
Re: Help with injector upgrade (soundkillr)
I'm not sure what the stock injector size was for your year car. However, by just changing injectors, you really will not see any improvement. Sorry! You need a heck of a lot more air flow for more fuel and more go! The factory typically sets fuel calibrations to yield the best possible fuel mileage with taking into account that the car must also meet emissions.. What does this mean?? Most factory calibrations are set up a little rich. If you turn down the fuel pressure just a hair, you might get 3-5 hp somewhere in the rpm range. Sorry, for not good news! After such changes, you gotta run the car on a dyno with air/fuel data acquisition to make sure that everything's ok.. not mandatory, but a VERY powerful tool. You could sidestep it by pulling plugs after a test drive, but you want max performance, right? The dyno is the way to go!
Le Mans Master
Joined: Jul 2001
Posts: 8,183
Likes: 3
From: Santa Maria, CA
Re: Help with injector upgrade (EricVonHa)
^ Agreed. Maybe a benifit might be that the 24's would operate lower percentage in the duty cycle. The cars do already run a little rich from the factory. I'm gonna include this very blurry/poorly scanned page that helped me decide which poundage I was gonna use for my particular set-up: 
a better place to find out is forum member "65Z01" 's site. He knows his stuff!
a better place to find out is forum member "65Z01" 's site. He knows his stuff!
Pro
Joined: Oct 2001
Posts: 682
Likes: 23
From: loxahatchee fla
Re: Help with injector upgrade (89 Paul in cal)
here use this site to get your correct answer , use a bsf of .45-.50 for normal asperated cars and .55-.65bsf for super charged cars and a .75 duty cycle to insure that if you use nitrious or a supercharger the injectors can keep up and you wont burn pistons.
http://www.smokemup.com/utilities/ca...l_injector.cfm
look heres a site telling how to change the injectors for those of you who don,t do that very often. http://www.thirdgen.org/newdesign/te...ctorswap.shtml
[Modified by grumpyvette, 3:19 PM 3/9/2002]
http://www.smokemup.com/utilities/ca...l_injector.cfm
look heres a site telling how to change the injectors for those of you who don,t do that very often. http://www.thirdgen.org/newdesign/te...ctorswap.shtml
[Modified by grumpyvette, 3:19 PM 3/9/2002]
