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Old 04-11-2006, 09:29 PM   #1 (permalink)
Buz
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Throttle body coolant bypass

What size coupler do I need to splice the coolant lines to the throttle body together? It would be nice to have what I need before it comes apart.
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Old 04-12-2006, 06:07 AM   #2 (permalink)
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Quote:
Originally Posted by Buz
What size coupler do I need to splice the coolant lines to the throttle body together? It would be nice to have what I need before it comes apart.
I used a 1/2".
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Old 04-12-2006, 06:03 PM   #3 (permalink)
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Can someone expand on this mod? What is it that is being bypassed and why?
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Old 04-12-2006, 06:34 PM   #4 (permalink)
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Hot coolant is run through most throttle bodies to improve emissions and supposedly keep them from icing up. This last part does not make sense to me since not all cars have this feature and I have never heard of a throttle body freezing up on a fuel injected car. I am in Texas though. Bypassing this makes the throttle body much cooler which makes for a slightly cooler and denser intake charge. It probably does not make a big difference but definitely can not hurt performance. It is an easy and inexpensive mod.
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Old 04-12-2006, 07:19 PM   #5 (permalink)
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Talking

alright, I'll bite...someone please show me as I don't have an Elise to go run and check out the throttle body for the coolant hose to bypasss. Can someone show before and after examples?

Yeah I know..this dude doesn't een have his Elise yet..call me names. But this has to hold me over until the Elise finally comes.
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Old 07-01-2008, 02:54 AM   #6 (permalink)
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do we have a DIY guide for this mod ?
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Old 07-01-2008, 07:22 AM   #7 (permalink)
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Im not sure this would make a dif on a turbo/supercharged car thats intercooled, someone jump in here and let us know.
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Old 07-01-2008, 08:33 AM   #8 (permalink)
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bwr/katana is not intercooled
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Old 07-01-2008, 08:45 AM   #9 (permalink)
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bwr/katana is not intercooled
Was not implying they were, but Im personally intercooled and would like to know.
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Old 07-01-2008, 09:24 AM   #10 (permalink)
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oh ok...sorry...we'll wait then....
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Old 07-01-2008, 08:13 PM   #11 (permalink)
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It can't make much difference in power. I sure couldn't tell. Whatever. I was bored.
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Old 07-01-2008, 08:34 PM   #12 (permalink)
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Originally Posted by Tracktimeplz View Post
Im not sure this would make a dif on a turbo/supercharged car thats intercooled, someone jump in here and let us know.

Air after the intercooler might be what, 130deg? What thermostat does the Exige have? 200deg? So, as long as the air going through the TB is colder than the water in the bypass then it should be a good mod.

Only case would be if the intake the TB is connected to actually heat soaks due to the engine to a temp up above the water temp... if that were the case the water in the TB might actually br cooling it down.

Unfortunately I don't have my Exige yet so I can't take any measurements myself.


This is a super common mod for most cars, but would be good to know for sure which is hotter on a supercharged car.

So, no one with an -S has taken the temp of their throttle body after a few hot laps with the water bypassed? My assumption is if the TB is hotter than 200deg the water needs to be fed back in.
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Old 09-25-2008, 05:21 PM   #13 (permalink)
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Do the "track-only" Cup cars have the throttle body bypassed?
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