Did you have the engine tuned after you put the 6# pulley on?

 

Thats one thing to consider, but also, a stock bottom (mostly pistons/rings) can't handle 6psi or more for very long, especially if you were beatin on the thing and constantly under boost from what ive gathered. Thats the main reason i havent bolted the unit on my stock bottom engine yet. I hear the ring lands take a **** after about 5psi on the stock pistons. Not having it tuned properly and running it lean would surely lead her to an early grave. It seems to be the common situation no matter what s/c yer using, but 5-6 psi on a stock engine seems to be the limit of the internals. Non-intercooled that is. Any anybody running more than 5-6psi on a stock bottom with an intercooler or alcy injection?

 

That was gonna be next. I was running the Crane HI6TR with cockpit adjustable timing control. It would pull timing based on boost levels. Sometimes 1 degree per lb/boost or sometimes a few degrees.
I believe what killed the motor was that my knock sensor went bad. Some days I would get a ton of KR and other days I would get zero no matter what. My PCM not pulling timing when it should have.

 

Im running just over 7 psi on my d1sc with twin highflow intercoolers. Havent had any problems, but i did go pretty condervative with the tune. Overall about 3 degrees retard, and a/f ratio on the rich side...About 12:1-12.2:1 at WOT at 5k.

 

Cool, how long she been running? Any dyno #'s on it or track times? Where do you mount intercoolers on an f-body anyways? You wouldnt happen to have any pics of your setup would ya?

 

I would think as long as you pulled the timing enough, it would keep the temperatures just low enough to prevent detonation. but then at what point do you pull too much out and your engine/power suffers from that also. then you also have to take into to consideration that if its a real hot day, that could also aid in blowing your engine if its right on the edge anyway.

Ultimately, I'll probably stick with the 4.5 pulley because that should get me right around 400 rwhp with my mild street setup.

I'm curious if anyone who did a mild blower setup..went back to the stock compression..but just got forged pistons. So stock crank, rods, compression, but forged pistons. I wonder how much psi that motor could hold? because then your not giving up any compression hp as a trade off.

 

eek...was there anything specific about the day that you think was causing the KR? hot day? alot of driving/racing? thats pretty weird if it was just randomly happening..wonder if you were so close to the line anyway..that maybe it was just the atmopsheric pressure.

 

Car runs great! ive only had the kit on for about 1000 miles, but i see no detonation. I dont have any numbers because i got a mail order tune instead of dyno tune, and i will be going to the track once my 12 bolt gets installed. The twin intercoolers on ls1's and lt1's mount in front on the front fender wells. I will try to get out and take some pics when I get some free time.