suprabrown Posted June 17, 2005 Share Posted June 17, 2005 Does anyone know how the TC works on the VVTi? Does it close off the air intake to limit the power? I'm asking cus I've had an e-mail from powerhouse racing saying they normally disconnect the butterfly valve on the stock TT to remove TC & speed limiter........... I'm wondering if I can do the same on the VVTi,,,,,,,,ideas anyone? If the car was outside I'd go and take a look to see if there is another butterfly vale on the throttle body Sorry if it's all been covered, I've had a quick search but diddn't find anything. cheers, markb Link to comment Share on other sites More sharing options...
JustGav Posted June 17, 2005 Share Posted June 17, 2005 The VVTi traction control links into the fly by wire throttle control, so you can't remove any butterfly... I've put a relay into my car which just pulses the switch when you turn the car on, as you can't just remove the switch either... Bit of issue, but I'm trying to find a decent way to remove it as well... Gav Link to comment Share on other sites More sharing options...
JohnA Posted June 17, 2005 Share Posted June 17, 2005 The VVTi traction control links into the fly by wire throttle control, so you can't remove any butterfly... very 'big brother' eh Gav? Link to comment Share on other sites More sharing options...
JustGav Posted June 17, 2005 Share Posted June 17, 2005 I don't mind... the FBW adds a lot of nice features... Knock control... Smoothes out acceleration.. Traction control (altho I turned it off) And some other stuff I'm sure I've not found yet *grin* Gav Link to comment Share on other sites More sharing options...
Gaz Walker Posted June 17, 2005 Share Posted June 17, 2005 You can buy proper VSC off switches in Japan for the Aristo (same engine) but I've not seen an app for the Supra. They aren't cheap at £250+ though. The switch turns the traction off but the VSC still turns on when you get it really horribly wrong! Gaz. Link to comment Share on other sites More sharing options...
JohnA Posted June 17, 2005 Share Posted June 17, 2005 I don't mind... the FBW adds a lot of nice features... Knock control... So if it thinks there's knock it closes the throttle, right? So if you go "full throttle" right afterwards, will it open the throttle fully, or keep it half-closed 'for your own good'? In any case, why couldn't they have the TC throttle close on the 'normal' versions then, instead of just retarding the ignition? Link to comment Share on other sites More sharing options...
Guest Terry S Posted June 17, 2005 Share Posted June 17, 2005 So if it thinks there's knock it closes the throttle, right? So if you go "full throttle" right afterwards, will it open the throttle fully, or keep it half-closed 'for your own good'? In any case, why couldn't they have the TC throttle close on the 'normal' versions then, instead of just retarding the ignition? I have seen logs where it has shut my throttle to 50% and opened it back up to 100% so fast that I didnt even know it had happened. This obviously depends on what it senses. But from my experience it will give 100% back as soon as it feels its safe to. Link to comment Share on other sites More sharing options...
suprabrown Posted June 17, 2005 Author Share Posted June 17, 2005 Gaz, sorry for the ignorance, what is a VSC off switch? Does it do anything for the speed limiter? That's what I'm really trying to cure, the kick down at say 130+!!! I've also sent an e-mail to Top Secret, to see if they know of any ways round this. cheers Link to comment Share on other sites More sharing options...
JohnA Posted June 17, 2005 Share Posted June 17, 2005 I have seen logs where it has shut my throttle to 50% and opened it back up to 100% so fast that I didnt even know it had happened. ... cool... why couldn't they incorporate this behaviour in the TC of the older models then? It's such a joke that TC... Link to comment Share on other sites More sharing options...
Guest Terry S Posted June 17, 2005 Share Posted June 17, 2005 cool... why couldn't they incorporate this behaviour in the TC of the older models then? It's such a joke that TC... No Idea John, you are right the stock TC is a joke, but the VVTi TC is pretty intrusive too. We need to do more work on mine as I cant get full throttle in 1st from mine from a standing start. You can tell as when you get full throttle the exhaust note deepens considerably. I am sure we'll suss it soon. Link to comment Share on other sites More sharing options...
Gaz Walker Posted June 17, 2005 Share Posted June 17, 2005 Gaz, sorry for the ignorance, what is a VSC off switch? Does it do anything for the speed limiter? That's what I'm really trying to cure, the kick down at say 130+!!! I've also sent an e-mail to Top Secret, to see if they know of any ways round this. cheers Vehicle Stability Control off - it fully removes all the functions of the traction system. I don't think the VVTi Supra has VSC system however, just traction. In my car even if you have the system off, if you get the car very sideways it will cut in instantly and you get 5 cheeps for a buzzer on the dash. Regards, Gaz. Link to comment Share on other sites More sharing options...
JustGav Posted June 17, 2005 Share Posted June 17, 2005 I have to defer to Terry's judgement on the VVTi TC stuff as well... I've not had a chance to really push my car yet as I've not setup the AFR's yet, but I reckon I will have a similar issue... Gav Link to comment Share on other sites More sharing options...
Darren Posted June 17, 2005 Share Posted June 17, 2005 I had problems with mine on an RR refusing to give full throttle..very frustrating Link to comment Share on other sites More sharing options...
JohnA Posted June 18, 2005 Share Posted June 18, 2005 I've had the same with a friend's VVTi on the rollers. Throttle shutting for no obvious reason. So much for those here preaching (offensively too) that the VVTi is as tuneable as the other TT versions. It isn't. Mr "T" fights back harder on these... Link to comment Share on other sites More sharing options...
JustGav Posted June 18, 2005 Share Posted June 18, 2005 John, I wouldn't say it isn't as tuneable... : Just has some more gotcha's with it *grin* Gav Link to comment Share on other sites More sharing options...
JohnA Posted June 18, 2005 Share Posted June 18, 2005 Well how could it be as tuneable if it's got more 'gotchas' and hurdles? Plus it's on the newest cars, so probably less time/effort has been spent on "fiddling" with them. Link to comment Share on other sites More sharing options...
JustGav Posted June 18, 2005 Share Posted June 18, 2005 so probably less time/effort has been spent on "fiddling" with them. That is so true, since they are newer vehicles, most companies have not spent anywhere near the same amount of time with them hence the lack of info on them.. But then we all like a challenge *grin* Link to comment Share on other sites More sharing options...
JohnA Posted June 18, 2005 Share Posted June 18, 2005 If I were to buy another supra, it would be a VVTi. I just love the idea of not having to compromise intake cam position for midrange or low/high revs. It is *so* important for tuned turbos... (as for the drive-by-wire, I'm no so sure...) Link to comment Share on other sites More sharing options...
Guest Terry S Posted June 18, 2005 Share Posted June 18, 2005 It only ever shuts the throttle for a reason, not out of spite Link to comment Share on other sites More sharing options...
JohnA Posted June 18, 2005 Share Posted June 18, 2005 Terry, you're right, it's just that I'm always sceptical of such actions behind the scenes 'for your own good' As you know the UK TC not only plays with the stupid flap and retards the ignition at will, it also applies the brakes FFS. I have a VERY slow right turn here where I live that has slightly negative camber. I applies the brakes and cuts most power even at below 10mph for crying out loud, it's like an overprotective mother. Link to comment Share on other sites More sharing options...
Darren Posted June 18, 2005 Share Posted June 18, 2005 It only ever shuts the throttle for a reason, not out of spite Its finding out thats the problem???!!! I was told at one stage that I needed a new ECU. The VVTIs have been on a steep learning curve when I got mine you couldn't even get an FCD to work on it! Link to comment Share on other sites More sharing options...
Guest Terry S Posted June 20, 2005 Share Posted June 20, 2005 Darren, you are right that is 99% of the battle. That was the reason I got a VVTi, to try and learn about them. John, you should try a VVTi in Snow mode, different class Link to comment Share on other sites More sharing options...
Chris Wilson Posted June 20, 2005 Share Posted June 20, 2005 As far as I bothered to investigate it would appear that converting FBW throttle to normal cable operation, when using an aftermarket ecu, is as simple as swapping in the throttle body from an earlier none VVTi car. I think even the VVti throttle cable will fit the early throttle bodies? Link to comment Share on other sites More sharing options...
JohnA Posted June 20, 2005 Share Posted June 20, 2005 .John, you should try a VVTi in Snow mode, different class Snow mode, lol... I wouldn't want to use mine in the damp/wet, let alone snow... Link to comment Share on other sites More sharing options...
Chris Wilson Posted June 20, 2005 Share Posted June 20, 2005 Snow mode, lol... I wouldn't want to use mine in the damp/wet, let alone snow... Might as well sell it for what good it'll be in the UK then I just LOVE racing in the wet. Link to comment Share on other sites More sharing options...
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