foodfreak Posted September 12, 2006 Share Posted September 12, 2006 I think Rob Oldham's old car VVTi Tiptronic made just over 400 at the flywheel with just a double de-cat & decent exhaust.Not sure what plugs he was running. You WILL need a restrictor ring for sure........some vvti's have hit 1.4-1.5 bar without one John Quote Link to comment Share on other sites More sharing options...
Darren Posted September 12, 2006 Share Posted September 12, 2006 this makes for excellent reading - I was always under the impression that I'd get a newer facelift vvti engine to modify, but from this it seems like the wrong thing to do - so i'll just buy a little older and have a mod-friendly car VVTi are not harder mod than older Supras. And respond better to BPU than older Supras. This rumour started because when they first appeared no one new how to wire up an FCD on them as it wasn't the same as older models... As mentioned Rob's made 400bhp with double decat and boost controller @ 1.2bar. That was significally more than same specc'd non VVTi's made the same day. Mine made 390 bhp with both CATS in @ 1.2 bar... People who've driven both say the VVTi is more repsonsive and a better drive.... Quote Link to comment Share on other sites More sharing options...
Pabs Posted September 12, 2006 Share Posted September 12, 2006 VVTi are not harder mod than older Supras. And respond better to BPU than older Supras. This rumour started because when they first appeared no one new how to wire up an FCD on them as it wasn't the same as older models... As mentioned Rob's made 400bhp with double decat and boost controller @ 1.2bar. That was significally more than same specc'd non VVTi's made the same day. Mine made 390 bhp with both CATS in @ 1.2 bar... People who've driven both say the VVTi is more repsonsive and a better drive.... so a vvti supra will be as easy/same price to get to the higher power levels, like 500bhp? Just from reading, it seems the vvti's need ecu swaps/mods? Quote Link to comment Share on other sites More sharing options...
Guest Saxo Boy Posted September 12, 2006 Share Posted September 12, 2006 So we've gone full circle and we are not back at: fit full decat with restrictor, use boost controller to limit boost to 1.2bar, use FCD to overcome fuel-cut and hey-presto circa 400bhp That I could live with Incidently would a 400bhp walk the likes of an e46 M3? Quote Link to comment Share on other sites More sharing options...
Darren Posted September 12, 2006 Share Posted September 12, 2006 so a vvti supra will be as easy/same price to get to the higher power levels, like 500bhp? Just from reading, it seems the vvti's need ecu swaps/mods? LOL! Well what are you expecting to have to do to an older Supra to get it to a REAL 500bhp? Because realistically you need to go single for that... Quote Link to comment Share on other sites More sharing options...
Thorin Posted September 12, 2006 Share Posted September 12, 2006 So we've gone full circle and we are not back at: fit full decat with restrictor, use boost controller to limit boost to 1.2bar, use FCD to overcome fuel-cut and hey-presto circa 400bhp That I could live with Incidently would a 400bhp walk the likes of an e46 M3? You don't need a boost controller. Removing the restriction of the cats causes J-spec's to overboost (1.4-1.5+ is not uncommon), the restrictor ring limits that back down to 1.2. UK spec's are different and require a boost controller to raise the boost. Other than that, some colder plugs. Quote Link to comment Share on other sites More sharing options...
Ewen Posted September 12, 2006 Share Posted September 12, 2006 320 stock bhp quoted twice, no flames.....interesting:) Quote Link to comment Share on other sites More sharing options...
Darren Posted September 12, 2006 Share Posted September 12, 2006 So we've gone full circle and we are not back at: fit full decat with restrictor, use boost controller to limit boost to 1.2bar, use FCD to overcome fuel-cut and hey-presto circa 400bhp That I could live with Incidently would a 400bhp walk the likes of an e46 M3? VVTis dont need restrictor rings.....and Boost controllers up boost not limit it!! So: FCD, Exhaust, Double decat, Boost controller and cheap NGK colder plugs and fuel pump. They go very well on this spec and after this modding gets expensive for what you get back IMHO Quote Link to comment Share on other sites More sharing options...
Darren Posted September 12, 2006 Share Posted September 12, 2006 You don't need a boost controller. Removing the restriction of the cats causes J-spec's to overboost (1.4-1.5+ is not uncommon), the restrictor ring limits that back down to 1.2. UK spec's are different and require a boost controller to raise the boost. Other than that, some colder plugs. Not true with VVTis they are same as UK they dont overboost.. Quote Link to comment Share on other sites More sharing options...
Thorin Posted September 12, 2006 Share Posted September 12, 2006 VVTis dont need restrictor rings... See that's what I wasn't sure of when I first posted, but then people started mentioning restrictor rings Quote Link to comment Share on other sites More sharing options...
Darren Posted September 12, 2006 Share Posted September 12, 2006 320 stock bhp quoted twice, no flames.....interesting:) True for VVTi's ! And excellent torque too! Quote Link to comment Share on other sites More sharing options...
Ewen Posted September 12, 2006 Share Posted September 12, 2006 True for VVTi's ! And excellent torque too! I reserve the right to withold my:d until I dont need to crawl along cautiously keeping one eye out for the nearest lay-by and my crawl-by-wire throttle starts behaving itself Quote Link to comment Share on other sites More sharing options...
Guest Saxo Boy Posted September 12, 2006 Share Posted September 12, 2006 So for the power alone (with zero regard to monitoring). We need cat 1 replaced; cat 2 replaced; cat-back exhaust system; FCD; boost controller (electronic I presume); plugs and fuel pump. Well, all that sounds quite reasonable Quote Link to comment Share on other sites More sharing options...
Pete Posted September 12, 2006 Share Posted September 12, 2006 VVTis dont need restrictor rings... Oh yes they bloody do! You don't need a boost controller. Only reason to fit one is to raise boost (they cannot lower boost). You do not want to run boost over 1.2 on stock tubbies, the restricter ring sorts that. If you're interested in longevity then I suggest a 1bar restricter ring for normal driving, then a boost controller to up to 1.2 when you want some fun. I drive like miss daisy most of the time and don't approach 1.2 bar very often so I'm not worried about restricting to 1 bar. Quote Link to comment Share on other sites More sharing options...
Darren Posted September 12, 2006 Share Posted September 12, 2006 Oh yes they bloody do! I dont have one And others on here have confirmed they dont either.....Did yours overboost then? Quote Link to comment Share on other sites More sharing options...
Darren Posted September 12, 2006 Share Posted September 12, 2006 So for the power alone (with zero regard to monitoring). We need cat 1 replaced; cat 2 replaced; cat-back exhaust system; FCD; boost controller (electronic I presume); plugs and fuel pump. Well, all that sounds quite reasonable A good boost controller will have a boost gauge built in so thats a good start for monitoring... Quote Link to comment Share on other sites More sharing options...
Guest Saxo Boy Posted September 12, 2006 Share Posted September 12, 2006 Hmmm, the ring vs controller issue seems unresolved here 1 bar seems pretty lame when you are trying to secure some extra horsepower. Is it not .9 bar standard? For my purposes the car would largely be a weekend/evening toy that I'd take out for a 30 mile blat now and then so I'd probably want some return on my money in terms of the grin factor Quote Link to comment Share on other sites More sharing options...
Pete Posted September 12, 2006 Share Posted September 12, 2006 Hmmm, the ring vs controller issue seems unresolved here 1 bar seems pretty lame when you are trying to secure some extra horsepower. Is it not .9 bar standard? For my purposes the car would largely be a weekend/evening toy that I'd take out for a 30 mile blat now and then so I'd probably want some return on my money in terms of the grin factor I think you misunderstood. Some guys like to limit to 1 bar mechanically (the ring) to remain more like stock and keep reliable, but then use the electronics to override to 1.2 bar if they want some fun. Quote Link to comment Share on other sites More sharing options...
Pete Posted September 12, 2006 Share Posted September 12, 2006 I dont have one And others on here have confirmed they dont either.....Did yours overboost then? I'm certain it would do, I wasn't going to risk it. With the ring it stops nicely right on 1.2 bar which will do nicely. Quote Link to comment Share on other sites More sharing options...
Darren Posted September 12, 2006 Share Posted September 12, 2006 Hmmm, the ring vs controller issue seems unresolved here 1 bar seems pretty lame when you are trying to secure some extra horsepower. Is it not .9 bar standard? For my purposes the car would largely be a weekend/evening toy that I'd take out for a 30 mile blat now and then so I'd probably want some return on my money in terms of the grin factor Pretty lame!! Drive a 400bhp rear wheel drive car and come back and say that!! Quote Link to comment Share on other sites More sharing options...
Darren Posted September 12, 2006 Share Posted September 12, 2006 I'm certain it would do, I wasn't going to risk it. With the ring it stops nicely right on 1.2 bar which will do nicely. So you dont run a boost controller? Quote Link to comment Share on other sites More sharing options...
Pete Posted September 12, 2006 Share Posted September 12, 2006 So you dont run a boost controller? Why would I run a boost controller if I have a 1.2 ring? I'm not going to boost it over 1.2 as long term that won't be good. Quote Link to comment Share on other sites More sharing options...
Darren Posted September 12, 2006 Share Posted September 12, 2006 Why would I run a boost controller if I have a 1.2 ring? I'm not going to boost it over 1.2 as long term that won't be good. Ok calm down I just asking what your exact setup was as my car does not suffer from boost creep and yours does Quote Link to comment Share on other sites More sharing options...
Pete Posted September 12, 2006 Share Posted September 12, 2006 Ok calm down I just asking what your exact setup was as my car does not suffer from boost creep and yours does LOL - I'm So you have no ring? Quote Link to comment Share on other sites More sharing options...
Guest Saxo Boy Posted September 12, 2006 Share Posted September 12, 2006 So with a 1.2 ring will the boost hit a maximum of 1.2 and no more or would it be prone to spikes where problems (pre-detonation I'd guess) could occur? Quote Link to comment Share on other sites More sharing options...
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