Join Date: Jan 2000
Location: Manassas, VA, USA
A chip can adjust timing based on several parameters like throttle position, load, WOT, part throttle etc. It's much more flexible. A BTM pulls timing based soley on boost. With KB blowers I can make from zero to full boost from 2,000 rpm to redline and it can happen under differing loads, throttle positions etc. I don't need the same timing retard at part throttle as I do under WOT. While a BLM will get the job done IMO it just doesn't have the finess that is needed to make a car pleasant to drive under all conditions. The centrifugal can use a BTM with less penalty because they only need to tune for boost in a 1,500-2,000 rpm range and most of the time it is for WOT conditions.
'89 LX 5.0L, T-56; SVO Ceramic Shorties; Ultraflow Cat-Back; 1.7 SVO Rockers; Pro-M 75mm MAF; 42# injectors; 75mm Throttle Body/EGR; 3.55 FMS Gears; GT40-X heads (64cc/ported); #2031 Cam; 12 psi Kenne Bell 2200 w/ Flowzilla; SMC W/A Injection; J&S Timing Controller; TwEECer RT; DIY-WB