Guest Usmann A Posted July 4, 2005 Share Posted July 4, 2005 IIRC, the Vvti, has 3 pulses off the inlet cam, so its like the resolution is greater in the map, I know that the cam hall sensor triggers everytime cylinder no1 is at TDC. so it refrences it for ign and seq fueling, but the 3 pulses? Possible that wasted spark ign. triggers .., im unsure, possible for vvti? or just greater speed definition of the motor? Any hoo, good stuff tel,that rebuild was quick ... Quote Link to comment Share on other sites More sharing options...
Guest Terry S Posted July 4, 2005 Share Posted July 4, 2005 few more Quote Link to comment Share on other sites More sharing options...
Wez Posted July 4, 2005 Share Posted July 4, 2005 It's a bit of an assumption, but it suggests that the stock rev limit could be raised to the same level by pluggin in VVTi bits. How do the stock cam profiles compare, VVTi to non? Do you know whether Toyota changed the valve spring and tappet stack height for the VVTi? Are the cam base circles the same? Any idea if the valvetrain was lightened in the VVTi? (Long shot, I know). If the stack height and profiles are similar, then maybe VVTi springs could run in a non-VVTi to make te valvetrain safe up to 7200. I have been told that the non VVTI engine can also rev to 7200, but without upgrading the cams you would gain nothing, the basemaps on the AEM have ignition cut at 7200 and then fuel cut at 7400. With a built head people rev them too 8000 and higher, not so sure I would like to try that though. Quote Link to comment Share on other sites More sharing options...
Wez Posted July 4, 2005 Share Posted July 4, 2005 Wasted Spark ignition. This IMO is a step backwards to coil on plug. The coil on plug setup is awsome, do they run normal remote coils and ignition leads on the VVTI? Quote Link to comment Share on other sites More sharing options...
Guest Terry S Posted July 4, 2005 Share Posted July 4, 2005 I have been going to 7500 rpm. Quote Link to comment Share on other sites More sharing options...
Wez Posted July 4, 2005 Share Posted July 4, 2005 I have been going to 7500 rpm. In the VVTI or normal? Quote Link to comment Share on other sites More sharing options...
Digsy Posted July 4, 2005 Share Posted July 4, 2005 I can't post the whole thing because it's copyrighted material. But this sums it up really: http://www.max-boost.co.uk/stuff/VVTi.gif Slight John, that document certainly is a good find. I have most of the non-VVT-i related documents on a CD but AFAIK "official" technical info on the VVT-i is pretty rare. Its even rarer to find someone posting up previously unsees documents on here these days. If you can't post it all, can you tell us where you got that from? I'm still amazed than an engine of the VVT-i Supra's vintage has an infinitely variable cam phaser on it. Quote Link to comment Share on other sites More sharing options...
JustGav Posted July 4, 2005 Share Posted July 4, 2005 TBH, I think we need to start getting some VVTi info and just go public with it... I've got things such as wiring diagrams for them.... and if others are willing to post info to help out the greater good then yes I would go public as well, but I have a real problem with people just sponging info and not sharing bits they have (not aimed at you john, because I've seen how much you have put on your site) Gav Quote Link to comment Share on other sites More sharing options...
Soonto_HAS_soop Posted July 4, 2005 Share Posted July 4, 2005 Thanks for all of this Terry, one of the best new threads I've seen for a long time. Quote Link to comment Share on other sites More sharing options...
Ian C Posted July 4, 2005 Share Posted July 4, 2005 How the bloody hell is a technical description of the VVTi system copyright material? Why not retype it and pass it off as your own? I'm sure that'd get around any potential accusations of copying stuff. -Ian Quote Link to comment Share on other sites More sharing options...
Ian C Posted July 4, 2005 Share Posted July 4, 2005 Oh no, hang on, here we go: http://autospeed.drive.com.au/cms/article.html?&A=1283 See the section headed "The Advantage of VVT-i " for where JohnA copied the text from Still don't understand the copyright issue going on there, hey ho. Edit - shame they got the redline wrong, it's 7200rpm as Terry has found out, not 6800 which is the non-VVTi limit. -Ian Quote Link to comment Share on other sites More sharing options...
Alex Posted July 4, 2005 Share Posted July 4, 2005 Guess I should double check Terry's findings sometime...when I'm not driving Miss Daisy.. That article is great...I've got the best Turbo engine in the world Quote Link to comment Share on other sites More sharing options...
JohnA Posted July 5, 2005 Share Posted July 5, 2005 I've been a member of AutoSpeed from the beginning, and I've got all these articles in PDFs (they've now discontinued this practice and you can only access them online) It is copyrighted, very clearly. I also find it immoral to post their work, since the price of admission is so low. They deserve to have more people joining in, they're not a ripoff setup. That's why I've got no Autospeed articles on my site, most other material I see as a 'free game' since it originated by the manufacturers, or from expired magazine articles. It isn't exactly a technical article, more like a description, and as I said that extract contains the essense of that question. Quote Link to comment Share on other sites More sharing options...
Jake Posted July 5, 2005 Share Posted July 5, 2005 shame they got the redline wrong, it's 7200rpm as Terry has found out, not 6800 which is the non-VVTi limit. I think the red line is 6800rpm, or thereabouts. The rev limiter is higher. Quote Link to comment Share on other sites More sharing options...
Alex Posted July 5, 2005 Share Posted July 5, 2005 I think the red line is 6800rpm, or thereabouts. The rev limiter is higher. Nice, next time Ian will be saying a Porsche is mid engined not rear engined...but that you knew what he meant Quote Link to comment Share on other sites More sharing options...
JohnA Posted July 5, 2005 Share Posted July 5, 2005 I wonder if the 'members' area counts as public or not. What do the mods think? Maybe they could ask AutoSpeed if they agree for their 'Supra MKIV' PDFs (I've got five here) to be accessible to members here, in exchange for a banner or something. Fair deal perhaps, and an ad for Knowling's book won't go amiss, it's pretty good actually. What do you think? Quote Link to comment Share on other sites More sharing options...
Ian C Posted July 5, 2005 Share Posted July 5, 2005 I think the red line is 6800rpm, or thereabouts. The rev limiter is higher. So Toyota didn't change the gauge face, sue me -Ian Quote Link to comment Share on other sites More sharing options...
Pete Posted July 5, 2005 Share Posted July 5, 2005 I wonder if the 'members' area counts as public or not. What do the mods think? Maybe they could ask AutoSpeed if they agree for their 'Supra MKIV' PDFs (I've got five here) to be accessible to members here, in exchange for a banner or something. Fair deal perhaps, and an ad for Knowling's book won't go amiss, it's pretty good actually. What do you think? Sounds like a plan! Could be made available in the downloads area. Quote Link to comment Share on other sites More sharing options...
JohnA Posted July 5, 2005 Share Posted July 5, 2005 It's a good idea I think. Members here get more value, and AutoSpeed get some advertising, which is quite relevant as well (cheap, too). Don't know if it's Branners or the mods who can chase this up, but it may not even take more than a few emails to sort out. Straight swap perhaps. Quote Link to comment Share on other sites More sharing options...
Guest Terry S Posted July 5, 2005 Share Posted July 5, 2005 In the VVTI or normal? VVTi with the limit raised Quote Link to comment Share on other sites More sharing options...
Wez Posted July 5, 2005 Share Posted July 5, 2005 Are you running a motec or something then? Quote Link to comment Share on other sites More sharing options...
Guest Terry S Posted July 5, 2005 Share Posted July 5, 2005 Yeah it has a V Pro ish in it Quote Link to comment Share on other sites More sharing options...
Digsy Posted July 5, 2005 Share Posted July 5, 2005 Not to diss Terry and Migs' photographic expertise, but does anyone have any good quality photographs of the VVT-i valve block and the end of the intake camshaft? I'd like to take a closer look at them. Quote Link to comment Share on other sites More sharing options...
Guest Terry S Posted July 5, 2005 Share Posted July 5, 2005 sorry Darren they were taken with my phone Quote Link to comment Share on other sites More sharing options...
Alex Posted July 5, 2005 Share Posted July 5, 2005 sorry Darren they were taken with my phone I dunno half a bl00dy job! Quote Link to comment Share on other sites More sharing options...
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