Join Date: Nov 2005
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Well, I know the timing pin can be off as much as 2.5 degrees, thats how far mine was off. I had a pump shop pull the pump and run the piston to top dead center using a degree wheel on the crank then check the pin location. It was off 2.5 degrees.
Others have reported 1-2 degrees.
As far as timing, I'm at 22 degrees right now but that much advance can cause some smoke due to the spray angle of the injectors and the spray missing the oiston bowl and getting on the cylinder walls. Engine also sounds a little "harsh". I put in a set of Lenny's stage three's that have a steeper spray angle to keep the pattern in the piston bowl but that cost me some mileage. Helped with the smoke but hurt the mileage. I'm going to pull back to 18 degrees and go with a "standard" spray angle injector to see if the mileage will come back up. (the best thing I can do is quit "checking" my max boost in every day driving! LOL)
93 D250, PDR Twins HX35&HT3B, 60+# boost,PDR stage 2 head w/o-rings, PDR Cam, modified VE Pump, piston style lift pump, modified 5" intake w/AFE, ATS ported manifold,DTT 89% converter, 4" RIP exhaust, modified tranny, EGT/boost/tranny/tach gauges, TPS removed, a little chrome under the hood. Mag-Hitec tranny and diff. covers. Rear sway bar. Line-x bed liner, after market seats. Single stage Water/Meth system installed. Oversized intercooler w/3" IC lines.
05 Chevy 2500 HDcrew cab 4x4, Duramax W/Allison, 17" Hummer wheels w/285-70-17 BFG's, Banks intake, ported turbo mouthpiece. Predator programmer, Autometer EGT and boost gauges.