the old style TPI arent really digitaly controlled so you have a very narrow range of tuning on the MAF unit.. the later ones are speed density, which can be as acurate (and have less intake restriction) but to achieve the hich accuracy requires either tuning every engine individually.. or having a manufacturing practice that ecsures every engine is sufficiently alike to run the same program.... (or as GM did, have adapitve learning to "tune" the engine to the car)
so as to why the MAF-TPI is being ditched for the speed density TPI.. it allows you to run cams and such... and the computer that apparantly allows for most tuning is the one with the cold start injector.... the runners are to the best of my knowledge the same.. but if they arent.. that is an even better reason to run the cold start unit over the other
if you ar erunning a megasquirt, you will be lightyears ahead of all the OEM crap. and you need to focus on an intake with the best dry flow.. (forget what you know about carb intakes, and get one with long BIG runners) an accell super ram is a good bet, or the PP single plane and just mount a junk-yard/ebay throttle body from somthing like an LS1 or whatever you can find with a big blade, cable operation and a TPS.... all you require si a plate to adapt the two.. and that should not be a biggie to fabricate...
so as to why the MAF-TPI is being ditched for the speed density TPI.. it allows you to run cams and such... and the computer that apparantly allows for most tuning is the one with the cold start injector.... the runners are to the best of my knowledge the same.. but if they arent.. that is an even better reason to run the cold start unit over the other
if you ar erunning a megasquirt, you will be lightyears ahead of all the OEM crap. and you need to focus on an intake with the best dry flow.. (forget what you know about carb intakes, and get one with long BIG runners) an accell super ram is a good bet, or the PP single plane and just mount a junk-yard/ebay throttle body from somthing like an LS1 or whatever you can find with a big blade, cable operation and a TPS.... all you require si a plate to adapt the two.. and that should not be a biggie to fabricate...