Throttle body coolant bypass - LotusTalk

Buz · 04-11-2006, 09:29 PM

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.

Dave · 04-12-2006, 06:07 AM

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".

goelise · 04-12-2006, 06:03 PM

Can someone expand on this mod? What is it that is being bypassed and why?

Buz · 04-12-2006, 06:34 PM

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.

goelise · 04-12-2006, 07:19 PM

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.

Jean-Paul · 07-01-2008, 02:54 AM

do we have a DIY guide for this mod ?

Tracktimeplz · 07-01-2008, 07:22 AM

Im not sure this would make a dif on a turbo/supercharged car thats intercooled, someone jump in here and let us know.

Jean-Paul · 07-01-2008, 08:33 AM

bwr/katana is not intercooled

Tracktimeplz · 07-01-2008, 08:45 AM

Quote:

Originally Posted by Jean-Paul

bwr/katana is not intercooled

Was not implying they were, but Im personally intercooled and would like to know.

Jean-Paul · 07-01-2008, 09:24 AM

oh ok...sorry...we'll wait then....

Beanie · 07-01-2008, 08:13 PM

It can't make much difference in power. I sure couldn't tell. Whatever. I was bored.

EricH · 07-01-2008, 08:34 PM

Quote:

Originally Posted by Tracktimeplz

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.

ericwgexige · 09-25-2008, 05:21 PM

Do the "track-only" Cup cars have the throttle body bypassed?

04-11-2006, 09:29 PM	#1 (permalink)
Buz Registered User Join Date: Nov 2005 Posts: 1,920	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.

04-12-2006, 06:03 PM	#3 (permalink)
goelise AR #1275 Join Date: Mar 2006 Location: Midwest, USA Posts: 2,527 Images: 1	Can someone expand on this mod? What is it that is being bypassed and why? __________________ '06 Ardent Red Elise - black interior with LSS, Touring, HT, Starshield, Lotus Sport Clutch, Moroso Oil Pan, 2ZZ(#2), Ekological HIDs, Lotus Driving Lights, Stebel Horn, Bootie, Razo '06 Pedal mod,Snorkel Delete,Odyssey 680 with s111 bracket. Future Mods:LETSLA (ordered), Rear toe link brace Thank you FVMC! WOO-HOO!

04-12-2006, 07:19 PM	#5 (permalink)
goelise AR #1275 Join Date: Mar 2006 Location: Midwest, USA Posts: 2,527 Images: 1	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. __________________ '06 Ardent Red Elise - black interior with LSS, Touring, HT, Starshield, Lotus Sport Clutch, Moroso Oil Pan, 2ZZ(#2), Ekological HIDs, Lotus Driving Lights, Stebel Horn, Bootie, Razo '06 Pedal mod,Snorkel Delete,Odyssey 680 with s111 bracket. Future Mods:LETSLA (ordered), Rear toe link brace Thank you FVMC! WOO-HOO!

07-01-2008, 02:54 AM	#6 (permalink)
Jean-Paul Registered User Join Date: Mar 2005 Location: Greece, Athens Posts: 268	do we have a DIY guide for this mod ? __________________ I have the simplest tastes... I am only satisfied with the best !!! "Simplify & Add Lightness" J.P

07-01-2008, 07:22 AM	#7 (permalink)
Tracktimeplz Race lines on the mind Join Date: Apr 2008 Location: Northwest Florida Posts: 1,085	Im not sure this would make a dif on a turbo/supercharged car thats intercooled, someone jump in here and let us know. __________________ 2003 Honda S2000 - Suzuka Blue 2005 Magnetic Blue Elise Forcefed 275 turbo - Sold 05/20/09

04-12-2006, 06:34 PM	#4 (permalink)
Buz Registered User Join Date: Nov 2005 Posts: 1,920	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.

07-01-2008, 08:33 AM	#8 (permalink)
Jean-Paul Registered User Join Date: Mar 2005 Location: Greece, Athens Posts: 268	bwr/katana is not intercooled __________________ I have the simplest tastes... I am only satisfied with the best !!! "Simplify & Add Lightness" J.P

07-01-2008, 09:24 AM	#10 (permalink)
Jean-Paul Registered User Join Date: Mar 2005 Location: Greece, Athens Posts: 268	oh ok...sorry...we'll wait then.... __________________ I have the simplest tastes... I am only satisfied with the best !!! "Simplify & Add Lightness" J.P

07-01-2008, 08:13 PM	#11 (permalink)
Beanie untitled Join Date: Oct 2004 Location: Jacksonville, FL Posts: 2,910	It can't make much difference in power. I sure couldn't tell. Whatever. I was bored. __________________ It is all about "Other".

09-25-2008, 05:21 PM	#13 (permalink)
ericwgexige Registered User Join Date: Mar 2008 Location: Hatboro, PA Posts: 390 Images: 2	Do the "track-only" Cup cars have the throttle body bypassed? __________________ '07 CO Exige S TrkPk/TourPk/TrkContrl/Star - Braille 13.1lb batt, 2bular 8x24, Green filter, desnorkle, Gotham, shifter mods, Moroso oil pan, Pagid RS 4-2, fettled '91 NSX Blk/Blk many suspension mods,headers,exhaust(SOLD) '01 Integra GSR Blk/Blk Comptech header, intake, & rear tie/sway bar '04 CBR 600 F4i Red/Blk '01 Honda Rebel 250 - 80mpg!

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