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mercedestech · 05-25-2013, 07:32 PM

Just thought I would add this into the mix: I have had a 3.85 inch pulley sitting here for over a month that I hadn't installed. Based on the earlier discussion of my AFR indicating 11, but really being 10.5 I decided to install it today. Changed out the TR6 plugs to ZR1 plugs and installed the pulley. Took it extremely easy watching A/F ratio like a hawk. Too my surprise, I am still indicating 11-11.2 AFR with the smaller pulley. I haven't logged it yet to see what boost I'm hitting, but with the 4 inch pulley I was at 7.5. The pulley should be good for 1.5psi to put me back up to 9 (where the stock 4 inch pulley was before headers/cam). I find it hard to beleive that adding 1.5 pounds of boost seems to be working ok with the tune for 7.5. (atleast as far as A/F is concerned). I want to log K/R before I run it really hard with the new pulley. But so far so good

To the OP, I hope my discussion is relevant enough to the original topic..if not, my apologies.

05-25-2013, 07:32 PM	#12
mercedestech Drives: 2010 2SS/RS IOM,2013 Mercedes ML350 Join Date: May 2010 Location: Akron Posts: 507	Just thought I would add this into the mix: I have had a 3.85 inch pulley sitting here for over a month that I hadn't installed. Based on the earlier discussion of my AFR indicating 11, but really being 10.5 I decided to install it today. Changed out the TR6 plugs to ZR1 plugs and installed the pulley. Took it extremely easy watching A/F ratio like a hawk. Too my surprise, I am still indicating 11-11.2 AFR with the smaller pulley. I haven't logged it yet to see what boost I'm hitting, but with the 4 inch pulley I was at 7.5. The pulley should be good for 1.5psi to put me back up to 9 (where the stock 4 inch pulley was before headers/cam). I find it hard to beleive that adding 1.5 pounds of boost seems to be working ok with the tune for 7.5. (atleast as far as A/F is concerned). I want to log K/R before I run it really hard with the new pulley. But so far so good To the OP, I hope my discussion is relevant enough to the original topic..if not, my apologies. __________________ 2010 Camaro 2SS/RS Whipple 2.9L, Rotofab CAI and coil covers, XS Power LT's and full 3" exhaust, Vengeance kaotic cam package (trunion kit,dual springs,titanium retainers,hardened pushrods,c5r chain,ls2 tensioner, melling oil pump) Mgw shifter, 160 deg Tstat, prosport gauges, LPE dual pump, FIC 60lb injectors, level 5 DSS Axles 1994 Z28 MSD optispark, K&N CAI, Magnaflow y pipe..Cat..and cat back. 1998 wheels, custom tune(sold ) 1993 Base V6 sold to buy Z28 1994 Purple Pearl V6...sold 1979 Base Car with inline 250ci 6 cyl! My first car in 1989!