Custom Intake Manifold with Honda Throttle Body
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Custom Intake Manifold with Honda Throttle Body
I just wanted to post some pics of the custom intake manifold I built for my 89 Turbo II. I used a Honda 70mm throttle body and TPS for a cleaner look. I just wanted to get some feedback and opinions on whether you guys liked it or not.
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Coil pack bracket
I am running a EMS Stinger on my 7 and made a custom bracket to mount 4 coil paack facing straight up, then bracket places the four coils in the stock location of the trailing coil pack.
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After alot of searching around for a throttle body, I chose the Honda one mainly for the cosmetics and the clean mount of the TPS versus the stock dual plunger setup on a bracket running off of thirty rings on the throttle body, maybe that was a little exaggerated but even though it is a honda throttle body, and I do despise most of them mostly because of their inability of understanding the fact that intake +fart can+ altezza's does not equal race car, it is a very nice looking and clean throttle body.
I havent quite got to the point of running it yet so I am not sure how it is going to act, I would imagine with the proper tuning it will work good.
Aaron Cakes manifold was the main reason I decided to build my own, I originally wanted to do a fd upper intake, but then I decided I wanted to make it look as clean as possible so I made my own.
I havent quite got to the point of running it yet so I am not sure how it is going to act, I would imagine with the proper tuning it will work good.
Aaron Cakes manifold was the main reason I decided to build my own, I originally wanted to do a fd upper intake, but then I decided I wanted to make it look as clean as possible so I made my own.
#14
So... it says in the 87 FSM that the factory throttle body diameter is a total of 135mm (45 mm primary and 2 45mm secondaries). Im not sure if the S5 is different, but if the honda throttle body is just 70mm, isn't that a giant difference? Does throttle body size matter that much on a turbo motor? Or would the giant... plenum (i think thats what its called) make a difference? But it looks like you did a great job with the fab. And that TB is surely way sexier than the factory one.
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Very clean and good looking. I went a little different route but the same concept.
http://img.photobucket.com/albums/v2...hrotlebody.jpg
http://img.photobucket.com/albums/v2...p/P8090001.jpg
http://img.photobucket.com/albums/v2...hrotlebody.jpg
http://img.photobucket.com/albums/v2...p/P8090001.jpg
#16
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So... it says in the 87 FSM that the factory throttle body diameter is a total of 135mm (45 mm primary and 2 45mm secondaries). Im not sure if the S5 is different, but if the honda throttle body is just 70mm, isn't that a giant difference? Does throttle body size matter that much on a turbo motor? Or would the giant... plenum (i think thats what its called) make a difference? But it looks like you did a great job with the fab. And that TB is surely way sexier than the factory one.
45/2 = 22.5, 22.5*22.5 = 506.25, 506.25*3.1416 = 1590.435, 1590.435*3 = 4771.305
70/2 = 35, 35*35 = 1225, 1225*3.1416 = 3848.46
So it's obviously smaller. Don't go around thinking the stock TB is the same as a single round 135mm throttle body though. A larger circle gains exponentially more area than having several smaller circles. A 135mm throttle body would have an area of 14313.915!! It appears the Honda TB has 80.66% the area of the oem unit. I agree, it does look very nice. I'm just waiting on real dyno (not butt-dyno) numbers to see if this was negative progress.
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just because the total cross sectional area is smaller doesnt mean that it will flow any less, with one large opening the flow characteristics are drastically changed as there is less side wall surface to slow down the flow as velocity of the air at the wall is theoretically zero.
I would have made the plenum out of a cylinder for a smoother transition of air in and out of the plenum.
I would have made the plenum out of a cylinder for a smoother transition of air in and out of the plenum.
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In general, a smaller plate gives better throttle response and better low-rpm performance, while a larger plate gives better high-rpm performance. Multiple-plates, which are standard on most production street cars, allow for better engine control at the cost of peak performance.
Throttle plate rule of thumb for turbocharged engines, reference "Forced Induction Performance Tuning" by A. Graham Bell.
50mm - 250hp
56mm - 310hp
62mm - 390hp
70mm - 500hp
75mm - 600hp
85mm - 750hp
90mm - 830hp
100mm - 1000hp
He does have a giant plenum. The plenum is the big fabricated metal box between the throttle body and the runners.
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