Just installed p-600b procharger, Sent computer to PCM (awesome job) Took car for first ride, she Idles great, no leaks etc... Got on it slightly and she pulled great!! Tried again and when I reved above 4,000 she poped and backfired. Any ideas. Computer maybe???? Also did you guys change your plugs with supercharger??? I have new plugs in there about 7,000 miles ago

 

What kind of plugs and what plug gap did you set them to? Did they pull timing out of the tune for your boosted setup?

Ken R.

 

Dont remember the gapping but they are NGK TR-55 Vpower plugs If that helps!!

 

most of us with boost run a closer plug gap. I have read anywhere from .030 to .045 If you can log data, take a look at the fuel pressure. Are you running a bigger fuel pump?

 

Stock pump, running the supplied pump from procharger. Think I should change pump.

 

nope. But high rpm detonation will kill your motor, so find out what you are lacking soon. Either fuel or spark IMO. Don't be discouraged. These combos can take some sorting out before the fun begins. If you want to throw some money at the problem blindly, I would recommend you change to TR6 plugs gapped at .040 and replace the fuel filter. Did you check and make sure the additional pump is coming on at boost?

 

Thanks badge!! I haven't hooked up my fuel gauge yet. Doing it this week don't really want to drive w/o one. Just did my vac/boost gauge. How can I check if its coming on at boost??? I can hear the pump go on when I put the key in accessory position. I would rather it be a computer issue being that its MUCH easier to take comp out than do a plug change with Long tubes!! Thanks for your help!!

 

It would be a good idea to have FP gauge working along with proper plugs and gaping. It's a big investment you dont want to shoot your load premature.. With boost things that may seem silly can be very important. Good luck working the bugs out..


TAKE YOUR TIME BEFORE BEATING IT!


Bill

 

If thats an inline pump, then it should be pumping all the time and not boost activated. As stated above, a TR6 with a gap in the .035 to .040 range is probably your best bet. You'll want a little cooler plug in there with a tighter gap. The TR6 setup will get you that. And yes, like the other guys said, a FP gauge. You don't want your FP dropping off in boost. Do you have an FMU setup to get you more fuel, or was it added in your tune? If you have no FMU and no fuel was added in your tune for boost, and your on your stock FP regulator, then your most likely leaning out under boost. That is a VERY bad thing. A wideband or some dyno time is a good thing initally, so you might want to consider one of those options. Your really want to see whats going on first before really getting on it, or bad things will happen. Keep us posted.

Ken R.

 

If you're running an FMU, the fuel pressure should spike up to around 80-90lbs. when hitting boost. By the way, I wouldn't recommend running the stock injectors. They can lock up under high fuel pressures. If your tune is intended for the stock 24 lb injectors (with FMU), swap them out for 24lb SVOs. They're a different style that's not prone to lockup.

 

Not running FMU, I do have 42lb INJ, tune setup for those. What is norm press for WOT boost and also at idle??

 

I prefer autolite 103's gapped at .035