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The mkiv Supra Owners Club

A few Questions about removing the "Trac fuse" on a UK spec!


Kevin Huntley

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Hi all, I am hoping to run my car at Elvington this weekend after fitting my latest mods (RLTC, HKS EVCIV, FCD & Downpipes) and I have a few questions about removing the "TRAC" fuse which I am hoping will allow me to reach speeds in excess of the limited 155 mph.

 

1) Is it safe to do so on a UK spec car?

 

2) How do you do it? detailed instructions would be nice, ie start by telling me where the fuse box is located?:D

 

3) Am I right in saying that by removing this fuse the stock traction control will be disabled and the 155mph limit will be removed?

 

4) Any side effects I need to know about?

 

5) As a result of removing the fuse will this stop me having to turn off the stock Traction control off everytime I get into the car to enable the RLTC to work which is becoming annoying?

 

Thanks

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Guest Martin F

1. Yes

 

2. Front right of engine bay directly behind the battery is the fuse box in question. Lift the lid and inside the lid is a legend showing which fuse is which. Should be easy enough to figure out. Maybe somebody else can tell you exactly which fuse number.

 

3. Yes

 

4. No, not on a manual car.

 

5. Yes.

 

Hope that helps.

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Guest Martin F

The auto's also close the sub-throttle plate (trac control throttle plate) on gear shift's. If you remove the trac fuse this will no longer happen, causing shifts to be harsher and possibly reducing the life of the auto box. But to what extent the life is reduced is open to debate.

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Originally posted by Martin F

The auto's also close the sub-throttle plate (trac control throttle plate) on gear shift's. If you remove the trac fuse this will no longer happen, causing shifts to be harsher and possibly reducing the life of the auto box. But to what extent the life is reduced is open to debate.

 

cheers martin, you replied as i was typing my reply! you say it may reduce the life of the box? is this a common side effect? or only occurs after a long time or on big power cars?

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The Auto's have a feature called Maunal Mode (small button with the word MANU) on it.

 

Switching this on means you can change between the first 3 gears (L,2,D) like a manual car, so it wont shift until you move the gear lever. Having this on also removes the overdrive option, but you can switch it on and off at the press of a button right next to the gear lever.

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Guest Martin F
Originally posted by Dave R

 

cheers martin, you replied as i was typing my reply! you say it may reduce the life of the box? is this a common side effect? or only occurs after a long time or on big power cars?

 

It is a theoretical side effect, AFAIK nobody has done any practical measurements to see what the effect is in real life. But the reason that Toyota designed this feature in was to stop straining the box during shifts, so logic tells you that removing it will cause more strain.

 

I've not heard anybody putting failure of a box down to removing the trac fuse, but that's not to say it wouldn't happen over time.

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Originally posted by Martin F

 

It is a theoretical side effect, AFAIK nobody has done any practical measurements to see what the effect is in real life. But the reason that Toyota designed this feature in was to stop straining the box during shifts, so logic tells you that removing it will cause more strain.

 

I've not heard anybody putting failure of a box down to removing the trac fuse, but that's not to say it wouldn't happen over time.

 

cheers for this, its quite intimidating to ask a relatively basic question on here sometimes! just trying to take in as much as possible before buying mine.

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Originally posted by Dave R

 

cheers for this, its quite intimidating to ask a relatively basic question on here sometimes! just trying to take in as much as possible before buying mine.

 

That's odd, Martin is apparently well known for being intimidating and unhelpful - I don't know what he's doing wrong lately :D

 

-Ian

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Guest Martin F
Originally posted by Ian C

 

That's odd, Martin is apparently well known for being intimidating and unhelpful - I don't know what he's doing wrong lately :D

 

-Ian

 

:moo:

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Originally posted by Dave R

 

cheers for this, its quite intimidating to ask a relatively basic question on here sometimes! just trying to take in as much as possible before buying mine.

 

Yeah,

 

I bit like Kevin and his auto/manual clutches ;)

 

Or did you think we had forgot about that? ;)

 

Gaz.

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Originally posted by Kevin Huntley

Hi Gaz, Don't bring that old chestnut back up again, I don't think I will ever live it down, Very embarrasing:rolleyes:

 

When did you fit a SS Bov, Anygood?

 

Well, its not strictly fitted yet, more like sitting on desk waiting to be fitted ;)

 

I am unsure as to how to fit actually as I dont have the fitting kit and RaceLogic won't sell me one :(

 

I am going to get a flange for it from somewhere and weld it to a hardpipe when I get one...

 

Gaz.

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