Guest johnmcleod Posted August 5, 2012 Share Posted August 5, 2012 Ive got a 93 supra NA and im planning to turbo it. due to pretty high mileage i thought a new engine would be a smart idea before boosting. i found on ebay that 2jz ge engines are only £250-600 but they are VVTI. would i be better with a VVTI engine or just rebuild the one i have? thanks Quote Link to comment Share on other sites More sharing options...
Geo Posted August 5, 2012 Share Posted August 5, 2012 id say so yes, far as im away the VVT-i is more low down power over the non vvt-i well thats on the turbo version, imo id say yes Quote Link to comment Share on other sites More sharing options...
Guest johnmcleod Posted August 5, 2012 Share Posted August 5, 2012 would i need a different ecu ? same engine code but different engine... Quote Link to comment Share on other sites More sharing options...
46 Posted August 5, 2012 Share Posted August 5, 2012 would i need a different ecu ? same engine code but different engine... I'd say no, should you want more power in the future the vvti's are restrictive and you'll be getting rid of the head and going non vvti. Also the Fly by wire is a ball ache. Quote Link to comment Share on other sites More sharing options...
Kirk Posted August 5, 2012 Share Posted August 5, 2012 (edited) I'd say no, should you want more power in the future the vvti's are restrictive and you'll be getting rid of the head and going non vvti. Also the Fly by wire is a ball ache. would i need a different ecu ? same engine code but different engine... Yes you will need a VVT-i ecu to run a VVT-i engine. Edited August 5, 2012 by Kirk (see edit history) Quote Link to comment Share on other sites More sharing options...
46 Posted August 5, 2012 Share Posted August 5, 2012 If you want a full list of technical differences have a look here: - http://www.supraforums.com/forum/showthread.php?522377-FAQ-VVTi-2JZGTE-Facts-differences-and-conversion-information Quote Link to comment Share on other sites More sharing options...
Guest johnmcleod Posted August 5, 2012 Share Posted August 5, 2012 may be better just sticking to the one i have and rebuild it with lower compression. another question if you guys dont mind, would forge pistons made for a 2jzgte fit into my 2jzge ? Quote Link to comment Share on other sites More sharing options...
Kirk Posted August 5, 2012 Share Posted August 5, 2012 Yes. Quote Link to comment Share on other sites More sharing options...
Guest johnmcleod Posted August 5, 2012 Share Posted August 5, 2012 Yes. thanks Quote Link to comment Share on other sites More sharing options...
ashbuster Posted August 5, 2012 Share Posted August 5, 2012 I'd say no, should you want more power in the future the vvti's are restrictive and you'll be getting rid of the head and going non vvti. Also the Fly by wire is a ball ache. thats why i didnt go for a vvti Quote Link to comment Share on other sites More sharing options...
johnny g Posted August 5, 2012 Share Posted August 5, 2012 Nothing wrong with a well executed VVT-i install. Quote Link to comment Share on other sites More sharing options...
sdistc Posted August 5, 2012 Share Posted August 5, 2012 I'd say no, should you want more power in the future the vvti's are restrictive and you'll be getting rid of the head and going non vvti. Also the Fly by wire is a ball ache. Sorry, but your information is wrong (apart from FBW being difficult). There is very little real-world data supporting the hypothesis that the VVTi rods are weak, or the head is restrictive. I have a stock VVTi head, bar a upgraded exhaust cam, and it has flowed over 800 wheel hp. Quote Link to comment Share on other sites More sharing options...
Kirk Posted August 5, 2012 Share Posted August 5, 2012 The rods on the GE VVT-i are weaker and thinner but the GTE's share the same rods. Quote Link to comment Share on other sites More sharing options...
46 Posted August 5, 2012 Share Posted August 5, 2012 Sorry, but your information is wrong (apart from FBW being difficult). There is very little real-world data supporting the hypothesis that the VVTi rods are weak, or the head is restrictive. I have a stock VVTi head, bar a upgraded exhaust cam, and it has flowed over 800 wheel hp. Sorry but my information is correct! Quote Link to comment Share on other sites More sharing options...
Kirk Posted August 5, 2012 Share Posted August 5, 2012 Dont be shy.... Quote Link to comment Share on other sites More sharing options...
sdistc Posted August 6, 2012 Share Posted August 6, 2012 Sorry but my information is correct! Care to share head flow figures, dyno figures, or indeed *any* information to support your assertions? Sorry if I'm not in a trusting mood, given your extensive reputation on this forum. Quote Link to comment Share on other sites More sharing options...
46 Posted August 6, 2012 Share Posted August 6, 2012 Care to share head flow figures, dyno figures, or indeed *any* information to support your assertions? Sorry if I'm not in a trusting mood, given your extensive reputation on this forum. i'll gladly try and dig out all the information i have on the flow differences, I own a vvti 1999 TT so did lots of research many moons ago. As for my extensive reputation? would you care to elaborate? If you're referring to a certain white car I can gladly discuss this with you via phone but not openly on here due to legal reasons, happy to supply my number via pm. Nick. Quote Link to comment Share on other sites More sharing options...
46 Posted August 6, 2012 Share Posted August 6, 2012 Also please see my old account feedback here: http://www.mkivsupra.net/vbb/member.php?4250-Nicholas I had one sale go wrong, I haven't been on the forum for a year or so hence the new username. Quote Link to comment Share on other sites More sharing options...
straightsix Posted August 6, 2012 Share Posted August 6, 2012 While you're at it - you might explain how a non VVTi ECU can run a VVTi engine..... Quote Link to comment Share on other sites More sharing options...
46 Posted August 6, 2012 Share Posted August 6, 2012 (edited) While you're at it - you might explain how a non VVTi ECU can run a VVTi engine..... it can't, where did I say it could? Straightsix - I quoted the wrong post by Johnmcleod, my first reply was to his original engine question not the ECU, its common sense that the non VVTI ECU can't run a VVTI engine. Edited August 6, 2012 by 46 (see edit history) Quote Link to comment Share on other sites More sharing options...
ashbuster Posted August 6, 2012 Share Posted August 6, 2012 ive read it somewhere else too so hes not making it up himself Quote Link to comment Share on other sites More sharing options...
46 Posted August 6, 2012 Share Posted August 6, 2012 I'm trying to find the info but god knows what backed up HD it's on, I am going on my build research from 2008 so advances with the VVTI head may well have happened, my original build thread is here: http://www.mkivsupra.net/vbb/showthread.php?154236-Project-quot-Quicksilver-quot-Supra Again I'm not shouting fiction it's facts from research and I certainly don't want to start a slagging match, to be honest i'm wishing I'd never replied to the thread. If I can find the info I'll post it up, I believe it was figures from headworx in the US. Quote Link to comment Share on other sites More sharing options...
straightsix Posted August 6, 2012 Share Posted August 6, 2012 would i need a different ecu ? same engine code but different engine... I'd say no, should you want more power in the future the vvti's are restrictive and you'll be getting rid of the head and going non vvti. Also the Fly by wire is a ball ache. Confused..... Quote Link to comment Share on other sites More sharing options...
46 Posted August 6, 2012 Share Posted August 6, 2012 Confused..... Look at post no.20 Quote Link to comment Share on other sites More sharing options...
wewsupra Posted August 6, 2012 Share Posted August 6, 2012 (edited) ive just put a vvti in my car as i blew up the normal twin turbo had a few little problems with the maf ,when putting engine in but omg as standard its miles better then the non vvti Torque is a lot better imo heres some info i found on here PRO's ECU. The VVTi has 2 x 16 bit whilst the stock JDM is 2 x 8 bit. The ecu is obviously much faster. It is based upon the later Lexus units and is very powerful. Fly-By-Wire. In conjunction with the ECU the FBY system will close the throttle if it senses detonation, high coolant temps, etc The VVTi system. Adjusts the intake cam timing. This gives significantly more low end torque, and helps the larger turbo'd car spool earlier. Rev Limit. The rev limit on a stock VVTi is 7200 rpm whilst the Stock JDM is 6800 rpm. Neutral MAF. The VVTi uses MAF, The MAF is far more accurate than a speed density system. The downside is that the MAF will eventually become a restriction if big power is required. AFTERMARKET ecu to by pass the maf neil from derby has done this Inlet. The VVTi uses a smaller inlet manifold. This will improve torque, but may become a retriction on really big power cars ( 650+ bhp) Cons Wasted Spark ignition. This IMO is a step backwards to coil on plug. Trac. The VVTi TRAC is too over-sensitive. Pulling the fuse will put the car into "snow" mode. (i have not got ) Engine Mounts. This applies to all Facelift cars. TMC changed the engine mounts for some strange reason. These are prone to failure and are not as "beefy" as those on earlier cars. (ive used my old twin turbo engine mount so again this is a problem i have not got ) edit got this from the search button i did not write this lol but as said my vvti standard is miles better then the non vvti i had befor Edited August 6, 2012 by wewsupra (see edit history) Quote Link to comment Share on other sites More sharing options...
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