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Airflow meter in 'cooler piping

gts_koop

By gts_koop,
in Engines & Forced Induction

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mambastu Collaborator

mambastu

Posted
Posted
What method did you use to fit the AFM in the pipe?

I'm guessing you used the same ID pipe as the original ID of the AFM?

Yes, I made a simple flat plate flange out of stainless steel and welded a bit of 76mm pipe to the inlet side and then used silicon pipe to connect it up to the rest of the 76mm custom intercooler pipework. I've used a GReddy E-manage to handle all the fuelling changes.

gts_koop Enthusiast

gts_koop

Posted
  • Author
Posted
u can just buy an adapter plate to fit on to the afm. gtskoop im running an rb25det.if you want ill post pics of my engine bay on here.

Thanks mate, im goin away soon and wont b checkin my emails 4 a while so when i get back, i'd definatly appreciate some pics of ur bay... so yeah, i'll PM ya :)

  • 2 weeks later...
Dr_Drift Veteran

Dr_Drift

Posted
Posted

I have done this a couple of times on RB20's and 25's and all I will say is that it makes a HUGE difference to the tune... As far as reliability for the AFM I haven't seen any specific problems, but it only makes sense that the pressurised warmer air with slight oil from the turbo would decrease the life of the AFM... but seeing as most of them are ok after 10 years, if it halfs the life to 5 years??

I run a Z32 AFM after the cooler on my CA, mainly cause there's a 4" bellmouth on the turbo and space is restrictive so it had to be after the cooler.. seems to work really well with no immediate reliabilty probs...

sam

  • 2 months later...
MearCat Proficient

MearCat

Posted
Posted
I have done this a couple of times on RB20's and 25's and all I will say is that it makes a HUGE difference to the tune... As far as reliability for the AFM I haven't seen any specific problems, but it only makes sense that the pressurised warmer air with slight oil from the turbo would decrease the life of the AFM... but seeing as most of them are ok after 10 years, if it halfs the life to 5 years??

I run a Z32 AFM after the cooler on my CA, mainly cause there's a 4" bellmouth on the turbo and space is restrictive so it had to be after the cooler.. seems to work really well with no immediate reliabilty probs...

sam

Dr_Drift,

Can you elaborate why it has made a difference to the tune? Differnece in tuning with just SAFC or a Full E-Manage type system? More accurate A/F ratios? More increaed in power? Ease of tune?...

gtrken Grand Master

gtrken

Posted
Posted

Done it to a few big hp cars with large turbo's to stop the air reversion problem which plays hell with the AFM causing hunting as it comes back to idle.

We did one in particular on a car that already had been tuned by us using one of the famous ( infamous ?? ) Lumpyroms.

All I can tell you is when we changed it to post intercooler, it ran totally different and required virtually complete retuning.

And yes it was an RB25DET and yes we did chip the Nissan computer that plugs in to the factory wiring plug and no it wasn't an RB25 computer :( :(

Cheers

Ken

carl h Proficient

carl h

Posted
Posted (edited)

i run blowthru maf on my car as ive got limited space for maf mounting near the turbo inlet (turbo inlet is 4").

so far its been good to me, but as stated before it can require retuning as mine required me to fiddle with the ecu's k consant to get it to run right (rechipped ecu).

as far as pipe work ive got 2.5" charge piping and use adaptors from 2.5 --> 3 to go to and from the maf and havent had any problems thus far.

however i have blown the little plastic square cover off of the maf which then in turn caused a massive boost leak, but after a thourough cleaning and a stern resilliconing it hasnt leaked again and actualy spools faster :).

this is actualy on a rb20det swapped into a s14 chassis currently making 288rwkw's before tuning......

Edited by carl h

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