Turbo installed. Lasted 4 days. Threw a rod. - Page 2 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 08-24-2014, 12:16 PM   #21
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Quote:
Originally Posted by curly View Post
So sad. I've track on N/A car on a base map tune, and my turbo car multiple times. Zero rod lossage.

Did you set base timing before giving it to him?
I did and I'm 90% sure he checked it before he drove it off anyway.
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Old 08-24-2014, 12:29 PM   #22
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Quote:
Originally Posted by Horton View Post
Did you even read any if this?

I didn't tune it. My mapper (a well known good mapper who I will not name as I don't believe it's his fault) was picked up by me and driven to my garage to start the car and drive it back to his safely where it could be tuned in the hub dyno.
you, your mapper. semantics.

Quote:
My car was done right. Not a mega budget build but nothing was skimped on either. Mazda rods are not known to break at 181ftlb at all and it was mapped what I thought was safe.
clearly it was not done right. clearly the rods will break when it's not "mapped" safe. To make you feel better: my first turbo motor lasted about 15 minutes because I did stupid noob things.

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Pointing out retardation: you should have read the thread mate.
I dont need to read.

Can you post your tune? what are you on megasquirt?
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Old 08-24-2014, 12:33 PM   #23
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I'm on megasquirt yeah but I can't post my tune as I don't even have a lap top to plug it in or anything.
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Old 08-24-2014, 12:51 PM   #24
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So email your well known mapper and have him email you the files.
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Old 08-24-2014, 01:25 PM   #25
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Did you properly break in the motor? I have been told ( with my other fully rebuilt motors) to initially drive it hard ( a lot of deceleration in gear) with very little idling to help rings and bearings to seal properly. It has also been relayed that a fresh build also use dino oil first then change out after 100 miles then again at 2k-3k depending on amount of metal shavings. If that 3k miles was babied then I can see how a rod can be poking out of the block after a launch like that.
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Old 08-24-2014, 01:29 PM   #26
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Quote:
Originally Posted by Horton View Post
The car was only making 158bhp and 181ftlb at the wheels at 13psi
Wat...
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Old 08-24-2014, 01:30 PM   #27
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Our engines don't like as much spark angle as Hondas and Nissans because they are different engines in design. If the fellow doesn't do a lot of B-series Mazda engines, he should stick to the base tune's spark map that can be downloaded from DIYautotune and a few other places.

Out of curiosity, what RPM was it set for when you were using the launch control?
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Old 08-24-2014, 01:39 PM   #28
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OP, I feel like this thread is going to go nowhere until we actually get some proper info/pictures.

Your: "hai guyths, my car borked, it was done right and low power, wut happened?"

Us: "well, I'm guessing........and..........and.........and based on...........and according to what you said..........and"

We're just guessing. And making assumptions based on the very little actual info you provided.

We need to see the tune.
We need to see the carnage and close ups of affected parts (good pictures of spark plugs, piston tops, etc)

Only then will this discussion become truly productive.
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Old 08-24-2014, 01:53 PM   #29
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A 2554 or smaller with a small A/R turbine housing, a log manifold and tiny exhaust could conceivably create enough restriction to be that bad, but you'd really have to try.
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Old 08-24-2014, 02:28 PM   #30
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in for spark map and logs.

sorry to hear this OP, this type of thing pretty much never happens unless something was fubar'd on your end.

What injectors did you have? were they flow tested?
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Old 08-24-2014, 03:31 PM   #31
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Quote:
Originally Posted by 18psi View Post
OP, I feel like this thread is going to go nowhere until we actually get some proper info/pictures.

Your: "hai guyths, my car borked, it was done right and low power, wut happened?"

Us: "well, I'm guessing........and..........and.........and based on...........and according to what you said..........and"

We're just guessing. And making assumptions based on the very little actual info you provided.

We need to see the tune.
We need to see the carnage and close ups of affected parts (good pictures of spark plugs, piston tops, etc)

Only then will this discussion become truly productive.
I'll post some pics of the hole in a moment but that's all I have. I haven't removed the engine yet so no pics of pistons or anything. I did removed the plugs today and they all look perfect so I don't think the piston has contacted the head. As soon as I've removed the engine I'll take the sump off and take some pics.

Quote:
Originally Posted by Fireindc View Post
in for spark map and logs.

sorry to hear this OP, this type of thing pretty much never happens unless something was fubar'd on your end.

What injectors did you have? were they flow tested?
550cc ev14s they wee not flow tested as they were second hand but the plugs all look perfect so I reckon they were working fine.

Quote:
Originally Posted by mgeoffriau View Post
So email your well known mapper and have him email you the files.
I know he's away all weekend but I'll ask him when I speak to him

Quote:
Originally Posted by sixshooter View Post
Our engines don't like as much spark angle as Hondas and Nissans because they are different engines in design. If the fellow doesn't do a lot of B-series Mazda engines, he should stick to the base tune's spark map that can be downloaded from DIYautotune and a few other places.

Out of curiosity, what RPM was it set for when you were using the launch control?
He is a mx5 specialist. Well known on these forums that's why I trust it's not his tune.

Rpm was set to 4500 for launch control I think.

Quote:
Originally Posted by hmongmiatanb View Post
Did you properly break in the motor? I have been told ( with my other fully rebuilt motors) to initially drive it hard ( a lot of deceleration in gear) with very little idling to help rings and bearings to seal properly. It has also been relayed that a fresh build also use dino oil first then change out after 100 miles then again at 2k-3k depending on amount of metal shavings. If that 3k miles was babied then I can see how a rod can be poking out of the block after a launch like that.
Yep it was broken in correctly and worked perfect. Great compression and no oil usage.
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Old 08-24-2014, 03:37 PM   #32
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Turbo installed. Lasted 4 days. Threw a rod.-88e1239e-777e-4cd8-89fd-94c5e84bb496.jpg  
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Old 08-24-2014, 08:49 PM   #33
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Well, it could have been the engine assembly or maybe it got overevved at some point, but if it happened when you were using launch control that's probably the culprit.
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Old 08-24-2014, 09:37 PM   #34
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Originally Posted by Braineack View Post
you, your mapper. semantics.



clearly it was not done right. clearly the rods will break when it's not "mapped" safe. To make you feel better: my first turbo motor lasted about 15 minutes because I did stupid noob things.



I dont need to read.

Can you post your tune? what are you on megasquirt?
Super curious what you did to destroy a motor in 15min, Id like to keep from making the same mistake here in a month when I put my turbo setup on
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Old 08-24-2014, 09:46 PM   #35
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Horton, same engine as the one in this thread you made ?

https://www.miataturbo.net/general-m...rebuild-78604/

you ever solve the issue with cylinder 2 ?
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Old 08-24-2014, 09:46 PM   #36
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had timing advanced 16 form when I was n/a.
had 87 octane still in tank.
boosted 7psi.
only had a 12:1 FMU for more fuel, but no timing retardation.

Det to destruction; blew out ringlands on 2 pistons.
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Old 08-24-2014, 09:48 PM   #37
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Quote:
Originally Posted by Braineack View Post
had timing advanced 16 form when I was n/a.
had 87 octane still in tank.
boosted 7psi.
only had a 12:1 FMU for more fuel, but no timing retardation.

Det to destruction; blew out ringlands on 2 pistons.
surprised that your retardation didn't compensate for lack of timing retardation

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Old 08-24-2014, 09:50 PM   #38
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https://www.miataturbo.net/engine-pe...-rating-78590/

Quote:
My car runs a 40 thou skimmed head and about 20 degrees advance i think. It was mapped a while back and I've removed the plugs recently and they are white. A friend suggested that this means they are getting too hot and that I should change to a higher heat related plug?
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Old 08-25-2014, 06:27 AM   #39
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Quote:
Originally Posted by Gt2560rMiata View Post
Horton, same engine as the one in this thread you made ?

https://www.miataturbo.net/general-m...rebuild-78604/

you ever solve the issue with cylinder 2 ?
Yes mate same bottom end. The on heavily skimmed head as the issue on cylinder 2. Didn't smoke at all or burn and oil (hard to tell in 4 days tbh) with the new head and turbo fitted.

Also changed the plugs out for correct one suggested for turbo cars.

I had a big list or all the things I could think of that a turbo car needed and mine had everything expect a coolant re route. Which I have most of the parts for just haven't fitted it yet.
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Old 08-25-2014, 08:06 AM   #40
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Cool video by the way!
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