C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

super ram question

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Old Oct 23, 2012 | 06:42 PM
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Default super ram question

Iam going to be installing a super ram on my car. Could someone tell me what the two threaded holes are for inside the plentum. I know the far back hole is for the mat sensor. I did a search and couldn't find anything. Thanks
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Old Oct 23, 2012 | 06:51 PM
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vacuum for power brakes ?
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Old Oct 23, 2012 | 07:24 PM
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looking at it from the front the hole on the bottom is for the sensor, the far right goes to brake vaccuum. On the back left one hole is for the vaccuum sensor that has to deal with the egr and the other other is for the vaccuum line that routes from behind the distributor. I think it goes somewhere close the purge canister area if memory serves me right. I plugged the rest up. Thats how it is on my 86.
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Old Oct 23, 2012 | 07:36 PM
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Thanks for the replies. I know what all the other holes are for on the backside. Their are 2 holes if you take the lid off and stare down at it. They go trough passages that go to 2 small openings just behind ware the air enters from the throttle body. Sorry I would post a picture but it would take me for ever. Like the last time I tried to.
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Old Oct 23, 2012 | 07:38 PM
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On mine, I use 1 port for the fuel pressure regulator, another for the map sensor and the third plugged. I take the power brake vacuum from the manifold port between 3 and 5. If I still had heat and air, I would use the 3rd vacuum port for that.
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Old Oct 23, 2012 | 07:39 PM
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i think those are supposed to be sealed and plugged.

Google for a set of install directions and i'm almost positive that the directions state to plug those holes with allen plugs and seal them with red loctite.

Mike
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Old Oct 23, 2012 | 07:39 PM
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Check this thread and this thread
Hope it helps !
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Old Oct 23, 2012 | 08:01 PM
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Originally Posted by red86silver78
2 holes if you take the lid off and stare down at it.
They go trough passages that go to 2 small openings just behind ware the air enters from the throttle body.
So they are internal ports ,not holes to the outside like the ones at the rear are ???


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Old Oct 23, 2012 | 08:08 PM
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Ya they are internal. The pic vetteoz posted the y shaped part but on the other side. If that makes sense.
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Old Oct 23, 2012 | 08:25 PM
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Originally Posted by red86silver78
2 small openings just behind ware the air enters from the throttle body.
EGR
EGR gases come up the EGR riser tube on pass side runner and go through the cast passage to the holes behind the TB.
I suspect if you have holes from that passage open into to the plenum they need to be plugged as mentioned above
EGR gases are dumped behind the TB so they get fully distributed and mixed up in the airflow
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Old Oct 23, 2012 | 08:45 PM
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Thanks vetteoz yes you are right i did not notice the small hole on the underside ware the passenger side runner bolts up to. Thanks everyone for you're help.
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Old Oct 24, 2012 | 01:06 AM
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Originally Posted by red86silver78
Thanks vetteoz yes you are right i did not notice the small hole on the underside
Just to clarify, you only plug the threaded holes you asked about , not the ones behind the TB
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Old Oct 24, 2012 | 09:23 AM
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Originally Posted by red86silver78
Thanks for the replies. I know what all the other holes are for on the backside. Their are 2 holes if you take the lid off and stare down at it. They go trough passages that go to 2 small openings just behind ware the air enters from the throttle body. Sorry I would post a picture but it would take me for ever. Like the last time I tried to.
Mine are plugged. As I recall they are 3/8-NPT plugs.
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