ported throttle body
I purchased one of Mazmart's engines during a one time Full Moon sale. Not sure whose original core it was. I am working on it in my garage adding some goodies like the Greddy oil pan, Sohn adapator, new rebuilt lower intake with the new SSV valve, etc.
My original engine is still in the car and fires right up fine. 88K on it now.
My original engine is still in the car and fires right up fine. 88K on it now.
whines all the way home
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Joined: Oct 2004
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From: Towson/Baltimore, MD
yes, the right up is here, http://www.rotary4life.com/forum/sho...p?t=331&page=2 https://www.rx8club.com/showthread.p...27674&page=260 and here,,, Im might be taking it off this weekend,,,,
Thread revival FTW.
Ported and polished my throttle body today with leftovers from porting turbo housings.
The butt dyno definitely feels a pickup in the midrange, and throttle response is improved.
Bypassed the throttle body coolant line too so maybe both are helping.
Good mod!
Ported and polished my throttle body today with leftovers from porting turbo housings.
The butt dyno definitely feels a pickup in the midrange, and throttle response is improved.
Bypassed the throttle body coolant line too so maybe both are helping.
Good mod!
Yeah, this is essentially the same concept as the VFAD except it's not adjusting like the vfad.(Or all the other intake valves too)
The small chamber helps with low end - keeping the velocity up in the lower rpms when the engine cannot pull in as much air (or lower engine VE), while the second longer chamber and storage area provides the needed air for the mid-high end powerband.
By eliminating the VFAD, increasing intake flow, and opening up the throttle body your essentially "tuning"/shifting your intake or powerband.
Which is why FI guys might encounter a much more noticeable change, they have already shifted they're powerband, so any intake change to support that - would help.
Intake tuning, intake tumbler valves, intake runner valves, adjustable intakes valves. Whatever you want to call it. Has been used for decades to smooth out the powerband.
On my application (See my vbgarage in sig.) I noticed a difference, however I'm not sure if one would on a completely stock rx8.
Smoothing out the entrance of the throttle body which I think helps IMO for reducing the resistance of air entering the throttle body/intake. However there's that golf ball theory that people scream blasphemy when it comes to this kind of stuff.
Just spitting out my concept here before I start work, but at least you get the idea.
EDIT** It'd be interesting to see this combined with the VFAD now that I think about it.
Didn't manage to snap a pic of my throttle body, but like I said I've done a few port and polishes before. Here's a pic of my old 16G Evo III Turbo housing (running a 38mm 02 external wastegate) I got to nearly a mirror finish. At least you get the idea I didn't hog out my throttle body egg shaped LOL.
The small chamber helps with low end - keeping the velocity up in the lower rpms when the engine cannot pull in as much air (or lower engine VE), while the second longer chamber and storage area provides the needed air for the mid-high end powerband.
By eliminating the VFAD, increasing intake flow, and opening up the throttle body your essentially "tuning"/shifting your intake or powerband.
Which is why FI guys might encounter a much more noticeable change, they have already shifted they're powerband, so any intake change to support that - would help.
Intake tuning, intake tumbler valves, intake runner valves, adjustable intakes valves. Whatever you want to call it. Has been used for decades to smooth out the powerband.
On my application (See my vbgarage in sig.) I noticed a difference, however I'm not sure if one would on a completely stock rx8.
Smoothing out the entrance of the throttle body which I think helps IMO for reducing the resistance of air entering the throttle body/intake. However there's that golf ball theory that people scream blasphemy when it comes to this kind of stuff.
Just spitting out my concept here before I start work, but at least you get the idea.
EDIT** It'd be interesting to see this combined with the VFAD now that I think about it.
Didn't manage to snap a pic of my throttle body, but like I said I've done a few port and polishes before. Here's a pic of my old 16G Evo III Turbo housing (running a 38mm 02 external wastegate) I got to nearly a mirror finish. At least you get the idea I didn't hog out my throttle body egg shaped LOL.
Last edited by viprez586; Mar 21, 2013 at 08:00 AM.
lol thanks. That housing was pretty wicked. id spike to 28psi in first and second gear before it settled to 26psi. Likely from making the wastegate opening too big!
Whoops! nothing a good tune couldnt handle!
Whoops! nothing a good tune couldnt handle!
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Joined: Feb 2014
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From: Central, IL
BDC Motorsports :: Rotary Engines / EFI Systems / Specialized Porting
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Last edited by badinfluence; Apr 25, 2014 at 02:47 PM.
