It's getting dull in here. So---

[Richie18]

rocket5957,
how about a twin turbo setup for a purpose built 4.0 SOHC in a 03 Sport Trac? Just wonder if it's "rationally" possible...?

 

[Xan]

Haha insomnia, it was saturday night! i was out with girls at a bar then at my house till 3am hows that for insomnia

 

[A Wise Guy]

Could not have been too good if you were paying attention to the clock.

 

[Xan]

Could not have been too good if you were paying attention to the clock.

i always look at the clock and my phone before i go to bed

 

[SkanlaxJMO]

i always look at the clock and my phone before i go to bed

^^

 

[rocket 5979]

rocket5957,
how about a twin turbo setup for a purpose built 4.0 SOHC in a 03 Sport Trac? Just wonder if it's "rationally" possible...?

It is possible to do TT's in the 4.0 and make it function VERY well but it would not really be necessary unless you are talking about a fully built engine with built 5R55S tranny swap and pushing 500+ hp. A single turbo system will give you great gains and not break the bank either.

 

[Richie18]

I'm looking to really put some horsepower at the wheels, because of this i've already considered a purpose built block, like lower compression pistons and other changes.

Also, Regardless of going either single or twin turbo i was more than likely going to swap to a 5R55S, since either way the horsepower numbers i am looking for would be too much for the 5R55E.

So with all that in mind i would really like to find out more about the big differences in performance between a twin turbo setup vs a single one. I lack a general knowledge for turbos which is why i am even asking so bear with me. When comparing a twin to a single setup would a twin use two small turbos vs a single big turbo
or would a twin use a small and medium size turbo vs a single big turbo?

I guess i wondering would it be possible/wise to do a twin turbo with a small turbo for instant low end boost and a bigger turbo for the top end. I consider the Sport Trac more of a truck and i really appreciate the low end torque it takes to accelerate moderately and was wondering if this could satisfy my wants

 

[rocket 5979]

I'm looking to really put some horsepower at the wheels, because of this i've already considered a purpose built block, like lower compression pistons and other changes.

Also, Regardless of going either single or twin turbo i was more than likely going to swap to a 5R55S, since either way the horsepower numbers i am looking for would be too much for the 5R55E.

So with all that in mind i would really like to find out more about the big differences in performance between a twin turbo setup vs a single one. I lack a general knowledge for turbos which is why i am even asking so bear with me. When comparing a twin to a single setup would a twin use two small turbos vs a single big turbo
or would a twin use a small and medium size turbo vs a single big turbo?

I guess i wondering would it be possible/wise to do a twin turbo with a small turbo for instant low end boost and a bigger turbo for the top end. I consider the Sport Trac more of a truck and i really appreciate the low end torque it takes to accelerate moderately and was wondering if this could satisfy my wants

Think of it this way. Take your 4.0 V6 engine and divide it in half. You will essentially have a 2.0 liter 3 cylinder engine bank pushing one turbo and another 2.0 liter 3 cylinder engine bank pushing the other small turbo in a regular twin turbo system. The turbo's in a conventional twin system will be much smaller than if there was just a single turbo on that same engine. The turbos in the twin system will also be the same exact size as each other.

Depending on what kind of horsepower you are looking for you might have to also have the 5R55S transmission you plan to swap into there built also. Level Ten builds these transmissions to handle 700+hp currently.

If you really have a pretty large budget then go TT. I am talking $15-$20k then do the twins and all the rest of your mods. If you do not have that kind of money then go with the single and still be real happy. When sized correctly singles can spool real quick too.

 

[Jakee]

Pinks is not geh rocket, you are! that's my favorite show so watch it!


No, twins on the 4.0 SOHC is gonna get you nothing because you can get a properly sized single and have great power thru-out the power-band.

Now if you were going to sink a fortune into building the block then maybe twins could help to get power thru-out the rpm range, but I've seen twins go on these motors, only to go single in a few short months.

 

[Jakee]

Okay, plan B....let's see how many conversations we can have going in this thread at one time.

 

[Richie18]

Great thanks for the input. Sounds like the single would be cheaper, easier and provide nearly the same results. When going with the single turbo what one/size would i pair with the 4.0? I'm not sure if this is completely relevant but i do appreciate the low end torque.

I would be looking for somewhere around >=400RWHP.

 

[Xan]

Low compression pistons with forced induction = less power...

 

[Richie18]

:scratch: Of course going with lower compression on any engine is going to lower horsepower...But the engine will be built for a turbo meaning i can run more boost safely. The reliability/longevity of the engine will be much greater with pistons suited for force fed application.

 

[Jakee]

I believe the perfect compression to go for would be 9:1 or 9:2. Unfortunately, the pistons available to us are 8:1 (much to low for good power, but safer). I think I'll have some customs made from wesco when I get to that point, if I do get to that point.

You can get to 400 HP with the stock motor, a good turbo, and a really good tune. I've even heard of centrifical superchargers on the 4.0 SOHC break 400 HP on the stock motor.

If I were going to do a front mount turbo, I'd probably use the precision PT61. Check out powerhouse.com and use the research they've already did. It's going to be hard to fit a front mounted turbo in the X. You'll have to move a bunch of stuff around. There's always the STS remote mounted option for you.

 

[rocket 5979]

Pinks is not geh rocket, you are! that's my favorite show so watch it!

Have another beer Jakee.

I believe the perfect compression to go for would be 9:1 or 9:2. Unfortunately, the pistons available to us are 8:1 (much to low for good power, but safer). I think I'll have some customs made from wesco when I get to that point, if I do get to that point.

With a turbo I would have to agree that 9-9.25:1 would be a good CR to go with. This will allow the engine to not be a total dog off the line before the turbo have fully spooled.

 

[Richie18]

I'm not interested in a front mount as i think the remote mount would be the easier of the two. The 9.7:1 compression is just a little high from my limited knowledge to be running a turbo since i want to get atleast 400hp at the wheels which i think is going to require more boost.

rocket you never did say what is the right size turbo for my application?

 

[Xan]

:scratch: Of course going with lower compression on any engine is going to lower horsepower...But the engine will be built for a turbo meaning i can run more boost safely. The reliability/longevity of the engine will be much greater with pistons suited for force fed application.

Sure the engine will last longer, but are you gonna drive your turbo charged custom built engine truck as an everyday driver?

 

[Richie18]

I plan on it. If i put that type of money i want to drive the heck out of it and get it's worth to me out of it. To me that is driving the Sport Trac daily. While some get more pleasure on weekend drag strip runs i get the fun out of knowing that i put it together and it's solid and works everyday. For some reason i just love the idea of sleeper cars/trucks. Doing this kind of modification fits right in with that, knowing that i have a lot of horsepower even though you would never guess it.

 

[jah81592]

You could always unban spindle. I'm sure him and I could liven the place up.

That is some funny sh**. LOL

Because that would be ghey Jakee.

Nothing against anyone in here but that pinks show is retarded.

Pinks is really ghey when the give a gazillion car lead.

It is possible to do TT's in the 4.0 and make it function VERY well but it would not really be necessary unless you are talking about a fully built engine with built 5R55S tranny swap and pushing 500+ hp. A single turbo system will give you great gains and not break the bank either.

You forgot to mention valve springs! That is currently my problem.....

I believe the perfect compression to go for would be 9:1 or 9:2. Unfortunately, the pistons available to us are 8:1 (much to low for good power, but safer). I think I'll have some customs made from wesco when I get to that point, if I do get to that point.

You can get to 400 HP with the stock motor, a good turbo, and a really good tune. I've even heard of centrifical superchargers on the 4.0 SOHC break 400 HP on the stock motor.

If I were going to do a front mount turbo, I'd probably use the precision PT61. Check out powerhouse.com and use the research they've already did. It's going to be hard to fit a front mounted turbo in the X. You'll have to move a bunch of stuff around. There's always the STS remote mounted option for you.

I like higher compression (9.5-10.0:1) and higher boost combinations.-j

 

[rocket 5979]

You forgot to mention valve springs! That is currently my problem.....

Didn't forget. Just didn't want to spend too much time listing all supporting mods needed to run the setup. I have found, as I know you are well aware of, that the more technical jargon I throw out there the more I tend to confuse and overwhelm people. I am trying to keep things simpler.

I like higher compression (9.5-10.0:1) and higher boost combinations.-j

Yep. I like a turbo with higher CR and mid range boost depending on how built the engine is. For a positive displacement supercharger I like low CR and high boost with an efficient intercooler and heat exchanger.