ls1 fuel injection system

[84ttops]

hey all,
im new to the site, I DID try to find info on the site about my situation prior to posting this and haven't had much luck, or i didn't read the right threads... I have an 84 cutlass, will be dropping a gen 1 sbc in it with a decent amount of work and a pretty agressive cam... im tired of running and tuning carbs and tired of getting 7 mpg on stock 307 while going down hill with the wind behind me.... i have heard of people taking the 2000'ish f-body ls1 computer/wiring harness/fuel set up and running it on gen 1 motors with the right distributor and other small changes to mount crank position censor and other small stuff..... can anyone give me any info/advice/tips on this? leaning towards using auto trans. has anyone done this in a g-body? how much power can the ls1 computer handle?

 

[bigmandengo]

try efi connection

 

[RITTER]

The LT1 is a more popular system to use since you can use the entire top end from an LT1 engine (after drilling a hole in the intake for the distributor)
I have personally never heard of using the LSx computer systems on a GEN I style GM engine :?

They also make complete aftermarket EFI kits for GEN I engines, probably be just as expensive to fab an LSx injection system.

 

[84ttops]

ok other than running a tpi and a tbi(too limiting) is there a cheap fuel inj. system i can steal off of a modern day car? or a cheap after market one?

 

[megaladon6]

the gen 1 vortec engines (96-98/99) were multi-port. but you need the dual intake setup.
or get the GM ramjet system, it's relatively cheap.
it might be possible to use the injection system and computer from a LS, but i don't know that it's worth it. your best bet is to get a system that controls fuel and spark. just having one doesn't really accomplish much.

 

[84ttops]

ok thanks for the info, thats pretty damn helpful actually...and im glad you mentioned the spark timing, i never thought about that part

 

[custom442]

84 ttops - the ls1 computer doesn't have a power 'limit'. It's at the simplest, air fuel tables, and you can adjust them however you want. You're ultimately limited by injector size, spark, and engine build. There are dozens of other variables, its not this simple. There is an option with tuning software companies to go from a mass air flow sensor tune to a speed density tune, taking out more variables from the equation.

My advice to you is if you are going to use LS injection and the computer, run ls style ignition. If you feel comfortable tuning yourself and want to learn, switch over to speed density and tune yourself in real time (you can do this on a stock ls computer by just disabling the MAF sensor, but it is limited by atmospheric pressure = no boost). If you just want the benefits of what the system is, run a MAF sensor and have it dyno tuned.

x2 efi connection will help a lot here
check out megasquirt also, they may be able to help you out with a different option to save $$ that you may not have considered

megaladon - he can run fuel injection without spark upgrade easily, there would be many benefits even without having spark control.

 

[megaladon6]

didn't say he couldn't but precise fuel flow control doesn't accomplish much extra without having it light off at the right time. unless you're running a direct injection or high compression system there's a lot of leeway in fuel timing.

 

[custom442]

didn't say he couldn't but precise fuel flow control doesn't accomplish much extra without having it light off at the right time. unless you're running a direct injection or high compression system there's a lot of leeway in fuel timing.

True, he would benefit from an ignition conversion, but its also very expensive.

but with an aftermarket air fuel ratio gauge and msd ignition/controller he could do just as well. It would make more mileage than his carb setup now and have that driveability.

I was under the impression he wanted an lt1 or ls1 style port injection.

If he's using a tbi, he might as well get an aftermarket tbi injector system or leave it carbed.