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Post by cooledmu on Aug 21, 2007 10:23:52 GMT 11
I just got a bighorn intercooler and rather than play around with cutting the inter cooler tanks and shortening them to fit id rather change the turbo to a 2.8 one so i can just rotate the housing, question is will it fit without any trouble.
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Post by cooledmu on Aug 21, 2007 10:31:50 GMT 11
or should i try drill and retap my 3.1 turbo
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Post by geeves on Aug 21, 2007 15:59:01 GMT 11
It has been done before and works well. Its a slightly smaller turbo so you do loose a tiny fraction of your top end but gain a little at the bottom end. This is where the 3.1 is most happy anyway so probably not an issue
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Post by cooledmu on Aug 21, 2007 16:58:03 GMT 11
ok, how bout the idea of removeing my 3.1 turbo and drilling out the studs on the compressor housing, rotating it then, redrilling and tapping it in the rotated position. Im pretty confident on the spanners, i just need to know if it will work. I think that wastegate would need to be moved to. It goes on the road mostly so i dont really want to lose any top end.
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Post by geeves on Aug 22, 2007 7:52:51 GMT 11
it has been done Only one hole has to be redrilled but I cant help with details. There are a few traps for the unwarey
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Post by cooledmu on Aug 22, 2007 10:23:21 GMT 11
i guess making sure the housing was dead centre would be an issue
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Post by geeves on Aug 22, 2007 15:32:40 GMT 11
its the bearing that you have to be real carefull with. Its ceramic and easily broken. When broken you through whole turbo away. I belive the technique is to loosen it turn it then put all the screws in except the one that doesnt line up then drill and tap this one. You need to reseal with sealant but I dont think you can pull the whole intake section off as it destroys the bearing and thus the turbo
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Post by cooledmu on Aug 23, 2007 13:32:00 GMT 11
i tried taking the turbo out yesterday, got all the manifold bolts undone, and the dump pipe nuts undone, but i cant get to the 2 bolts that hold the oil return pipe on the underside of the turbo. Its a rite pregnant dog. Anyone have any ideas? i can see why some people just get new tanks put on the intercooler.
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Post by dasnoboarder on Aug 23, 2007 14:29:16 GMT 11
It is a good time to let out some of those bad words you've been storing up getting that pipe on and off.
I found with a 3/8" ratchet and extention, a torch, and a hand through the wheel well (had to take off inner guard) I got it off within 30 mins ...
Getting it back on (I hadn't done any work like this before) took 2 people and 2 hours... Haha.
Andy.
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Post by cooledmu on Aug 23, 2007 19:58:55 GMT 11
yeah i let a few words go, and managed to kick the dam thing to. I think im just guna be slack and put a silicone 90 on the compressor outlet, and then get a stainless pipe bent up to go from the 90 up to the intercooler. May even just can it altogether,
Does it really make all that much of a difference.
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Post by cooledmu on Aug 24, 2007 16:42:47 GMT 11
got it off at last, wasnt to hard after haveing a proper look at it. Got the housing undone and have rotated it havent tightnd it yet as i want to put more sealent on it, just got to drill and tap a hole, then work out if i can remount the waste gate, or just weld it open and go for an after market unit mounted on the dump pipe.
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beau
Isuzu Baby
green just doesn't cut it
Posts: 37
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Post by beau on Aug 26, 2007 22:31:55 GMT 11
they other way around the waste gate issue is to weld it shut (or just bend the actuator arm)
get a 99 dollar blow off valve from supercheap auto and plumb it in. the spring is adjustable
so you can control how much boost you run even though the turbo is spooling hard from start up'.
it'll make those young street racers look twice when they hear that coming down the street while there parked up in there nissan skylines.
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Post by dasnoboarder on Aug 27, 2007 7:00:25 GMT 11
Wouldn't having no wastegate on the echaust side and venting boost with a BOV allow the turbo to spin too fast and cause damage?
Just a thought...
Andy
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Post by cooledmu on Aug 27, 2007 13:38:30 GMT 11
got it all sorted, i have removed all of the internal wastegate and taped the port, i have pluged it with a steel threaded bung and sealed the thread with super high temp loctite. For now i have just threaded the hole where the actuator arm comes through to the outside of the turbo, and put a bolt in it, im going to use that hole later for a temp guage.
Im going to use the EGR flange on the exhaust manifold for the wastegate.
Blowoff valve wouldnt work as they operate on vacume not posative boost.
Ill chuck some pics up as i go.
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Post by dasnoboarder on Aug 27, 2007 13:59:33 GMT 11
I had thought of putting an external wastegate onto the egr plate, but thought it would be too small. Will be interested to see how it comes together  Andy |
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Post by cooledmu on Aug 28, 2007 14:50:26 GMT 11
should be big enuf, im going to use a 38mm wastegate.
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beau
Isuzu Baby
green just doesn't cut it
Posts: 37
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Post by beau on Aug 31, 2007 15:48:32 GMT 11
Wouldn't having no wastegate on the echaust side and venting boost with a BOV allow the turbo to spin too fast and cause damage? Just a thought... Andy i have done this to my truck and have no problems. it pulls 135kms an hour up the mangaweka deviation(im not saying anyone else should try this) and maintains that speed too. and to put it plainly... if the shaft and impella, exhaust turbine are that far out of balance to cause viabration/damage its time for a new turbo... |
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beau
Isuzu Baby
green just doesn't cut it
Posts: 37
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Post by beau on Aug 31, 2007 16:03:02 GMT 11
got it all sorted, i have removed all of the internal wastegate and taped the port, i have pluged it with a steel threaded bung and sealed the thread with super high temp loctite. For now i have just threaded the hole where the actuator arm comes through to the outside of the turbo, and put a bolt in it, im going to use that hole later for a temp guage. Im going to use the EGR flange on the exhaust manifold for the wastegate. Blowoff valve wouldnt work as they operate on vacume not posative boost. Ill chuck some pics up as i go. ok for anyone who would be or is considering a blow off vavle heres how to hook one up on a engine that cant create vacuum (eg no throttle body)..... when my engine was rebuilt i sorta took everything off that i couldnt see made an improvement to the end horsepower result. that included all those damn little vacum lines and vavles up on the top left gaurd of the engine bay.... the positive pressure balloon on top of the diesil injector pump was plumbed (via tee) straight to the waste gate actuator pipe. on the alternator is the vacuum pump for the brake booster there is another smaller hose there... plumb a small hose from there to the fitting on the BOV via of those (now redundant) vacum vavles ... on the diesil injector set up is a micro switch set up to operate when the accelerator is in the idle position.... (on vehicals with auto trans there are two) after an exhaustive exploration of the wiring loom to find what this switch actually did( 10 minutes and two beers later) i decided it was better suited for its new purpose operating the vacum valve ( aforemention now fitted to bov.) check the current to find which side is positive. take the opposite wire and run to the vacum valve then create a circut by earthing the other wire of the vavle to the chassis. note BOV will work best the closer to the turbo it is. i fitted mine to the inter cooler pipe joining the turbo and the intercooler. you may have to tinker with the spring rate on the BOV to get it working sweet but it should be raltivley ok. |
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Post by cooledmu on Aug 31, 2007 21:06:04 GMT 11
i had a look at the wastegate im getting and id say its flange is pretty close to the same shape and size as the EGR flange, strait bolt on maybe, then just got to run a silicon line from the compressor housing to the wastegate, Im just unsure if i should go with the 14.5psi spring it comes with, or go down to a 10psi.
What do they run normally, i have a top mount and thats it.
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beau
Isuzu Baby
green just doesn't cut it
Posts: 37
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Post by beau on Sept 7, 2007 21:47:44 GMT 11
4 psi standard, around 10 psi if you plug the wastgate actuator anything above may require a boost controller
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