How to tell your turbo car is tuned too lean.

[M. Sage]

This is a pretty good sign right here:

Of course, if you let it get that bad, it's going to be way more expensive... The rod bearings were hammered, too. Took the pic a while ago, figured I'd share it here for your viewing pleasure.

For those who'll ask: 4G63 in an Eclipse. They're high end pistons, can't remember the brand. Don't know much more than that, since I'm not the one working on it.

 

[Dawico]

What am I supposed to be seeing? I see the big chip in the piston. Is that all?

The valve clearance grooves appear to be milled into the piston. Is that correct or are they made from contact with the valves (part of the damage)? It also looks a little burnt but that may be normal.

I guess I need a before picture.

 

[TxDad]

Oil and water mix so well...If thats what im seeing here

 

[96fordsix]

Yes, That lean is never good.

 

[fgarcia3441]

Those it look like pitting..our is that coolant mix with oil.. Seeing picture on phone

Sent from my SGH-T879 using Tapatalk 2

 

[TxDad]

And I see a hole in the piston. Ouch

 

[Das Jared]

Lemme guess. Got boost happy

sent from my dishwasher

 

[M. Sage]

What am I supposed to be seeing? I see the big chip in the piston. Is that all?

The valve clearance grooves appear to be milled into the piston. Is that correct or are they made from contact with the valves (part of the damage)? It also looks a little burnt but that may be normal.

I guess I need a before picture.

That "chip" is where the piston melted. The rings also melted, and it melted a divot out of the cylinder wall, too. Pull the other pistons out, all of them have ring grooves collapsed. Detonation is a bitch.

Those pistons are waaaayyyy too clean for an engine that has more than a few minutes on it. They should have a decent amount of carbon on them. The water is the unavoidable consequence of pulling the head off a water cooled engine that's been in service.

 

[granite]

hit the NOS too soon and you'll melt the welds on you're intake! Did I get that right? Fast n Furious

 

[M. Sage]

hit the NOS too soon and you'll melt the welds on you're intake! Did I get that right? Fast n Furious

ROFL, those movies are so ridiculous. I couldn't make it past that opening sequence where the passenger floorboard somehow fell off the DSM. WTF, man!? Also, there ain't a ton of skill involved in drag racing outside setting the vehicle up. Mostly it's a wallet-measuring exercise.

I did see the 5th one all the way through, though. I was too drunk to leave and it was on. I'm ashamed that I didn't just pound a few more drinks, stagger outside onto the lawn and die in my own vomit instead.

 

[SidewaysTA]

hit the NOS too soon and you'll melt the welds on you're intake! Did I get that right? Fast n Furious

No no, hitting the NAWSS too soon will just cause you to lose the race. Running that 5th stage of NAWSS is what will blow the welds on the intake...

 

[orbitup]

i did see the 5th one all the way through, though. I was too drunk to leave and it was on. I'm ashamed that i didn't just pound a few more drinks, stagger outside onto the lawn and die in my own vomit instead.

LMaO

 

[M. Sage]

Funny enough, nitrous could burn a hole in a piston like this, too.

Welds on the intake manifold is just so LOL-worthy.

 

[TheDan]

ROFL, those movies are so ridiculous.

I really hated the first movie, but once the other ones came out I learned to appreciate them in a new way. They are freak'n hilarious