Definitely sounds like tuning of timing or fuel here. When is your meth kit set to come on?

 

A couple people already got it.. I would say your fuel map needs adjusted when you start spraying meth, as meth is a additional fuel.

 

My meth start spraying on 0.8bar and gradual to full spray on 1.3 bar as my actual boost is 1.5bar.

Btw, will over rich cause misfire? I engine start to misfire when full boost til higher rpm (6000rpm).

Plug gapped 0.02"
Will the additional w/meth cause the af mixture harder to burn? im using the mid nozzle.

 

You can go as tight as .018.. I only use iridiums usually stock heat range. Could be spark blowout, but an over rich condition could cause that as well.

 

1. Your meth is probably flooding the system causing the extreme rich conditions at boost tip in...you need to lean this area out and lower timing for reduced knock and better spool up. Having a good fail safe is key, when to lean your tune out at that particular area you're basically telling the injectors go on break for a little bit the other guy(meth injection) has got it. If your meth kit fails to fire and inject the adequate fuel into your intake manifold and eventually cylinders then you may blow your motor.

2. I went a heat range colder when I started running meth and higher boost. From the stock 7 to 8's

3. Don't go too small on the gap, that can cause break up also if you don't have the spark to ignite the fuel. I use a Coil on pack, and .0019 is the lowest I have gone.

4. Too much fuel in your combustion process and not enough ignition timing will cause knock. With meth you can get away with quite a bit and potentially have a gift and a curse. The power is graat( with a good tune) but if your system is cheap an poorly maintained then you risk your motor.

5. Who tunes your car?

 

Hi Evoryder,
thank you for the great info's and im daring myself to play with the tune.
Hope someone can advise me on my map and log.

Will post it later as i worry i cant get the AFR log as my serial/usb port is faulty.