lt1, p600b, 11 psi boost, meth inj. what timing should I be at?
Hi,
I have a 93 lt1, p600b w/ 11psi stock bottom end, hot cam / ported stock heads / LT headers, 50/50 meth injection, 60 lb injectors, racetronix walbro 255 l/hr pump. AS&M monoblade TB. I try to keep my AFR around 11.0 to 11.5:1. I do have a wideband hooked to my drivers side exhaust bank (most likely to go lean from what I understand). My boost curve hits like this: 3000 RPM: 5 psi 4000 RPM: 7.5 psi 5000 RPM: 10 psi 6000 RPM :12 psi (though I will only hit this in cold weather, I set my rev limited around 5600 rpm top prevent reaching this in hot weather) My WOT spark advance goes like this: 2800: 31 degrees 3200: 31 degrees 3600: 27 degrees 4000: 23 degress 4500: 21 degrees 5000: 20 degrees 5500: 20 degrees Im using tunerpro RT to tune and have spark advance going from 30 degrees (at 3000 RPM) down to 20 degrees at 4800 RPM. This worked well in 95F friday on a heat soaked engine. Datalogs did not indicate any knock or any timing being pulled due to heat (note I have relocated my air inlet temp sensor to an ambient air source vs. the blower discharge pipe.) Should I chance it and add a couple more degrees of timing? Or am I kind of pushing it? |
Re: lt1, p600b, 11 psi boost, meth inj. what timing should I be at?
that timing looks decent, don' t get too aggressive on the timing with the stock bottom end.
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