Turbo installed. Lasted 4 days. Threw a rod. - Page 9 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 09-09-2014, 02:20 PM   #161
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Been on the dyno today.

Made more power and torque. Very happy with it now. A MASSIVE thanks to Dan at ardler automotive for checking the whole map over of me again.

Rev limit lowered to 7k

Hopefully it last more than 4 days this time.

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If any of you are on Instagram follow me on there for more pics

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Old 09-09-2014, 02:32 PM   #162
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That's...uh...a funny looking torque curve.
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Old 09-09-2014, 03:15 PM   #163
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Holy ****, it's just like looking out the window of my house (a mountain).
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Old 09-09-2014, 03:56 PM   #164
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not loading for me. i hate photobucket.
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Old 09-09-2014, 04:53 PM   #165
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So the car went on the dyno again today, it instantly made better power and needed work to the fuel map (especially in boost) to get it where it needs to be.

The strange torque curve comes from the same flaws in the original turbo setup where it just can't make the boost at the top end. It does however make for a lovely flat power graph at the top (I'd much rather have flat torque to redline but not many people run big enough turbos on stock engines). It's also emphasised by the way that the DynaPack auto-scales it's axis, which makes small changes look rather… large.

All in all - it's back on the road and the iMessage from Connor a short while ago that said "It's sooo much faster", it's amazing what an extra 20bhp can do :-)

Daniel
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Old 09-09-2014, 04:58 PM   #166
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It's nice to see the dyno runs start at a nice low RPM.
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Old 09-09-2014, 06:53 PM   #167
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With that torque curve you should have set the redline at 6000 rpm. He's got no business revving it out any higher than that with that clogged exhaust. All that it will do is make excess heat and cylinder pressure above there, and maybe cost him another engine.
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Old 09-09-2014, 07:39 PM   #168
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After seeing that dyno I would be concerned the cause of the original failure still lurks within the new motor. That type of torque fall off means you got one hell of a restriction somewhere. Restrictions like that cause cylinder temps to really skyrocket and lead to detonation.

I would pull the exhaust and dyno with just a downpipe and see if anything changes.
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Old 09-09-2014, 08:10 PM   #169
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Diesel swap?
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Old 09-09-2014, 09:37 PM   #170
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The cam timing is off. Im calling it. Im sure its been said before, but seriously, the mechanical timing is advanced a tooth somewhere.
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Old 09-09-2014, 09:43 PM   #171
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So...what PSI is that at?
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Old 09-09-2014, 10:18 PM   #172
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That's fucked. It's dropping torque worse than a stock msm.

It's gonna blow again.
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Old 09-10-2014, 11:03 AM   #173
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The exhaust really isn't very restrictive at all. The down pipe is the standard Hks on that's been chopped and made to be more free flowing but it does have a pretty sharp angle off the turbo so that must be a restriction I suppose.

Still at 13psi.

Cam timing is not off.

Torque really doesn't feel like it's dropping off that bad

I'm sure dan will answer with a more technical answer
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Old 09-10-2014, 11:10 AM   #174
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There is a problem. Look at all the dyno plots posted of our cars, none of of them look like yours.

None of them choke down like that. Even the ones with stock exhaust don't drop to 100tq @ redline
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Old 09-10-2014, 11:11 AM   #175
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omg, someone post the actual images here. photobucket never works for me.
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Old 09-10-2014, 11:12 AM   #176
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this is his torque curve: /\

literally drops from 200 too 100 by redline.
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Old 09-10-2014, 11:12 AM   #177
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Quote:
Originally Posted by Horton View Post
Torque really doesn't feel like it's dropping off that bad
It doesn't matter what it feels like when we have a graph. Graphs don't lie unless they come from Australia, so we know something is wrong.

Are you using a catalytic converter and stock muffler?
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Old 09-10-2014, 11:18 AM   #178
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Quote:
Originally Posted by 18psi View Post
this is his torque curve: /\

literally drops from 200 to 100 by redline.
I see it now; drops 80rwtq from 4K to 6.8K--I hope his boost at redline is 90kPa. That or I'm still sticking to my original theory: the tune.


I cant see how 150rwhp once it FINALLY spools to redline can feel good...

Typically when one makes 200rwtq, you'd expect at least 230rwhp. What turbo is this?

Last edited by Braineack; 09-10-2014 at 11:32 AM.
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Old 09-10-2014, 11:19 AM   #179
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No cat at all. Straight pipe from the turbo back to a single straight through box at the rear. All of it 2.5"
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Old 09-10-2014, 11:19 AM   #180
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Quote:
Originally Posted by 18psi View Post
this is his torque curve: /\

literally drops from 200 too 100 by redline.

It's making 10wtq more at redline than my motor did...


WHEN MY MOTOR WAS N/A.

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