1JZ-VVTi output limit - 260-280kw it seems =|

[jdm93]

I've been reading up, searching, trolling whatever you'd like to call it - for past few weeks now and it seems that people aren't able to extract 300+kw from 1jz vvtis? (real kw that is , put down on the quarter to back up with figures not just some dyno figure alone..)

views, opinions on the matter? port sizing? spacing? rods? what exactly limiting factor the non vvti 1j seems to do quite well... so why did they stuff up on the later one ..

here's my planned turbo to go on in a few months (for a 1jz vvti donk)

http://www.atpturbo.com/mm5/merchant...Category_Code=

[joey]

I know of a few jzx100's that are putting down 300kw+ but also know of one that is making around 280kw and can put down a mid 11 down the strip, it seems that obviously the vvti is the limiting factor. Reading (more like picture browsing) some jap mags it looks like they are able to extract atleast 40+kw more when tuning the vvti in an aftermarket application with something like a vmanage, not many aussie tuners know how to properly tune/incorporate the vvti from what ive heard but im not 100% sure on the ins and outs of it all abd would be interesting to hear other peoples opinions.

[mr1jz]

My personal experience.

I have tuned a 1JZ VVTi with a GT35/40 and Power FC and it made 330rwkw.
The package was is in a E30 318i BMW with a R154. Lots of fun.

[Shakotan_Aaron]

I
here's my planned turbo to go on in a few months (for a 1jz vvti donk)

http://www.atpturbo.com/mm5/merchant...Category_Code=

geezus they seem cheap!!??i thought garretts where around $1500-$1800

[mr1jz]

The Garrett BB's are those prices. This is a journal bearing with oil cooling only.

[mxracer92]

My personal experience.

I have tuned a 1JZ VVTi with a GT35/40 and Power FC and it made 330rwkw.
The package was is in a E30 318i BMW with a R154. Lots of fun.

bloke here in WA has same setup , best he could get was 335 rwhp at 18psi ( throu auto and 3.5k stall ) but laid down an 11.8

yes seems to be a struggle to crack 300rwkw with vvti 's

i did it years ago with a non vvti with a gt30.

[mr1jz]

Yeah okay. The auto is going to suck a fair amount of rear wheel power but the time seems to be pretty evident of the power.

[1JZ-Rolla]

whatthe on here had one in his IS200 that had no problem putting down 295wkw day after day (as good as 300kw lets call it) as his daily driver, and track thrasher.

Are we talking about simply not being able to get past some sort of power threshold (i.e: no matter what you do, power is limited to 280wkw) or that past this power level they fail mechanically (rods etc)?

[jdm93]

whatthe on here had one in his IS200 that had no problem putting down 295wkw day after day (as good as 300kw lets call it) as his daily driver, and track thrasher.

Are we talking about simply not being able to get past some sort of power threshold (i.e: no matter what you do, power is limited to 280wkw) or that past this power level they fail mechanically (rods etc)?

that and been advised on an auto past that more than likely to blow a rod.. :S

[-GT-]

Sorry, how does having an auto increase the risk of blowing a rod?

Are we really suggesting there's some unavoidable wall in the development of these engines? Or just maybe 300+rwkw vvti's aren't seen as often (we've already had a couple of examples), and that it's probably due to the difference in price and availability until more recently?

Based on nothing more than the above comments, if there is a threshold there it's likely due to flow through the factory setup (cams, ports) and the significantly increased cost for management, cams and proper tuning in the vvti when compared to how cheaply and easily you can do it with the non-vvti. How far above that level are most non-vvti's on the factory cams?

It's likely just a natural step in the modification process; easy to get to and then the mods required step up after that. Almost anything can be achieved with enough money and know-how.

[Shakotan_Aaron]

The Garrett BB's are those prices. This is a journal bearing with oil cooling only.

ooohh... is there really double difference? perhaps a bit shorter service life and slightly worse response yeah?

[Indelible]

think what he meant about breaking a rod is with an auto to get 300kw at the wheels it takes alot more engine kw than manual so higher risk of engine damage ,

[TAKUSHI]

Sorry bout continuing this but i knew id found a 1jz vvti thats pushin 500hp, right here in perth too 8)
http://www.c-red.com.au/magazines/c-pink-v2/

[ecko]

only barrier is a wallet capacity related issue

[Fantapants]

fwiu its in the flow properties of the head.

the vvti heads are designed around great response from factory for a lively and torquey engine.

Everything is based around fast flow and air speed. So when you start throwing more amounts of boost in, its simply strangled. It can be got past, but its not as efficient as the earlier heads or the 2j heads at these sort of flow figures.