12 Valve 3.0L Montero working on going to single turbo.

[Ondonti]

Well the thing about full boost is that 6 pounds of boost can happen 1000 rpms before 20psi.
My question would be how soon do you want to build that boost assuming RPMs stay the same. Response time. Put a 5 speed transmission into 5th gear and you can make whatever boost you see at 3000 rpms...at 2000 rpms thanks to all the load. It will take awhile.

Stage 3 turbine in a .63 would probably have you pretty happy. I have never run a turbo that small to say. Manifolds will also be important in determining how well your turbo responds. Crap manifolds will require a smaller turbine (and decrease power gains).

[TainterRacing]

Well now say I am driving at 55mph. In OD I am at about 2400rpms. I come up to a hill and then It will start to drop speed and have to shift in to 3nd to keep speed up. I want to have some power in Lower rpms so it don’t shift out of OD every time I see a hill.

Background on the motor/montero This 3.0 was in a older montero. Was 500lbs less and had 4.64 gears. Now its 500lbs more weight and 4.27 gears and on top of that I have a stall that’s about 125-150rpms less then it was. And I all so run over sized tires. I am running the stock ecu for the tranny as its ECU controlled. It is setup for a motor that has 57HP & 60tq more then the 3.0 I have in there now.+ The Plan is get new tires Stock sized ones will know about 2in off in height. What I am looking for is to make it even or a bit better like 80hp and tq more.

Manifolds..... I wanted to make a nice set of SS manifolds Shc.40. But after looking in to it just parts will be pushing $400. So I am going to see what it will be if I run the stock manifolds. Modified..... Stock FWD manifolds both side. And stock crossover pipe. But to get them in there the crossover pipe. As to be very tight to the block. I will have to cut out a bit on both manifolds and get the pipe to line back up and re-wield the cast Iron. I know its a pain to wield the cast iron I have done it before and had it work for years. Then I will Slap a t3 flange on the passenger side manifold and box it on there how I want it and make a place for a 38mm Wastegate as well. I know that’s going to be one sucky manifold setup. But I am not looking to make a lot of power. But I think I will have a lot of back pressure and might get it to spool up nice and fast. I know its not going to pull much at high rpms but I will all most never rev more then 4.5K any how. Do you think this might work? If not I might just stay N/A do some good ex and maybe get some new cams off a car on this. And call it good. Any help would be great!

[Sundance 6g72]

problem with an auto is that it will downshift when more throttle is applied. in order to get boost, you have to give it some throttle. Do you have a way to keep the tranny locked in gear?

the small turbo will be fine as long as you never need to actually rev that high. The shelby model of the 3.0 had too small a turbo and i guess it ran out of steam before 5500rpms and made it a crap setup



sadly, i dont know the specs of said turbo.

[TainterRacing]

It realy dont want to down shift that ezly. I need to push it down like 30-40% down for it to kick down. I have it set right as well the kick down cable. And I do have a button to hold the tranny in gear I am not sure if I can use it in OD tho. I think it only works for the 1-3 I will test it next time I drive it.

[Mdoe8]

Sounds like you need a supercharger

[TainterRacing]

I have thought about that as well. The big thing is they still will be more then what I can do a turbo setup for. I think I can get the turbo on there for less then $500.

[Mdoe8]

Yeah completely understand. Supercharging can be expensive if you don't fab a lot of your own parts.

[RoadWarrior222]

Well now say I am driving at 55mph. In OD I am at about 2400rpms. I come up to a hill and then It will start to drop speed and have to shift in to 3nd to keep speed up. I want to have some power in Lower rpms so it don’t shift out of OD every time I see a hill.

Hmmm, it saves the tranny though, lug an auto and it will die.... and also a case of "why be afraid of RPM?" as long as it's not screaming at 4500+ for long periods, 3500 to get up hills ain't nothing.

[Sundance 6g72]

especialy for the 3.0

[Mdoe8]

I must say a remote mounted roots type blower would be a fun project! A gtp blower should get the job done and can be had dirt cheap. You should do it! Can even run an FMIC if you remote mount it! See pics below for what I mean.

[Sundance 6g72]

would an a543 5spd swap be out of the question?

[RoadWarrior222]

quite likely, this would be an RWDish setup, might find a manual trans in a Ram50 or MightMax.

[paduster]

i have found the super coupe supercharger for like 150 to 300 depending on how much comes with it and sometimes ready to go and put on. and with it being a truck and needing it down low boost with a supercharger would be the best in my opinion.

[Sundance 6g72]

quite likely, this would be an RWDish setup, might find a manual trans in a Ram50 or MightMax.

forgot !

[TainterRacing]

i have found the super coupe supercharger for like 150 to 300 depending on how much comes with it and sometimes ready to go and put on. and with it being a truck and needing it down low boost with a supercharger would be the best in my opinion.

Ya I was looking at them as well I think it still might be a bit more. I would want to get one that’s been rebuilt and would yet have to make an intake and then I would need to get a new belt as well. A supercharger is going to eat up the fuel. With the turbo you can get a bit better MPG.

[Sundance 6g72]

yeah turbo is nice. while i dont like how laggy mine is acting right now, its nice to have a car drive like its stock until you put your foot down.

[Mdoe8]

yeah turbo is nice. while i dont like how laggy mine is acting right now, its nice to have a car drive like its stock until you put your foot down.

Your car has duct tape holding the intercooler piping together though, you should be happy it's boosting at all!

[Sundance 6g72]

dude i know right. even when i have it done right, i might wrap it in duct tape any ways.. that way people will feel even worse about losing to me !! HAHAHA

---------- Post added at 01:56 PM ---------- Previous post was at 01:50 PM ----------

the thing is, if it caused it to not boost.. i would have fixed it by now. lazy american right hurr..

[Ondonti]

If you go with the crappier manifold setup then just drop the turbo size a bit. My real worry with a small turbo is controlling boost pressure when the 3.0 wants to scream. Especially with all that weight.
I don't see the need for a supercharger here, I just don't use turbo's that small because I want my fun just starting at the rpms he wants to give up at. The Shelby setup worked fine, you just have to shift at 5k and run a lot of boost to make up for the lack of RPMs if high power is what you wanted. Tire burner for sure.