qaisar

same here, after a true 500 at the wheels with the ability to get that power down, personally i think thats more than for a road car. so should only need a small single hoping the tiptronic will be able to cope with that sort of power and also hopefully the cams will too

more interesting stuff on the thread at supraforums (hope this reposting is ok with the mods, but i think its about time there was some more info on VVTi's on this forum) BLKMGK (a knowlegable guy on AEM) "Okay, I pinged an AEM tech. Not only have they been working on VVT but it looks like it's pretty far along. A beta I'm using now apparently has some code in it already and it was developed for the WRX's tumble valve control. Control range looks to be pretty wide too! There appears to be some sort of closed loop feedback on this too. Not understanding the technology all that well I don't completely understand all that I'm reading but it's apparent that they are working pretty hard at this. Unfortunatly this is an internal design document not ready for release so I cannot share it but when this firmware goes production it looks like the code will be there and the instructions to back it up will be provided. " Also added by turbo97se "There is a VVT-i (AEM call VVC) map control in the AEM software. If you look hard enough you will find it. Lex is right about the valve control, there are many paramters that makes it impossible to tune and control with just the PWM. There is an option in AEM to have active feedback control. The PWM controls a solenoid valve which controls oil pressure which determines the amount of lift in the cam. Knowing where how much lift there is at any particular time is the key. The AEM does have the ability to do this. I will be playing with this in the next few months The Supra EMS is not necessarily the best EMS to run." BLKMGK "they are continuing to add new features to their existing EMS. They HAVE made some hardware changes to some platforms like an internal W/B driver on the EVO VIII boxes and the Viper box will be WAY different since it must live in the engine bay but overall no, same box with upgraded firmware. So far as I know this firmware will allow a Supra box to run VVT-i in some fashion. However I wouldn't run out and buy one until the firmware is released and this is confirmed by AEM. It appears to use more than one PWM and I'm not sure how that is done since I thought there was just the one spare. It's posisble they're doing some switching based on parameters ie you don't need a PWM meant for idle when not in the idle range but I'm NOT sure. clear as mud? Bottom line - this is not for a new box, this firmware is meant for the existing box and if what I'm seeing is correct will allow for variable valve control. I do not know if it will be what you need for the Toyota VVT-i, time will tell."

hes also said this "I should note you DO NOT need the HKS Valcon. The AEM will provide all the electronic control you need. I am curious about the cam that HKS offers. That may be something to have."

"Well I think I can answer the AEM question. It can be done, pretty easily actually. The VVTi system is controlled through PWM into a solenoid valve, which then modulates oil pressure to the pulley, which then effects the total amount of advance/retard of the intake cam. So electronically, it's just a PWM signal. The AEM has a valve timing output, that runs on PWM. Hook up one wire to the AEM, turn on the valve control, and tune it with the "Valve Map." That's it. No major hurdles to overcome." I personally have no idea what this means except the bit "it can be done pretty easily" forgot to add that guy is called AnArKey on supraforums and apparantly has quite abit of experience with AEM ecus

This guy, Lex Luthor, has apparantly tuned his own vvti car (not a supra i think) "my SC300 is so responsive and fast-revving with the VVT-i that even NA it would light the tyres up from a stop. My SC400 with a 4.0-litre V8 won't do that. My SP63 has a .81 A/R and still spools quicker than this turbo on a regular 2JZ running a smaller housing." "the stock VVT-i cams have been proven good to over 700 rwhp (again technically TT exhaust cam but this is almost identical)...this is about all most guys (even mkiv guys) would want in a street car, especially a daily driver, so in that application it's basically a non-issue. Since that is absolutely pushing the limits of what these cams can flow, when it comes time to upgrade you still have options and this should hopefully settle it. You can use a standard HKS or JUN grind on the exhaust side as we agree, for the intake cam if you are not happy with one of the two VVT-i grinds offered by HKS (I agree the lift issue will be of concern at some point, but that's got to be north of 800hp)...you can always have Brian regrind them to the Crower specs which are pretty close to the HKS 272 specs and made almost 1000rwhp in Ethan's SC300. Yes you'll have to use lash caps, but is that a good enough reason not to utilize the variable valve timing technology? Nope, not IMO. Again no one has addressed the two VVT-i cars I mentioned and their 'abnormal' performance. It's not a question of why it isn't commonly used, but how long it will be before it's mainstream."

I wasnt sure before because of the vvti specific downpipe needed, also with the accompanying problems like ecu and cams etc but heres an interesting quote from the thread "The GS300 that SP just finished (Sound, not Speed Pride) made 600 rwtq @ 22 lbs with a leeetle SP61GT on the VVT-i motor. That is absolutely freakish, and Lar attributes it to the variable valve timing."

and heres a pic of sp engineerings project car (lexus with 2jz-gte vvti transplant)

oh and in case anyone wants to readthe whole thread http://www.supraforums.com/forum/showthread.php?s=&threadid=180785&perpage=25&pagenumber=1

ok turns out they are blitz turbos and the car is a six speed manual vvti making 700bhp heres another pic

Found this on supraforums.com 2jz-gte VVT-i fully modified...A Reality... This picture proves that the old myth about not being able to modify a VVT-i 2jz motor is just that...This engine has an HKS GT2835 kit, and is fully built. How can this be? There is now new hope of importing these engines and modifying the hell out of them....

ah ok, thats cleared things up, cheers guys. was just a bit confused with the different terminology. yeah i have seen the 1st cat replacements for the vvti in a couple of places.

so does that mean they are different things? just that ive never seen anyone selling 'downpipes' in the uk only decat pipes 1 + 2 or in one piece. So are downpipes available for the vvti?

can someone tell me if the down pipes talked about on the US sites is the same as the 1st/front decat pipe?

Well looks are a personal thing and in my view they look good in that they are different from normal. But BigRoy seems to have experience with these sorts of discs and if they arent an improvement on OE and are in fact worse then theres no point.

Ive seen those for bikes before and were supposed to be quite effective, also saw them for cars and thought about getting a set, so would also like to know other peoples, such as CW's, views on them

I would say go with the Miami Rice ones and yes they are worth it in the long run

Can someone tell me how u sort out the difference in plugs, as they dont seem to match?

No mate, its a US car from supraforums that ive had photoshopped with a bonnet vent. Thats how my car was gonna look, but ive decided to go with a do-luck front instead of the c-west one, rest is the same though

i think it looks great except for the back end

for me too please, same areas

Darren was looking into this too, might be worth having a word with him

yep just got mine today off jdm_uk at what i think is the best price around as it was cheaper than all the prices quoted by Bobbeh. i think i got a bit of a mate rate though due to the amount of stuff ive bought off him. suggest u have a word with him to see what he can do, otherwise next best price was from gaz and kev

actually as ive got a vvti the motec ecu may be a better option although i have heard that some guys in the states have managed to get the aem to work with the vvti

oh well guess i wont bother then

i think my vote just puts veilside in the lead, cos ive got one