Matt Harwood Posted September 1, 2003 Share Posted September 1, 2003 Try putting the 7.5a fuse back in... That way you should see both trac lights illuminate when you first turn the ignition on. Maybe the installer removed the bulb from the 'trac off', to stop it flashing... Quote Link to comment Share on other sites More sharing options...
far Posted September 1, 2003 Author Share Posted September 1, 2003 Maybe the installer removed the bulb from the 'trac off', to stop it flashing... Cheer Mat - but when I hit the "trac off" switch then the orange light illuminates so I think he hasnt toucehd the bulb - I do know thought that both the lights dont come on when you switch the ignition on - just the orange one Quote Link to comment Share on other sites More sharing options...
Terminator Posted September 1, 2003 Share Posted September 1, 2003 Far, I suggest you take a friend in the car to watch the screen and use Grahams app to see if cut is being induced. Give the car some stick in first with the RL unit switched to WET it should not take much to get the system to kick in and leave a cut trace and you will see the revs drop at the same time. It sounds like your stock TC is still active if you get the orange light come on. Have you checked the fuse? Quote Link to comment Share on other sites More sharing options...
far Posted September 1, 2003 Author Share Posted September 1, 2003 Cheers term - I will check this with a mate - It sounds like your stock TC is still active if you get the orange light come on. Have you checked the fuse Not yet but I will do this tonight - but surely if the stock TC was still active I wouldn't be able to drive around with both systems running - I think the next thing to do,as you said is check out the fuse. Quote Link to comment Share on other sites More sharing options...
Doughie Posted September 1, 2003 Share Posted September 1, 2003 OK let's ignore RLTC for a second : If you pull the TRAC fuse, you will have disabled the stock TC, BUT it's my understanding that the "TRC" lights on a Jap-spec will still flash when traction is lost but since the TRAC fuse is pulled, it can't reduce the engine power any more (via the throttle butterflies). so it is still MONITORING when traction is lost (and the stock TC is set to 0% slip) but it can't do anything about it any more. With RLTC, just pull the TRAC fuse and it eliminate the systems clashing. There's nothing dangerous or wrong with the systems clashing, and it won't stop you driving anywhere as normal. RLTC reacts so much more quickly (and subtley) than the stock TC. The only situation i cna think of where the stock TC could cut in with RLTC installed, is if you select more than 0% slip. I never tried it, cos i always had the TRAC fuse pulled (even before i got RLTC installed.....) As Termy has said, there are all kinds of parameters you can change on the DAT file, via Graham's app. There are 3 levels of "cut" (this is fuel-cut, i.e. one of the cylinder's fuel injector pulse is "skipped" thereby meaning no power from that cylinder for that crankshaft rotation) : Soft cut : 5% slip + what's dialled in + 5% if in straight-line Medium Cut : 10% slip + what's dialled in+ 5% if in straight-line Hard Cut : 15% slip + what's dialled in + 5% if in straight-line Soft cut will cut 1 cylinder per crank cycle, medium is set to cut 2 cylinders (if I remember correctly) and hard-cut is set to cut 3 or 4 cylinders. all of this is user-configurable. i.e. you can tell it which cylinder to cut, how many for each level of cut etc.etc. So as i understand it, say you're cornering and you've selected 5% rear-wheel slip (RLTC options as we know are 0%, 5%, 10%, 15%, 20%, OFF) then the system will allow (whilst cornering) 10% rear-wheel slip BEFORE "soft-cut" is invoked. (5% dialled in, + the additional 5% before soft-cut happens.). If soft-cut fails to prevent the rear-wheels spinning up (say you hit some diesel fuel or something) then when rear-slip hits 15% then medium-cut happens, and then "hard-cut" after that. Obviously the more cut, the fewer cylinders are getting any fuel and the less power the car produces. The one BIG advantage over the stock TC is that RLTC happens VERY quickly, and equally important, stops reducing engine power very quickly once the rear wheels are no longer spinning above the allowable levels. the Cut-levels are noticeable but you just don't get the horrible "zero power for ages" feeling of stock cut. In practice all you do is play with the dialled in levels until you're happy with a setting in the dry, and happy with a certain setting in the wet etc. phew, think that's it. sorry for a long post. I got quite into the mechanics of RLTC when i had my Supra but Phils' more uptodate than i am these days. Quote Link to comment Share on other sites More sharing options...
Roy Posted September 1, 2003 Share Posted September 1, 2003 phil - picking up on this, i had your DAT file ready for download after the RLTC unit was installed but never got around actually downloading the file you sent me (something to do with my not being able to wait getting in the car and giving it the boot! ) and i have not as yet downloaded yours either. i remember taking a ride in matt harwoods previous car and i saw how his unit worked with the power cut and all that in the wet and i seriously think the stock settings (which are in mine now) are are eerily similar to what i experienced in his car. how far in 'seat-of-the-pants' feeling should the stock settings be from matt's obviously optiomised settings... maybe a good idea to down load yours and get that other stuff checked out (ie tyres and ABS pulse) ... Quote Link to comment Share on other sites More sharing options...
far Posted September 1, 2003 Author Share Posted September 1, 2003 Phil,Doughie + others as usual this is top notch info - after discussions I have found( as Termy diagnosed) the trac fuse was not actually removed at all ! As far as I rememember the green "trac cont on" light has only come on twice,now after reading that you can actually drive normally without always hitting the trac off switch I think I may have forgotten to press it as part of the normal start up sequence DOH ! OK now I need to do the final test of checking the system with the aid of mate+lappy. One quick question - as long as I turn TC off as part of the start up sequence I dont have to remove the trac fure right ? and everything should work as normal and stock TC will be disabled allowing RLTC to work to its fullest potential ? Quote Link to comment Share on other sites More sharing options...
Terminator Posted September 1, 2003 Share Posted September 1, 2003 RLTC will always work to its fullest potential as long as it is switched on. As Stu says stock TC can work with it and if you drive reasonable gently you will never have the stock system cut in. However when you drive harder problems can arise as you approach levels of slip that with trigger higher levels of cut in the RL system. The stock system cuts in and does its full power cut and finally lets you have power back a few seconds later, but this stops RLTC working effectively. AFAIK RL monitors and reacts at the rate of 40 times a second so while stock TC is messing about you have lost over 120 possibilities for RL to control the slip. If you have RLTC there is simply no need for the stock system. Either disable it or make turning it off on of your start up routines. Roy, RL is so good even with some pretty bad dat files it does work. If you talk to Matt I am sure he will tell you what he noticed. All my files do is utilise all the facilities you have paid for and match the system to the MKIV not any old 6 cylinder car. Quote Link to comment Share on other sites More sharing options...
SimonB Posted September 1, 2003 Share Posted September 1, 2003 When you pull the trac fuse on a J spec at least it stops the trac system doing anything, monitoring or otherwise. As a warning that something has gone wrong and you no longer have any traction control the orange "trac off" light flashes constantly, which is very annoying if you took the fuse out deliberately. To get round this you take the bulb out! The green light comes on to indicate the system is cutting power, and shouldn't come on either with the system off or with the fuse out. I actually took the entire trac ECU out when I installed my RLTC, because I wanted to put the RLTC ECU in the same place. But I'd pulled the stock TC fuse ages before because it was annoying me... Quote Link to comment Share on other sites More sharing options...
Matt Harwood Posted September 2, 2003 Share Posted September 2, 2003 Roy, when I first got mine installed, I was very impressed by it. However, after Phil had altered the settings, the system worked so much better. It was a lot smoother to start with, previously, I seemed to only have the hard cut. It was also much quicker to react and really did inspire a lot more confidence. - Enough for me to really enjoy exiting a roundabout at WOT in the rain ... Disclaimer:- I'm not suggesting anyone actually try this to test the RLTC! Phil, if you don't mind, I'll wait until the weather gets consistantly wetter, and pop up to see you. I'd like to see if the settings can be tuned to suit the manual better.... Not that I'd know how to do it! Re. trac fuses... On the auto, people might want to leave the trac fuse in as the electronic throttle control system also uses the traction butterfly to partially close the throttle on gearchange, making a much smoother change. - On the other hand, remove it drag runs etc, as you'll get full power gearchanges. I'm 99% sure this doesn't happen on the manuals, so pulling the fuse shouldn't have any untoward side-effects... Quote Link to comment Share on other sites More sharing options...
far Posted September 2, 2003 Author Share Posted September 2, 2003 Thats great advice guys - think im just gonna turn off the stock TC on ignition instead of pulling the trac fuse & bulb - im getting used to this process anyway as part of the startup sequence and if I forget my GF presses the button for me Termy - you comin to the supra gumball ? I owe you a beer or three Quote Link to comment Share on other sites More sharing options...
Roy Posted September 2, 2003 Share Posted September 2, 2003 phil/matt - thank you. i guess i will just have to download these optimised files and check out the difference. have you made any changes to the auto files ie as in further update since march ? Quote Link to comment Share on other sites More sharing options...
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