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Throttle Body By-Pass Value discussion

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Old 08-27-2013, 05:43 PM
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Well did this with the intention of alleviating some rough idle issues and it has helped so for that im trying to contribute back to the thread where i got the info from.
Old 08-27-2013, 05:48 PM
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I forgot this thread was created. I'm going to put this to rest now that I have a thermometer to show this mod is stupid.
Old 08-30-2013, 11:00 AM
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Thanks for the detailed walk through with pics. I kept mine reversible. Looking forward to seeing somebody actually measure results...
Old 08-30-2013, 01:09 PM
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Originally Posted by repsofchrist
Thanks for the detailed walk through with pics. I kept mine reversible. Looking forward to seeing somebody actually measure results...
What results are they going to measure ?
Old 08-30-2013, 01:15 PM
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said it once, will say it again .... nothing is preventing the air from getting heatsoaked by the UIM/LIM so this "mod" is moot.
Old 08-30-2013, 01:24 PM
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More posts moved from the DIY to the discussion thread.


Results have already been measured, and this does nothing.

The coolant is at ~180F running through a short section of the intake.

Anyone that thinks it's a beneficial mod is ignoring the 230F+ of the components all around the rest of the intake pipe or even higher heat of the exhaust manifold sitting a very short distance from the lower intake manifold.
Old 08-30-2013, 01:26 PM
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On Sunday I will have quite a few RX-8's around so as they show up I will measure throttle body temps while they are hot and post them up. Some are bypassed (that circuit is thru my turbo now), and some are stock. My guess is that all of the throttle bodies will measure at 200-230F (give or take a few degrees). This mod is pointless.
Old 08-30-2013, 02:16 PM
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Originally Posted by Brettus
What results are they going to measure ?
I was referring to what 9k is doing.
Old 08-30-2013, 03:06 PM
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2 Cents, Instead of using the bypass I just used the autobahn88 kit and connected the TB line from the coolant pump, directly to the rear housing as it got rid of a coolant line, and made things neater. my IAT are 3 degrees above ambient considering we have nothing on are car that measure the IAT post TB, this is a mod that we will never know if it works or doesn't, but for me at least it was a free mod so why wouldn't you do it
Old 08-30-2013, 03:14 PM
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Because you live in Buffalo and don't want your TB to freeze up
Old 08-30-2013, 03:28 PM
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I would like to see these results. Not that I would reroute mine back to the TB. I really like not having to mess with the coolant to remove the UIM.


Where do you plan to measure from? Booster line nipple? Maybe you can get one from the service ports on the LIM too. That would be interesting.
Old 08-30-2013, 03:45 PM
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Originally Posted by 9krpmrx8
Because you live in Buffalo and don't want your TB to freeze up
Yeah, because i'm driving my car in the winter My 8 is lucky to even see spring or fall.
Old 08-30-2013, 06:09 PM
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Originally Posted by 9krpmrx8
On Sunday I will have quite a few RX-8's around so as they show up I will measure throttle body temps while they are hot and post them up. Some are bypassed (that circuit is thru my turbo now), and some are stock. My guess is that all of the throttle bodies will measure at 200-230F (give or take a few degrees). This mod is pointless.
I look forward to seeing the results from your unbiased test lol.
Old 02-25-2014, 08:08 AM
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Per motoiq. Valve allows you to return to stock functionality on the colder days.
Old 02-25-2014, 09:11 AM
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Suggestion,

Bypass or not bypass, but do not block off. That water came from someplace, if you block off the line, whatever was getting cooled by that water is now not getting any flow.
Old 02-25-2014, 09:27 AM
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Originally Posted by 04Green
Suggestion,

Bypass or not bypass, but do not block off. That water came from someplace, if you block off the line, whatever was getting cooled by that water is now not getting any flow.
I agree. This might be an option for those who feel that the wise thing to do is block off the inlet with an object lol (i think i read that somewhere here)
Old 02-25-2014, 09:28 AM
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Unless you use two of them to create a "bypass loop"
Old 02-25-2014, 09:33 AM
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Originally Posted by RIWWP
Unless you use two of them to create a "bypass loop"
probably far more trouble than it is worth as you would need to incorporate some Y splits in the line and such. Anyone actually know what comes after the TB in the coolant line network?
Old 02-25-2014, 01:04 PM
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The line returns to the rear iron, passenger side. I wouldn't block it....
Attached Thumbnails Throttle Body By-Pass Value discussion-photo-3.jpg  

Last edited by 1.3_LittersOfFurry; 02-25-2014 at 01:09 PM.
Old 02-25-2014, 01:06 PM
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^ thanks. Yea i wouldn't ever block it. I think there was a thread similar to this where people were blocking it by dropping a bolt in the inlet to the TB coolant passage. *smh*
Old 02-25-2014, 01:14 PM
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Autobahn hoses are flexible enough I was able to just route my inlet hose to the rear iron. Less clutter on the block, no disrupted flow, no obnoxious connectors and splices.
Old 02-25-2014, 01:25 PM
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no issues in Buffalo winters?
Old 02-25-2014, 01:26 PM
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Originally Posted by Carbon8
Yeah, because i'm driving my car in the winter My 8 is lucky to even see spring or fall.
To quote myself.

Last edited by Carbon8; 02-25-2014 at 01:29 PM.
Old 02-25-2014, 01:26 PM
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LOL muuuuust be nice
Old 02-25-2014, 01:31 PM
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Just looked at my build matrix, I took deliver in March of 2012 with 23K ODO, and put it away this fall with 32K ODO.

Its become quite a spoiled thing since I purchased it.


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