gains from a polished plenum?
6th Gear Member
Joined: Jan 2004
Posts: 12,575
From: United States
RE: gains from a polished plenum?
ORIGINAL: mdvaldosta
bout the same as an aftermarket plenum, a 2-3 rwhp
bout the same as an aftermarket plenum, a 2-3 rwhp
They have a dyno hanging by the C&L meters in their shop of a 98 GT with boltons and cams (no LTs though) and he dynoed 10 more RWHP and like 8 RWTQ from a C&L meter (already had a 75 MM T/B).
I ♥ Acer
Joined: Sep 2003
Posts: 8,826
From: United States
RE: gains from a polished plenum?
talking about plenums, not maf's. And even an accufab is dyno proven to only add 2-3 rwhp over stock with an already installed 70mm tb. Hell, with an aftermarket plenum and throttle body modulard depot tested 4 or 5 of those over the stock setup... average was around 5 rwhp gain with BOTH afrtermarket throttle body and plenum... best was accufab with 7 rwhp and 7 rwtq. I guarantee you I've got that or more with my ported stocker and polished 70mm Ford throttle body.
6th Gear Member
Joined: Jan 2004
Posts: 12,575
From: United States
RE: gains from a polished plenum?
ORIGINAL: mdvaldosta
talking about plenums, not maf's. And even an accufab is dyno proven to only add 2-3 rwhp over stock with an already installed 70mm tb. Hell, with an aftermarket plenum and throttle body modulard depot tested 4 or 5 of those over the stock setup... average was around 5 rwhp gain with BOTH afrtermarket throttle body and plenum... best was accufab with 7 rwhp and 7 rwtq. I guarantee you I've got that or more with my ported stocker and polished 70mm Ford throttle body.
talking about plenums, not maf's. And even an accufab is dyno proven to only add 2-3 rwhp over stock with an already installed 70mm tb. Hell, with an aftermarket plenum and throttle body modulard depot tested 4 or 5 of those over the stock setup... average was around 5 rwhp gain with BOTH afrtermarket throttle body and plenum... best was accufab with 7 rwhp and 7 rwtq. I guarantee you I've got that or more with my ported stocker and polished 70mm Ford throttle body.
MM&FF and the local shop and all that, it was all about the plenum. I will have to see if they can get me a copy of the dyno.
I am really interested in trying this out now. I think i will spend a few extra minutes the next time I am on the dyno (late summer) and try it with and without.
1st Gear Member
Joined: Aug 2004
Posts: 112
RE: gains from a polished plenum?
Modular depot did some testing on the polishing of the plenums as well... they were seeing about a 2 or 3 hp gain from doing it on an accufab plenum (don't remember if it was 70 or 75 off the top of my head). I believe they'll do it for 100 bucks now if you buy your plenum and tb from them.
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