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gulp... fmu ?


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Plans changed for the TT setup since I'm trading those two testicle sized snails for a Holset H1C. Still will be using just a adj FMU, 255lph fuel pump, 2 step colder plugs and possibly a adj fpr if needed for the time being. Not to mention tossing a check valve or two onto the vacuum line to the dist. so it won't adv the timing that much. Is it really needed that if I'm sticking with the NA parts that I swap the turbo AFM internal into my NA AFM? Just something that I heard?

Yummy

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Is it really needed that if I'm sticking with the NA parts that I swap the turbo AFM internal into my NA AFM? Just something that I heard?

No.. you swap n/a electronics into a turbo afm. If you don't get a bigger afm housing you won't be able to rev over 4000 rpm.

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I found a auction for one that had the cover off and it looks pretty easy so I'm not worried. Thanks for clearing that up for me. Now it's parts buying time. Expect a thread on the 280z with the new setup. I have a friend with a WB o2 that help me with tuning so I wouldn't blow it up too fast!

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I'm running ALL stock 76 efi and 12 to 14 psi of boost and a MSA stage 1 turbo cam. The engine pulls great to 6000 rpm and sometimes hits 6500 or 7000 rpm by accident in 1st and 2nd gear. No need for a turbo afm, the stock NA afm will work just fine.

 

Just use the vacuum advance as normal. When the boost comes on, the vacuum advance will shut down all by itself. It needs vacuum to work and boost is anti-vacuum.

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That's interesting that it works so well for you Pyro. I'm not doubting you at all, but when I ran the na afm I absolutely couldn't go past 4000 rpm. It was as if I didn't have the pedal down far enough, even though it was floored (intake restriction). Using the turbo afm fixed it. If it's working for you, then dosquattro should give it a shot.

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i also used to run a n/a afm w/ all stock n/a electronics and fuel setup on n47 motor w/ a t4 turbo pushin 7-15 psi and could rev up just fine as well.

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Yes, I think he should try it with the stock afm first before swaping parts. The stock AFM also works very well on two other NA turbo conversions that I'm involved with.

 

I did however, find that a retro-fit turbo runs better on the NA AFM with a tighter flapper spring. 5 to 10 teeth tighter makes it spool quicker and pull harder.

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Not rev'ing past 4k, sounds like a fuel mix problem, too lean up top.

False. If it had been leaning out it would have ran rough and likely detonated. It was an intake restriction. There was no roughness. Just no more air available to accelerate further.

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  • 5 months later...

Brought back from the dead..lol. I picked up a AE86 and have been giving all my love(money) to that but I've got a nice chunk of change coming so I'm planning on buying a nice snail yada yada yada. For the people who were running FMU's which ratio were you using or did you just use like a adj fmu like a cartech? The FMU is just until I can get some more green to go MS but I want to drive it before then.

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