Why can't I spin the tires off the line
05-15-12, 08:39 AM
#31
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There is a fuse for it. Pull it (if equipped) and TRAC goes away.
Realistically, you've done a bunch of mods that don't improve power. The exhaust is a nice step in the right direction but the ONLY way to "spin wheels" is to either increase power, or decrease traction. The 1UZ heads are fairly poor flowing. Bolt ons don't provide many gains for such a large motor and the automatic eats up a solid ~25% percent of your total power.
Realistically, you've done a bunch of mods that don't improve power. The exhaust is a nice step in the right direction but the ONLY way to "spin wheels" is to either increase power, or decrease traction. The 1UZ heads are fairly poor flowing. Bolt ons don't provide many gains for such a large motor and the automatic eats up a solid ~25% percent of your total power.
05-15-12, 08:46 AM
#32
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Do you know where the fuse is located? I was reading on other forums and they said there is a fuse on the driver's side in the engine compartment and there are supposed to be four relays in the box. I can only find two, so it SEEMS like trac shouldn't be on, but for whatever reason it is.
05-15-12, 08:51 AM
#33
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can you get a hold of the wire diagram for it? there has to be a remote wire that activates it from the computer just cut that. also the fuse might be shared with other equipment so it might be hard to take that fuse out. i use to do that with the speed limiter, there wasnt a particular fuse so i went straight to the source that told it when to come on and cut it.
05-15-12, 09:11 AM
#34
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ECU diagram
http://www.lextreme.com/PDF/scecu2.pdf
Correct me if I'm wrong, but it looks like I need to cut pins 37-40??? It also looks like there's more on pin 69. I can't really tell and I'm not sure what else cutting these wires might affect.
http://www.lextreme.com/PDF/scecu2.pdf
Correct me if I'm wrong, but it looks like I need to cut pins 37-40??? It also looks like there's more on pin 69. I can't really tell and I'm not sure what else cutting these wires might affect.
05-15-12, 10:13 AM
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I don't see anywhere to disable it at the throttle body. I only have one plug by the butterfly. However I do have another thing down by the fender that has a cable on it. Is this the trac for this car? I pulled off a cable that ran to the throttle body and did notice that acceleration was BETTER, but still no tire smoking. What is this I just did?
05-15-12, 10:25 AM
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looks like pin 17 the white wire, can you trace that wire back to the unit to verify. dont start cutting up wires, try to be very sure first. trace the harnes from the computer and follow it to the trac box
05-15-12, 10:30 AM
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In the mean-time, I'll see what else I can do in the engine compartment to disable it.
BTW thanks for staying on this thread with me. It's always nice to have a little help.
Edit: I'm not sure how you're seeing Pin 17 as being the TRAC. Maybe I'm reading it wrong.....
Last edited by ajmccarrel; 05-15-12 at 10:35 AM.
05-15-12, 11:14 AM
#39
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I see it now...... I'll look at my ECU later this evening and get back to you. I'll see if this makes sense.
05-15-12, 01:07 PM
#40
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yeh just think it out first, you just want to interupt the signal, even putting a switch is a better idea to not loose the function totally. im just recently learning about these cars, i blew my navi, heat ac, and power mirrors installing a system. nobody could find out what it was, lexus was telling me i might need a new module that cost 4,100 bucks. i got the wire diagram, and traced each thing that was out to one spot on the fuse block. upon taking it down i found melted plastic from the fuse coating the terminal, i cleaned it put it back together and everything came back on. the only thing with you is couldnt tell you if its really your traction control or just a power loss. try this get some oil and poor it under your tires and power brake it to see if it breaks ground, if the motor seems like its shutting down then the traction is on, if it spins then you just have a drivetrain or power loss some where.
05-15-12, 02:14 PM
#41
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yeh just think it out first, you just want to interupt the signal, even putting a switch is a better idea to not loose the function totally. im just recently learning about these cars, i blew my navi, heat ac, and power mirrors installing a system. nobody could find out what it was, lexus was telling me i might need a new module that cost 4,100 bucks. i got the wire diagram, and traced each thing that was out to one spot on the fuse block. upon taking it down i found melted plastic from the fuse coating the terminal, i cleaned it put it back together and everything came back on. the only thing with you is couldnt tell you if its really your traction control or just a power loss. try this get some oil and poor it under your tires and power brake it to see if it breaks ground, if the motor seems like its shutting down then the traction is on, if it spins then you just have a drivetrain or power loss some where.
It also could be that I have my stock mufflers bolted on right now, because I'm waiting on my new Magnaflows. They might be too restrictive and that might be contributing, since the rest of the system is 2.5 and these are 2.25 stock bolted on.
You're a VERY brave man for tracking down that melted plastic issue! I never would have attempted something like that.
05-15-12, 03:11 PM
#42
Two TPS sensors is a give away that you had Traction Control.
What headers do you have installed? Headers are a big restriction, I'll be honest with you, even with my 5 speed swap, I can't get it to chirp tires or anything. Though I've never really tried to do a burn out or donut. Us 1UZ guys are always searching to make more power, so if there was a way to do it, it'd probably been documented somewhere.
Oh, also try to reset your ecu (in the engine bay fuse box, there's a fuse labeled EFI, should be a 20 amp), and let it sit for a few minutes and try it again.
Our computers are slightly self learning, so it tries to keep it nice and smooth, all luxury like. You might want to look into getting a SAFC for a tune. It does pretty well for a cheap unit.
What headers do you have installed? Headers are a big restriction, I'll be honest with you, even with my 5 speed swap, I can't get it to chirp tires or anything. Though I've never really tried to do a burn out or donut. Us 1UZ guys are always searching to make more power, so if there was a way to do it, it'd probably been documented somewhere.
Oh, also try to reset your ecu (in the engine bay fuse box, there's a fuse labeled EFI, should be a 20 amp), and let it sit for a few minutes and try it again.
Our computers are slightly self learning, so it tries to keep it nice and smooth, all luxury like. You might want to look into getting a SAFC for a tune. It does pretty well for a cheap unit.
05-15-12, 05:33 PM
#43
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Two TPS sensors is a give away that you had Traction Control.
What headers do you have installed? Headers are a big restriction, I'll be honest with you, even with my 5 speed swap, I can't get it to chirp tires or anything. Though I've never really tried to do a burn out or donut. Us 1UZ guys are always searching to make more power, so if there was a way to do it, it'd probably been documented somewhere.
Oh, also try to reset your ecu (in the engine bay fuse box, there's a fuse labeled EFI, should be a 20 amp), and let it sit for a few minutes and try it again.
Our computers are slightly self learning, so it tries to keep it nice and smooth, all luxury like. You might want to look into getting a SAFC for a tune. It does pretty well for a cheap unit.
What headers do you have installed? Headers are a big restriction, I'll be honest with you, even with my 5 speed swap, I can't get it to chirp tires or anything. Though I've never really tried to do a burn out or donut. Us 1UZ guys are always searching to make more power, so if there was a way to do it, it'd probably been documented somewhere.
Oh, also try to reset your ecu (in the engine bay fuse box, there's a fuse labeled EFI, should be a 20 amp), and let it sit for a few minutes and try it again.
Our computers are slightly self learning, so it tries to keep it nice and smooth, all luxury like. You might want to look into getting a SAFC for a tune. It does pretty well for a cheap unit.
05-15-12, 05:46 PM
#44
If you don't have that butterfly, you DO NOT have traction control. That's how the car handles traction control. No butterfly = no way for it to reduce power.
The thing you unplugged is the cruise control motor.
The thing with the red circle in both pics is a beauty cover. It is present on cars with or without traction control.
The thing you unplugged is the cruise control motor.
The thing with the red circle in both pics is a beauty cover. It is present on cars with or without traction control.