Who has done it. What were the pros and cons and what was low speed drivability like? I'm trying to see if i can avoid getting a selin translator as for my build I don't think dual afms are needed at all as I don't beleive I will get near the quoted 500-550hp that apparently is the max of a single afm? Cheers, Adam
Get rid of the restrictive Y pipe and put 2 90degree silicon elbows, one with AFM and other with a dummy or a bit of pipe to keep intake lengths equal. There is then a function in nistune to adjust the voltage from the afm to make it understand that there is twice the amount of air going into the engine as to what the AFM is saying. There are also "low speed drivability" kits which basically just connects after the afm to to equal out the airflow to both cylinder banks. I am just after some first hand knowledge and experience of people who have done dual intake setups using nistune and without a selin translator.
Does this achieve the same result Mike? Selin only averages the values of both AFM values/readings so why do people spend an extra $350 + extra AFM. Only reason I can think of is because its a direct plug n play, though it would have almost zero benefit on a standard TT and anyone running some more boost usually has other mods and a new tune. I already have an extra AFM and nistune... only need to buy the Selin kit, so I can achieve the same result without Selin?
I have a 2nd afm as my dummy afm, so all I need is the selin unit also. Im not sure id see much off a difference really. Im not sure exactly what thebenefit of the selin is tbh. My setup drives fine but the dools IS effectively the low speed drivability mod as the intakes are merged (as opposed to the 2x90deg elbows). Edit: to answer your question Adam, I can't justify the money for the selin as I haven't been convinced by anyone thats it is superior.
My only concern is low speed drivability. I am going to fit the GB dual intake with 1 AFM and an extra piece of pipe on the side without the AFM to make the intakes equal length as its cheaper than getting a dummy AFM. Then just adjust the value in nistune. Will see how it goes, if I have issues I will get my mate who owns/runs an exhaust shop to fab me up a custom intake. I have a doolz copy from PZP but it won't fit well with my FMIC.
Or you could just get 2 AFM's with 2 Air Intakes and use the Selin kit, did this and 0 low speed driveability issues. The power is there (was a dyno done before and after) and 0 issues, and havn't heard anyone getting issues with doing it this way, only when they try to do 1 AFM or a dummy AFM instead.
You're kinda missing the point of the thread mate. I want to know who has done dual intake with 1 AFM and nistune. I am fully aware of the selin option as you would know if you read the whole thread! Thanks for your input though. It is good to know another with zero low speed issues with the selin. I am just seeing if there is another option to the magical selin translator setup which costs over $500 and doesn't do a whole lot other than add 2 values.. @Zedboy. Low speed drivability issues have been experienced by some people with certain dual intake setups, jerky and rough and doesnt like going slow I believe is the issue.
Iacv takes its reading from drivers side which isn't an issue with doolz or stock intake. A split twin intake is the only setup that MAY have low speed drivability issues. I fail to see how selin's a+b/2 is superrior to nistune's a/2*2. Ecu still only gets 1input. Even the add function, the only benefit would be that it is actually metering all the incomming air.
I dont have any pics atm but ill take some when im home next. It all fits, just. 2x apexi filters that end up fitting either side of the stock oil cooler.
would the side with no afm, in adamness case where he wants to just use a bit of pipe, have less Resistance and breather better / run that bank lean with the same values as the metered side? edit, i would a use a rb20 AFM as a dummy, providing they are the same physical size to rectify any flow differences. considering they are like candy prices 2nd hand
I was slightly concerned about this but thought the difference would really be insignificant? How much restriction is the AFM mesh in a real world application? I will look into an RB20 AFM like you suggest though as a dummy if they are the same physically.
Pretty sure pmack used 2 x maxima afm's. Cheap, and NEARLY the same size as Z32. Can't comment on the restriction difference in the afm's mesh/no mesh. I have no mesh on either of my afm's. I would think it makes F-all difference. We do have a balance tube remember. it's there for a reason
