ok heres the story…a couple buddies and i were discussing this and could not come up with a genuine answer…heres the debate.
i have a v8 equiped vehicle
the v8 i have is a maf car and has a one piece single throttle body intake manifold design feeding both banks of cylinders. (like lsx cars)
if a dual intake system was in mind (single plenum for each bank/dual tb) could the car run on the stock ecu or need to be run on a standalone system (mega/aem).
could the stock ecu recept tps signal from only one throttle body while the other just remained unplugged??
the ecu would see maf regardless and still produce adiquite amounts of fuel/timing/ign…whatever the ecu sees from the 1tb it should share with the otherside of the motor equally…
thats my thought…
yes i relize the throttle bodies need to be synched and be flowing equal amounts of air and i know the stock tune would most likely be shit but any help on this pam, pand dilemma would be fantastic.
I think you kind of answered your own question here.
IMHO it’ll run. From the sound of it you’re not talking about anything to modern as well. An older 4 stoke gas engine doesn’t need all that much to run. Air, fuel compression, spark. it’s all there.
im almost postive this will work…and run as good as stock is not better.
just wanna make sure in the event dual plenums would be in question…
but thanks for your input
one maf on one side = metered air for 1 side. this would mean that the ecu will fuel for only half of the air the motor will be seeing. you would need to rescale the mafs or something like that. proper way would be to have both mafs functional.
so now you wanna restrict the dual plenum setup with a single maf? you pretty much just made a single plenum design again, but only with 2 plenums. I dont see how this would help out or be a positive.
well the maf is pretty stright forward…nothing restrictive.
the result of this would be to get rid of the ugly fucking stock manifold and to change throttle body location to free up tons of room for an intake pipe, filter and maf.
plus the stock intake mani is cast and full of crater/dimples/casting marks inside…the new manis would be aluminum and blinging foo
I currently only have 1 MAF even though I’m running 2 independent intakes to each bank. However, the car wound NOT run well enough to drive if the MAF values were not doubled on my ECU to compensate for the flow of twice as much air. You’re going to need to tune for it somehow if you want to stick with 1 MAF.
There are some Z guys who run dual MAFs (one on each bank) and there is a translator unit that allows us to switch to a dual intake design without having to tune anything. Before this translator was out guys would just wire in dual MAFs and use an SAFC or comparable unit to tune for it.
Just remember that when you design your own intake manifold, especially for NA, you’re probably going to screw it up. There’s a whole lot of complex math that goes into an intake manifold (not just a simple Helmholtz calculation) and it’s unlikely that you’ll improve over stock.
i figured some sort of solution was out for this common swap…thanks josh.
i have to look into it…
but why would there be twice as much air flow? if both plenums equaled the same volume as the stock then it would still be using the same amount of air…
ive also thought about this…if the car was being boosted id have no second thoughts but i know how important a proper design is for na apps.
ill have to do alittle research
The MAF will only be seeing the air flowing through it. While the motor might still get the same volume of air, if you have 2 individual plenums (1 metered, the other not metered) and they’re devorced from eachother, the MAF is only going to read half of that original volume. The actual volume of air entering the motor is double (twice as much as) the volume passing through the MAF.
well i know if i did somehting like that on an LSX based vehicle i would simply tune for speed density and screw the maf. ITB’s are not uncommon on lsx motors.
i believe you are correct sir. i haven’t researched it much. i do like the idea and all of it but not the price tag associated with it. Otherwise the 30th would have ITB’s.
If you string vacuum lines to each TB and to a common vac manifold, it should be possible to run a MAP sensor on it. I’ve heard it’s no fun to tune at all which is why alpha-n is the way to go.
sorry jay.
