The turboz...it be dead and stuff. Let's play "what happened?". - Page 2 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 12-11-2010, 07:45 PM   #21
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In for the resurrection.
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Old 12-11-2010, 08:45 PM   #22
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Quote:
Originally Posted by Doppelgänger View Post
Whatchu puttin' down at 18psi?
Will know next weekend.
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Old 12-11-2010, 09:15 PM   #23
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So you're going to attempt 300whp on a 2560 and stock motor Dopple?
This should be interesting.
Make sure to post up vids/dynosheets.


And lev you're running 18psi on your 2560 now?
w/i or straight pump?
Is it just me or are people running a WHOLE lot more boost on their stock engines these days? lol mt.net community finally growing *****?

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Old 12-12-2010, 01:09 AM   #24
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Well...something that might help get me closer to that 300 mark would be one of those phantom squate-top intake manifolds that everyone keeps popping up with :/

Local guy here made 290 on a 2560...though not a stock engine, it was low-compression. Figure I'll be using the same tuner, have higher compression and VVT...I might get pretty close to 300




BTW- I got the turbo back this morning. I thought I would have had it last night but issues popped up. Diesel Performance & Electric came through with the CHRA replacement and was even nice enough to reassemble the turbo for me for all of $515. Great guys. I'd recommend them to anyone getting a turbo built/rebuilt or to order stuff from. Anyway. I picked it up at 9am, made the drive half way across Atlanta to pick up a new exhaust manifold gasket, drove back to the other side of town by 11:30 (120 ******* miles in one morning!!!) and started putting everything back together around 12 noon. I did pick up some new oil/water lines and whatnot for the install. I had the car running by 3pm...without any issues. Mind you guys I had to lift the engine up to get the turbo/manifold off and get the engine back down and into place by myself. Had to install all the new water lines, cut the new oil drain line, install all the fittings on the turbo. As soon as the last bolt was tightened I started the car, changed shirts and drove 40 miles to the airport to pick my GF up.


OMG this new turbo feels sooooo much better. I guess my turbo had been choking up for sometime..but the slow death wasn't really felt. Now I'm getting 4-5 psi at like 2300rpm and response/threshhold is noticable better.
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Old 12-12-2010, 01:34 AM   #25
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Quote:
Originally Posted by Doppelgänger View Post
Well...something that might help get me closer to that 300 mark would be one of those phantom squate-top intake manifolds that everyone keeps popping up with :/

Local guy here made 290 on a 2560...though not a stock engine, it was low-compression. Figure I'll be using the same tuner, have higher compression and VVT...I might get pretty close to 300




BTW- I got the turbo back this morning. I thought I would have had it last night but issues popped up. Diesel Performance & Electric came through with the CHRA replacement and was even nice enough to reassemble the turbo for me for all of $515. Great guys. I'd recommend them to anyone getting a turbo built/rebuilt or to order stuff from. Anyway. I picked it up at 9am, made the drive half way across Atlanta to pick up a new exhaust manifold gasket, drove back to the other side of town by 11:30 (120 ******* miles in one morning!!!) and started putting everything back together around 12 noon. I did pick up some new oil/water lines and whatnot for the install. I had the car running by 3pm...without any issues. Mind you guys I had to lift the engine up to get the turbo/manifold off and get the engine back down and into place by myself. Had to install all the new water lines, cut the new oil drain line, install all the fittings on the turbo. As soon as the last bolt was tightened I started the car, changed shirts and drove 40 miles to the airport to pick my GF up.


OMG this new turbo feels sooooo much better. I guess my turbo had been choking up for sometime..but the slow death wasn't really felt. Now I'm getting 4-5 psi at like 2300rpm and response/threshhold is noticable better.
That's awesome. Damn that gradual degradation!
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Old 04-11-2011, 12:41 PM   #26
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I'm diagnosing a slow to build boost issue right now.


Quick question for you Doppleganger. As your turbo was dying could it still make it to double digits of boost? Lately mine has been getting slower and slower to build boost but will eventually make 14 psi. Just wanted to know that as your turbo was going bad was it also able to produce higher psi?

I was checking the cold side for leaks and I the turbo spins fine. Sometimes if I push on the vanes while spinning by hand there is some drag, but that is sort of an intentionally side loaded test. I've idled the car with the intake pipe off and it spins fine. Is there any real test for the wear and life on the bearings? Could I set the parking brake, load the engine in 1st, build a little boost while the car is not moving and then have someone listen and watch the turbo to see the spin down results. Are there any visual cues to note ?
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Old 04-11-2011, 01:13 PM   #27
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Yes. I was still able to achieve target boost, but boost threshhold was much slower/higher rpms (instead of 10psi at 3k rpms, it was closer to 4k before it let go). There were no other signs other than a "laggy" threshhold. Even between gears it returned to boost fairly quickly...but not like a fresh turbo. I had tinkered with it maybe 2-3 months before the tailure and all felt well when turning the blades by hand...though I didn't push and turn. Also, there was kind of gut-feeling that something wasn't quite right and the car didn't feel like it was pulling like it should have.

how old is your turbo? How many miles?
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Old 04-11-2011, 01:35 PM   #28
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Spool information is very useful here. I am running my china 2560 at 14psi, and with a full 3" turboback strait pipe, it's spooled by 4k... not nearly what I was expecting it to. Not only that but it sounds like ***.

Inb4BOOM. Guess I'll have to save up 600 for that genuine 2560...
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Old 04-11-2011, 01:45 PM   #29
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I don't do a lot of datalogging when things are running like they're supposed to....sooo....yeah. I know I'm getting 14psi well before 4k though.
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Old 04-11-2011, 03:29 PM   #30
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about 20,000 yankee doodle dandees or up here equiv. of more that that in kilometers

I also have a weld that failed in the wastegate tube of my SGDP right at the turbo flange. Really that should be looked at first. Once I pull the DP I'll better be able to diagnose that crack and the turbo hot side, and I should see how the WG is sealing to the port.

Last edited by Landrew; 04-11-2011 at 03:43 PM.
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Old 04-11-2011, 03:52 PM   #31
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Quote:
Originally Posted by Doppelgänger View Post
Yeah, I got a hold of someone at Diesel Performance and Electric and described it to them. Pretty much "died of old age"...nothing really one thing or another. An oil starvation issue would have resulted in frozen bearings or an esploded shaft. New CHRA will be $480 + tax, it's in stock and I can pick it up because they're local.
Contact info for diesel performance and electric? Can't find a phone # on their site.
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Old 04-11-2011, 05:55 PM   #32
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Bah...I always get the name of the place wrong.. it's Turbo Diesel and Electric

Mailing Address
Turbo Diesel & Electric Systems
231 Main Street
Forest Park, GA 30297

Phone Numbers:
Phone: (404) 361-2222
Fax: (404) 361-1701

Ask for JD.
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Old 04-23-2011, 03:57 AM   #33
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After the car has sat for hours if I pop of the intake tube and spin the shaft under pressure in a vertical and horizontal plane should there be any resistance at all? I never hear the sound of it contacting the housing by hand or when in boost but I do feel some drag when spinning by hand and applying a side load. Since the turbo needs oil pressure how should it feel after sitting for some time should it be like an axle on a bike wheel, free to spin under load in every axis?
I need to get it diagnosed before I take it to far apart so I can have the new turbo (if needed) ready to install.
That's a problem with a DD, can't afford to much down time.
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