Spun Bearing? Tune Feedback
2 Attachment(s)
Ok so quick background on the car:
1990 VVT swap China gt2871 GT500 injectors MS3X Full Kraken 3" exhaust Ok so I've had the motor swapped into the car for a year now and boosted it a little over a month ago. Mostly street driving with one autocross. On the way home last week the car developed knock. Pulled over immediately. Let it cool and took the valve cover off and everything looked to be correct as far as the valve train was concerned. Pulled the spark plugs and #3 had the electrode broken off. At this point I'm thinking spun bearing. Anyways, I don't have a lot of time to investigate exactly what happened right now. I've already sourced a new motor to drop in place but before I get this one into boost again I'd like some feedback on the tune I was running. I've attached the tune and a pull from a few weeks ago. I will be switching the to a GT2560r well when the new motor goes in. Any feedback is appreciated! https://scontent-mia3-2.xx.fbcdn.net...0f&oe=5DFC9786 https://scontent-mia3-2.xx.fbcdn.net...bb&oe=5E0B75F9 |
tune? who cares about the tune. What kind of boost were you running? You can't expect that little crappy motor to just magically handle a ton of boost without some engine work.
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Originally Posted by Mudflap
(Post 1548444)
tune? who cares about the tune. What kind of boost were you running? You can't expect that little crappy motor to just magically handle a ton of boost without some engine work.
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Knock can leak to a spun bearing. The missing spark plug electrode is a pretty good sign it was knocking. What heat range are the plugs?
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Originally Posted by Full_Tilt_Boogie
(Post 1548448)
Knock can leak to a spun bearing. The missing spark plug electrode is a pretty good sign it was knocking. What heat range are the plugs?
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Thread reads kinda misleading to me, considering I know the actually use of your car. You have done how many autox on the VVT swap, many runs and you are a pretty aggressive driver. You also mentioned it was starting to develop a tick or something leading up to the failure that you never figured out.
Then you did the 1 autox boosted, correct? |
Originally Posted by oregonmon
(Post 1548498)
Thread reads kinda misleading to me, considering I know the actually use of your car. You have done how many autox on the VVT swap, many runs and you are a pretty aggressive driver. You also mentioned it was starting to develop a tick or something leading up to the failure that you never figured out.
Then you did the 1 autox boosted, correct? The main change in my tune from NA to FI was the addition of the positive pressure rows of the fuel, ignition, and AFR tables. Everything below 100KPa was essentially what it was before I went FI. So if there is something glaringly wrong with the NA part of my tune now, there was something glaringly wrong about my tune before FI. |
10.5 psi on a 2871 could have been around 250 some tq, with det, that's bad.
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Originally Posted by Cutthroat912
(Post 1548454)
They're BKR5E'S
I cant say anything definitive, but your hot plugs could be what killed your engine. |
Originally Posted by Full_Tilt_Boogie
(Post 1548506)
Thats not a cold enough plug for boost. You should be running a 7, not a 5.
I cant say anything definitive, but your hot plugs could be what killed your engine. |
I would reduce your whole afr table by .5 and maybe by 1 in the idle area.
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