Jeep 4.0 with HX35 turbo?

[GO 4LO]

We're thinking about trying to turbocharge my buddy's Jeep 4. 0 inline-6 and are leaning toward trying a stock HX35 off a Dodge. We'd only be aiming for 6-7 psi, not 40 . What do you think - will this turbo be sized about right? How quick do these turbos spool on gassers?



Chris

 

[drewRoberts]

I dont think the engine would have enough exhaust enertia to spin it up even at high RPM. something smaller would work good. I have a Garret T3 sitting on my bench waiting on final conclusion as to what will happen to it. go into my little yoda, or become a gas turbine.

 

[HoleshotHolset]

An HY-35W with a 9cm² housing would probably spool up pretty well...

Even a 12cm² housing on a HX-35W would be kinda big.



Matt

 

[Sled Puller]

I drove a 4 cyl Ranger with a First Gen turbo. It spools at about 6000rpm, and then she gets SQUIRRLLLEY. Oo.



It launched the head right off, then they rebuilt with studs, etc. 22psi. Then it blew also. 280 HP on the rollers.



I would definateley try one on the 4. 0--properly wastegated, of course.



Not much room in there.

 

[HoleshotHolset]

Not much room in there.

The turbo kits I have seen for the 4. 0L have the turbo on the passenger side of the engine - where there is lots of room. The OEM 'downpipe' is replaced with a new 'up' pipe that feeds the turbine inlet... and you get a new downpipe that connects to the OEM exhaust on the passenger side.



Here's a good article: http://jpmagazine.com/techarticles/engine/154_0508_turb/



And the vendor's site:

http://www.505performance.com/01Prod.html



Matt

 

[GO 4LO]

Our plan is to do a custom exhaust manifold and dump the turbo almost directly into the throttle body. (Or possibly mount the TB upstream of the turbo. ) Then use water injection to cool it instead of an intercooler. Won't have the frictional losses of all the extra piping in the 505 sytems that way.

The current plan is to try a 35 with the 12 sq cm housing. I figure it will spool a little slower than the 5. 9 will spool it, but he's also got more rpm than a stock CTD to run it through. If we could get it to start spooling by 2k or shortly after, I think we'd be in good shape. I believe 505 claims theirs is at full boost by 1800 with a T60...



Chris

 

[HoleshotHolset]

What size exhaust housing does the T60 have? It's probably a . 63 A/R - which is about the size of a 9cm². (The . 63 A/R is a lot closer to 9cm² than 12cm²... )



Water injection is fine and dandy - if you have a big enough reservoir. You'll need to spray it all the time... or run really low boost (~4psi). That's where the air/air intercooler helps out a lot. Wranglers have a lot of room in front of the radiator to install an air/air. I've found some (brand new) little IC's on eBay for short coin ($150)... and you never have to refill a reservoir.



Matt

 

[GO 4LO]

I don't know anything about their turbo really - just that it's a T60 (buddy told me that). Planning on running a ~10 gallon tank for water injection.

The Jeeps do have plenty of space to put an IC up there, but with a winch partially blocking the already barely-adequate radiator, we're a little afraid of overheating probs if we do that. Plus, it'll add a lot of pipe and intake restriction compared to water. Still might go that route - I hadn't realized the little IC's were that cheap. I'll have to check around some on ebay. Thanks!



Chris

 

[HoleshotHolset]

Interesting - I didn't realize that the OEM radiator was inadequate. I know that my old GMC gasser used to get hot when I'd plow snow with it. That problem completely went away by installing a 'flex fan'. The OEM radiator worked fine with plenty of fresh air moving across it... and I beat the stuffing out of that truck on a daily basis.



The amount of pipe you'd add with a front mount air/air intercooler isn't anything to worry about. Millions of vehicles have at least 8' of pipe/intercooler to go through between the compressor discharge and the intake. If you look at our Dodges - there's probably close to 6' of intercooler pipe alone... nevermind the 3-feet of intercooler core. Keep the pipes small (2. 5" or so... ) to keep the air velocity up, unless he's running really high RPM all the time. Keeping the bends nice and gradual will also help a bit... but the gains are minimal by going overboard in this area.



Daily driven (or steady state driven - runtime of more than 30 seconds or so... ) vehicles benefit significantly from intercooling versus water injection. Sure, water will cool things down a lot... but you're always at the mercy of the water level inside the reservoir. Don't get me wrong, I love water injection... but I believe that it should only be used in conjunction with traditional inter/after cooling methods.



Matt