Throttle Body Bypass-Mod
there is a thread on Nasioc about it.
Well I did this mod today...It was really easy. Here is what I did
1) I removed the intercooler
2) Then removed the coolant hoses on the throttle body
3) Then removed the BOV just to get out of the way
4) I went ahead and bought a hose coupler to make things a lot easier than removing one of the coolant hoses and rerouting the other. Here is what I used and it cost $1.97 at Home Depot
5) Connect to two hoses and reused the factory clamps
6) Then I bought a veriaty pack of vaccuum cap (nylon type) because they will not dry rot and actually have a warranty through Auto Zone for $1.99 and plugged the open ports on the Throttle Body.
7)Then I bolted the BOV & IC back on and went for a drive.
Now one could save some money and just reroute the longer coolant line but I found that it was going to be a big pain in the A$$! After I did this I went for a drive and when I got back I felt the Throttle body and it was not hot to the touch. After I drove 45 min to work I felt the Throttle body again and even after that long drive it still was not hot to the touch. I then felt the bypassed line and it was at operating temp of the engine.. Now I don't know if it is the plecebo effect but the car felt more responsive.....
1) I removed the intercooler
2) Then removed the coolant hoses on the throttle body
3) Then removed the BOV just to get out of the way
4) I went ahead and bought a hose coupler to make things a lot easier than removing one of the coolant hoses and rerouting the other. Here is what I used and it cost $1.97 at Home Depot
5) Connect to two hoses and reused the factory clamps
6) Then I bought a veriaty pack of vaccuum cap (nylon type) because they will not dry rot and actually have a warranty through Auto Zone for $1.99 and plugged the open ports on the Throttle Body.
7)Then I bolted the BOV & IC back on and went for a drive.
Now one could save some money and just reroute the longer coolant line but I found that it was going to be a big pain in the A$$! After I did this I went for a drive and when I got back I felt the Throttle body and it was not hot to the touch. After I drove 45 min to work I felt the Throttle body again and even after that long drive it still was not hot to the touch. I then felt the bypassed line and it was at operating temp of the engine.. Now I don't know if it is the plecebo effect but the car felt more responsive.....
Last edited by killthelights14; Nov 27, 2008 at 09:19 PM.
just remove the shorter line. connect the longer line to where the shorter line comes out of the head or block whatever it is. cap of the ports on the throttle body. thats it your done.
i stops the hot coolant from passing through your throttle body. helps a bit i guess. due to cooler intake temps.
i was going to do this a few weeks ago. but decided to leave it alone till spring. i need all the warm up help i can get. it gets cold as . around here.
i was going to do this a few weeks ago. but decided to leave it alone till spring. i need all the warm up help i can get. it gets cold as . around here.
I never actually thought about why coolant is run through the throttle body. I guess that makes sense...warming up the intake charge quicker for cold weather start-up. I suppose this would be a decent mod for those of us who garage our evo's during winter. Hmmmmmm
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If it's anything like a DSM, looping the coolant hoses will cause lots of fun idle surge because the coolant passes through the FIAV to cause it to close when it reaches operating temp.
Think about how fast air is moving through the TB and how little surface area there is, there's not much heat being exchanged from the TB to the charge air. Then think about how hot coolant gets and how hot the engine gets. Even with the lines removed, the heat from the engine is still going to transfer up through the head, intake, to the TB and heat it up just as much anyway.
You'd be better off buying a $25 intake manifold spacer to insulate heat from the engine.
Think about how fast air is moving through the TB and how little surface area there is, there's not much heat being exchanged from the TB to the charge air. Then think about how hot coolant gets and how hot the engine gets. Even with the lines removed, the heat from the engine is still going to transfer up through the head, intake, to the TB and heat it up just as much anyway.
You'd be better off buying a $25 intake manifold spacer to insulate heat from the engine.
If it's anything like a DSM, looping the coolant hoses will cause lots of fun idle surge because the coolant passes through the FIAV to cause it to close when it reaches operating temp.
Think about how fast air is moving through the TB and how little surface area there is, there's not much heat being exchanged from the TB to the charge air. Then think about how hot coolant gets and how hot the engine gets. Even with the lines removed, the heat from the engine is still going to transfer up through the head, intake, to the TB and heat it up just as much anyway.
You'd be better off buying a $25 intake manifold spacer to insulate heat from the engine.
Think about how fast air is moving through the TB and how little surface area there is, there's not much heat being exchanged from the TB to the charge air. Then think about how hot coolant gets and how hot the engine gets. Even with the lines removed, the heat from the engine is still going to transfer up through the head, intake, to the TB and heat it up just as much anyway.
You'd be better off buying a $25 intake manifold spacer to insulate heat from the engine.
Every little bit adds up though in the end. But, doing this is almost negligable (sp) because you still have 1000+ degree EGR gasses being routed through your intake manifold. Heck, the coolant in the TB is probably helping to cool the intake manifold/TB more than anything because of the EGR gasses.
I just did it for sake of simplicity, one less "thing/stuff" to have to worry about. And probably 0.000048oz weight savings. Yipee.
well is there anyone who has had this done for a good amount of time? Im asking to see if there have been any long term effects of doing this, both positive and negative. I guess it sort of maes sense, but then it doesnt seem worth it at the same time....