Looking at doing the twin filter set up with one on each bank so as to do away with the top horn shaped pipe, but using an AFM on ech side, can i just splice into the main AFM harness on one side from the other AFM that i will be fitting, know what i mean ??

I assume even doing it this way there wil be benefits as i'm doing away with the top horn shaped pipe ? oh i will be having the SE chip that i've got re done again as i'm doing other things done at the same time, if that helps.

Very happy with what i've got (below) but there's always room for more :D

cheers

smithy :cool:

Is there any point in a 2nd AFM in the other side - surely the airflow must be identical on each so doing the multiply by 2 routine on the specially altered chip for the single AFM on one side must be the best way.

 

Besides I dont think you can simply merge the 2 sensor connections.

No, you'll need an Apexi AFC to feed both signals of the AFM's into the ECU.

 

-Eric

Cheers Eric, would that mean i do away with my HKS super afr, or does that still remain if i go for the apexi jobbie ? and i can run two AFM's with the appropiate connector and harnesses and splice them together ? any write ups on this you know off.

cheers boys

smithy :cool:

Smithy, why not just run one AFM and a dummy and have the chip modifed to suit? Saves buying a new AFR.

You should be able to tweak the HKS one to give you good idle then or you can mod the VQ table in the ROM.

Hi Smithy,

 

I have the setup your looking for and Z's only really benefit where the turbo's can produce 500hp and above. Low speed driving can feel a bit cumbersome with this.

 

The problem with just modifying the eprom to monitor airflow across 3 cyclinders is that the air idle control valve still operates thinking that air through the MAF is going to 6 cylinders. This screws up the idle and requires a further upgrade in balancing the air flow from both metered and unmetered sides of the engine.

 

I'm waiting for a new design to be completed where the intake is setup as an X pipe with the MAF on one side and a dummy MAF on the other.

 

This will give good airflow and good idle control and overcome the problem of imbalance on each side.

 

Steve

Smithy IMHO I don't think you are going to gain much by doing that with your current mods.

 

The single AFM is good for 400bhp+.

how do the skylines with 2 AFM's work?

Steve, you don't necessarily need the balance pipe. The problem is that for all voltages below 0.48v the VQ table spits out the same air flow figure. This means that the ECU puts in too much fuel for the actual air now entering. By tweaking the bottom of the VQ table to give a linear(ish) drop from 0.48 to 0v you solve the problem.

AFAIK the idle control valve operates on RPM only, the roughness is from the excessive richness.

I never got round to trying this on mine, but guys who have done it said it cured the problem completely.

Cheers guys for the input, curious though why i need a dummy MAF, it's a 3inch bore and the pipework i do for it is also 3 inch up as far as the bend at the top ? will speak with Pete at SE nearer the time about your thoughts John, i was also thinking (possibly) about ditching the SE chip and going with a Unichip instead.

I know the existing MAF doesn't max out till the mid 400's, but it has with that top horn pipe still in place proved to cause excess turbelence and restriction and not quite accurate readings for the ECU, according to all the posts i've read on TT.NET anyways ;)

so i thought well am doing a few mods at the same time, so may as well design one meself, me other kits have proved succesful so far :D

cheers

smithy :cool:

Was just thinking it's best to have a dummy MAF in there to simulate the pressure drop through the standard one. It might be significant at big airflows. I was just going to use a bust one I had on the other side.

Don't know if a unichip will help with this, depends how it senses load I suppose. Think the one I looked at for the 205 was rpm vs throttle angle on the maps, but that's not ideal for a turbo car as it makes no allowance for different boost pressures.

TBH if you learn to tweak it the ECU can do all the things these gadgets can do much better, just buy an emulator and play with it, it's cheaper too!