austinjoe13

I know, I know, another turbo thread. I was walking back from class today and started thinking about how much stuff would actually go into it for an engineering project. The biggest thing I'm looking at is cost, I need to know if I can afford it or not.

Here's what I know goes into it, please fill in the blanks.

Turbo (T4?)
Manifold
Ducting
Wastegate
Oil Lines
Electronics

What happens to all of the vacuum controlled stuff? Will the HVAC still work?

Thanks in advance

austinjoe13

This would all be on a renix

CobraMarty

All the vacuum stuff must still see vacuum and no boost (HVAC, brake booster, fuel tank purge, CCV). Except the MAP sensor, the IAT sensor, vac/boost gauge, and FIC or FTC for fuel and timing control, they can all see boost. That is a problem with turbo and 'blow thru' the TB, where do you find vacuum only with no boost.

If you allow boost/positive pressure to go to HVAC- you lose controls when under boost like defrost, brake booster- lose function when under boost, fuel tank purge- pressurize your fuel tank when under boost, CCV- pressurize engine when under boost.

salad

See inside for a turbocharged 4.0 build thread: http://www.naxja.org/forum/showthread.php?t=1031285

austinjoe13

What did you guys do for the two S/Ced jeeps?

And how necessary is an intercooler for a system running at 4psi? I suppose the same question for the stock tune also.

austinjoe13

I looked up some of the bigger parts and it's looking like this would cost around $1000 if I were to go with a godspeed t3/t4 off of fleabay. I know you get what you pay for but for wanting to run only 4psi how big of a deal could it be?

CobraMarty

We are able to plumb them under the TB but before the SC.

No intercooler needed at 4 pounds boost, as long as your IATs stay under 200 degrees.

austinjoe13

Ok, so I could do the same with a turbo, right? Plumb them in the intake ducting before the turbo?

If I don't end up doing this for a project, I may still do it when I get out of school. It seems simple enough

CobraMarty

There won't be sufficient vacuum there to work the accessories. The vacuum is created after the TB. Maybe an electric vacuum pump would work?

RubberSideUp

If you have to ask if you can afford it you probably can't.

austinjoe13

I had that thought too. As a school project it would definitely have it's challenges.


Or I like to know every little detail about any project Before I jump into it

PseudoSport

Normally for vacuum stuff like the brake booster and vacuum canisters there are check valves inline. There is low manifold vacuum at WOT on an N/A engine anyway so usually there is already something in place.

salad

XJs just have a reservoir hiding in the front bumper. No check valves.

For some reason I thought that vacuum system and CCV stuff was just plumbed to right before the turbo

RubberSideUp

"Or I like to know every little detail about any project Before I jump into it" It'll still throw you a surprise here and there. Which is half the fun.

Gee oh Dee

Thanks for the incredibly enlightening posts.