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So, i was thinking today, i have an 89 Grand Marquis 5.0L V8 302, and wanted to turbo it, but i had a few questions.


- What will the computer allow as far as boost pressure? Will it adjust fuel and spark automattically? How much boost will it allow?


- How much boost will the stock bottom end take?





Those are the main ones for now, if anyone could help, I would really appritiate it. Thanks!!!
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Well, I'm not an expert in this field but I can tell you that the computer will not compensate for any added boost from a turbo. I think reprogramming or replacement of the computer will be needed. I'm pretty sure a high volumn fuel pump will be needed. That could mean changes to the whole fuel line system(higher pressure fuel line), fuel rails, and injectors. The recirculation of exhaust that is then forced into the intake of the engine, I would be more concerned about the stock top end of the engine not the bottom. I think if you purchase a turbo kit for your make and model that it will give all the rest of the info you require to make the most of the kit you can. Good luck and let me know.

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Alright, well, this car has a MAP sensor right? If it does, i can just put a T fitting on the vacume line inline to the MAP sensor, which will bleed the boost off, so the MAP doesnt read boost, and the ECM doesnt see anything as far as boost. Stock fuel system should be ok, im only running 6PSI to start with. I think i could just use an adjustable fuel pressure regulator and it would be fine, just up the pressure a bit. Would spark need adjusted for only 6PSI?? Also, how much boost can this engine stand up to? Thanks again!!
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i would start off by upgrading the engine. i would install an explorer or HO cam, upgrade injectors, change the computer out with a HO computer out of a lincoln Mark7, chnage out the heads since valves will float at higher rpm, changing the upper plenum/intake and upgrade the exhaust system.

changing the cam will allow to be ran with HO spark plug wiring firing order and save the bottom end of the engine since standard 5.0 firing order tears up the main bearings on one of the cylinders... cant remember right off hand.

changing out the heads will allow i to breathe better and help with valve floating. nice heads i know oof hand are produced by a guy in Florida called thumper of orange county IIRC.

i would go to a HO upper intake, EGR spacer, and throttlebody. the throttle body would have to have the butterfly arm replaced with your standard arm since an HO upper is backwards compared to our cars. or you can get a Typhoon upper intake since i have a current project in the making i plan on using a typhoon for.

exhaust system should also be upgraded. i am getting BBK shorty headers, connected to a BBK offroad X pipe and dump out the exhaust in front of rear wheels to avoid the bad restriction of the bend over the rear axle.

about best bang for the buck is to get different rear gears in the car to be upgraded to 3.55 or 3.73s. another thing would be a underdrive pulley made for our cars. it is made by ASP. it is just a crank pulley and helps alot.

if you wanna save on a build, find an 1997 explorer or 1997 mountaineer engine and do a swap and switch your accessory brackets over to keep everything in same place instead of customizing all hoses and wiring. dont know if this will help much, but figured if you are doing a build, this might do some good.

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Alright, thanks.


I wasent really wanting to tear the engine down, I was just wanting 6PSI of boost on this engine.. exhaust right now has a flowmaster 40 series, with the exhuast run out the passenger side... Where do you get those BBK headers from, and what are they made out of?? It might be easier to weld a turbo flange on them than the stock mani since stock is cast... Would this motor with all stock internals and everything take 6PSI? I think it should, as 6PSI is a VERY low ammount. I know a friend that has a stock 4 cylinder sunbird running 22PSI, so i wouldnt imagine it would be hard, but want to make sure. What are some easy bolt on mods for these motors? what do they respond to best?? Thanks again!!!
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best mod is rear gears. upgrade that and you will notice big change. if you swap to shorty headers and also the upper intake to allow better breathing it would be more beneficial to swap the heads. to get another boost would also be to convert the engine to HO. you can find the headers on ebay...

http://cgi.ebay.com/ebaymotors/79-19...OME-SHORTY-HEA DERS-FORD-MUSTANG-5-0-1515_W0QQcmdZViewItemQQcategoryZ33631Q QihZ022QQitemZ350026178242QQrdZ1QQsspagenameZWDVW


i still sugest to swap the rear gears out and you will see major improvement over what you probably have. to know the gears you have now, look at your door sticker and tell me what it says under AX.

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Alright, I just checked, and under AX it says 8. Also, the heater core went out, how hard is it to change that? Also, how hard is it to convert to a 5 speed, for some added fun [img]smileys/smiley1.gif[/img]lol. What cam, intake plenum, heads, ect. would you recommend for this engine if I still boost it?? Thanks. And oh yeah. i'll check out that site you sent me, thanks again!!! Your a big help!!!!
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lets see....

you have a 2.73 open rear gear setup. in other words, it is slow on take off and would really benefit from an upgrade. heater core is a pain in the butt. you need to pull the whole dash loose to have access at the heater core compartment.

i would go with a HO cam from an explorer/mountaineer, or from a mustang with a HO. intake would benefit from going with a HO plenum from vehicles mentioned above or a typhoon intake set. heads i would go with a set from Thumper of Orange Park. by changing the cam, it will change firing order of the car to a HO setup. if you check the site i sent, it will have tons of advice on how to get best bang for the buck.

i forgot to mention... here is a link to my photobucket... it has pictures of an HO install in a Grand Marquis i helped with when i was on vacation in Pennsylvania. this way i can show i helped with a modified Grand Marquis and what kind of work i know how to do to these cars.

http://s48.photobucket.com/albums/f2...achickenfarmer /Crown%20Vic/SF07/

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Alright. How easy is all this stuff to put on?? Just basic bolt on stuff?? What gears would you recomend? Where can I get them? Also, what does HO stand for??? Sorry, i'm new to these cars. But, thanks again!!
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i would recommend stepping the gears up to 3.27 or 3.55s. they will give you a much better jump compared to the gearing setup meant more for highway. the intake stuff is bolt on setup. HO stands for High Output like what mustangs have in them. our cars are tuned down due to the crank. where are you located and i can see if anybody i know is close to you that may be able to help you out.

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Not hard just time consuming. It's pretty straight forward. I'll post my write up on removal of the heater core.

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Heres what you got to do.

Mark all bolts that you take off, give a discription of where they went.

Mark all wiring connections that you may disconnect as well.


UNDER HOOD:
Disconnect the negative battery terminal.

Drain coolant until level is lower than the heater core hoses.

Disconnect heater core hoses. Mark where which one went.

INTERIOR:
Remove the dashpad.

Remove trim around the dash.

Remove kick Panels.
Disconnect Shift Indicator from steering column.
(remove cover behind steering wheel, unbolt the white ring. it may be broken, it might not be. Carfully remove wire from black clip on the shifter.)

(I removed the entire instrument cluster. My speedo cable didn't let the dash come out as far as it could.)

Remove trim panel below steering column (where the fuse box is)

Drop Steering Column
(Find the four bolts on the column bolted to the brace. Socket size 15mm) Before you drop the column, put emergency brake on and chock the wheels!!!!!!!!!!!!
Unbolt bottom of heater core box, two bolts down by the floor. (remove cover if any)

Unbolt the dash support at both sides of the dash.

Unbolt the dash support nut that is located where the steering column usually is.

Unscrew or unbolt the bolts at the top of the dash by the windshield. only the ones right by the dash.

Pull the dash forward and down.

Remove the insulation below the windshield to expose a nut behind it. Unbolt it.

Pull the box with the heater core out towards you and pull it down. Clear the holes in the firewall. Long ass heater pipes.

Unbolt the cover on the top of the box. 4 bolts.
Remove cover

Pull out old heater core. It'll be a little hard to get out but play around with it a bit and it will come out.

Save the rubber thing that's wrapped around the core.

Get your new core.

Clean out the box where the heater core was out with windex after you wipe all the antifreeze in there with a rag or paper towel.

Wrap the rubber thing around the new core.

Put the core back in the box.

Bolt the cover of box back on.

Line up box on the studs.

Bolt box up.

(Check to make sure that there are no connections disconnected [vacuum hoses, wires wiring harnesses etc.])

Get dash into position. (You'll have to get it over the air plenum)

Start a screw on each side of the dash.

Bolt dash into place.

Bolt all dash supports back up.

Connect any disconnected harnesses that you disconnected.

Bolt steering column back up.

Reattach shift indicator cable.

put kick panels and all covers you removed, back on.

put dash pad back on.

Put everything back on that you disconnected
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I am located in washington court house, ohio...





Thanks for the heater core thing too, i started tearing down tonight...


Thanks again to all!!!!
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i was asking location because there are guys tht can help with the HO upgrade or if you wanna go to a guy that does the work and specializes in it. the guy that does all the work you could need is located in the Tremont, Pennsylvania area.

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Well, I read up on some thing on the other site, I dont think it would be too hard, im not so good at engine work, but one of my friends had a pontiac sunbird and he built the engine himself, its a 2.0L 4 cylinder pushing 38 pounds of boost and a 250 shot of nos, methanol injection and all sorts of crazy stuff... puts out 500+HP at the wheels now that i saw the latest dyno sheet... he said he would do it for me, i just have to get the parts now... thats where lies the problem.. money, and where to get the parts... anyone have some for sale? if so, prcies please.... thanks again!!!!
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Parts for an H.O swap?
Junkyard is your best bet. Look for 5.0 mustangs, capris, or certain Mark VIIs. These will have H.O motors. You will want to find a car from 1986-1991. IIRC in 1992 the cars went to mass air flow.
Anyway, these cars should have what you need; An H.O Computer, you'll need that to compliment the H.O cam in the car. Take the upper intake as well. I don't have much info on the H.O swap cause I've never tried to do one. There's probably a crapload of stuff that I forgot. 87_Crown_Vic will fill in the gaps that I've missed since he intends to do an H.O swap on his Tudor later in the year.