Author Topic: m42 supercharger (Read 18896 times)

axisofjustice · « **Reply #30 on:** August 08, 2012, 03:49:43 PM »

The sensors are not able to make up for running much boost, the narrowband o2 cannot richen the mixture appropriately. The chip you have is WORSE than no chip at all because it adds timing, which is the opposite that you want on a boosted car since more timing will increase the odds of detonation. The factory systems can only compensate for about 5psi.

I posted earlier on some tuning options, but as I said I am going to try simply adding a wideband o2, 22 or 24 lb/hr injectors, and BKR7E plugs (already installed). I will see what kind of air/fuel mixtures I see. Planning on having a somewhat rich idle with that setup, but that's ok for now. My s/c kit uses nothing but a rising rate FPR to support the boost fueling, but I do not have it because it was missing from my car when I acquired it. I will do what I just said, then if I am lean, I will add a vortech SFMU I have after I rebuild it.

ReSuL · « **Reply #31 on:** August 09, 2012, 12:53:27 AM »

so what would you recommend me for now since I couldnt afford all of them at the same time... the plugs are no problem since they are cheap but the injectors and wideband are expensive...

If my chip is worse than the stock one should I go on with stock?? and as I said earlier I can increase fuel on LPG?? is it a good idea to change the LPG injector nozzles with bigger ones not to run it lean at least??

axisofjustice · « **Reply #32 on:** August 09, 2012, 08:57:58 PM »

Yeah, if you can run a richer LPG a/f ratio go for it. Until you can afford all of it, get the plugs and a wideband, then you can drive the car with richer LPG mixture to be safe until proper tuning. The LC-1 from Innovate Motorsports is a competitive price and will double as a replacement for the factory o2. Plus, if you have a wideband and can adjust your fuel delivery (via LPG nozzles etc.) then you can get a baseline as stands. Go stock for the chip for now, last thing you need is more timing until you get a real tune.
Stoich with LPG is 15.7:1, you want to be much richer than that. Keep bumping fuel up until you get a WOT air/fuel ratio of no higher than 13:1 and you will be rich at low rpm, but safe. Only expense to running this rich with only baseline tuning is you will go through maintainance items faster such as plugs and oil.

ReSuL · « **Reply #33 on:** August 10, 2012, 05:32:22 AM »

thank you for all the information.. now I will start dealing with the pulley and other small issues first and try to buy an AFR as soon as possible..

the last thing I would like to ask is that what is the advantage of these BKR7E plugs for a boosted car??

axisofjustice · « **Reply #34 on:** August 10, 2012, 05:06:06 PM »

NGK V-power BKR7E are a colder heat range by one measure, which means less chance for detonation and proper combustion chamber temperatures, and since you will have a mixture that is richer for boost you will need to replace plugs more often and these are super cheap and high quality.

ReSuL · « **Reply #35 on:** August 13, 2012, 01:23:09 AM »

thank you for all the holy information you gave me until now.. I will share my project here when it is finished.. wish me luck friends..