[Geno Castellano]

cool. that's what i have the 4.9 liter for :devil: . i'll just use the 4.5 TBI for the daily driver it was 3 years ago. guess what? i have an 86' deville that needs rebuilding too!

one more question though, how will the 4.9 MAP work out?

It will not comprehend boost either..... None of those systems were set up for 2 atmosphere MAP sensors like the factory turbo systems use (such as the Buick).

You will have to rely on overboosting the fuel pressure to compensate for the boost or something like that.

 

[illumina]

It will not comprehend boost either..... None of those systems were set up for 2 atmosphere MAP sensors like the factory turbo systems use (such as the Buick).

You will have to rely on overboosting the fuel pressure to compensate for the boost or something like that.

sounds like that MSD pump booster and a regulator will be the way to go then.

 

[illumina]

ok...so bbob set us strait on the oiling/cooling that will be needed. i feel that the MSD pump boosting and a regulator will be required. the MSD boost controller is good too. getting into the map sensor will not be needed from what i have interpereted by bbob.

mounting is next. the deville cross-over system is a good start. i will see if my seville can accomidate the same setup. insulation is a must. we don't need a turbo scarring our cadillac hoods from high heat. another thing of interest is an intercooler. got plans for that too.

 

[DeVillish]

I hate you ALL! LOL nah i dont, but i have to leave my Coupe here for 2 years while i go to japan. I've been thinking of going the turbo route for some time now. If one of you have a turbo deville before i get back i'll have to look into twin turbo! I bet i could get some nice turbos and gear from japan for cheap too. hmmm. Make sure you guys check out domestic performance, they even have LSDs for our tranies. Anyone thought about just getting on the bottle?

 

[N0DIH]

I hate you ALL! LOL nah i dont, but i have to leave my Coupe here for 2 years while i go to japan. I've been thinking of going the turbo route for some time now. If one of you have a turbo deville before i get back i'll have to look into twin turbo! I bet i could get some nice turbos and gear from japan for cheap too. hmmm. Make sure you guys check out domestic performance, they even have LSDs for our tranies. Anyone thought about just getting on the bottle?

The Bottle? That's not REAL hp! That's cheating!! But then again, turbos and the bottle work SOOOO well together. Think of it as a intercooler in a bottle!!

Snag a couple Suburbu WRX or Mitsubishi Evo turbos while you are there.

I am considering a twin turbo setup, but I don't think the 4.9L will handle it without coming out and major mods (10's in a Caddy? Looking into a parallel twin turbo that allows for staggering of the turbo to minimuize turbo lag and increase response (like the 4.9L needs that, eh?).

My thoughts are connect the two turbos in parallel, then insert a exhaust block valve like a decelerator valve for a diesel in series with 1 of the 2 turbo's. Keep that valve closed until you at at boost with the 1 turbo, and then open the valve and you get the additional airflow of the second turbo. They need to be the same size else the higher pressure from the other turbo will slow the other turbo down.

Ideally it would be cool to use the ECM to control the secondary turbo valve. Like an unused output on the ECM like the AIR diverter valve or something. Even though our PCM doesn't have it, the I/O may still be there.

Tom

 

[Stoneage_Caddy]

do youself a favor when your over there devillish

FORGET THE CADDY !!!!!

go get you a cheap skyline or a old pulsar GTI-R , and enjoy the ride ........oh and pick up some japanese cuties !!!!

Whats nice about being staioned overseas is you get to sample the "other" car cultures

 

[FLSurf420]

im down to do it, just tell me the plan and how much its gonna cost

 

[2dfx]

omg...Turbocharged 4.9...Flowmaster 80's.... :worship: :worship: :worship: :worship: :worship:

If I may, what are the expected HP gains through this project, based on knowledge of other stock vs Turbocharged engines?

 

[illumina]

omg...Turbocharged 4.9...Flowmaster 80's.... :worship: :worship: :worship: :worship: :worship:

If I may, what are the expected HP gains through this project, based on knowledge of other stock vs Turbocharged engines?

horse power is not what we should be concerned about, torque is. a turbo would add plenty: it all depends on the setup we use. i plan a small, faster spooling turbo that will add about 8 lbs. of boost. all told, i would expect about 80 lb. ft. of torque through a broader band in the rpm range. the HP is a measure of that afterwards.

also, i plan on adding some NA ass to the car. i would like to sqeeze 300 HP, 340 lb. ft. of torque before i add the turbo. this will be done through valve/head work, higher lift cam (keeping duration if i can), balanced engine, all that shit plus what i have on the car already. i therefore think 300/340 is doable before the turbo. with the pushrod design and the low-pro cam, a turbo will add a tremendous amount of torque to the top end where the 4.9 needs it.

all told, i think this setup will get the car in the mid-high 13 second range.

 

[kcnewell]

horse power is not what we should be concerned about, torque is. a turbo would add plenty: it all depends on the setup we use. i plan a small, faster spooling turbo that will add about 8 lbs. of boost. all told, i would expect about 80 lb. ft. of torque through a broader band in the rpm range. the HP is a measure of that afterwards.

also, i plan on adding some NA ass to the car. i would like to sqeeze 300 HP, 340 lb. ft. of torque before i add the turbo. this will be done through valve/head work, higher lift cam (keeping duration if i can), balanced engine, all that shit plus what i have on the car already. i therefore think 300/340 is doable before the turbo. with the pushrod design and the low-pro cam, a turbo will add a tremendous amount of torque to the top end where the 4.9 needs it.

all told, i think this setup will get the car in the mid-high 13 second range.

For what all that is going to cost....just buy a used Z06 Corvette and run 12's much easier and cheaper....

 

[illumina]

For what all that is going to cost....just buy a used Z06 Corvette and run 12's much easier and cheaper....LOL

c'mon bbob, what would the fun in that be? although i have considered a nice trans-am ws6 as of late :devil: i should state that i LOVE a good challenge. that is why i have done some little mods to the current 4.9 too, i like having a sleeper (exhaust is a tad loud though). and nothing would get me going more than having the 91' blow the doors off of a nice unsuspecting musclecar...and doing it in luxury...just need to consider quieting my exhaust some.

 

[DeVillish]

see, the problem with being in japan, I cant own a car! Iam not an NCO, yet. And even if i could get one my last year there, having it shipped isnt cheap. I plain on getting a new car when i get back anyway, might not be a caddy though. I'll have to see what caddy has to offer in 2 years. maybe a used CTS-V.

 

[2-tone]

http://www.fiero.nl/forum/Forum1/HTML/023354.html has already been done. Just in a smaller package.

 

[illumina]

never seen that one before. seems cool.

i have a very similar plan in mind for my soon-to-be setup. i already have the deville manifolds (from the 4.5 i plucked from the junk yard), the cross-over from the engine, and a turbo.

thing is, i feel the turbo is way too small for what i am hoping to accomplish. and from what i have gathered, the turbo i have seems to have some problems in the form of small wastegates and such.

i plan 8 psi of boost, but i will start off low and work my way up (4 psi?). the MSD boost controller was in my plans all along. i would like to get some chip burning stuff, but im not too sure where i can get one of those setups. otherwise, i will be pumping money in the form of fuel pump boosters, timing controllers and such.

i like the location of these folks' turbo's. i seen the same thing on tyre's website. i have also began planning the internal engine setup i want to use. the tranny will be mucho fun too...

now things will be getting interesting from here on out...i need help! :cookoo:

 

[HippieD9]

Just my 2cents... I don't think you'd want to run more than 5psi or so with stock internals and NO knock sensor. I'd say go easy on that poor engine. Let me know how it's going, I've been thinking of doing the same thing for a while but I've never worked with turbos before.

Peace,
D.

 

[illumina]

Just my 2cents... I don't think you'd want to run more than 5psi or so with stock internals and NO knock sensor. I'd say go easy on that poor engine. Let me know how it's going, I've been thinking of doing the same thing for a while but I've never worked with turbos before.

Peace,
D.

from the fiero link in this thread, i would agree that 5 psi may work wonders for the engine. the rebuild i plan on doing is by no means going to be stock. therefore, the engine will work fine under moderate boost.

jegs offers a knock sensor setup that can be put into one of the access holes in the engine.

BTW poor engine??? you should see the 4.5 liter i am rebuilding with 201k on the clock: pristine. i think she can handle it.

 

[N0DIH]

How about some good reading!

http://www.turbomustangs.com/turbotech/main.htm

Ok, it is for a Ford 302, CID is about the same, Bore and Stroke are diff, but 98% of this applies....

Now, for the $$.........

Tom

 

[illumina]

How about some good reading!

http://www.turbomustangs.com/turbotech/main.htm

Ok, it is for a Ford 302, CID is about the same, Bore and Stroke are diff, but 98% of this applies....

Now, for the $$.........

Tom

good info bro. thanks.

once i get my 4.5 liter done (picking up crank from shop friday), and finish my 86' deville, i am going to start on my new 4.9 motor. this new motor will be set up for the turbo/forced induction system.

 

[89eldorado]

Hows the 4.9L turbo buildup going? Im thinking of starting to gather the parts as well... Probably wont do it for another 6 months or so...

Have you looked into the megasquirt piggyback/standalone ecu ??? www.megasquirt.info seems like the cheapest and easiest fuel solution...

I like the idea of two turbos (But probably still low boost)... seems like it would have better effieciency, then wrapping the exhaust around to where the airbox would be for a single turbo...

Regards,
Brian

 

[ralcantar009v7]

Ok, how about toss some thoughts out there on possibilities of turbocharging the 4.9L. 1. Need the lower compression to around 7.5 to 8:1 to allow for acceptable boost (10 psi or more depending how well the PCM can manage it) 2. Need a MAP sensor that can read boost as well as vacuum. Sensor from 1.8/2.0L Pontiac turbo 4 cyl can do boost and vacuum up to 2 bar (15 psi) 3. Reprogram fuel maps that will supply additional fuel for turbo. 4. Replace injectors to at least (boost pressure + normal injector flow rate) to compensate for boost pressure trying to force fuel back down pump. Recommend Ford 3.8L Supercharged or 5.4L Supercharged injectors. 5. Replace fuel pump to SC 3800 or larger flow rate. 6. Relocate the O2 sensor to before turbo. After is too cool, we do have a heated O2, but before is still better. 7. Alante intake? It can't hurt. 8. Ditch the muffler! Or get a high flow "loud one", as the turbo is a natural muffler, so the Cat Converter is plenty. 9. Pontiac did a Proto Turbo 3.8 Bonneville in 91. The weak point they ID'd was the trans. Need help in this category. Can a 4T65E be swapped in from a SC 3800 GP/Bonneville/Electra? They limited boost to 7-8 psi to save the trans on a series I 3800. This was the 165hp motor they used. 240 hp was the targeted hp. Anyone with more thoughts? Tom

would this work with a 91 seville. I see rarely any cadillac builds besides low riders so i wanted to make sun unique but not to much out about turbos for this car. it should be just the normal 4.9L and not the sts.