ported & polished Throttlebody vs 80mm ??
ported & polished Throttlebody vs 80mm ?? Differences?? better of staying with stock P&P or go with 80mm
Its not a money issue....
just want to know If I will get more hp out of an 80 mm or stock ported
got a chance to get one cheap....
Its not a money issue....
just want to know If I will get more hp out of an 80 mm or stock ported
got a chance to get one cheap....
On The Tree
Joined: Dec 2003
Posts: 104
Likes: 0
From: McAllen, TX
I would definately say use the stock throttle body and port it!
Here's my story, yesterday I went to the track to test out my car right after I got the ported throttle body. The car loved it. My best ET before the ported TB was 13.59 @ 102mph. With the ported TB and TB bypass the car dropped down to 13.15 @ 105!!!! ....and that was on street tires.
Consider porting yours, it helped me out alot. A real noticable difference on the bottom end. But if you don't have sticky tires... you might need them after you port yours, I know I do because I had some traction issues on the 13.15 pass with my street tires.
Here's my story, yesterday I went to the track to test out my car right after I got the ported throttle body. The car loved it. My best ET before the ported TB was 13.59 @ 102mph. With the ported TB and TB bypass the car dropped down to 13.15 @ 105!!!! ....and that was on street tires.
Consider porting yours, it helped me out alot. A real noticable difference on the bottom end. But if you don't have sticky tires... you might need them after you port yours, I know I do because I had some traction issues on the 13.15 pass with my street tires.
I need more people who have done both...
I have stock Ported and Polished right now....
I Just have a chance to get an 80mm for my stcok P&P... swap with a buddy deal......
I have stock Ported and Polished right now....
I Just have a chance to get an 80mm for my stcok P&P... swap with a buddy deal......
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TECH Senior Member
Joined: Mar 2004
Posts: 14,620
Likes: 17
From: BFE
Actually it is not that the stock ported TB is better, it is the fact that the intake has a 75mm mouth therefore negating some of the gained effect at the 80 mm TB.
The one thing I thought about is that putting a 80 mm should in theory increase the air pressure in the stock manifold (going from big to smaller) but maybe I'm wrong.
I'm satisfied with mine and it definitly is an improvement over the stock one. Not to mention so many poeple ask me if I have a blower (The 80 mm sound like a Hoover)
The one thing I thought about is that putting a 80 mm should in theory increase the air pressure in the stock manifold (going from big to smaller) but maybe I'm wrong.
I'm satisfied with mine and it definitly is an improvement over the stock one. Not to mention so many poeple ask me if I have a blower (The 80 mm sound like a Hoover)
How would an 80mm throttle body improve flow with only the stock 66.2 mm equivalent diameter mass air body?
I've read posts saying the factory mass air is big enough to support 500 hp. If this is true then the factory throttle body is larger than a factory mass air body eliminting it as a restriction.
I've read posts saying the factory mass air is big enough to support 500 hp. If this is true then the factory throttle body is larger than a factory mass air body eliminting it as a restriction.
We are finishing up our bigger blade ported stock housing throttle bodies that should be ready in about another week! Pricing will be $179 with the larger blade!
__________________
Jason
Co-Owner, Texas Speed & Performance, Ltd.
2005 Twin Turbo C6
404cid Stroker, 67mm Twins
994rwhp/902lb ft @ 22 psi (mustang dyno) www.Texas-Speed.com
Jason
Co-Owner, Texas Speed & Performance, Ltd.
2005 Twin Turbo C6
404cid Stroker, 67mm Twins
994rwhp/902lb ft @ 22 psi (mustang dyno) www.Texas-Speed.com
On The Tree
Joined: Feb 2004
Posts: 112
Likes: 0
Originally Posted by PREDATOR-Z
The one thing I thought about is that putting a 80 mm should in theory increase the air pressure in the stock manifold (going from big to smaller) but maybe I'm wrong.
There was a post about this in the lounge (i think it was this board) dealing with "ram air" and how the shape of the openings do not increase pressure at all (velocity yes, pressure no).
just thought i'd throw that in.
TECH Senior Member
Joined: Mar 2004
Posts: 14,620
Likes: 17
From: BFE
Ok, assuming this is true (increased velocity) wouldn't that have a beneficial effect on the way the charge refils the chambers and perhaps increase the combustion rate?? and/or perhaps increase the inlet charge size itself? Therefore giving you more power!
On The Tree
Joined: Feb 2004
Posts: 112
Likes: 0
Originally Posted by PREDATOR-Z
Ok, assuming this is true (increased velocity) wouldn't that have a beneficial effect on the way the charge refils the chambers and perhaps increase the combustion rate?? and/or perhaps increase the inlet charge size itself? Therefore giving you more power!
Either way, more air = more power from what I've read.
TECH Fanatic
Joined: Jun 2002
Posts: 1,979
Likes: 3
From: Upstate NY
Originally Posted by PREDATOR-Z
Ok, assuming this is true (increased velocity) wouldn't that have a beneficial effect on the way the charge refils the chambers and perhaps increase the combustion rate?? and/or perhaps increase the inlet charge size itself? Therefore giving you more power!
Think of the TB just as a door that lets air into a big hallway (plenum). The air gets into the plenum, which "stores" it for a short time before a cylinder opens it's door (valve) off the hallway and asks for air. The velocity that makes a difference in cylinder filling is the velocity along the intake runner and intake port, leaving the hallway/plenum, not the velocity into the plenum.
A larger or ported stock-diameter TB removes the restrictions from in front of the door (75 mm plenum on stock intake), guides the air in and makes sure the door is fully open and the doorknobs don't stick out into the flow.
Yes, as the air slows down as it enters the large volume plenum, the pressure rises a little, but it's still below atmospheric pressure, or the air would flow back out thru the "door".
Sorry if this analogy is too basic. No offense intended to anyone.
On The Tree
Joined: Feb 2004
Posts: 112
Likes: 0
Originally Posted by Old SStroker
Yes, as the air slows down as it enters the large volume plenum, the pressure rises a little, but it's still below atmospheric pressure, or the air would flow back out thru the "door".