gains from a polished plenum? - MustangForums.com

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gains from a polished plenum?

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Old 02-14-2005, 01:12 AM
  #1  
UT04GT
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Default gains from a polished plenum?

What kind of hp gains will I see from a polished factory plenum? I figured a couple hp maybe?
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Old 02-14-2005, 01:15 AM
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devinsteen
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Default RE: gains from a polished plenum?

Maybe 1-2 hp...[&:] I don't think it's worth your time. Just get a new one from accufab or C&L...you will see better gains.
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Old 02-14-2005, 01:15 AM
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mdvaldosta
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Default RE: gains from a polished plenum?

bout the same as an aftermarket plenum, a 2-3 rwhp
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Old 02-14-2005, 01:17 AM
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devinsteen
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Default RE: gains from a polished plenum?

ORIGINAL: mdvaldosta

bout the same as an aftermarket plenum, a 2-3 rwhp
Really?? Damn, that's interesting.[&:] Is that what you did MD?
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Old 02-14-2005, 01:24 AM
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mdvaldosta
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Default RE: gains from a polished plenum?

yes I run a ported stocker, doesnt mean its the best - only that to me its not worth buying an aftermarket one just yet.
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Old 02-14-2005, 01:47 PM
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2000GT4.6
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Default RE: gains from a polished plenum?


ORIGINAL: mdvaldosta

bout the same as an aftermarket plenum, a 2-3 rwhp
I think your gonna see quite a bit more than that with a aftermarket plenum. At some point I have to get back to the dyno shop, and they wanted me to bring my old stocker and see what it does.

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).
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Old 02-14-2005, 01:56 PM
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mdvaldosta
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Default 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.
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Old 02-15-2005, 05:45 AM
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Mike02GT
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Default RE: gains from a polished plenum?

i have a 75 mm tb and plenum combo, and i noticed a big difference in my top end power. i can hear air suck a lot harder out of my CAI.
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Old 02-15-2005, 06:00 AM
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2000GT4.6
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Default 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.
Sorry bout that, I was meaning plenum and got confused.

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.
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Old 02-15-2005, 09:31 AM
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Vert_Lover
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Default 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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