Sup guys, just got my LSV-T hatch back on the road went and got it tuned 2 weeks ago on 12psi put down right at 300hp to break it in. Well cars been running great. I went out to play in it Friday night and now the car runs fine except when I get to 8psi+ of boost the car starts breaking up bad. ive checked plugs(they were nasty so I changed them didn't change the way the car felt at all) vacuum lines ect ect went over the basics. any ideas will be appreciated setup on the car is:
LS block
css
cp 9:1
eagles
supertech vavletrain in b16 head
go autoworks turbo kit
Neptune
880s
hks evcs

 

What was your spark plug gap on the old plugs?

Chances are you didnt gap your plugs right, and the gap is too large for the spark to jump in boost.


The denser the air inside the combustion chamber, the more molecules are in the way of the electricity trying to jump the air gap at the spark plug tip. How can you make it easier for the spark to make the jump? Make the jump smaller.

So pull the plugs, gap them down a bit. Chances are they are at .044" if they are -11 plugs or .032" if they are standard gap plugs. Gap down to ohh lets say .025" and test, and see how it goes. Still getting ignition issues? Try .020".

Good luck.

 

the old plugs were .25 and gapped all these to .25 even pulled them out and rechecked just to make sure. u think I should try goin to .2? it really feel like ignition

 

Check you cap, rotor, and plug wires. I bet its one of those three things.

 

On my old turbo gsr setup I had the same problem. I replaced the cap and rotor with new OEM parts and it fixed all my issues. If you ignition system is stock make sure you only use OEM components. Parts store ignition stuff is junk.

 

Blowing spark out. Video would help, return to tuner and let him diag it with you. You're only going to get so much help on a forum without more info.

 

Lost compression on cylinder #2 jus got it apart cracked ringlands after 700 miles thanks for the help guys

 

Damn! Sorry to hear that man. Good luck with the rebuild. Come back stronger and faster.

 

You cracked the ring lands on the CP's?

 

X2 only seen on stock pistons.

Something must be really wrong.

 

how on earth could you crack ring lands on forged pistons at 300whp?

 

On my first ever turbo setup I cracked a sleeve wide open at only 330whp do to a shitty *** tuner running a stock map sensor at 12+lbs of boost. Op you need to figure out what when wrong to cause that kind of damage at such a low power level.

 

I had crappy plug wires get me before with misfiring with higher boost levels. 7 lbs would be fine and never break up, but once I increased beyond that it would misfire. Something easy to check and fix. This also happened after I got my car tuned as well. Hopefully this is will help!

 

Bent Rod was cause of pistion cracking I got so caught up n the.ringlamds.beimg.cracked.I failed.to realize.the.rod.was smashed and.bent.like.it.had.hit.something I bought the motor assembled.from a.guy with all kinda people.vouching.for.his.work lesson learned tho if.its.to good.of.a.deal it.usually.is

 

Took me 10 mins to read that with all the periods lol.

That sucks man I learned that lesson the hard way too. I don't trust what anyone says, I check it all over myself.

 

Post a pic of the damaged cp piston bro. I wanna see it if you can

 

Sorry to hear....I would like to see pics as well of it all