99huggerorangeZ

what years were tuned port injection mass air flow??

85-89???

BlowBye

yes

94z'sson

why do you want to get rid of the mass air flow sensor on a car

ICEmanZ

yeah, 85-89

TwinTurboROC

as far as it goes the mass air flow cars are better for the not technical owners but if u know ur prom tuning or wanna get into it a speed density system is the best way to go... and the later 3rd gens 90-92 can produce ALOT more power just w/ prom tuning... but you got to know what ur doing to get he most out of em... mass air flow is a great system but the only problem with the 3rd gens are the computers... i think its based of of an 8 bit system (correct me if im wrong here) so even though our mas air flow meters can read someting like 255/gms (once again correct me if im wrong... im sure im wrong on the number) the computer cannot read the full flow of the mass air flow... lt1 and ls1 and stangs have computers that can read their mass air flow...

but overall speed density is better... i believe most DFI systems are sd (not a dfi expert yet)

94z'sson

well now you know why i have a LT1 in my car cuz the computer is way better can you tell us more about your twin turbo IROC? please

TwinTurboROC

sorry dude no turbos....

irocz8957

yeah 85-89 after that is was all speed density

Jim85IROC

If your motor uses enough air to go beyond the capabilities of the 255 g/s limitations, then SD is definately the way to go. If it doesn't, you really have no benefit by using SD, and because SD is less capable of adapting, you're going to spend more time tuning the PROM to get it good.

Most DFI systems can work with a SD or MAF type of arrangement, but because there are so many different MAF systems out there, I doubt that the DFI systems are compatable with all of them. Plus, if somebody is building a system from the ground up anyway, why spend the money for the MAF & complicate plumbing when you can accomplish it with SD?

Overall, MAF setups are more forgiving and adaptable, which is why the LS1s and all other current EFI vehicles use a MAF setup. If the new car manufacturers wanted to custom taylor each and every car with custom programming, the SD setup could probably work just as well, but since no two cars off the line are 100.0% identical, the adaptability of the MAF setup helps them all come a lot closer. Unfortunately, the TPI MAF systems do have a severe limitation, and once your car flows enough air to exceed that limitation, SD or an aftermarket DFI MAF setup are your only options.

99huggerorangeZ

i am thinking of building another 383 but this time its going to be a tpi 383 but i am wondering if i will be able to attain 500hp?? and also which would be better mass air flow or speed density??

aklim

At that level, you are going to need EPROM tuning so speed density would not be a problem.

TwinTurboROC

if ur using a tpi to attain anyhwere above 400 or above hp at the crank it aint gonna happen.... tpi has severe flow limitations at higher hp application... torque #'s are a different story.... if u wanna go fi use a holley stealth ram or tpis mini ram.... im a big fan of teh stealth ram.... and yes all the customing tuning is gonna be needed...bla bla bla.... not saying that tpi sucks i have seen a couple of 383 blown motors w 550+ at the crank... but changing over to a different manifold will give you alot more hp...