calling LS swaped guys
 

ok im swaping a lq9 or a lq4 into my 1979 bonanza and i have a question for you guys.

im wanting to know what is the most basic things you need to start a lq4 or lq9. i know i need a computer reflashed with certain things diabled and VATS turned off, and the harness and fuel pump but what else do i need if anything.

this is just to start the engine, no driving or anything just to simply fire the engine

your help is greatly appreciated

Re: calling LS swaped guys
 

you can go with a carb and MSD box firing the coil packs.......with no computer if that bothers you.

Re: calling LS swaped guys
 

yea im trying to stay away from carbed engines now, ive run them for years and tuned them for years and im just wanting to run the stock fuel injection system on a new motor in my trail truck/ DD.

Re: calling LS swaped guys
 

VATS removed is #1.
then it boils down to Air/Fuel/spark.
air should be easy.
Fuel is going to need Fuel pump regulated at 58PSI at the rail and then spark is to make sure the coils are firing properly.
Helps to have IAT hooked up, MAF if you have it, and ECT (coolant Temp) sensor hooked up.

Re: calling LS swaped guys
 

ok cool thanks man that what i was wanting to hear

Re: calling LS swaped guys
 

what harness are you running?

Re: calling LS swaped guys
 

WHO?
I am using the stock harness with Current Performance DIY relay/fuse block.

It needs some 'purtying up' but it works
http://www.herronperformance.com/ass.../Fuseblock.jpg

Re: calling LS swaped guys
 

im wanting to run a stock harness but i havent really got that far on my engine build yet, right now im trying to button up a bunch of loose ends on my trucks frame and stuff. ill post some pics when i take some of the frame its a 4x4 resto/ trail built daily driver lol.

any advice on which computers and harnesses and what to buy to swap a 6.0 in easier would be much appericiated

Re: calling LS swaped guys
 

IMO if this is going to be a work truck and not one that is sitting in the parking lot with its hood up all the time then I would get the stock truck fuse/relay underhood 'box' and then hook up the power 12v, ignition signal, starter, and ground, might be 1 or 2 others and fire it up and roll out. that is the easiest.

Re: calling LS swaped guys
 

ok correct me if im wrong but, does the computer harness run into the underhood fuse box and then run to the engine for all the sensors and stuff and the computer is stored close to the fuse box.

how hard is it to get the wiring harness to fit on a engine with the fuse box under the hood. dont you have to delete some sensors from the harness like o2 sensors and some other things

Re: calling LS swaped guys
 

that's right and the tuner can turn off all the un-needed sensors. I still have my whole harness in tact just removed the codes from the PCM.

Re: calling LS swaped guys
 

ok cool, which sensors did you have the tuner turn off or do what the tuner guy does to make it run without them, and does the pcm throw codes when you swap a ls into a old truck if you have it tuned right, and what do you do with the check engine light, like where does it go and how do have one if you dont have the same gauge cluster. is it just a circuit the computer turns on when something doesnt work and it lights up the check engine light

Re: calling LS swaped guys
 

Tuner will turn the codes off in the PCM so they dont show up on a scanner. I have turned off all emissions equipment, rear O2s, MAF (b/c I am speed density), VATS, and I think that is about it. You dont have to turn all that off just to fire up, just need VATS turned off.
I am using all my stock gauges. I use the Cable X ($300 shipped from me) for the stock speedo. that box is run off the VSS coming out of the PCM. I have added a oil pressure gauge-where the factory oil pressure sending unit was, got the adaptor from Autometer and the tempature gauge is in the header hoses.
as for the check engine light, I do not have one but it is in the bundle of wires on the harness, you just wire it up and have a ground i would guess.....but since I have not done it I dont know.

Re: calling LS swaped guys
 

"I use the Cable X ($300 shipped from me) for the stock speedo. that box is run off the VSS coming out of the PCM."

uhhhh whats this lol, you have to have input from the speed sensor to the computer, i havent heard of this befor, can you explain it to me

Re: calling LS swaped guys
 

Well, what trans will you be using? If its an electronic trans (4l60e or 4l80e) the trans is controlled by the PCM, ie its shift points and pressure. And the PCM is fed information from the trans based on sensors and tells it mainly the speed, that is what controls alot of the trans tables, at WOT there is a RPM driver too. but for low speed the PCM controls the shift points. this is no big deal as long as you have the correct harness and 12v to the E pin at the big plug on the trans.

But then you want to know how fast you are going right!? Well, you can run an electronic speedo that will be run off the Vehicle Speed Sensor (VSS) or you can take that signal to the 'box' that turns a motor that turns a mechanical speedo (ie the stock one in my case).

IF you are running a TH350 or TH400 or other non electronic controlled auto then you do not need to worry if you are using a mechanical speedo, you just run the cable(stock) to the speedo as normal.

Re: calling LS swaped guys
 

ok thank, yea i plan on running a sm465 4 speed, i guess i wont have to worry about that then. Im going to run a throttle cable instead of a electronic throttle is there anything that i should watch out for when i get a computer for my truck. i think i have read something like one computer is meant to run elctronic throttle and ones not. Is this true

Re: calling LS swaped guys
 

If you going to run a cable style TB then it is EASIER to get a motor that has a cable style on it, otherwise there are several other things that have to be done...it gets more complicated but if you get one with the electronic TB on it then get the gas pedal and TAC module from donor, that is alot easier!

Re: calling LS swaped guys
 

ok thats great man, first ls swap im tryin to make it the easiest as possible haha, plus i just want the basic stuff you know. where would be a good place to get a computer tuned, if you know anyone or any place that does it

Re: calling LS swaped guys
 

I do it....
www.herronperformance.com

Re: calling LS swaped guys
 

haha cool what a coincidence lol, so i clicked on the tuning part on your site and it said like 200 or so for a tune, is that for just the tune or the whole computer thats already tuned.

cool website by the way

Re: calling LS swaped guys
 

U will need to send me a PCM to tune OR I can source one I HOPE and charge you for it.
And for the stuff you have described here, ie STOCK motor I will do it for $165 shipped back to ya.
It would be best thought to get the motor/harness/PCM together that way there is less issues....from what we have found.

Re: calling LS swaped guys
 

ok cool man, ill give you a call when i get my motor and stuff, if i cant get a pcm and harness with the engine is there any specific pcm or harness i should look for, like out of any truck with a 6.0l would work wouldnt it

Re: calling LS swaped guys
 

ok i figured you would know this if anybody would, "active torque management" is this a engine thing or a trans thing, ive heard of some how disabling this and then there motors having unbelivable torque everytime they shift gears is this true or i dont know what im talking about.

Re: calling LS swaped guys
 

Just make sure if you get a motor with Electric TB get the Gas pedal andTAC module from the same vehicle, it makes it much easier!!
I woudl also look for a 6.0 out of an express van 2500/3500, they have the LQ4s, that is where mine came from.
05+ have the Drive by wire TB or electronic TBs.

Torq Management is both engine and trans side and YES removing this really wakes them up plus timing at WOT is very low.

Re: calling LS swaped guys
 

do the express vans just make good donor motors or do they have alittle extra power behind them, i really dont want the electric TB so i prolly wont buy a motor thats like that unless its got a good price on it. can you remove the torque management when you tune a computer or is it something that is gone when you diconnect the trans control module.

Re: calling LS swaped guys
 

TM is in the PCM.
Express Vans 2500/3500s have the same LQ4s and the trucks.
they have some extra sensor plugs on the harness that you dont use but its all the same, and their harness is longer....
I am not sure when they put the ETC style TBs on the vans so that might open up some options.

Re: calling LS swaped guys
 

ok cool thanks man, im sure at some point ill have more questions for ya

Re: calling LS swaped guys
 

Doesn't the engine need a signal from a VSS to run at its highest potential??? I know it doesn't HAVE to have it, but I thought it was much better if you did. The engine needs to know what speed its going (not just RPMs) to tune itself properly. I have read this on a couple different sites, here is a quick link that keeps it pretty brief. Read the first paragraph. If I'm incorrect on this then by all means let me know, I'm in the middle of the same swap!

http://www.jagsthatrun.com/Pages/Spe...integralsleeve

Re: calling LS swaped guys
 

I have several machines running without the VSS hooked up to anything.
there are not any tables (ie fuel or spark) that are controlled by the VSS when you do not have an electronic transmission. IF you do have an electronic trans then yes, it has to have the VSS.

As I read that first paragraph I have undelined the main reason it is there...ie the parts they have referenced is to run mechanical speedos:
PASSENGER CAR VEHICLE SPEED SENSORS

On the far right above is a 4-pulse integral VSS/speedometer sleeve. This VSS has provisions for using a standard speedometer cable and was used on 1990-1992 Police cars which had cable driven radar units. The unit is no longer available from Chevrolet, but Stealth Conversions has a large inventory of the remaining units. This will work for a 1990-1992 TPI (or 1990-1992 Camaro V6) and 1992-1993 LT1 engine with a 700-R4 transmission or ZF six-speed into a vehicle which requires a mechanical speedometer. This unit comes in two styles: one for 34-39 tooth driven gears, and one for 40-45 tooth driven gears. They use the same speedometer gears as the Corvettes and Camaros. This unit will also trigger the 4-output vehicle speed buffer shown on page 12-2 of the VSS chapter. This unit is made of plastic, and will not support an angle drive unit.

Re: calling LS swaped guys
 

But it is required if you want to have a functional cruise control, correct? Even if you have an old style manual tranny.

Re: calling LS swaped guys
 

Cruise control...who wants that, LOL

Re: calling LS swaped guys
 

Shon
I want to run a 700r4 with a 6.0 lq4 in my 72 chev swb fleet, i have gathered all the autometer gauges i need except for the speedometer...i was told that i need a programmable speedometer. is that true? or do i need a electric one instead?
thanks

Re: calling LS swaped guys
 

what does your trans put out, I assume its a mechanical output, then you decide do you want to run a mechanical gauge or an electronic one.
Once you get that figured out you have options.

Re: calling LS swaped guys
 

ok so all this speed sensor deal, if your trans doesnt need to see a signal from the computer its fine to run without a speed sensor. but im just thinking here but wouldnt the engine need to see what gear or what the truck is doing to adjust for running conditions like droping in overdrive and just cruising or is the motor just goin to run fine without it. idk im just thinking out loud

Re: calling LS swaped guys
 

o and i got a question about a ls intake. im wanting to run a ls stlye intake on a lq4/9 when i get it in my truck just for alittle cool factor so i can run a corvette engine cover. can i get away with runnning a ls tune on a lq4 with a truck intake until i can buy a ls intake.

Re: calling LS swaped guys
 

Motor doesnt care.
the tables are set up to know the amt of air coming in and from there it has preset timing and fueling.

LS1/6/2/7 intake swap is more indepth than just putting it on there.
it would be best to do a search on performancetrucks.net than for me to type it all out....

Re: calling LS swaped guys
 

I don't claim to know a tenth as much as other people on here when it comes to automotive computer programing, but I can regurgitate what I have read elsewhere. Some people claim that the engine needs a VSS to avoid stalling during coasting....here are some links.

post #5

post #17

VSS section towards the bottom of the page

Not trying to offend anyone, just trying to help...

Re: calling LS swaped guys
 

not a problem....and this can be debated but I know how we have done alot of them and one area that demands throttle response is in the off road jeeping...I have several on trails with NO VSS and they use 4spd FORD Manual trans to TH350 or TH400s and all enjoy the tune.

This one had 'old man truck cam' with Th400
http://www.herronperformance.com/ass...Clay_crawl.jpg

and this one has Ford M4 behind it
http://www.herronperformance.com/ass...oab_09_223.jpg

Post #5 & #17 referenced above: that is solved with the right IAC positions.

LT1swap quote:" VSS - The PCM needs to know if vehicle is moving. Without the speed sensor, you can suffer from reduced fuel economy, reduced power, and idle problems. There are a few options for speed sensors on the transmissions with cable drive output. "
Not sure how this will cause reduced economy or power, there is NO table that references transmission tables. and again, idle problems are solved with correct IAC and idle RPM.

and I do not have to idle them up to 1k, most are less than 800 RPMS...

Re: calling LS swaped guys
 

hey shon i got a wiring question for you. i have a 1979 k10 bonanza that im putting a lq4 in and i dont really want to put the whole fuse box and stuff the trucks with the 6.0 have. i just want the simplest wiring under the hood in case of some electrical problems or trail stuff im sure you know what i mean. i have seen guys that are running just like 6 fuses and a relay and they dont use the whole fuse block. can you give me a little info or insight on what they are wiring. i dont fear doing the wiring on my own so thats not a issue. i just dont know what wires and stuff it is.

Re: calling LS swaped guys
 

honestly, the easiest and simplest is to use the whole box the truck uses. that way if it dies you can get another one quickly, example brother lives here in SC, tows toys out to MOAB, jeep wont start, finds out its the relay/fuse panel, has one overnighted from buddies in junk yard here in SC, he is back on the trail!!! (the pictures above are from MOAB, his is the first one posted)

I use Current Performance DIY Fuse/relay, its alot more wiring than the stock stuff but its less 'stuff', keep in mind, this is not a show truck
http://www.herronperformance.com/ass.../Fuseblock.jpg