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Old 07-03-2008, 03:36 PM   #1
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Default I overspooled my turbo, can I run at zero boost?

Like the title says, I learned what overspool is the hard way, my radial bearings are fried since I've been breaking in and testing the rebuilt motor w/ the turbo venting to atmosphere and all exhaust flow going to turbo. It took ~60miles. :(

I don't have megasquirt running yet, and want to run "safely" at zero boost since I assume that the stock computer won't deal w/ boost.

So, I'm rebuilding the turbo again, once that's done will it be safe to run with:
-Wastegate spring taken out (Tial external wastegate)
-Turbo (TD05 16G) lines and tubes all connected (oil, water, compressor, turbine)
-Stock air filter, MAF sensor, and IAT bolted to inlet of compressor
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Old 07-03-2008, 03:54 PM   #2
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it might be easier to pull the turbo out of the tubine housing and bolt a block off plate there instead.

otherwise the turbo, even can still make a few pounds of boost.

also, you've idled and drawn vacuum out of the motor....it's broken in.
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Old 07-03-2008, 03:57 PM   #3
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Damn brain too fast for me. What he said^
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Old 07-03-2008, 04:09 PM   #4
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Old 07-03-2008, 04:26 PM   #5
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wiggity what? people run like that?

this is why I keep a spare 4-into-1 header in the garage. oh, wait. i have no garage :(
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Old 07-03-2008, 04:28 PM   #6
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m2cupcar-NA intercooled, half turbo miata, noice
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Old 07-03-2008, 04:39 PM   #7
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First....there was the interfooler now this.
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Old 07-03-2008, 05:12 PM   #8
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I did when my turbine blade came apart. It wasn't too bad like that (OE rated ~145chp/ftlbs.) - a little weak on the top end... choke, choke, choke.
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Old 07-03-2008, 05:37 PM   #9
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Quote:
Originally Posted by Duckie_uk View Post
Damn brain too fast for me. What he said^
Anyone know if the stock ECU can handle a couple psi? The MAF is on the inlet side of the compressor and I have a huge *** intercooler.

Isn't the worst case that AIT is higher than the the ECU reads (since it's before the compressor) and adds a bit too much fuel?
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Old 07-03-2008, 06:15 PM   #10
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I assume you have a WBO2 meter if you have a turbo, connected or not. Keep an eye on the AFR if it leans out because you develop boost then ease off and stop.
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Old 07-03-2008, 07:12 PM   #11
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Quote:
Originally Posted by Duckie_uk View Post
I assume you have a WBO2 meter if you have a turbo, connected or not. Keep an eye on the AFR if it leans out because you develop boost then ease off and stop.
Ok, I'll do that. What's AFR is too lean?
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Old 07-03-2008, 07:31 PM   #12
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Quote:
Originally Posted by fluke View Post
Ok, I'll do that. What's AFR is too lean?
I would think as long as you stay under 13 with just a few pounds you will be fine.
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