i have a b20 vtec fully build and when i start making full boost it seems like it wants to break up.what can i do to fix it

 

Need to know your setup, if your tuned, afr at wot, what spark plugs and the gap just to name a few.

 

1. Has your car been properly tuned?
2. Do you have a wideband oxygen sensor gauge? If so what are your air fuel ratio at wide open throttle?

 

Yeah almost always ignition related. Either spark plug gap, or lean misfiring. Hopefully just the former. Gap no wider than 0.028" if 15psi or more.

 

Wow diagnosing with no info... your good

 

Just trying to help point in the right direction.

What did you just contribute?

Geez.... Dick.

 

not tuned i know i need it ngk plugs dont know what kind of ngk but pushing 8 psi and i set my plugs at 45 no wide band

 

problem solved...get it tuned...if its a fully built B20V i wouldnt screw around with it un-tuned thats just dumb unless you like to throw money away

 

Do NOT go into boost any further with your car until you can get it dyno tuned. Depending on what kind of power you're shooting for, your tuner will gap your plugs accordingly. .045" is too big of a gap, anyway.

What is your power goal? This will determine the heat range of your plug. For example, I ran NGK BKR7E (heat range-7) plugs with the old car (304 whp), gapped at .026". I run NGK R5671-8A (heat range-8) in the new car (445 whp), gapped at .028". Every setup is different, but just giving you a ball park range.

Talk with your tuner, and he'll choose a plug for you, based on your power goal. In the mean time, find out what NGK plugs you have in there now.

 

That is your problem

 

how many degrees do i need to retard it

 

Start by changing plugs and yapping lower and get it tuned.

 

you don't need to retard anything. you need to get it tuned and your tuner will set your ignition timing.

 

Re-read posts #9, 10 & 13, man.

 

I don't think he gets it, what state are you located in and we can point you to a good tuner!