Turbo installed. Lasted 4 days. Threw a rod. - Page 4 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 08-25-2014, 12:37 PM   #61
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With tq being that much higher than hp (158hp, 181tq), it sounds like something was really choking the motor at higher rpms. I don't think I ever remember seeing numbers that lopsided on a BP.
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Old 08-25-2014, 12:49 PM   #62
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I'm going to say it may have been overrevved at some point, stretching and stressing the rods a bit, which has been known to happen in our engines. The weakened rods would then not take nearly as much torque before yielding.
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Old 08-25-2014, 12:54 PM   #63
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Quote:
Originally Posted by concealer404 View Post
OP, just as a reference point...

Here's a 2554 on 10psi.
That's obviously not a 2.25 downpipe and log manifold. And also not normal for a 2554.

Remember, the OP is unsure which t25 style turbo he has.
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Old 08-25-2014, 12:54 PM   #64
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I missed that part in the shitting OP. Is this a 2554? My own made the numbers in my sig. And it says 12psi, but I think it was 11 at peak torque.

So I'm 10ft/lbs down and 15hp higher, with a 1.6.
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Old 08-25-2014, 12:56 PM   #65
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Quote:
Originally Posted by sixshooter View Post
That's obviously not a 2.25 downpipe and log manifold. And also not normal for a 2554.

Remember, the OP is unsure which t25 style turbo he has.

It's a 2.5" downpipe and a log manifold.

But i can see how that 0.25" could result in an extra 65hp. I stand corrected.
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Old 08-25-2014, 02:22 PM   #66
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My car made 160hp at less than 6psi on a stock exhaust with no intercooler on a very hot day...
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Old 08-25-2014, 02:24 PM   #67
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Well yeah sorry what I mean when i say it ran perfect is that it seemed perfect. I.e no misfiring or anything. Obviously I have no idea if det was happening all along.

The rev limit is set to 7.5k and it saw that a lot in n/a form and even a few times in the 4 days it ran with the turbo.

Here's pics of the head:





Quite sooted up.
Attached Thumbnails
Turbo installed. Lasted 4 days. Threw a rod.-496c60d6-fc23-426f-905c-00e5ad42b5d1.jpg   Turbo installed. Lasted 4 days. Threw a rod.-cbb88977-be14-4d38-89a5-82ddb38a9a4a.jpg  
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Old 08-25-2014, 02:27 PM   #68
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7.5k on a boosted motor and only 160hp? ouch.

That redline probably had something to do with it.
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Old 08-25-2014, 02:28 PM   #69
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Quote:
Originally Posted by triple88a View Post
7.5k on a boosted motor and only 160hp? ouch.

That redline probably had something to do with it.
Yeah as I said I was disappointed with the numbers
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Old 08-25-2014, 02:30 PM   #70
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is that pitting on the head or just drops of coolant?
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Old 08-25-2014, 02:32 PM   #71
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Post the timing map.
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Old 08-25-2014, 02:32 PM   #72
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Rain probably. It was raining when I removed it.

As i said. I can't post any mapping or anything ecu related until I've got it off my mapper. I was hoping that just by looking at the parts someone could tell what's happened but obviously that's hard after just 4 days use.
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Old 08-25-2014, 02:34 PM   #73
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I had my rev limiter set to 7100 and it didn't need to go that high because the meat of the powerband was below there with a log manifold and stock heads. And I hated to push it too hard because I wanted it to last.
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Old 08-25-2014, 02:35 PM   #74
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Quote:
Originally Posted by triple88a View Post
Post the timing map.
Read the thread, lol.
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Old 08-25-2014, 02:36 PM   #75
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are you sure?

look at at the edge of the combustion chamber, see how #3 is smooth and #4 looks like it has chips in it?

or am I seeing things?
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Old 08-25-2014, 02:40 PM   #76
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I see it too, but hard to tell considering the #4 piston came up and smacked it.
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Old 08-25-2014, 02:40 PM   #77
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Quote:
Originally Posted by sixshooter View Post
Read the thread, lol.
I am.. dont get why the op is saying he needs it from his mapper.. hook up the laptop and download it from the megasquirt...
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Old 08-25-2014, 02:43 PM   #78
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Quote:
Originally Posted by triple88a View Post
I am.. dont get why the op is saying he needs it from his mapper.. hook up the laptop and download it from the megasquirt...
As I said earlier. I don't have a laptop or even the software.
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Old 08-25-2014, 02:47 PM   #79
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Does your "mapper" send his emails by carrier pidgeons? Or telegraph?

I mean seriously, this takes all of 2 seconds. Phone call, "can I have my map and logs", email, voila....

Or, since you said he is "well known on here" I'm guessing you meant MT? In which case he can just post it up and the included logs from his tuning session.
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Old 08-25-2014, 02:50 PM   #80
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He's away at a festival all weekend. I'll try to get hold of him tomorrow
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