osso Posted July 4, 2004 Share Posted July 4, 2004 I have got a RSR Exhaust and a two piece decat pipe (using 3 inch piping) waiting to go on my supra. I have heard rumours that the VVTi doesnt seem to suffer from boost creep like the none vvti jspec, and therefore I shouldnt need a restrictor ring? is anyone on this list able to confirm this? if this is the case, will i need a boost controller to up the boost beyond 0.85 bar (standard) to 1.25 bar? Regards James Link to comment Share on other sites More sharing options...
Nick Posted July 4, 2004 Share Posted July 4, 2004 Without the restrictor ring mine boosts to around 1.4bar, no need for a boost controller unless you want to play. Link to comment Share on other sites More sharing options...
osso Posted July 4, 2004 Author Share Posted July 4, 2004 Interesting, do you run at 1.4 bar then or restrict it down to 1.2 bar? I'd be interested to hear what mods you are running on.. Link to comment Share on other sites More sharing options...
Gripweed Posted July 4, 2004 Share Posted July 4, 2004 Had the second cat out in mine for a while and have just replaced the first cat with a pipe and restictor ring from Paul Whiffin, been out for a spirited drive today up the M4 and am getting slight overboost in 6th gear only. Just gotta play about with the boost controller a bit now to try and eliminate it. Course, the best thing about having boths cats out is I now get massive flames out the exhuast!! Link to comment Share on other sites More sharing options...
Alex Posted July 4, 2004 Share Posted July 4, 2004 Nick, is yours with CW 2.5" Decat pipes?? Only Osso has 3" pipework which WILL make a difference. I personally would expect you to over boost with a 3" decat on ANY j-spec as I don't believe the later j's had a bigger/better wastegate. Link to comment Share on other sites More sharing options...
Nick Posted July 4, 2004 Share Posted July 4, 2004 The ring limits it to 1.2bar, I also have a HKS R-Type FMIC and water injection. Other mods are listed on my webpage (link below) When I had the boost controller removed I took it for a blast to see how much it'd make and had the ring fitted shortly after. I've got a HKS decat pipe and a fabricated second pipe. Link to comment Share on other sites More sharing options...
Lewis Posted July 4, 2004 Share Posted July 4, 2004 Originally posted by Nick The ring limits it to 1.2bar, I also have a HKS R-Type FMIC and water injection. Other mods are listed on my webpage (link below) When I had the boost controller removed I took it for a blast to see how much it'd make and had the ring fitted shortly after. I've got a HKS decat pipe and a fabricated second pipe. Would a gnats bollock get trapped between your caliper and inner wheel rim? Lovely car mate. /end hijack Link to comment Share on other sites More sharing options...
Nick Posted July 4, 2004 Share Posted July 4, 2004 Originally posted by stealthhosts Would a gnats bollock get trapped between your caliper and inner wheel rim? Lovely car mate. /end hijack Thanks. Don't know what you mean, there's loads of space;) Link to comment Share on other sites More sharing options...
Dragonball Posted July 4, 2004 Share Posted July 4, 2004 Originally posted by osso I have got a RSR Exhaust and a two piece decat pipe (using 3 inch piping) waiting to go on my supra. B] Is that STILL waiting to go on?? When you doing it as I could use the RSR m8? Listen to Alex on this one - makes sense:thumbs: Link to comment Share on other sites More sharing options...
Lewis Posted July 4, 2004 Share Posted July 4, 2004 Originally posted by Nick Thanks. Don't know what you mean, there's loads of space;) Lol - it was this pic: http://www.angelfire.com/ultra/nickmartin/Supra/Supra6.jpg That got me worried - looks like loads of space in the others - lovely brake setup (although I feel the need to call it a "break" - just so the usual writers of the word know what I am talking about). Link to comment Share on other sites More sharing options...
osso Posted July 4, 2004 Author Share Posted July 4, 2004 The RSR has been gathering dust for months! better be worth it when it eventually goes on my cursed soop this week hopefully! Just waiting for dude to fit me in Sounds like i will need a restrictor ring now... Link to comment Share on other sites More sharing options...
Guest Terry S Posted July 4, 2004 Share Posted July 4, 2004 James as we discussed the VVTi's don't seem to over boost as much as the normal J spec. Give it a go and see what you get ( obviously keeping an eye on it!) I don't like the restrictor rings, but they do work. Link to comment Share on other sites More sharing options...
osso Posted July 4, 2004 Author Share Posted July 4, 2004 I would be concerned if my boost jumps to 1.4 ~ 1.5 bar once both cats are removed, with the setup i've got and with the luck i've been having lately! Nick who also has a VVTi had to use a restrictor ring to bring the boost down to 1.2 bar.. Link to comment Share on other sites More sharing options...
Nick Posted July 5, 2004 Share Posted July 5, 2004 I found that without the ring it would over boost when holding WOT in 4th gear and up and I had to constantly keep an eye on the gauge. Problem with the ring is it can take a couple of goes to get the desired boost as no two cars are identical. First time round it made 1bar, then after 5 minutes with a file it made 1.2. Easy enough and a lot cheaper and more reliable than a boost controller, well the AVCR at least. Stealth - I know, it's a *very* close fit but they've been on a while and any problems would have been apparent by now. I was very relieved when I found they did clear ok, and very happy when I press the brake pedal :) Link to comment Share on other sites More sharing options...
Guest Terry S Posted July 5, 2004 Share Posted July 5, 2004 James it will depend on lots of things mate. I have spoken to Dude about it, and we have a plan (ish) BTW, does the RSR have a removal baffle like the the Nur? Link to comment Share on other sites More sharing options...
osso Posted July 5, 2004 Author Share Posted July 5, 2004 The RSR does indeed have a removal baffle Would you mind sending me a PM on this plan of yours, cuz at the end of the day, i do not want to be running my car beyond 1.25 bar. Cheers James Link to comment Share on other sites More sharing options...
roboldham Posted July 6, 2004 Share Posted July 6, 2004 I have a VVTi Tipto - and 3" decats into a Nur Spec. It does not boost past around 1.05 ish and does not creep - nice and stable, no nasty nasty ring - so I use a Blitz SBC-ID to run 1.25 /1.3 with no det. R Link to comment Share on other sites More sharing options...
osso Posted July 6, 2004 Author Share Posted July 6, 2004 somebody must be talking out their arse then! Link to comment Share on other sites More sharing options...
Guest Terry S Posted July 6, 2004 Share Posted July 6, 2004 Not really James, cars all behave differently, that is why I said try it. I will send you an e-mail on the "plan". Link to comment Share on other sites More sharing options...
ChrisR Posted July 6, 2004 Share Posted July 6, 2004 Originally posted by osso somebody must be talking out their arse then! osso, im sure you have seen this already however just in case. Doesnt specifically talk about VVTI's but some good info on overboosting. Restrictor Rings Link to comment Share on other sites More sharing options...
Darren Posted July 16, 2004 Share Posted July 16, 2004 Osso how did you get on? I'm running a full decat too and suffer NO boost creep. Link to comment Share on other sites More sharing options...
osso Posted July 16, 2004 Author Share Posted July 16, 2004 I will find out on sunday hopefully What boost are you running at Darren? are you using a boost controller as well? Link to comment Share on other sites More sharing options...
roboldham Posted July 16, 2004 Share Posted July 16, 2004 I run 1.25, sometimes 1.3 on a good day no det, no creep. R Link to comment Share on other sites More sharing options...
Grazer Posted July 16, 2004 Share Posted July 16, 2004 Originally posted by osso if this is the case, will i need a boost controller to up the boost beyond 0.85 bar (standard) to 1.25 bar? Am I right in thinking that a boost controller can't up the boost like this or have I got that wrong? Link to comment Share on other sites More sharing options...
Darren Posted July 16, 2004 Share Posted July 16, 2004 Originally posted by osso I will find out on sunday hopefully What boost are you running at Darren? are you using a boost controller as well? Yes mate I'm running a boost controller @ 1.3/4 bar but I do have hybrids/550 injectors/S-AFC etc on the car. Link to comment Share on other sites More sharing options...
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