spartan Posted June 25, 2008 Share Posted June 25, 2008 (edited) For what it's worth, my VVTi is more or less stock - just cat-back exhaust - and I don't get this problem and I'm currently using RON 97 (Total Excellium - it's my cheapest local source for Super Unleaded according to www.petrolprices.com). I do have a Greddy Informeter hooked up through the car's OBD-II port and, amongst other things, this will show real-time ignition advance. If you could observe that when you experience the det. would it help? Edited June 26, 2008 by spartan Updated petrol details (see edit history) Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted June 25, 2008 Share Posted June 25, 2008 It would be a VERY useful tool, for sure!! Quote Link to comment Share on other sites More sharing options...
spartan Posted June 26, 2008 Share Posted June 26, 2008 In that case, it might be even more useful to get hold of a Blitz R-Vit - it does the same kind of job as the Informeter but also reports OBD error codes (the Informeter can only display a count of how many error codes are stored). I think it can be hooked up to a DVD-style screen as well to make things a bit more readable (see this old thread New Blitz R-VIT DS). Quote Link to comment Share on other sites More sharing options...
nigelc Posted June 26, 2008 Share Posted June 26, 2008 When I had a decat and exhaust fitted to mine by Paul at Whifbitz, we had a similar sounding problem that took a while to track down. It turned out to be a faulty FCD, so it may be worth (assuming you have one fitted) checking your FCD. Mine was actually faulty, but bad fitting / soldering could also be a cause. Quote Link to comment Share on other sites More sharing options...
Guest [S]oLiD Posted June 27, 2008 Share Posted June 27, 2008 (edited) thanks for the help guys i dont have a FCD atm, the car is on stock boost levels... im hoping its not detonation but something else which sounds like it... how does the ecu react to detonation, does it cut the power or anything??? If it is knocking at 3000rpm, the ecu would pick it up and cut power or something wouldnt it??? Edited June 27, 2008 by [S]oLiD (see edit history) Quote Link to comment Share on other sites More sharing options...
foodfreak Posted June 27, 2008 Share Posted June 27, 2008 (edited) If it is det /knock the throttle will shut down, not as hard as fuel cut as a point of interest, Mark from Phoenix is moving out near perth I believe in august. so you guys will have someone who knows supras inside out over there soon Edited June 27, 2008 by foodfreak (see edit history) Quote Link to comment Share on other sites More sharing options...
Guest [S]oLiD Posted June 27, 2008 Share Posted June 27, 2008 (edited) hmmmm when it makes the sound the throttle keeps goin, it doesnt back down, mayb it isnt detonation... Is it possible for it to be detonationg and the ecu isnt picking it up??? Il have to get it on the dyno, check things out properly and find out for sure... The only problem is thats its random, some days it will do it, other days it wont.. however, it will only make it within the 2800-3000 rev range.. Mark's moving over to OZ ha, sounds good, welcome !! We got our fair share of supra Guru's over here, its just the VVti factor which complicates things, not much experience with them... Edited June 27, 2008 by [S]oLiD (see edit history) Quote Link to comment Share on other sites More sharing options...
foodfreak Posted June 27, 2008 Share Posted June 27, 2008 unless your knock sensor isn't working properly Mark's done quite a few vvti's.....Including Mine:) Quote Link to comment Share on other sites More sharing options...
Mike M Posted June 27, 2008 Share Posted June 27, 2008 Is there a possibilty of a faulty FPR causing this? Its ok once it gets the full boost pressure but is sticking slightly at lower pressures. Just the first thing that come into my head reading this. Quote Link to comment Share on other sites More sharing options...
foodfreak Posted June 27, 2008 Share Posted June 27, 2008 This could be something to look into. I believe Jake had an fpr problem that led to severe det, think that was a bad vacuum hose to the fpr. Jake?? Quote Link to comment Share on other sites More sharing options...
Mike M Posted June 27, 2008 Share Posted June 27, 2008 This could be something to look into. I believe Jake had an fpr problem that led to severe det, think that was a bad vacuum hose to the fpr. Jake?? If I remember right, Jake lost his engine through this after the vac Ref hose split or fell off. Poor B'astard. Quote Link to comment Share on other sites More sharing options...
Guest [S]oLiD Posted June 27, 2008 Share Posted June 27, 2008 Is there a possibilty of a faulty FPR causing this? Its ok once it gets the full boost pressure but is sticking slightly at lower pressures. Just the first thing that come into my head reading this. i thought about the fuel system but wouldnt it show up with the a/f ratios?? my cars runnin rich, starts off around 12 and drops to 10's at max boost, vvti's seem to run more rich than the others....... Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted June 27, 2008 Share Posted June 27, 2008 They all run rich, found 40 BHP more with an M800 and no cats over and above the gain from just removing the cats and leaving fuelling and timing untrimmed. Toyota had to run so rich to stop the catalytic converter substrates breaking up at the EGT's max power AFR's give. Quote Link to comment Share on other sites More sharing options...
spartan Posted June 27, 2008 Share Posted June 27, 2008 It's kind of ironic that Mr Toyota set the car up to run rich to preserve an item that was put there to deal with emissions created when, say, the car's running rich ... Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted June 27, 2008 Share Posted June 27, 2008 Oh, the other i found that certainly helped this odd problem was the VVTi actuator was seized up. Freeing it made the problem a lot better, but didn't cure it entirely. Quote Link to comment Share on other sites More sharing options...
Guest [S]oLiD Posted June 28, 2008 Share Posted June 28, 2008 cheers Chris, il check it out... Quote Link to comment Share on other sites More sharing options...
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