91 swap Q's
 

~alright can i use an in line fuel pump? ~
~also what do i need for the speedo and tac to work? i have a painless harness.
~how about the throttle cable or can u just swap out the old one with one from a 98 or newer?
if any one has answers let me no! thanks :c :confused:

You'll find a vast wealth of info here on the LS1/3rd gen swap. Do a search on your questions and you'll find the answers to everything you want to know.

fuelpump:

you COULD.... but you would be sucking thru your tiny stock TBI pump... and that kinda sucks. good chance that you cant pull enough fuel thru it.

a walbro is a direct replacement, i mean DIRECT REPLACEMENT, and it works great..... your other option is any replacement TPI pump... athough i would not reccomend a cheapie.
ive done the job countless times now on alot of cars... its never a enjoyable job, but it doesnt have to be too hard. if the exhaust isnt on the car, its downright easy.



speedo:
with a stock harness, you can wire it to the gauge... with the painless, look at the directions..

tach:
get a tach converter box off of ebay, search for "LS1 tach adapter"
it uses 4 wires:
tach in from ls1
tach out to gauge
power
ground.



throttle cable:
use a non TCS LS1 cable... the GM part number is :12565559

you may have to use a small spacer on the cable near the pedal to achieve WOT.. check this.

Wooo Hooo!! Our third 1991 thirdgen about to receive an LS1 in the same week!

fuelpump:

you COULD.... but you would be sucking thru your tiny stock TBI pump... and that kinda sucks. good chance that you cant pull enough fuel thru it.

a walbro is a direct replacement, i mean DIRECT REPLACEMENT, and it works great..... your other option is any replacement TPI pump... athough i would not reccomend a cheapie.
ive done the job countless times now on alot of cars... its never a enjoyable job, but it doesnt have to be too hard. if the exhaust isnt on the car, its downright easy

>i had to replace the gass tank for the second time on the car and i pulled the stock tbi pump and replaced the legnth of the pump with a pice of gas line . will it work ? the tanks are a pain!!!

Or just take the gas pedal off and bend it a little bit and test it to see if you're achieving WOT...Test and repeat untill you do, worked good for me.

WILL ANY TACH ADAPTER WORK??? because theres nothing really spicified onebay about what car its for?

The LS1 has a 4cyl signal , any adapter that allows you to adapt a 4cyl signal to an 8cyl signal will work.

so what are you using for a pump now?
you could use a aftermarket inline pump.. its not as efficent, not as quiet, and wont last as long.. and you'll have to find a place near the back of the motor to put it, but i'll work... not the ideal (or cheapest) solution, but it saves you the "work" of dropping the tank.

however, my blunt opinion of doing that on a 91 camaro is: "thats a hackjob way of doing it. if you're going to be lazy, then why bother?"



i needed over a 1/2" of spacing... can you bend the pedal that much? i didnt try.. i just did the "mustang pedal trick"....

yea, any 4cyl->8cyl tach adapter works..
here are the ones on ebay i was thinking of...
http://stores.ebay.com/Baker-Electro...eNameZl2QQtZkm

well heres the story i baught a ls1 for a guy i no , the motor had 9500 miles on it , he slod the rear end and motor to me for $ 2100 wich is a steal cuz its fully assembeld it came with raidiator trans cooler, motor mounts wich didnt help me, stock air box, manifolds y pipe, inline fuel pump and relay, ecm . for 2100 i thought it was a good deal? any ways thats why i was going to use the in line pump cuz it cam with the motor? i dont want it to be a hack job alouth im not a pro at this but have a lil experience with cars. but the inline will work im just trying to save a few bucks cuz i already have the pump!

one more quick Q about the tach signal it say if the car had a different amount of cylinders ? the car had a 305 in it ? im not the best with electrical so thats why im asking

what is this "LS1" out of? the fbody ones have a intank pump.. and i assume the vettes did too... i dont know about the trucks....

it was pulled from a 99 z 28!

the 305 is a v8.... a standard "normal" tach signal would be 4 pulses per revolution... every time the distributor fires, it gives a pulse... the tach reads that and moves the needle.

the LS1 has no distributor.... so it doesnt make a "normal" tach signal.. but the PCM outputs a 2 pulse per revolution signal... like a 4cyl....

this box takes that "4cyl" 2 pulses and makes a "8cyl" 4 pulse signal... so your stock V8 tach can read it.

then it has a intank pump. you're probly looking at teh fuel filter then... common mistake, they do look kinda like inline fuel pumps.

why dose it have a ground and a pos wire running from it? thanks for clearing the tach signal thing up!

the fuel pump has a black foam coating around it and has fitting on each end and looks nothing like the intank pumps ???

not to keep jumping form topic to topic but i have so many Q i dont want to forget them! what r u using for a air filter set up? and do i need a fuel pressure regulator?just wanted to post these before i forgot dont need answer on them right away i want to figure out the fuel pump first

it does have a ground wire/strap... no positive connection.

you might have a intank pump there... does it look like this:?

http://proficientperformance.com/ima...lbro_pumps.jpg



if you do have a inline pump, its not stock..



see my post here:
https://ls1tech.com/forums/conversions-swaps/301901-air-intake-question-67-el-camino-ls1m6.html


read this thread and the threads linked to it.
https://ls1tech.com/forums/conversions-swaps/299420-fuel-delivery-questions.html

yes you need the pressure regulated.... easiest and cheapest method is a corvette filter/regulator.... the regulator is built into the filter.... and because the filter is ment to be replaced, its cheap....

The tach signal is a negative AC signal unlike a DC pattern which requires 12v+ and 12v- .