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OBX ITB and Jenvey Kit comparison

 
Old 06-28-2011, 05:57 AM
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Default OBX ITB and Jenvey Kit comparison

I bought an OBX ITB kit awhile back just to see how they compare to the Jenvey kit I currently have. The OBX kit comes with a TPS, throttle bodies with linkages assembled, and a vacuum block attached. Out of the box, the first thing I noticed is that the OBX kit is quite heavy, much heavier than the Jenvey kit. The springs on the throttle bodies on the obx kit has more tension, while the Jenvey kit, the throttle linkage spins smoother. The obx setup utilizes bigger throttle bodies at least 2-3mm bigger than the jenvey kit. The casting inside the flange of the obx kit has some imperfections, but that can be smoothed out easily. My Jenvey OEM TPS adapter did not fit on the OBX unit. The thread on the water elbow is not the right size for the Engine Coolant Temperature sensor. I had to drill it out and retap it to a 12mm X 1.50. Overall isn't too bad of a unit, there is some work to be done like the Jenvey kit, the price is certainly attractive and it is nice how everything comes fully assembled. I am curious if the bigger throttle body bore will increase performance.
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Old 06-28-2011, 11:54 AM
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Good thread idea :thumbup;
In for more
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Old 06-28-2011, 02:05 PM
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The Jenvey S2000 kit uses the SF51 tapered throttle body which has a 51mm Inlet w/ 4.5 deg taper over 66mm body length. If my math is correct, that is a 10.4mm reduction in diameter, making the Outlet diameter of the throttle body 40.6mm.The OBX unit states it uses a 50mm throttle body. Based on your comments, I wouldn't be surprised if it is a straight bore body. Are you willing to verify this will calipers?

Can you elaborate on where you believe the extra weight is coming from? Additional use of steel parts?

Do the OBX throttle bodies have individual idle bleed screws or a single one for all four throttle bodies?

Does the TPS bolt pattern match up to the Colvern/Wabash unit despite not fitting the Jenvey OEM TPS adapter?

I believe I read in another thread that you considered buying these for the Hayward-style manifold with the angled water neck and bleeder valve. Are you using the manifold with your Jenevy TB's?

If you had to do it again, would you purchase the OBX unit instead of the Jenveys?
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Old 06-28-2011, 03:29 PM
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Originally Posted by RStoR View Post
The Jenvey S2000 kit uses the SF51 tapered throttle body which has a 51mm Inlet w/ 4.5 deg taper over 66mm body length. If my math is correct, that is a 10.4mm reduction in diameter, making the Outlet diameter of the throttle body 40.6mm.The OBX unit states it uses a 50mm throttle body. Based on your comments, I wouldn't be surprised if it is a straight bore body. Are you willing to verify this will calipers?
I'll eventually verify it with calipers, if I can first find them. Yes it is obvious that the throttle bodies are bigger on the obx unit, if I mount my jenvey units on the obx flange, you can see the o-rings looking in from the bottom of the flange. Also if you mount the obx air horns on the jenvey unit, you can clearly see that it is bigger.


Originally Posted by RStoR View Post
Can you elaborate on where you believe the extra weight is coming from? Additional use of steel parts?
Most of the weight is the flange of the obx unit, they are using a much heavier metal. As stated on the Jenvey website, they pride themselves in being lightweight. I'm sure the heavier metal is cheaper, thus making this a more economical unit.

Originally Posted by RStoR View Post
Do the OBX throttle bodies have individual idle bleed screws or a single one for all four throttle bodies?
The idle setup is much like the jenvey unit, although the cross linkage, the hex inside the bolt seems to be much larger.

Originally Posted by RStoR View Post
Does the TPS bolt pattern match up to the Colvern/Wabash unit despite not fitting the Jenvey OEM TPS adapter?
It should, I was going to test it but I seem to have lost my original tps sensor......The OBX unit does come with it's own tps sensor, i don't know how reliable it is. TPS sensors are simple in design enough.

Originally Posted by RStoR View Post
I believe I read in another thread that you considered buying these for the Hayward-style manifold with the angled water neck and bleeder valve. Are you using the manifold with your Jenevy TB's?
That was my original intention but the manifold is clearly too big for my throttle bodies and is much heavier. I would most like lose velocity going from the small throttle body port to the big flange.

Originally Posted by RStoR View Post
If you had to do it again, would you purchase the OBX unit instead of the Jenveys?
No I would not. The smoothness of the throttles, lightweight flange, and good support from jenvey is good enough for me. If I had another chance, I would of just bought the Toda units.
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Old 06-28-2011, 04:27 PM
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Originally Posted by freezingcoffee View Post
If I had another chance, I would of just bought the Toda units. Keep in mind, Toda units are bored 4age throttle bodies with their flange, but they provide everything to just bolt-on.
Why Toda over the Hayward units? Hayward appears to be a more complete option for several hundred dollars less than the Toda units.
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Old 06-28-2011, 07:27 PM
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Toda also offers their own pre-fabed plenum/manifold that easily attaches to their ITB kit. I would see this expandability as a plus.
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Old 06-28-2011, 07:49 PM
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Originally Posted by jbkonis View Post
Toda also offers their own pre-fabed plenum/manifold that easily attaches to their ITB kit. I would see this expandability as a plus.
That is very true, Jenvey also has something like this, but I don't know how well it fits in the s2000 engine bay.
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Old 06-29-2011, 02:30 AM
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Originally Posted by freezingcoffee View Post
No I would not. The smoothness of the throttles, lightweight flange, and good support from jenvey is good enough for me. If I had another chance, I would of just bought the Toda units. Keep in mind, Toda units are bored 4age throttle bodies with their flange, but they provide everything to just bolt-on.
This is definitely not correct. I specialize in 4age 20 valve race engines and also have Toda ITB's for my F20C. The Toda ITB's are custom units and not rebored 4age bodies. It is not possible to bore either the ae111 or ae101 toyota 4age throttles to fit a 50mm plate without breaking through to the outside.

Some of the early Toda ITB's did use the 4age throttles ( B16 and other engines) but the F20C set I have are their own units.
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Old 06-29-2011, 03:17 AM
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Are you sure the toda's are bored out 4ag throttles? I thought toda used the 4ag itb's for the b-series applications
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Old 06-29-2011, 03:44 AM
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Originally Posted by jbkonis View Post
Toda also offers their own pre-fabed plenum/manifold that easily attaches to their ITB kit. I would see this expandability as a plus.
I don't believe it has been validated that the Toda Surge Tank fits in the LHD engine bay. It may require relocation of items to do so. I have included a picture and dimensions for reference.



Hayward does offer an aluminum plenum but it must be customed fabbed.


Reverie is a UK carbon specialist that makes numerous ITB plenum configurations. I believe Emerald Performance carries or can acquire these. Since the backing plates are not pre-cut with holes, you could possibly use these on any vendor's ITB set-up.
http://www.reverie.ltd.uk/product_de...code=R01SE0459
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