383 - Breathing Issues
Thread Starter
Burning Brakes
Joined: Jan 2009
Posts: 871
Likes: 15
From: Shepherdsville Kentucky
383 - Breathing Issues
I have a 383 with ported TPI that is serving me well except it's not getting enough air into the plenum. I see a wide variety of ram air / cut lid / filter replacement mods. Forward of the TB I've only replaced the filter with K&N.
Any suggestions/recommendations?
Thanks!
Any suggestions/recommendations?
Thanks!
Thread Starter
Burning Brakes
Joined: Jan 2009
Posts: 871
Likes: 15
From: Shepherdsville Kentucky
Ported the plenum, SLP Runners and the TPIS Big Mouth intake. Heads were also port matched and I've got Melrose Headers to 3" exhaust to Magnaflow Mufflers. The builder advised me that I had a bottleneck at the air intake.
Team Owner
Joined: Aug 2004
Posts: 21,543
Likes: 3,216
From: Park City Utah
If your builder is right (and that has not yet been confirmed), the bottle neck would be the stock MAF.
Put a GOOD vacuum gauge on it. Run it from idle to fuel cut/Redline at WOT. If you see ANY vacuum at all, your builder is right. If not, he is wrong. If you have atmospheric pressure in the plenum at WOT, there is no restriction ahead of the plenum. (TB, MAF, tube, filter housing or filter).
Put a GOOD vacuum gauge on it. Run it from idle to fuel cut/Redline at WOT. If you see ANY vacuum at all, your builder is right. If not, he is wrong. If you have atmospheric pressure in the plenum at WOT, there is no restriction ahead of the plenum. (TB, MAF, tube, filter housing or filter).
