Re: Why is the secondary injector circuit so complicated?
Quote:
Originally Posted by XfireZ51
Basically, GM didn?t want to or could not develop another ECM for a limited run of units like the ZR-1. There are many similarities between the L98 programming and the LT5, although the LT5 uses Speed Density instead of MAF for some obvious reasons, ie a new MAF would have been required. Controlling the secondaries using the ECM would have required additional injector drivers, again necessitating a significantly modified or new ECM. So the injector relays are a less expensive alternative while using the primary injector as simply the ?trigger?. Then u cut the PW by 50% whenever the secondaries are engaged. Voila!
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Well put! 
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90 #1202
"FBI" top end ported & relieved
Cam timing by "Pete the Greek"
Sans secondaries
Chip & dyno tuning by Haibeck Automotive
SW headers, X-pipe, MF muffs
Former Secretary, ZR-1 Net Registry
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