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Post by Mark Smith on Oct 8, 2004 14:32:23 GMT 11
Hi there,
Got a couple of questions about intercoolers and 3.1 Mu's.
1) Where is the best place to mount the cooler ? I've been chatting a to a 4wd fan here at work and he recons they shouldn't be mounted above the engine using a scoop arrangement, says they soak up heat from the engine there and if you are towing a load up a hill and going slow you loose all benefit.
2) Does it matter how long the pipes are leading out the turbo into the cooler and then into the engine ? So for example the cooler was located up in front of the engine fan (somehow). Does the extra amount of pipe cause any issues with stuff like turbo lag ?
3) Does the engine need to be retuned if there is an intercooler ? How well does the engine cope say if one minute warm air is going in then the next cool, there isn't really an ECU on the Mu is there ?
4) Anyone done a good "How I did it!" guide for fitting an intercooler ? Including what bits they used ?
Thanks!
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Post by geeves on Oct 8, 2004 15:50:59 GMT 11
q1 yes you do get heat soak with the intercooler on top of the engine but this dosnt seem to affect temperature readings above 70kph I know people that have fitted fans or water sprays to reduce this. A front mounted intercooler will run cooler and can be bigger but will clog with mud in the same way a radiator does if you drive in that sort of stuff.
q2 yes but you probably wont notice Turbo lag is not realy an issue on diesels
q3 no issue no problem
q4 have a search through the engine mods section of this forum there are some good project rightups with pictures. Only big issue on the 3.1 is that the factory turbo inlet points the wrong way and cant be changed.There have been some inovative solutions posted One should work for you but expect to make some custom pipework
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wayne
Isuzu Baby
Love mods
Posts: 47
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Post by wayne on Oct 9, 2004 7:42:04 GMT 11
An intercoler mounted on top of the engine will still work with no hole in the bonnet. A front mount is the best option.
W.
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Post by Roger on Oct 12, 2004 17:42:01 GMT 11
If you get a cooler and its piping from a 3.1 Jackaroo, you should be able to do the top mount easily.
You'll have to unbolt and flip the 'intake into intercooler' pipe and get a mandrel exhauast bend for it to work.
If airflow is an isuue, fit a 9" thermo fan to it.
cheers
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Post by geeves on Oct 12, 2004 18:40:01 GMT 11
The factory turbo on the 3.1 engine is non servicable and the inlet canot be rotated This is why some people have use the earlier 2.8 turbo instead.
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Post by Mark Smith on Oct 13, 2004 7:16:54 GMT 11
The factory turbo on the 3.1 engine is non servicable and the inlet canot be rotated This is why some people have use the earlier 2.8 turbo instead. Hi there, Why does the inlet need to be rotated ? I was under the impression that air comes from the airbox, goes into the turbo, gets compressed and the goes to the engine from the turbo's output ... I thought the intercooler went inbetween the output of the turbo and the engine ? Surely you could just make up a pipe from the output of the turbo to the intercooler and the the output of the intercoller goes to the engine ? Or am I confused ? :-) Thanks! |
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MattMU
Isuzu Senior
Rodeo Now!
Posts: 206
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Post by MattMU on Oct 13, 2004 13:32:02 GMT 11
You are right Mark but without visualizing the setup, you miss the point of Geeves post. The intercooler does go in between the turbo and the engine. If you are fitting the Jackaroo setup, the turbo outlets do not match!! ie the angles of the outlet point in slightly differebnt angles! You can install the jackaroo Intercooler to the 2.8 with absolutely no fuss but there is a little bit of playing around with a 3.1. ie you can flip the outlet on the intercooler and then bend a loop of pipe so they match up, or source (as I did) a 2.8 turbo that you can swivel the housing on. Clear as mud  Matt. |
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Post by geeves on Oct 13, 2004 15:18:21 GMT 11
No your not confused it me The outlet is the problem not the inlet . Anouther thought that might work is the much smaller intercooler from a Pajero or even better the air-water intercooler from a Legacy GT but it would be all custom made mounts and plumbing.
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Post by Mark Smith on Oct 13, 2004 17:20:27 GMT 11
ie you can flip the outlet on the intercooler and then bend a loop of pipe so they match up, or source (as I did) a 2.8 turbo that you can swivel the housing on. About how much would a 2.8 turbo cost ? And is it the same spec ? (not going to be higher or lower boost is it ?) Thanks :-) |
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MattMU
Isuzu Senior
Rodeo Now!
Posts: 206
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Post by MattMU on Oct 14, 2004 12:29:17 GMT 11
OK, I was lucky... I had 2.8 turbo sitting around that I could slot in so there was no trouble fitting everything up.
I would not buy a 2.8 turbo if you were thinking along those lines, the cost would end up being the same as buing an over priced Safari intercooler kit for the Rodeo.
The newer IHI turbo (Justin has the part number) is a bolt on fit, higher output and I believe it is rebuildable and hence able to be rotated like the 2.8 one. So if you were that keen, or your turbo is on its way out, that would be the smart option.
My 2.8 turbo has a slightly lower output than the 3.1 one, which means it spools up much quicker but loses a biut of puff at the top end. The dyno guy couldnt believe the bottom end torque but propbably why I have also gone through 4 clutches in the last 100000km. The last one is custom built with twice the clamping force...so far so good!!!
Hope that helps!
Matt.
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Post by Roger on Oct 20, 2004 21:12:45 GMT 11
Depend on what you have to spend. Joe's got the top mount on his 3.1 turbo with some ingenuity thrown in for good measure. Will try to get pics for you.
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Post by GM6046 on Oct 24, 2004 9:43:24 GMT 11
G'day, I've attatched a picture of a topmount on my Rodeo, the turbo housing can't be rotated so I just made a few changes to the end tank on the intercooler instead. ![]() |
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MattMU
Isuzu Senior
Rodeo Now!
Posts: 206
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Post by MattMU on Oct 25, 2004 13:59:44 GMT 11
GM that looks pretty good, well done!!
Do you have any pics of the rest like bonnet scoop, intake skirt etc?
Thanks
Matt.
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Post by GM6046 on Oct 25, 2004 21:11:14 GMT 11
I'll see if I can dig some other pics out for you. I'm using the factory Rodeo/Jackaroo bonnet scoop.
-Stuart
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Post by Bruce on Oct 26, 2004 9:07:57 GMT 11
Hi Stuart, a couple of questions about your intercooler please.
Is the cooler free standing (held on by the inlet and outlet hoses)?
And the small hose coming out of the cooler above the turbo where does it go to?
Thanks Bruce
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MattMU
Isuzu Senior
Rodeo Now!
Posts: 206
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Post by MattMU on Oct 26, 2004 12:28:15 GMT 11
Bruce,
The hose goes to the fuel injection pump for boost compensation.ie if there is no boost then you wont get full fuel out of the pump. All MUs have it but ours comes out of the rear of the cross over pipe and then mixes with the rest of the emission hoses, that the Rodeo doesnt have!
As for the mounting, look at the inlet manifold and you will see the two LHS brackets that bolt the intercooler to the inlet manifold using the two holes on top.
Looks like the Fr RHS mount has been moved inwards slightly (welded tab near intake hose to turbo)
The rear RHS bracket dissapears at the back of the intercooler and mounts to the back of the block!
Hope that helps!
Matt.
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Post by GM6046 on Oct 26, 2004 17:40:16 GMT 11
Yep, Matt's answered the questions for me!  It's got 2 mounts on the inlet manifold side, as well as one on the front that bolts on a bracket off the exhaust manifold, and the same for the back... I had change the brackets a bit to move the intercooler as close to the inlet manifold as possible to make the turbo outlet line up easier. Cheers -Stuart |
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