timing on semi pp motor
#1
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timing on semi pp motor
i need some help on tunning a 13bre cosmo block which i semi pp ported
, im running a t72 the block has 9.4 rotors, i heard people running timing retard as much as 24 deg on leadings ,im using a locked distributor at 12 btdc on leading and 2 for trailing , the car pop so then i rearded the timing 15 btdc on leading and 5 trailing and cleared a bit more but still pop a lil bit, im runing 20 psi on manual boost controller this is on my 74 rx3
thanks julio
, im running a t72 the block has 9.4 rotors, i heard people running timing retard as much as 24 deg on leadings ,im using a locked distributor at 12 btdc on leading and 2 for trailing , the car pop so then i rearded the timing 15 btdc on leading and 5 trailing and cleared a bit more but still pop a lil bit, im runing 20 psi on manual boost controller this is on my 74 rx3
thanks julio
#2
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Put a wide band on it first an see what a/f ratios you're running . Excessive popping usually means that you're running rich. As for the timing , I dont mess with mechanical distributors , but I think 13-15 deg. @ 15psi and up is advance on the leading is "standard" on a turbo rotary.
#6
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Originally Posted by Marcel Burkett
Put a wide band on it first an see what a/f ratios you're running . Excessive popping usually means that you're running rich. As for the timing , I dont mess with mechanical distributors , but I think 13-15 deg. @ 15psi and up is advance on the leading is "standard" on a turbo rotary.
BTW - I am not saying you are wrong, just sharing my experience.
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#9
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big turbo + high compression + lots of overlap + pump gas = BOOM
i'd start really low...like maybe 10 and get it on the dyno and pay really close attention to egt's. how much boost?
i'd start really low...like maybe 10 and get it on the dyno and pay really close attention to egt's. how much boost?
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