Throttle body upgrade?
Ok so I've been looking at this stock throttle body I've got laying around waiting to be polished. Had an idea when I removed the secondary butterfly's out of the upper intake since there bigger I know it would be a good thing to add more volume of air going into the motor. So has anybody bored out there stock throttle body secondary butterfly's to the size of the upper manifolds butterfly then matched and taped holes in the bar the held the butterfly's in the throttle body orignialy? I think FEED has a throttle body with larger butterfly's thus what got my wheels turning lol thanks any input is appreciated
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Yes, BDC does this as well. You can search ported throttle body I believe.
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Rotary works has a nice one from what I understand
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I am actually going to be going with the RW TB in the near future. It is a topic of debate because they are known to cause a vacuum leak, it is a simple fix however.
Most users have noted crisper throttle response. |
Ok cool thanks guys guess I'll be giving it shot then
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Originally Posted by silverTRD
(Post 11813949)
I am actually going to be going with the RW TB in the near future. It is a topic of debate because they are known to cause a vacuum leak, it is a simple fix however.
Most users have noted crisper throttle response. In all honesty, I'd stay away from the RW TB as well as other RW products. I should have listened to the reviews and shouldn't have bothered getting one. If you still want one and since the vacuum leak is such an easy fix, i'll sell you mine. |
Originally Posted by tt7hvn
(Post 11814597)
I didn't.... In all honesty, I'd stay away from the RW TB as well as other RW products. I should have listened to the reviews and shouldn't have bothered getting one. If you still want one and since the vacuum leak is such an easy fix, i'll sell you mine.
Yea I've read the and heard the same gonna be sticking with stock but will be porting out 55mm for secondary's and 50mm on primary then rematching it to the upper and modifying the gasket |
If you just look at the TB and the design of the openings and throttle plate shafts, you will see many points of poor design. A few can be easily corrected to reduce turbulence and thus increase air flow.
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Originally Posted by cewrx7r1
(Post 11814803)
If you just look at the TB and the design of the openings and throttle plate shafts, you will see many points of poor design. A few can be easily corrected to reduce turbulence and thus increase air flow.
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Rotorsports Racing can port out your TB, replace the butterflies, and then have your UIM/LIM extrude honed so everything is port matched along with a teflon coating on the interior and ceramic coating on the exterior (of the UIM/LIM).
I had it all done about 4-5 years ago and have not been disappointed :) |
Originally Posted by fendamonky
(Post 11815120)
Rotorsports Racing can port out your TB, replace the butterflies, and then have your UIM/LIM extrude honed so everything is port matched along with a teflon coating on the interior and ceramic coating on the exterior (of the UIM/LIM).
I had it all done about 4-5 years ago and have not been disappointed :) |
Originally Posted by 04G35S
(Post 11815794)
What was the price of all that?
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If you're not over 500 whp, the throttle body upgrade is a waste of time in my opinion. You won't see much gains.
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Originally Posted by IRPerformance
(Post 11816040)
If you're not over 500 whp, the throttle body upgrade is a waste of time in my opinion. You won't see much gains.
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Also there's a place online called maxbore.com they do these mods also he quoted me 375.00 to polish and bore it with a warrenty not sure if anyone's used him though at least for a rx7
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Originally Posted by fendamonky
(Post 11816018)
About a grand if I remember correctly.
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Originally Posted by hairball
(Post 11816460)
HOLY SHIT!!!!!lol
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Originally Posted by hairball
(Post 11816460)
HOLY SHIT!!!!!lol
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RC Engineering does throttle body porting. I think it runs around $450.00 if I am not mistaken.
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I Dremel Tools and a few hours of grinding can accomplish a lot. That is if you have the skills and know what to do.
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Having seen a feed TB install on another car, it would be a waste of time unless the manifold was matched.....and the only practical way would be extrude.....step between them was in the millimeters! Might have to consider the downstream restriction too, with a custom elbow/intercooler outlet to avoid negating any gain. Usual suspects are 2.75" diameter from memory.
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The benefits of Extrude Honing- increased airflow by approximately 45%, but the biggest benefit is the manifold & runners are flow tested throughout the procedure & balanced within 1% of each other- so flow is better equalized to both engine rotors- combined with the large bore TB results in a substantial improvement- with no loss of throttle response.
TB can't be simply enlarged- new throttle plates must be installed as well |
Extrude Honed Manifolds here:
https://www.rx7club.com/3rd-generati...folds-1066469/ |
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Rotary works has a nice one from what I understand |
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