T28

[ChEsTeR]

s13 ovners have 370cc injectors compared to 270cc in the s12's Yesterday i have instaled s13 injectors and remaked the MAF its now 60mm wide not mear stock 45mm. MAF that big will leen out whrew whole ragne of rpm's but will allow me to tune it more precise in the higher boost range.

[30psi]

The s13 uses the same air flow meter and that doesn't max out at 0.7 bar though. Its good for airflow up to 270bhp.

Worth noting that increasing the bore of the afm doesn't create a linear difference, but a logarithmic difference

[ChEsTeR]

S13 and s12 AFM are not the same. Thats all i can say. Can u explain term logarytmic diference?? Im a bit of with higher math.

[30psi]

The pre lambda ones are the same I have used both with no difference.

Pure examples here:

Small afm at idle

1.2v

Large afm at idle

0.8v

Small afm at full throttle

4.8v

Large afm full throttle

2.7v

On the Nissan s12's they have what is know as a VQ map which is a curve. The shape of the curve is difference for different afm's but the VQ map can be transplanted when using say a Z32 afm.

I can't drag up pics from ROM Editor coz I'm at work. If you look at this you can see the different VQ curves for the different afm's.

[ChEsTeR]

I know the diference betwen Vq maps but will alowing more air whrew the largere AFM lean the AFR??? Using Wideband abd ecumaster i can bring it back to proper seting but i want to avoide having the same AFM readout at 0.7 and 1.2 bar. I tryed to swap prelamba s12 AFM and s13 with lambda and it didnt want to cooperate. the one i have now ia with a o2 sensor. the one i had before ( no o2 sensor) didnt maxed out ever. But ECU with no o2 sensor will not work with AFM from a car with o2 sensor. I have checked that myself. I have both ECU's

[30psi]

yeah it will but you need to also be aware that the ecu master is nothing more than an SAFC in its principle isnt it?

I would be careful of changing the input voltage into the ECU too much because it will effect your ignition timing.

Unless the ecumaster alters the ecu output signals you have no way of adjusting the timing

[ChEsTeR]

Ecumaster can retard ignition in s12 but they are working on a new version so maybe someday it will be able to advance.

[30psi]

Does it delay the CAS signals then?

[ChEsTeR]

There are two signals coming from the CAS to the ECU and ich one is diferent.
It delays the signal from ecu to a power transitor(ignition module).

[mr_turbo]

as u guys seem to re4alli know ur stuff can any of u help me with my actuater mounting problem lol and wot can i fun my new turbo at safely?