Do I need a AFM upgrade

[SLIXK]

I’ve ordered all the good fruits for my stock rb25 neo stagea (turbo, manifold & intake) will get haltech and fuel management done by tuners, but there’s one thing I don’t know anything about which is the stock AFM. My goal is atleast 300 KW atws.

Basically do I need to upgrade my AFM to like a Z32 or can I just get a MAF delete. Unless the haltech ecu controls the airflow data on its own? 🤷‍♂️ lol

[Ben C34]

Haltech ecu wont use the afm.

[SLIXK]

On 7/13/2022 at 1:09 AM, Ben C34 said:

Haltech ecu wont use the afm.

So what happens to the afm/maf physically?

[GTSBoy]

Remove. Or bolt to the strut tower like they did in 1990.

[Duncan]

Haltech can run an AFM, can't it? It just happens to have an onboard MAP sensor in the ECU it can use instead.

I'm not sure where the standard AFM runs out of resolution, maybe around 250kw? If you are using the standard intake just leave it there, plugged in or not if you are using MAP.

 

An AFM is better than a MAP sensor at lower boost loads as it deals with temperature and altitude differences better, but a MAP can be simpler when you are making a custom intake or using big boost levels where the AFM runs out of resolution.

[joshuaho96]

On 7/12/2022 at 5:57 AM, SLIXK said:

I’ve ordered all the good fruits for my stock rb25 neo stagea (turbo, manifold & intake) will get haltech and fuel management done by tuners, but there’s one thing I don’t know anything about which is the stock AFM. My goal is atleast 300 KW atws.

Basically do I need to upgrade my AFM to like a Z32 or can I just get a MAF delete. Unless the haltech ecu controls the airflow data on its own? 🤷‍♂️ lol

For a single throttle body there's no real need for a MAF. Haltech Elite supports both. If you want to keep the MAF in place to help you tune though that can help quite a lot with part throttle setup. At steady state in a load cell you can empirically derive volumetric efficiency with a MAF. GM's ECUs can use this data to help with transient throttle too.

[robbo_rb180]

On 7/13/2022 at 7:56 AM, Duncan said:

Haltech can run an AFM, can't it? It just happens to have an onboard MAP sensor in the ECU it can use instead.

I'm not sure where the standard AFM runs out of resolution, maybe around 250kw? If you are using the standard intake just leave it there, plugged in or not if you are using MAP.

 

An AFM is better than a MAP sensor at lower boost loads as it deals with temperature and altitude differences better, but a MAP can be simpler when you are making a custom intake or using big boost levels where the AFM runs out of resolution.

 

On 7/13/2022 at 8:12 AM, joshuaho96 said:

For a single throttle body there's no real need for a MAF. Haltech Elite supports both. If you want to keep the MAF in place to help you tune though that can help quite a lot with part throttle setup. At steady state in a load cell you can empirically derive volumetric efficiency with a MAF. GM's ECUs can use this data to help with transient throttle too.

I have been wanting to use an AFM/MAF with a Haltech to see what can be achieved as tuning supercharged Gen 4 LS based stuff makes the drivability and economy pretty good using AFM and Map based VE