Can some one point me in the direction of any chip for the vg30dett that allow you to run twin filters with the afm running on one intake only ?

 

Cheers

do you need a chip?

 

wouldnt a modified pipe do with two inlets?

 

thats all i had on mine

 

or am i way out here and making a pratt of myself?

If you run the afm from only one intake you half the amount of airflow the ecu sees and it will reduce fuel, the chip needs to work round that and sort out a lumpy idle I imagine

Sarah's on the right lines. Fit a Y piece and save the hassle. Don't think you can get any such chip that changes the parameters to that degree. You could fit some kind of resistor. TBH, just do the job properly.

One like this?

 

JWR do them but I thought I might find one on here, the engine is not in a zed I squeezed it into my 200sx, twin filters would make life a little easier

Similar, yes. AFM on the single pipe, filter on each side of the 'Y'

JWR do them but I thought I might find one on here, the engine is not in a zed I squeezed it into my 200sx, twin filters would make life a little easier

 

You can still run twin filters. Just run them through Y peice...or don't you have room?

 

Go to ITG and get a large single filter then. Really is no point wasting your time trying to get a chip written to compensate for under flow of airmass.

as you say mate, JWT do them, but plenty of people on here can burn one for you. They are know as dual pop(charger) chips.

 

Dual filters done properly are only really needed above 400rwhp, but don't do any harm below that. If there's no balance point then you need something to even out the airflow between the banks on idle - do a search for low speed drivability hose.

 

The other option you have is to use 2 afm's and use an apexi safc to add the signals together, this way all the air is measured and you have no idle issues.

 

the 2 into one options posted above are not worth it as you still get the same flow restriction

I had no idea that there was a chip you can get for adding another AFM. Interesting. :)

Right i see where the confusion is, its not the twin filters thats the problem but the space and the running of the pipes, it would be much better for me to have separate intakes for each side of the plenum, no y piece just separate intakes one of which would have the afm on it, if that makes it clearer

as you say mate, JWT do them, but plenty of people on here can burn one for you. They are know as dual pop(charger) chips.

 

Dual filters done properly are only really needed above 400rwhp, but don't do any harm below that. If there's no balance point then you need something to even out the airflow between the banks on idle - do a search for low speed drivability hose.

 

The other option you have is to use 2 afm's and use an apexi safc to add the signals together, this way all the air is measured and you have no idle issues.

 

the 2 into one options posted above are not worth it as you still get the same flow restriction

 

 

Thats it spot on, we have 2 afm's as it took 2 zeds to make it, sorry for killing 2 of your cars but it was in a good cause, never thought about twin afm's, will search for the balance pipe but i presume its similar to the plenum balance bar in that it allows for any pressure difference

If you go to one AFM with dual intakes, replacing the standard 370 cc injectors with 740 cc ones does balance things out. You will still need to do a bit of fine tuning though as the injector latency will be different. As mentioned above, you will need an idle stabilisation pipe.

Right I have searched on here for idle stabilization pipe to no avail ??, with the info you have supplied my mate is going to make up a smal circuit to add the 2 together and feed the ecu 1 signal, but I need to look into the balance pipe, is it fitted acros the intake pipes ?

The idle stabalisation pipe simply draws some air from the drivers side intake as normally it is all taken from the passenger side.

 

The first picture shows the fitment of the T piece. A better solution would be a Y type fitting as it would probably draw more evenly. The pipe nearest the suspension tower is the pipe I fitted.

 

 

The second picture shows a general pipe layout of the drivers side. It is the pipe on the left that you need to tap into (vacuum feeding the turbo not the high pressure turbo outlet side).

 

 

Picture 3 shows (rather badly) the tap into the hard pipe (photo taken just to the left of the radiator)

 

 

Let me know if you need more detail.

plus, if you use 2 afm's with an safc to add them you don't the idle hose as all the air will be metered.

Right I have searched on here for idle stabilization pipe to no avail ??, with the info you have supplied my mate is going to make up a smal circuit to add the 2 together and feed the ecu 1 signal, but I need to look into the balance pipe, is it fitted acros the intake pipes ?

 

Doolz do a kit which stabilises. do a search :)

oh im bored, so done it for you!! :D

 

http://www.z1motorsports.com/product_info.php?cPath=6_18&products_id=62

I have a Greddy dual intake which uses stock chip and runs with the stock Afm/Maf.

 

Would help if i said it was for sale lol.

plus, if you use 2 afm's with an safc to add them you don't the idle hose as all the air will be metered.

 

Correct but if you're getting into really high horsepower, you run out of room on the output voltage from the AFM. By only metering half the air you can double your output power before the same happens. Depends a lot on what you are doing I guess.

Thanks for the info and the links we have a plan, i think :wack:

 

here's a pic of the little engine hiding in the bay of my 200

 

Correct but if you're getting into really high horsepower, you run out of room on the output voltage from the AFM. By only metering half the air you can double your output power before the same happens. Depends a lot on what you are doing I guess.

 

but that's the point of having 2 AFM's, doubling the amount of air you can read :headvswal

but that's the point of having 2 AFM's, doubling the amount of air you can read

 

But if you ADD the signals, you might as well only have one because the ECU will only accept a 5 volt signal max :headvswal

But if you ADD the signals, you might as well only have one because the ECU will only accept a 5 volt signal max :headvswal

 

it really doesnt matter, as if you use 2 AFM's then you are getting half the airflow & half the voltage through each! :)

its just better for idle stabilisation

it really doesnt matter, as if you use 2 AFM's then you are getting half the airflow & half the voltage through each!

It all depends on how you process your MAF voltages.

 

If you "add" (as previsously mentioned) the two halves, you end up back at square one. The ECU can only accept a 5 volt signal and you will be limited to 550 odd HP.

 

If you "average" the two signals, then you still need to chip it. A piece of pipe and T piece is a lot cheaper than a MAF.

 

As I said before

Depends a lot on what you are doing I guess

The main reason was to just run 2 separate intakes one at each side no more than stock turbo's could put out at 15psi at the moment because the 200 chassis gets narrower at the fire wall and larger turbo's are going to be another challenge.

 

So adding 2 smaller maf's or the standard zed maf's together would not be a problem for now, or using a chip which was written to account for the use of the maf reading from one intake only