Stock Maf Limits

Juan@Fontana

I suppose this is a legitimate question, have any of you guys tried running the MAF's post turbo (on the turbo intakes / no pressure side) opposed to the intercooler charge piping? I know the part number on the R35 MAF and Z34 MAF is the same and if i recall correctly R35 guys are making about 750AWHP on 3" MAF housings and 850whp on 80mm housings. on a RWD platform that should translate to about 5% more whp.

Chuck33079

You're suggesting switching to a draw-through as opposed to blow-through? That's going to require the BOVs to be plumbed back in pre-turbo since otherwise they'd be venting metered air and you'd get a rich hiccup every time the BOV opens.

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BBRSpeedWorks

It shouldn't because the Only time bovs are open is when you off the throttle. This is how my turbo talin is setup from the factory..time to get in the lab..and make something up

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Chuck33079

That's a well-documented problem that most draw-through maf-based cars (Isn't the Talon MAP-based?) face with a BOV vented to atmosphere. If you vent metered air, the computer doesn't know that the air is gone and you swing rich for a second between shifts or when you let off throttle. It just stumbles a bit in between shifts.

Plus, are we worried about the different air density between the air at the maf and the post-turbo, post-intercooler air? Isn't this one of the (many) problems with the maf pocation on the Stillen kit?

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BBRSpeedWorks

No the talon runs the 3in gm maf with a after market atmosphere bov and it don't have any issue. I guess no one will know till they try it...I'm not to worried about cuz I'm at 10psi and still have a full volt left be4 it's at max but I would like to try just to see what happens

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BBRSpeedWorks

But as I look the r35 maf's are in the same spot as ours. When I went to 3in and tall maf's it fixed all my problems. I think everybody just need bigger pipe

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Juan@Fontana

yeah except R35s have draw through, instead of blow through 1,

i would personally not run BOV's and just install some Turbosmart or Synapse bypass valves (plumb back)

BBRSpeedWorks

ur right they are i just said there in the same spot....and BOV to Bypass is up to that person. me personlly have had to many turbosmart things fail on me to use them...

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Mitco39

R35s also switch to speed density tuning under load. The MAFs are only used under low load because speed density tuning isnt accurate at low flow rates.

Also if you are only sucking through the mafs they will not be able to read as high as when you are blowing through them. I believe that was discussed earlier on in this thread with phunk.

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