Turbo installed. Lasted 4 days. Threw a rod. - Page 11 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 09-10-2014, 04:17 PM   #201
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Turbo installed. Lasted 4 days. Threw a rod.-5jnwqzy.jpg  
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Old 09-10-2014, 04:21 PM   #202
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it would actually be exaggerated over those, since it's probably 10-12% lower than a dynojet reading.

but what you really need to plot against is the torque; which would show how much it's spiking over the "norm" albiet those plots are from 2007-08
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Old 09-10-2014, 04:23 PM   #203
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That makes sense. I was wondering how it was making so many mad torques.

EDIT:
Brain, Do you know all the specifics of that old chart comparing the 3 turbos?
I saved it a while ago but didnt name it properly so I dont remember if its a B6 or BP, etc.
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Old 09-10-2014, 04:25 PM   #204
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How is the lowend THAT much stronger than other small turbo setups? Weren't there some questions about what turbo is actually on the car? Could it be something so tiny that it really is just choking out?

Last edited by pdexta; 09-10-2014 at 04:52 PM.
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Old 09-10-2014, 04:30 PM   #205
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He thinks its a 2554
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Old 09-10-2014, 04:54 PM   #206
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Old 09-10-2014, 05:03 PM   #207
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omg
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Old 09-10-2014, 05:13 PM   #208
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Now take the torque curve and boost curve and it all makes a lot more sense.

The car made noticeably less torque with a flat torque curve, and even with a "slight" hump didn't get near matching the figures it currently runs.

IAT's remained mid 40degrees at the end of a long pull too.
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Old 09-10-2014, 05:30 PM   #209
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So it drops from about 13psi at its peak down to about 7psi in the top end. That's quite a dropoff. I guess you aren't going to blow anything up at 7psi with a tiny turbo at the top of the rev range. That is a very unusual boost plot and is why everyone was worried as hell. If the boost curve had been 13psi to redline with that torque curve then you would have been in serious trouble, but as it is it is just an amusing quirk.
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Old 09-10-2014, 06:04 PM   #210
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It's still a good 50-60ftlbs under my car with a 2554 only doing 8psi at redline...

But if this is normal, then ok then.
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Old 09-10-2014, 06:15 PM   #211
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You have a '99 head IIRC, 3" exhaust, and perhaps more aggressive timing?
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Old 09-10-2014, 06:19 PM   #212
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Quote:
Originally Posted by turbofan View Post
You have a '99 head IIRC, 3" exhaust, and perhaps more aggressive timing?
2.5" downpipe, doubt the timing is more aggressive.

If this dude is losing that much from the exhaust, then it needs to be fixed, stat.
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Old 09-10-2014, 06:21 PM   #213
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... different dynos, different places/elevation/humidity?
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Old 09-10-2014, 06:29 PM   #214
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That would affect the whole curve, not cause an obscene drop like that.
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Old 09-10-2014, 06:35 PM   #215
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Truth.

Dis is jacked.
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Old 09-10-2014, 07:06 PM   #216
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This is why plotting tq/MAP vs RPM is useful. Alas, it doesn't seem like any dynos offer that as a display option.

--Ian
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Old 09-10-2014, 09:45 PM   #217
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Quote:
Originally Posted by concealer404 View Post
It's still a good 50-60ftlbs under my car with a 2554 only doing 8psi at redline...

But if this is normal, then ok then.
That is because his turbo is WAYYYYY out of it's efficiency islands even making 8 psi at 6800. If the OP turned the boost down to 5 psi peak, it would make what we consider a "normal" looking graph and peak around 150 WHP on a dynojet.

I think the designation for this turbo would be "T-to small". It looks like a TD03-9b or there about in size.

Keith
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Old 09-10-2014, 11:40 PM   #218
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Or maybe the IC has a terrible pressure drop and he's sourcing the wastegate signal before the IC.
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Old 09-10-2014, 11:47 PM   #219
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Quote:
Originally Posted by Twodoor View Post
That is because his turbo is WAYYYYY out of it's efficiency islands even making 8 psi at 6800. If the OP turned the boost down to 5 psi peak, it would make what we consider a "normal" looking graph and peak around 150 WHP on a dynojet.

I think the designation for this turbo would be "T-to small". It looks like a TD03-9b or there about in size.

Keith
if that was the case with 2554's, not only would all the plots we have for them look pretty much like that, but 1.8 owners and 99+ owners would see an even bigger drop

fortunately, that's not the case at all.
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Old 09-11-2014, 08:23 AM   #220
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Quote:
Originally Posted by pdexta View Post
How is the lowend THAT much stronger than other small turbo setups? Weren't there some questions about what turbo is actually on the car? Could it be something so tiny that it really is just choking out?
because a 15g and T3 Super 60 isn't a small turbo. The 2554 setup was a very mild, untuned, build as well.
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