Bypassing the throttle body
#16
this is the mod you wouldn't want to do in cold climate states. The hot coolant run throught the TB to warm up the TB and the butterfly wouldn't seize up due to the cold. If you live down south then this is the mod worth doing. You don't need a kit for it and i doubt it will gain 8 horse power, maybe 8 rat power .
#17
I used to own an ls1 Z-28, they have the same engine as the'98 to '04 Corvettes. This question has been asked a million times over on the ls1 and Corvette forums. The answer is usually 1-2HP if any but everbody does it! No one has ever ( as far as I have seen) had there throttle blade freeze up but that's why the coolant run's through the Tb. If you wanted to go and search you can try LS1tech.com or Corvetteforum.com and search there. The 'Vette's have fly by wire like our car's. I guess what I am rambling on about is, it won't really make any difference one way or the other.
#19
I did this on my Corvette. Living in Hawaii, icing is not a problem. It cost me about $2. All you do is bypass the throttle body. I just used a longer hose. Took about five minutes. Did it help? Who knows, kind of like everything we are now trying on the Lexus, depends on who you ask.
Aloha
Aloha
#20
Aloha,
Larry
#23
I've done this mod on 4 cars.
Didnt make enough HP to feel a difference at all. Although the throttle body is cooler to the touch now. I would also think that eventually (long drives) heat soak from the manifold will bring the TB temp up anyway. In the case of long drives the coolant may actually help keep the TB temp down.
IMO The amount of time the air is in the throttle body does not allow for TB to intake air heat soak. I would'nt do it to my lex. Then again I havnt done anything to her, performance-wise.
For those who want to try it and live in areas with winters. It takes about 2 minutes to do so you can return it to normal for freezing temps. You could even buy a small valve so you can just open your hood turn the valve, bam back to stock.
Didnt make enough HP to feel a difference at all. Although the throttle body is cooler to the touch now. I would also think that eventually (long drives) heat soak from the manifold will bring the TB temp up anyway. In the case of long drives the coolant may actually help keep the TB temp down.
IMO The amount of time the air is in the throttle body does not allow for TB to intake air heat soak. I would'nt do it to my lex. Then again I havnt done anything to her, performance-wise.
For those who want to try it and live in areas with winters. It takes about 2 minutes to do so you can return it to normal for freezing temps. You could even buy a small valve so you can just open your hood turn the valve, bam back to stock.
Last edited by Heltah; 01-15-07 at 01:34 PM.
#24
I've done this mod on 4 cars.
Didnt make enough HP to feel a difference at all. Although the throttle body is cooler to the touch now. I would also think that eventually (long drives) heat soak from the manifold will bring the TB temp up anyway. In the case of long drives the coolant may actually help keep the TB temp down.
IMO The amount of time the air is in the throttle body does not allow for TB to intake air heat soak. I would'nt do it to my lex. Then again I havnt done anything to her, performance-wise.
For those who want to try it and live in areas with winters. It takes about 2 minutes to do so you can return it to normal for freezing temps. You could even buy a small valve so you can just open your hood turn the valve, bam back to stock.
Didnt make enough HP to feel a difference at all. Although the throttle body is cooler to the touch now. I would also think that eventually (long drives) heat soak from the manifold will bring the TB temp up anyway. In the case of long drives the coolant may actually help keep the TB temp down.
IMO The amount of time the air is in the throttle body does not allow for TB to intake air heat soak. I would'nt do it to my lex. Then again I havnt done anything to her, performance-wise.
For those who want to try it and live in areas with winters. It takes about 2 minutes to do so you can return it to normal for freezing temps. You could even buy a small valve so you can just open your hood turn the valve, bam back to stock.
Regarding the valve thing, I think you would have to rig up more than just one valve since you can't just block the line. The valves would have to reroute the coolant.
#25
The 4A-GE came from the factory with a thermostat in the throttlebody to control coolant flow. I haven't looked that deeply into the drive by wire units, but it wouldn't surprise me at all if there is also a thermo controlled valve in them.
Time to do some research...
Time to do some research...
#26
The 4A-GE came from the factory with a thermostat in the throttlebody to control coolant flow. I haven't looked that deeply into the drive by wire units, but it wouldn't surprise me at all if there is also a thermo controlled valve in them.
Time to do some research...
Time to do some research...
Actually 2 switched valves work better.
hose to TB
*switchable Y-valve
*length of hose
*switchable Y-valve
hose from TB
turn on off as you please
Of course Im no mechanic!!
Last edited by Heltah; 01-15-07 at 03:59 PM.
#27
There's nothing in the documentation indicating there is a thermo valve on the throttlebody.
I've been looking at other models to see if there is any reason to believe it might be, but I'm also not finding anything on it. My '88 GTS Corolla with the 4A-GE definitely had a thermo valve and had procedures in the FSM for testing the valve's operation. If I had one in hand...oh well...not worth breaking the cooling system just for that.
I've been looking at other models to see if there is any reason to believe it might be, but I'm also not finding anything on it. My '88 GTS Corolla with the 4A-GE definitely had a thermo valve and had procedures in the FSM for testing the valve's operation. If I had one in hand...oh well...not worth breaking the cooling system just for that.
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