1991 gmc jimmy 2 door v6 4.3L twin turbo help!
 

hey there!

i came across this kick ass site.. sorry if someone posted a topic like this before... but i searched high and low all over the forum before i posted this.

i have a 1991 gmc jimmy 2 door, v6 4.3l, that i plan on converting into a sedan delivery rodster kit car.
i plan on having suicide doors, fully shaved body, shaved tail gate, custom old 40's style front and rear bumpers. 33.0x21.5-15LT mickey thompson sportsman rear tires, and front runner tires for the front.

i plan on making on sick ride, just for cruising

if youve checked out the sedan delivery at rodster.com youll notice there ALOT more room inside the engine bay than a stock s10, the entire nose tilts forward giving you plenty of room to the engine

http://www.rodster.com/assets/owners/WeidnerSED231.jpg

that picture shows you how much room is freed up!

i have already purchased the twin turbos, and the turbo exhaust manifolds

the two turbos are made by mitsubishi and they are made for a v6 4.3liter gm engine, they are watercooled!

the turbos came off of a 4.3liter v6 that was used for HVAC purposes, so it was indoor, and run at constant rpm, so im guessing there is no shaftplay!

the original set up isnt intercooled, becuase its an indoor setup, but i plan on having a twin intercooler setup, unless someone thinks a single inter cooler is better?

i wanted to mount both turbos as far away from the engine as possible, and possibly fabricate 2 small side hood scoops to bring in fresh air for the turbo intake. and a long slender hoodvent that will run across the hood near the windshield to give it a wiper cowl effect, and it will be fully functional

i went out and bought braided oil lines, and a bunch of polished aluminum piping for the intercooler and turbo set up

ive bought a return nipple for the oil pan, and ive bought an extra water pump and an extra oil pump to get the fluids flowing more easilly, are the extra oil and water pumps nesesary? or should i just upgrade my stock ones to high output pumps?

later on when i have the money, i plan on supercharging it, but thats a whole other idea, imagine that, a twin turbo supercharged v6 4.3liter s10 running on 33.0x21.5-15LT rear tires! i plan on getting fender exhaust so you can hear this thing coming a mile away!

please excuse my stupid questions, but where does the pipe exiting the intercooler connect to? do i need a speacial intake manifold? shold i get a bored and smoothed throttle body?

and now for the answer to the question that i see alot of people who inqure about turboing there s10's are asked...

why not just drop in a v8?

well, becuase, here we go, ready for it? my gmc jimmy has 2500 ORIGINAL MILES ;D never been driver garaged all its life!

this baby hasnt even had its first oil change!

im going to make sure it only gets synthetic oil the rest of its life! im guessing synthetic oil would be alot easier on the turbos too

and why an s10? well, i like the rodster sedan delivery alot! and the whole idea of a 33.0x21.5-15LT rear tire on a cruiser, and the sound of flowmasters is what i like,

im very tired right now :)
so i hope i didnt leave anything out, and also, please excuse any spelling or grammer errors, and i apoligize in advanced, some people are very ---- about grammer and spelling

i will be getting a camera within a month
so i will have pictures of everything up for you guys to see
thanks
mkj

Re: 1991 gmc jimmy 2 door v6 4.3L twin turbo help!
 

You don't need to upgrade your oil or water pump. Couldn't hurt though.

The pipe exiting your intercooler connects to your intake manifold, throttle body, carb, whatever you have.

Good luck, seems like an interesting project.

Re: 1991 gmc jimmy 2 door v6 4.3L twin turbo help!
 

Sounds like a solid plan.Def take lots of pictures and keep us updated.There is some good DIY engine management systems using the factory GM ecu.I had some good links to a couple sites with forums dedicated to those systems I can dig up if you need.

Re: 1991 gmc jimmy 2 door v6 4.3L twin turbo help!
 

hey jagojon3, can you show me how the pipe exiting the intercooler connects to the intake manifold, throttlebody, carb, or whatever i have ;D
my engine is the 4.3L V6 OHV 12V FI Engine, with the circular air intake thingy, would i connect the pipe leaving the intercooler to the pipe connecting to the circulat air thingy? do i connect it at the red line as shown in this picture? (i got the picture off the internet)
http://img436.imageshack.us/img436/4741/ed123ny.jpg
sorry im stomped :'( thanks for the good luck :)

hey there 90dx! i definatly thought this whole thing out out, i just got to work out the few small things that are left, i will have a camera in less than a month, and will have pictures of the car and all the stuff i bought. i read on another post that if you reuse all the factory sensors and put them in the right place that you dont have to worry about touching the ecu :-\ is this true? it would be awesome if you could dig up those links for me, i would be eternally grateful ;D :y

Re: 1991 gmc jimmy 2 door v6 4.3L twin turbo help!
 

i havent gotten as many replies as i thought i would ??? i didnt think this forum was dead :X
i wished some moderators would reply :P

i edited my first post, and removed the website for the kit car, maybe people thought i was plugging the website? :-\

anyways, i bought all my braided oil lines today, and i tapped the oil pan for the return, and i was ---- scared when i did it, but i need to know, where do i pull the oil lines from? do i pull one line and have a splitter to each turbo? or do i pull two seprate lines? also for the oil return, do i have two seprate oil returns? or am i good with just connecting the two returns into one line, and connecting it to the tap i just made today.

i need to know what size and kind of water lines to use, my twin turbos are also watercooled, where the hell do i pull the water from?
i figured ill need an aftermarket radiator with premade taps, have my feed line from taps at the bottom of the radiator, and return line to taps ontop of the radiator,

i got myself into a shithole here, and i hope it doesnt turn into a money pit

thanks
mkj

Re: 1991 gmc jimmy 2 door v6 4.3L twin turbo help!
 

it should be easy enough to take this picture of my engine and see where the air from the turbine needs to go.

air --> turbo inlet --> *compressed* out of compressor --> *compressed* through pipes into intercooler --> *compressed* through pipes into throttle body/carb

you need to remove the oil pressure get a fiting with two ports, put the sender in one, and a fitting in the other connected with a hose to the turbo(s) for oil. after wards the oil should drain out of the turbo through a hose into the pan

to get water for the turbos you need to take a water hose on the engine, cut the hose. T it off to the turbos, then after its gone through the turbos connect it back to where it was going. it shold have nothing to do with the radiator or rad hoses.

https://www.homemadeturbo.com/jbliss...mustang113.jpg

Re: 1991 gmc jimmy 2 door v6 4.3L twin turbo help!
 

thanks alot random-strike ;D
what do u think of a twin intercooler setup?
other than the oil pump, and water pump - which i plan on upgrading -and the other stuff associated with the turbo like the exhaust manifold, air box and such, would i be ok leaving everything else stock? like the ecu?
also, have i missed anything? i feel like im forgetting something :7
thanks for the quick reply, i hope i didnt come off as an ass in my last post :)

Re: 1991 gmc jimmy 2 door v6 4.3L twin turbo help!
 

i think you got a lot to learn, the air box will not be used since the turbo inlets are now the air intake places, unless you want to run some goofy tubes to your air box from each turbo. i would just put a little air filter on both the turbine air inlets.

twin intercooler setup? cheaper than buying a dual in single out fmic. but a PITA to fit i there. lots of pipes... stuff like that.

you might be able to leave the ecu stock if you use some other kind of way to get extra gas into the engine. i would search the interweb for 4.3l builds and see what they used. FMU, megasuirt all those extra injector controller crap. maybe someone can do something to your ecu to change the fuel in it.

Re: 1991 gmc jimmy 2 door v6 4.3L twin turbo help!
 

oh, the awesomeness

thanks a shitload random-strike

yeah, the first thing i realized is that i would need to get rid of the stock air box, and i was gonna install two cone air filters at the turbo inlets as far away from the engine as possible

so from what i understand, if i get higher lb/hr rated fuel injectors i would need to change my ecu, which is something i dont want to do.

or if i plug in all the proper sensors, in there proper places after the twin turbo install, and i install an upgraded fuel pump, would i be ok?

i like the awesomeness of a megasquirt, seems like i would go for one of those, and im pretty damn tech savvy enough to figure it out, and i love having things that look over complicated ;D

but the FMU looks like the simplest soulution, but it only has one purpose... unlike the megasquirt. which i can use to control alot more stuff

so i think megasquirt it is, unless plugging in all the proper sensors, and upgrading the fuel pump would work

engine space really isnt an issue at all, check out what the engine bay will look like with a kit... this isnt the stock engine.. its a 350 i think... but u get the point

http://img418.imageshack.us/img418/9...yofroom9vv.jpg


as far as intercooler, and turbo piping, is bigger piping ok? i was thinking it would look cool with 3" piping >:D and i figure it would increase function

im guessing im going to go for a twin intercooler setup since space isnt really a restriction for me, ill have two long intercoolers where the fenders are supposed to be on the car... and ill install side hood scoops like i mentioned earlier to get better air flowing through the engine.

i searched the (inter) web high and low an could find anything on any 4.3l builds ::)

thanks for this awesome website ;D and all ur awesome advice :y

Re: 1991 gmc jimmy 2 door v6 4.3L twin turbo help!
 

no bigger piping is not really good. esp if you want 3" piping from each turbo. thats a little much. maybe 2" from each turbo would be good

you HAVE to have some extra gas into the engine some how. just running ti stock will not work.