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Craig,

Very nice. ( you do nice work)
Toyota used a bov on the MR2 turbos that recirculates back to the
intake. The theory was less load on the turbo because of the sudden
pressure increase when TB snaps shut as well as quicker throttle response
and less lag from not having to recharge a large recirculation casting and
the long intake plumbing ie.Porsche.
It was also mentioned dumping to atmosphere with a CIS can make the
sensor plate flutter and in later ECU controlled units it causes a momentary
rich condition caused by dumping pre measured air. Article said dumping back
to the intake on CIS cars was fine but the advantages could be lessened
because of the inherent sluggishness of the sensor plate to react to changes.
Just found it interesting and thought I'd pass it along.

Cole
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Mods: TurboKraft Custom IC, 934 Headers, GSX 61, Zork, Port Work, SC Cams, Air Mod Fuel Dist Relocated, Water Meth Injection, BL WUR, MSD 6530, Greddy EBC, Synapse Bov, Short 2nd & 3rd with 8:37 R&P, Wevo Shifter, Coupling, and Mounts, MTX-L SSI-4, Big Brakes, Rebel Coilovers, Bilstein Sports.
Old 02-24-2009, 03:45 PM
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A good part of it was done before I got it to be honest.

Hey that is good to know and now I recall hearing the same thing -
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Old 02-24-2009, 03:57 PM
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Quote:
Originally Posted by Helmsy View Post
I have just recieved my new IC and 964 elbow but I purchased a Forge Diverter Valve.

It is widely known that the original plastic valve does not last long and a better valve should be used with the 964 elbow.

Yes the old BOV valve body is removed and replaced with the elbow and valve. I will take some pics when I find time to install mine.
How is the Forge Diverter compared to the 964t BOV? My car is undergoing the same surgery right now. I'm just debating on the Turbokraft billet spacers or the stock phenolic spacers. My headers just came back from B&B as they needed to do some repairs on the welds. Now I just need to see when the Buckley Racing left heater block off plate will arrive.
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Old 02-24-2009, 09:09 PM
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Which is considered to be the "correct" diverter valve for a stock engine?
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Old 02-25-2009, 04:29 AM
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Quote:
Originally Posted by Ag02M5 View Post
One member plugged the intake and dumped the air to atmosphere.

Thoughts?
RT
This = bad... When ever you dump metered air off in to the atmosphere, the car runs like a bag of $hit. When I was younger I tried this very thing on my CIS car and it resulted in the car stalling, running slower, and Horrible part throttle... just because I wanted a noise.
Now I thought I could get away with it because I had a mechanical mass-air meter as opposed to an elctronic-----wrong, the 930 did not like it at all. The most amount of "noise" you can get out of these cars (if that is what someone is after) the best you can do on a CIS car is to get the intake that Craig has and get the 965 elbow with a billet diverter valve- then it is somewhat audible. As a performance solution, blowing off into the atmosphere is no good.
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Old 02-25-2009, 07:17 AM
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Quote:
Originally Posted by equality72521 View Post
Which is considered to be the "correct" diverter valve for a stock engine?
Any one of the volkswagon/audi/porsche plastic valves will work (as long as you got the 965 elbow) as well as any of the after market varients that will recirculate back into the intake below the mass-air plate.
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Old 02-25-2009, 07:20 AM
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Thanks Kris.
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Old 02-25-2009, 07:25 AM
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Quote:
Originally Posted by WPOZZZ View Post
Now I just need to see when the Buckley Racing left heater block off plate will arrive.
Where did you find it. I wonder if it will work on a 964.
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Old 02-25-2009, 07:37 AM
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Quote:
Originally Posted by Ag02M5 View Post
Where did you find it. I wonder if it will work on a 964.
It was from our host. Unfortunately, I just got several e-mails from them telling me it is NLA. I was kind of jazzed about a metal block off plate and must now order the fiberglass one.
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Old 02-25-2009, 12:17 PM
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Quote:
Originally Posted by Dai View Post
Here is a pic of the BOV.

What does the vacuum line connect to, and what diverter valve model is it? I'm going to go this route on both my 930 and 964t instead of using the 964t factory diverter.
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Old 02-25-2009, 07:54 PM
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Quote:
Originally Posted by WPOZZZ View Post
What does the vacuum line connect to, and what diverter valve model is it? I'm going to go this route on both my 930 and 964t instead of using the 964t factory diverter.
Can't help with the valve model, but connection is to port III on the throttle body.
Item 19 is my BOV. This port was originally for the decel valve (which I no longer have).



Another version of same thing ...

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Old 02-25-2009, 08:35 PM
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Synapse BOV

Those of you considering BOV's should look at the BOV from Synapse Engineering. From my experience, this type of valve works much better. Fits between the turbo and intercooler.

http://www.synapseengineering.com/

Hard to see in this photo but it's below the intercooler to the left of the fan. Recirculates back into the filtered air plenum before the turbo.

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Old 02-26-2009, 05:38 AM
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Quote:
Originally Posted by WPOZZZ View Post
What does the vacuum line connect to, and what diverter valve model is it? I'm going to go this route on both my 930 and 964t instead of using the 964t factory diverter.
This diverter valve is made by MODE Design (Bob Holcombe's specialty).
Old 02-26-2009, 05:34 PM
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Bryan,

Bob Holcombe is a great guy to work with and does the finest work I've
ever seen. I have bought intake and exhaust plumbing from him in the past,
when I got it everything was a perfect bolt on with zero issues. The hardest part
was deciding if I was going to put it on the car or hang it on the wall, pure art.

Cole
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Mods: TurboKraft Custom IC, 934 Headers, GSX 61, Zork, Port Work, SC Cams, Air Mod Fuel Dist Relocated, Water Meth Injection, BL WUR, MSD 6530, Greddy EBC, Synapse Bov, Short 2nd & 3rd with 8:37 R&P, Wevo Shifter, Coupling, and Mounts, MTX-L SSI-4, Big Brakes, Rebel Coilovers, Bilstein Sports.
Old 02-26-2009, 06:32 PM
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I agree with you Bryan, IMHO, Bob is the best in the business. I have one of his full bay intercooler on order and can't wait to have it install on my car for this spring.
Old 02-26-2009, 06:50 PM
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In case anyone wants to try is I set my Compressor Bypass Valve (what Porsche called it with the C2 Turbo) so it was open all the time with cruse and idle. This would keep the turbo spinning faster than with it closed and created a usable reserve. It was set so when I went from a manifold vac condition like at cruse and idle, it quickly closed. This gave me faster boost response.

Typically the CBV only opens upon closing the throttle at higher RPMs. This can not be done with the factory Bosch unit. To work it must have a larger surface area on the piston in the upper chamber (with the vac boost line attached) than the valve area. This way when the boost pressure builds in the upper chamber it can push the valve closed against the boost pressure off the inter-cooler.

I used one that looked like the Forge unit but it had adjustable spring tension in the upper chamber. I played with the spring tension using a hand operated vac pump to tune it.

It worked quite well for me years ago. I also had a frequency valve plumed around the WUR run by a controller that was was mappable as to rpm and manifold pressure. This allowed me to quickly reduce control pressure with acceleration to get the metering plate moving much faster. It also helped cure the lean surge typical with CIS and let me tune the air fuel ratio at all rpm points.

I had great throttle response between the two systems.
Old 02-26-2009, 07:46 PM
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Quote:
Originally Posted by Craig 930 RS View Post


Current recirc valve and cleanup post-rebuild:

.
Craig want to ask what pros of two coils or I am missreading pics.
How's that works?

Thanks


gottit it is twinplug setup. took a while to count wires.........
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Old 02-26-2009, 08:19 PM
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Craig, where'd you get that sweet carbon fiber fan shroud. Too bad it isn't more visible.
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Old 02-26-2009, 08:47 PM
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Well now, this was all very informative and answered most of my questions....all but one. With the stock recirc valve/housing removed in favor of using a 964 elbow and BOV, how does one go about mounting the intercooler? The mounts are an integral part of the housing.
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Old 03-02-2009, 02:53 PM
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I dont think there is not a feasible way to use the stock 930 inter cooler with the 965 elbow/ recirc valve (unless you maybe wanted to use the old housing and have it blocked off). I think this mod is done in combination with a diffrent inter cooler such as B&B, Kokeln, 965, Blown6, etc...
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Old 03-02-2009, 03:52 PM
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