Boostwerks.com turbo XJ build...

[KamekLocked]

Atmospheric pressure is 14.7psi rounded off. I'm confused on your calculations there.

 

[xSUx SGT BAKER]

Atmospheric pressure is 14.7psi rounded off. I'm confused on your calculations there.

6.00/14.7 = 0.408 or 40.8% assuming that the 6 psi measurement is as accurate as the 14.7 psi measurement:eyes::shhh:

 

[yossarian19]

So, with 40% more air and 40% more fuel I'd expect 40% more power, call it about 70 more horses, total in around 260 without any additional mods (open up intake / exhaust for more) and greater volumetric efficiency. I think. If yes on the volumetric efficiency - then better fuel economy and greater available power at highway speeds.

Push it to seven or eight psi of boost and reliability begins to be an issue - head gaskets, con rods, oiling, temperature, fuel delievery and even the crank could become issues. at 6 psi... the 4.0 is supposed to be pretty safe.

 

[xSUx SGT BAKER]

So, with 40% more air and 40% more fuel I'd expect 40% more power, call it about 70 more horses, total in around 260 without any additional mods (open up intake / exhaust for more) and greater volumetric efficiency. I think. If yes on the volumetric efficiency - then better fuel economy and greater available power at highway speeds.

Push it to seven or eight psi of boost and reliability begins to be an issue - head gaskets, con rods, oiling, temperature, fuel delievery and even the crank could become issues. at 6 psi... the 4.0 is supposed to be pretty safe.

agreed. i really cant wait to see the outcome of this build. hopefully i can do something like this on a stroker and have some real fun

 

[seanyb505]

agreed. i really cant wait to see the outcome of this build. hopefully i can do something like this on a stroker and have some real fun

Thats the path Im on. Ive already got a low compression stroker, Im just waiting on a manifold and some funds. Both are hard to come by

 

[CSaddict]

Why, yes! It is! A gold star for you! Good job!

6 psi is a safe boost level on the 4.0 and ~40% over atmospheric pressure. I'm not an expert, but it isn't random that I'd go six instead of 8...

So you feel that 6 psi from a gt17 would be the same as 6 psi from a GT42R? Its certainly not PSI. It volume/CFM. So yes it is random.

 

[JJacobs]

Why wouldn't it? I'm out in left field here and don't know much about turbos. But for the sake of argument, the engine knows nothing about what boosting apparatus is in the engine bay. All it knows is that there's 6, or 8, or whatever psi in the intake plenum right now.

Correct?

 

[seanyb505]

It kinda depends on how hard the turbo works. If it works harder the air will be hotter, which equals not as much power than if the air was colder(more dense). Small turbos work harder for more psi but spool faster. Big turbos dont work as hard but wont spool as fast. The turbo is part of the engine too, its just on the back 9.

 

[Boostwerks.com]

Why wouldn't it? I'm out in left field here and don't know much about turbos. But for the sake of argument, the engine knows nothing about what boosting apparatus is in the engine bay. All it knows is that there's 6, or 8, or whatever psi in the intake plenum right now.

Correct?

where

is the absolute pressure of the gas,

is the volume of the gas,

is the number of moles of gas,

is the universal gas constant,

is the absolute temperature. To account for how much mass of air exits the turbo, you must understand both it's pressure and flow because it's an overall dynamic process.

Sure 6 psi is the same as 6 psi, but once you start moving that air at different rates...thats where you get the power differences between different sized turbos. If this wasn't the case, why even make different sized turbos?

I'll ask a mod to delete my posts. Sorry man.
I just want to see this manifold done... unlike the last two times

Actually the first time was done. Unfortunetly though it wasn't my manifold, but for a customer. The reason it didn't work well for him was because I didn't have the specific turbo he ended up using, so there was only so much I could do. If he used the same T3/T4 I did the fab work with, it would have worked just fine.

I wanted to make the remote mount kits happen simply because of the cost factor. I would have been able to offer a complete kit for CHEAP. That was the only reason why I gave it a shot, but unfortunetly it's a no go.

I simply went back to my first design (which worked), and am making some small changes to enhance fitment, cut costs and reduce fab time.

:sunshine:

 

[urban yan]

I simply went back to my first design (which worked), and am making some small changes to enhance fitment, cut costs and reduce fab time.

:sunshine:

Good. I'm going to hold you to it.
No one's coming down with tealcherokee syndrome on my watch.



-

 

[CSaddict]

No one's coming down with tealcherokee syndrome on my watch.
-

LOL

 

[seanyb505]

TCS- when you start something awesome but quit for some mysterious reason. Example: "Hey Tim did you ever finish that Hemi Daytona restoration?"
"No, I came down with TCS."

 

[gradon]

Now that you mention him, I haven't seen teal in a while.

 

[seanyb505]

I think he goes under rock kustoms now, at least over on Jeepforum. Hes on aim every once and a while, too.

 

[urban yan]

Bump for a little update. I received my SYE and rebuild kit from JB conversions. Just waiting on my TW driveshaft to do the install. I wanted to make sure my TC could take the power before I did the turbo install. I should be doing the rebuild in a couple weeks, and turbo install a couple weeks after.

It's been roughly 6 weeks since you made this post, so what's happening?
a) progress b) tealcherokee syndrome

 

[seanyb505]

c) Christmas and the holidays

 

[Boostwerks.com]

c) Christmas and the holidays

Bingo.

Along with waiting on a couple of my vendors, and a lot of stress from my day job that I havn't even thought of this project in the last couple weeks.

On that note, I'm the operations manager for the company:
www.Corteksystems.com

We've landed almost too many fabrication bids, and have also been installing a 300ft long 6 ton crane into our shop at the same time = just a little stress.

I havn't bailed. Just taking my time.

 

[urban yan]

c) Christmas and the holidays

Man, I wish I could use the Holidays to put-off my projects. If anything, the Holidays force me to get stuff done quicker.

Bingo.

Along with waiting on a couple of my vendors, and a lot of stress from my day job that I havn't even thought of this project in the last couple weeks.

On that note, I'm the operations manager for the company:
www.Corteksystems.com

We've landed almost too many fabrication bids, and have also been installing a 300ft long 6 ton crane into our shop at the same time = just a little stress.

I havn't bailed. Just taking my time.

Than don't give time-estimates next time man.
You should-have learned your lesson from last time you promised turbo piping.

 

[GrimmJeeper]

Than don't give time-estimates next time man.
You should-have learned your lesson from last time you promised turbo piping.

wow, harsh!

 

[urban yan]

sorry man.
I know I sound like an ass, but I just can't shake that JF thread out of my mind.