DIY: Throttle body bypass mod
08-08-2006, 09:32 PM
#101
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Originally Posted by Ryan34
This mod is great on F-body's, the throttle body bypass is dynoed to get 6-8 hp on camaros and firebirds.
Just to add my 2 cents
Just to add my 2 cents
08-14-2006, 05:43 PM
#102
Born 2 Race
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i'm worried that it runs through the throttle body to cool it off when the motor gets really hot. The trottle body is close to the intake manifold. I live in the maritimes so i don't know how it would affect my 8.
08-18-2006, 12:51 PM
#103
Rotary lover
The engine bay definately heats up the throttle body as well, a lot, why not take a tube (bigger than 3/8" to get flow volume)with a horn or flare at the front, to the front of the car and catch the (still warm but much cooler than engine bay temperatures) air and just let it blow trough the body and out again, just loose pipe down to ground. Then it works as a small forced induction idea forcing cooler air from front through body, the faster you go the better it works. Then with startup it wont change any thing.
cost will also be very small
worth the try, I will do it some time.
Philip
cost will also be very small
worth the try, I will do it some time.
Philip
08-19-2006, 07:26 AM
#104
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One thought on this mod. Like mentioned before, the coolant is cold on startup so making the mod probably does not effect that, sooo, why the coolant through the TB after it warms up? Ever heard of carburater freeze or venturi freeze? I don't know if it is the same on TBs but I imagine when the TB is partially closed the air is constricted forcing it to speed up. This reduces the air temp at that point and during mild conditions, that is, not 0 degrees but like around 30s, 40s, the moisture in the air can freeze to the TB or venturi. Had it happen once in my carburated car and had to pull over and wiat for the ice to melt. Carb heat, where heated air from a heat exchanger off of the exhaust, is common on aircraft for that reason. Why would it go through all of the time, maybe it is a cheap version instead of having to add it to programming and add extra moving parts. The car has to be a great value for what you get for a reason.
08-19-2006, 08:00 AM
#105
No gas in an EFI TB, so no venturi. Therefor, no icing.
Plus, no IAC valve like the OBD-II cars, so no wax ball or something similar to soften.
Its just a brass butterfly and nothing else.
Still, there is no real benefit to this mod since the IM is plastic.
Plus, no IAC valve like the OBD-II cars, so no wax ball or something similar to soften.
Its just a brass butterfly and nothing else.
Still, there is no real benefit to this mod since the IM is plastic.
08-25-2006, 11:45 AM
#106
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A possible thought. Could the coolant through the throttle body be for emissions purposes.
Constant air temperature to easily control emissions via the ECU over all ranges of outside temperatures and acceleration changes.
Constant air temperature to easily control emissions via the ECU over all ranges of outside temperatures and acceleration changes.
08-25-2006, 03:52 PM
#107
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MM,
When the throttle is "shut" at idle, there is a big pressure drop across the throttle plate. 20-ish inches of Hg, right?
This is a big enough change in pressure to cause water to condense and freeze in some very specific cases. I agree it's a rare case, but the engineers have to design for the rare corner cases too.
As for using the water to keep the air the same temp, two problems here:
The MAF is what cares about air temp and it has it's own temp sensor and it's in front of the TB
Look at the size of the water hose going to the TB. No way you can flow enough water into here to heat up the couple hundred CFM that the engine sucks in.
When the throttle is "shut" at idle, there is a big pressure drop across the throttle plate. 20-ish inches of Hg, right?
This is a big enough change in pressure to cause water to condense and freeze in some very specific cases. I agree it's a rare case, but the engineers have to design for the rare corner cases too.
As for using the water to keep the air the same temp, two problems here:
The MAF is what cares about air temp and it has it's own temp sensor and it's in front of the TB
Look at the size of the water hose going to the TB. No way you can flow enough water into here to heat up the couple hundred CFM that the engine sucks in.
10-22-2006, 02:25 PM
#108
Rotary Crawfish
To add a little tidbit of info on this mod, the coolant flow through the TB is to prevent any icing in the throttle body. it will help on any car but you could (and I mean probbly not ever) but could get some icing under the right conditions.
10-23-2006, 12:17 AM
#109
hukbong himpapawid
...I was looking at my engine bay and I followed both hoses. the hose coming from the top of the TB led to the H2O pump area and the other one to block/housing by the firewall. now, I'm thinking about removing the 2 hoses and plugging the corresponding holes (water pump & block/housing). has anybody done this? I'm guessing that you won't need to circulate coolant any more since you are not trying to heat/cool the TB anymore and I don't think plugging the said holes is gonna hinder anything... any thoughts?
10-25-2006, 08:21 AM
#110
Originally Posted by cajunrx8
To add a little tidbit of info on this mod, the coolant flow through the TB is to prevent any icing in the throttle body. it will help on any car but you could (and I mean probbly not ever) but could get some icing under the right conditions.
10-26-2006, 03:49 PM
#111
IstanbulNotConstantinople
Originally Posted by davefzr
I also used some bonding silicon adhesive on all three of my caps.
I removed the 2 hoses that connect to the throttle body, and connected them together.
That leaves me w/ two caps to cover. Did I miss something?
10-26-2006, 03:59 PM
#113
IstanbulNotConstantinople
OK, I think I get it now.
davefzr did the throttle body mod and he added a breather for his oil line.
He had 2 caps from the throttle body, but because he did the breather, he was left w/ a hole in the intake bellow.
I don't have to worry about that 3rd hole because I added a oil catch can instead.
davefzr did the throttle body mod and he added a breather for his oil line.
He had 2 caps from the throttle body, but because he did the breather, he was left w/ a hole in the intake bellow.
I don't have to worry about that 3rd hole because I added a oil catch can instead.
10-27-2006, 11:56 AM
#114
Originally Posted by cesaralaniz
OK, I think I get it now.
davefzr did the throttle body mod and he added a breather for his oil line.
He had 2 caps from the throttle body, but because he did the breather, he was left w/ a hole in the intake bellow.
I don't have to worry about that 3rd hole because I added a oil catch can instead.
davefzr did the throttle body mod and he added a breather for his oil line.
He had 2 caps from the throttle body, but because he did the breather, he was left w/ a hole in the intake bellow.
I don't have to worry about that 3rd hole because I added a oil catch can instead.
10-30-2006, 12:12 AM
#115
hukbong himpapawid
so instead of re-connecting the coolant lines, I capped the two coolant outlet/inlet using a rubber bypass plug and a clamp. I don't know if it's gonna be enough to withstand the heat and pressure tho'...
10-30-2006, 09:23 AM
#116
IstanbulNotConstantinople
Originally Posted by d j
so instead of re-connecting the coolant lines, I capped the two coolant outlet/inlet using a rubber bypass plug and a clamp. I don't know if it's gonna be enough to withstand the heat and pressure tho'...
I didn't do it since I still have a little time left on my warranty. I might go back if they come out with another flash/recall.
Reaching those outlets doesn't look easy though.
10-30-2006, 08:09 PM
#117
hukbong himpapawid
Originally Posted by cesaralaniz
I think that's a better option if you're not worried about going back to stock.
I didn't do it since I still have a little time left on my warranty. I might go back if they come out with another flash/recall.
Reaching those outlets doesn't look easy though.
I didn't do it since I still have a little time left on my warranty. I might go back if they come out with another flash/recall.
Reaching those outlets doesn't look easy though.
03-10-2007, 11:06 AM
#118
ReDuX
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^^^^ yeah no f@ckin joke @ all.........So after seeing my intake temps reach 100+ on a 70 degree day I decided to go on ahead and try out this mod, it is beyond a PIA to get to that coolant hose on the bottom of the throttle body even w/intake removed...I ended up just cutting the damn hose...
03-17-2007, 12:26 PM
#120
Registered
yes please more pictures and detailed description. Ive been wanting to do this myself for months, but the pictures for the install are no good! Anybody wanna help on this?
03-17-2007, 12:41 PM
#121
Originally Posted by rowteree
yes please more pictures and detailed description. Ive been wanting to do this myself for months, but the pictures for the install are no good! Anybody wanna help on this?
http://rotaryinsider.com/rx8-59.html
03-17-2007, 01:26 PM
#122
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^^^Nice write up. I found that removing the throttle body(4 x 10mm nuts) all together made this task much easier. While I was at, I clean that bugger cause it was coated in black, gunky stuff. It removes easily with some carb cleaner and a rag.
04-07-2007, 01:52 PM
#124
Destroying Threads
I just did this mod today........however I used the stock clamp for the bottom clamp since i sucked too bad to reach down there anyways............do you think it would come undone? I'm kinda scared..........
04-09-2007, 10:43 PM
#125
hukbong himpapawid
I re-did this a few weeks ago when I drained my coolant and installed the Sohn OMP adaptor. but instead of connecting the coolant lines together, I capped both outlets with arubber vacuum cap and a hose clamp. I removed the upper intake manifold to gain access to the one by the firewall. I'm not worried about the rubber bursting under pressure since I'm using evans NPG-R.
